release v0.20.2

output/Thread: reconfigure ConvertFilter for its new input AudioFormat
If the input AudioFormat changes but the out_audio_format doesn't change (e.g. because there is a fixed "format" setting in this "audio_output" section), the ConvertFilter needs to be reconfigured. This didn't happen, resulting in awful static noise after changing songs.
2017-01-15 01:28:00 +01:00 · 2017-01-15 01:24:17 +01:00 · 2017-01-15 01:23:49 +01:00 · 2017-01-15 01:21:14 +01:00 · 2017-01-15 00:58:49 +01:00 · 2017-01-15 00:54:25 +01:00
1215 changed files with 44757 additions and 31389 deletions
--- a/.gitignore
+++ b/.gitignore
@@ -35,7 +35,8 @@ tags
 /mkinstalldirs
 /build
 /src/mpd
-/systemd/mpd.service
+/systemd/system/mpd.service
+/systemd/user/mpd.service
 /stamp-h1

 /src/dsd2pcm/dsd2pcm
@@ -77,7 +78,11 @@ tags
 /test/test_vorbis_encoder
 /test/DumpDatabase

+/lib/
+
 /*.tar.gz
 /*.tar.bz2
 /*.tar.xz
 /mpd-*/
+
+__pycache__/
--- a/3
+++ b/3
@@ -1,5 +1,5 @@
 Music Player Daemon - http://www.musicpd.org
-Copyright (C) 2003-2014 The Music Player Daemon Project
+Copyright 2003-2017 The Music Player Daemon Project

 The following people have contributed code to MPD:

@@ -29,3 +29,4 @@ The following people have contributed code to MPD:
 Denis Krjuchkov <denis@crazydev.net>
 Jurgen Kramer <gtmkramer@xs4all.nl>
 Jean-Francois Dockes <jf@dockes.org>
+ Yue Wang <yuleopen@gmail.com>
--- a/8
+++ b/8
@@ -12,15 +12,12 @@ install MPD.  If more information is desired, read the user manual:
 Dependencies
 ------------

-gcc 4.6 or later - http://gcc.gnu.org/
+gcc 4.7 or later - http://gcc.gnu.org/
 clang 3.2 or later - http://clang.llvm.org/
 Any other C++11 compliant compiler should also work.

 Boost 1.46 - http://www.boost.org/

-GLib 2.28 - http://www.gtk.org/
-General-purpose utility library.
-

 Optional Output Dependencies
 ----------------------------
@@ -116,9 +113,6 @@ For WavPack playback.
 libadplug - http://adplug.sourceforge.net/
 For AdLib playback.

-despotify - https://github.com/SimonKagstrom/despotify
-For Spotify playback.
-

 Optional Miscellaneous Dependencies
 -----------------------------------
--- a/Makefile.am
+++ b/Makefile.am
--- a/275
+++ b/275
@@ -1,3 +1,259 @@
+ver 0.20.2 (2017/01/15)
+* input
+  - alsa: fix crash bug
+  - alsa: fix buffer overruns
+* decoder
+  - flac: add options "probesize" and "analyzeduration"
+* resampler
+  - libsamplerate: reset state after seeking
+* output
+  - fix static noise after changing to a different audio format
+  - alsa: fix the DSD_U32 sample rate
+  - alsa: fix the DSD_U32 byte order
+  - alsa: support DSD_U16
+  - recorder: fix error "Failed to create : No such file or directory"
+* playlist
+  - cue: fix skipping songs
+
+ver 0.20.1 (2017/01/09)
+* input
+  - curl: fix crash bug
+  - curl: fix freeze bug
+* decoder
+  - wavpack: fix crash bug
+* storage
+  - curl: new storage plugin for WebDAV (work in progress)
+* mixer
+  - alsa: normalize displayed volume according to human perception
+* fix crash with volume_normalization enabled
+
+ver 0.20 (2017/01/04)
+* protocol
+  - "commands" returns playlist commands only if playlist_directory configured
+  - "search"/"find" have a "window" parameter
+  - report song duration with milliseconds precision
+  - "sticker find" can match sticker values
+  - drop the "file:///" prefix for absolute file paths
+  - add range parameter to command "plchanges" and "plchangesposid"
+  - send verbose error message to client
+* input
+  - curl: fix memory leak
+* tags
+  - ape, ogg: drop support for non-standard tag "album artist"
+    affected filetypes: vorbis, flac, opus & all files with ape2 tags
+    (most importantly some mp3s)
+  - id3: remove the "id3v1_encoding" setting; by definition, all ID3v1 tags
+    are ISO-Latin-1
+  - ape: support APE replay gain on remote files
+  - read ID3 tags from NFS/SMB
+* decoder
+  - improved error logging
+  - report I/O errors to clients
+  - ffmpeg: support ReplayGain and MixRamp
+  - ffmpeg: support stream tags
+  - gme: add option "accuracy"
+  - gme: provide the TRACK tag
+  - gme: faster scanning
+  - mad: reduce memory usage while scanning tags
+  - mpcdec: read the bit rate
+  - pcm: support audio/L16 (RFC 2586) and audio/x-mpd-float
+  - sidplay: faster scanning
+  - wavpack: large file support
+  - wavpack: support DSD (WavPack 5)
+  - wavpack: archive support
+* playlist
+  - cue: don't skip pregap
+  - embcue: fix last track
+  - flac: new plugin which reads the "CUESHEET" metadata block
+* output
+  - alsa: fix multi-channel order
+  - alsa: remove option "use_mmap"
+  - alsa: support DSD_U32
+  - alsa: disable DoP if it fails
+  - jack: reduce CPU usage
+  - pulse: set channel map to WAVE-EX
+  - recorder: record tags
+  - recorder: allow dynamic file names
+  - sndio: new output plugin
+* mixer
+  - null: new plugin
+* resampler
+  - new block "resampler" in configuration file
+    replacing the old "samplerate_converter" setting
+  - soxr: allow multi-threaded resampling
+* player
+  - reset song priority on playback
+  - reduce xruns
+* write database and state file atomically
+* always write UTF-8 to the log file.
+* remove dependency on GLib
+* support libsystemd (instead of the older libsystemd-daemon)
+* database
+  - proxy: add TCP keepalive option
+* update
+  - apply .mpdignore matches to subdirectories
+* switch the code base to C++14
+  - GCC 4.9 or clang 3.4 (or newer) recommended
+
+ver 0.19.21 (2016/12/13)
+* decoder
+  - ffmpeg: fix crash bug
+* fix unit test failure after recent "setprio" change
+* systemd: add user unit
+
+ver 0.19.20 (2016/12/09)
+* protocol
+  - "setprio" re-enqueues old song if priority has been raised
+* decoder
+  - ffmpeg: ignore empty packets
+  - pcm: fix corruption bug with partial frames (after short read)
+  - sidplay: fix playback speed with libsidplayfp
+* output
+  - winmm: fix 8 bit playback
+* fix gcc 7.0 -Wimplicit-fallthrough
+* systemd: paranoid security settings
+
+ver 0.19.19 (2016/08/23)
+* decoder
+  - ffmpeg: bug fix for FFmpeg 3.1 support
+  - wildmidi: support libWildMidi 0.4
+* output
+  - pulse: support 32 bit, 24 bit and floating point playback
+* support non-x86 NetBSD
+* fix clang 3.9 warnings
+
+ver 0.19.18 (2016/08/05)
+* decoder
+  - ffmpeg: fix crash with older FFmpeg versions (< 3.0)
+  - ffmpeg: log detailed error message
+  - ffmpeg: support FFmpeg 3.1
+  - sidplay: detect libsidplay2 with pkg-config
+  - sidplay: log detailed error message
+  - sidplay: read the "date" tag
+  - sidplay: allow building with libsidplayfp instead of libsidplay2
+* output
+  - shout: recognize setting "encoder" instead of "encoding"
+* fix memory leak after stream failure
+* fix build failure with Boost 1.61
+* require gcc 4.7 or newer
+
+ver 0.19.17 (2016/07/09)
+* decoder
+  - flac: fix assertion failure while seeking
+  - flac: fix stream duration indicator
+  - fix seek problems in several plugins
+* fix spurious seek error "Failed to allocate silence buffer"
+* replay gain: fix "replay_gain_handler mixer" setting
+* DSD: use 0x69 as silence pattern
+* fix use-after-free bug on "close" and "kill"
+
+ver 0.19.16 (2016/06/13)
+* faster seeking
+* fix system include path order
+* add missing DocBook file to tarball
+
+ver 0.19.15 (2016/04/30)
+* decoder
+  - ffmpeg: support FFmpeg 3.0
+  - ffmpeg: use as fallback instead of "mad" if no plugin matches
+  - opus: support bigger OpusTags packets
+* fix more build failures on non-glibc builds due to constexpr Mutex
+* fix build failure due to missing include
+* fix unit test on Alpha
+
+ver 0.19.14 (2016/03/18)
+* decoder
+  - dsdiff: fix off-by-one buffer overflow
+  - opus: limit tag size to 64 kB
+* archive
+  - iso9660: fix buffer overflow
+* fix quadratic runtime bug in the tag pool
+* fix build failures on non-glibc builds due to constexpr Mutex
+
+ver 0.19.13 (2016/02/23)
+* tags
+  - aiff, riff: fix ID3 chunk padding
+* decoder
+  - ffmpeg: support the TAK codec
+* fix disappearing duration of remote songs during playback
+* initialize supplementary groups with glibc 2.19+
+
+ver 0.19.12 (2015/12/15)
+* fix assertion failure on malformed UTF-8 tag
+* fix build failure on non-Linux systems
+* fix LimitRTTIME in systemd unit file
+
+ver 0.19.11 (2015/10/27)
+* tags
+  - ape: fix buffer overflow
+* decoder
+  - ffmpeg: fix crash due to wrong avio_alloc_context() call
+  - gme: don't loop forever, fall back to GME's default play length
+* encoder
+  - flac: fix crash with 32 bit playback
+* mixer
+  - fix mixer lag after enabling/disabling output
+
+ver 0.19.10 (2015/06/21)
+* input
+  - curl: fix deadlock on small responses
+  - smbclient: fix DFF playback
+* decoder
+  - ffmpeg: improve seeking accuracy
+  - fix stuck stream tags
+* encoder
+  - opus: fix bogus granulepos
+* output
+  - fix failure to open device right after booting
+* neighbor
+  - nfs: fix deadlock when connecting
+* fix "single" mode breakage due to queue edits
+
+ver 0.19.9 (2015/02/06)
+* decoder
+  - dsdiff, dsf: raise ID3 tag limit to 1 MB
+* playlist: fix loading duplicate tag types from state file
+* despotify: remove defunct plugin
+* fix clock integer overflow on OS X
+* fix gcc 5.0 warnings
+* fix build failure with uClibc
+* fix build failure on non-POSIX operating systems
+* fix dependency issue on parallel Android build
+* fix database/state file saving on Windows
+
+ver 0.19.8 (2015/01/14)
+* input
+  - curl: fix bug after rewinding from end-of-file
+  - mms: reduce delay at the beginning of playback
+* decoder
+  - dsdiff, dsf: allow ID3 tags larger than 4 kB
+  - ffmpeg: support interleaved floating point
+* fix clang 3.6 warnings
+* fix build failure on NetBSD
+
+ver 0.19.7 (2014/12/17)
+* input
+  - nfs: fix crash while canceling a failing file open operation
+  - nfs: fix memory leak on connection failure
+  - nfs: fix reconnect after mount failure
+  - nfs: implement mount timeout (60 seconds)
+* storage
+  - nfs: implement I/O timeout (60 seconds)
+* playlist
+  - embcue: fix filename suffix detection
+  - don't skip non-existent songs in "listplaylist"
+* decoder
+  - ffmpeg: fix time stamp underflow
+* fix memory allocator bug on Windows
+
+ver 0.19.6 (2014/12/08)
+* decoder
+  - ffmpeg: support FFmpeg 2.5
+* fix build failure with musl
+* android
+  - update libFLAC to 1.3.1
+  - update FFmpeg to 2.5
+
 ver 0.19.5 (2014/11/26)
 * input
  - nfs: fix crash on connection failure
@@ -138,6 +394,25 @@ ver 0.19 (2014/10/10)
 * install systemd unit for socket activation
 * Android port

+ver 0.18.23 (2015/02/06)
+* despotify: remove defunct plugin
+* fix clock integer overflow on OS X
+* fix gcc 5.0 warnings
+
+ver 0.18.22 (2015/01/14)
+* fix clang 3.6 warnings
+
+ver 0.18.21 (2014/12/17)
+* playlist
+  - embcue: fix filename suffix detection
+* decoder
+  - ffmpeg: fix time stamp underflow
+
+ver 0.18.20 (2014/12/08)
+* decoder
+  - ffmpeg: support FFmpeg 2.5
+* fix build failure with musl
+
 ver 0.18.19 (2014/11/26)
 * archive
  - zzip: fix crash after seeking
--- a/17
+++ b/17
@@ -1,17 +0,0 @@
-
-		       Music Player Daemon (MPD)
-			http://www.musicpd.org
-
-A daemon for playing music of various formats.  Music is played through the 
-server's audio device.  The daemon stores info about all available music, 
-and this info can be easily searched and retrieved.  Player control, info
-retrieval, and playlist management can all be managed remotely.
-
-For basic installation information see the INSTALL file.
-
-MPD is released under the GNU General Public License version 2, which is
-distributed in the COPYING file.
-
-You should have received a copy of the GNU General Public License along with
-this program.  If not, see <http://www.gnu.org/licenses/>.
-
--- a/README.md
+++ b/README.md
@@ -0,0 +1,28 @@
+# Music Player Daemon
+
+http://www.musicpd.org
+
+A daemon for playing music of various formats.  Music is played through the 
+server's audio device.  The daemon stores info about all available music, 
+and this info can be easily searched and retrieved.  Player control, info
+retrieval, and playlist management can all be managed remotely.
+
+For basic installation information see the INSTALL file.
+
+# Users
+
+- [Manual](http://www.musicpd.org/doc/user/)
+- [Forum](http://forum.musicpd.org/)
+- [IRC](irc://chat.freenode.net/#mpd)
+- [Bug tracker](http://bugs.musicpd.org/)
+
+# Developers
+
+- [Protocol specification](http://www.musicpd.org/doc/protocol/)
+- [Developer manual](http://www.musicpd.org/doc/developer/)
+
+# Legal
+
+MPD is released under the
+[GNU General Public License version 2](https://www.gnu.org/licenses/gpl-2.0.txt),
+which is distributed in the COPYING file.
--- a/android/AndroidManifest.xml
+++ b/android/AndroidManifest.xml
@@ -2,8 +2,8 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
          package="org.musicpd"
          android:installLocation="auto"
-          android:versionCode="9"
-          android:versionName="0.19.5">
+          android:versionCode="13"
+          android:versionName="0.19.9">

  <uses-sdk android:minSdkVersion="9" android:targetSdkVersion="17"/>

--- a/android/build.py
+++ b/android/build.py
@@ -1,10 +1,7 @@
 #!/usr/bin/env python3

 import os, os.path
-import sys, shutil, subprocess
-import urllib.request
-import hashlib
-import re
+import sys, subprocess

 if len(sys.argv) < 3:
    print("Usage: build.py SDK_PATH NDK_PATH [configure_args...]", file=sys.stderr)
@@ -22,412 +19,135 @@ if not os.path.isdir(ndk_path):
    print("NDK not found in", ndk_path, file=sys.stderr)
    sys.exit(1)

+# select the NDK target
+arch = 'arm-linux-androideabi'
+
 # the path to the MPD sources
-mpd_path = os.path.dirname(os.path.dirname(sys.argv[0]))
+mpd_path = os.path.abspath(os.path.join(os.path.dirname(sys.argv[0]) or '.', '..'))
+sys.path[0] = os.path.join(mpd_path, 'python')

 # output directories
-lib_path = os.path.abspath('lib')
-tarball_path = lib_path
-src_path = os.path.join(lib_path, 'src')
-build_path = os.path.join(lib_path, 'build')
-root_path = os.path.join(lib_path, 'root')
+from build.dirs import lib_path, tarball_path, src_path
+
+arch_path = os.path.join(lib_path, arch)
+build_path = os.path.join(arch_path, 'build')

 # build host configuration
 build_arch = 'linux-x86_64'

-# redirect pkg-config to use our root directory instead of the default
-# one on the build host
-os.environ['PKG_CONFIG_LIBDIR'] = os.path.join(root_path, 'lib/pkgconfig')
-
-# select the NDK compiler
-gcc_version = '4.9'
-llvm_version = '3.5'
-
-# select the NDK target
-ndk_arch = 'arm'
-host_arch = 'arm-linux-androideabi'
-android_abi = 'armeabi-v7a'
-ndk_platform = 'android-14'
-
 # set up the NDK toolchain

-gcc_toolchain = os.path.join(ndk_path, 'toolchains', host_arch + '-' + gcc_version, 'prebuilt', build_arch)
-llvm_toolchain = os.path.join(ndk_path, 'toolchains', 'llvm-' + llvm_version, 'prebuilt', build_arch)
-ndk_platform_path = os.path.join(ndk_path, 'platforms', ndk_platform)
-target_root = os.path.join(ndk_platform_path, 'arch-' + ndk_arch)
+class AndroidNdkToolchain:
+    def __init__(self, tarball_path, src_path, build_path,
+                 use_cxx):
+        self.tarball_path = tarball_path
+        self.src_path = src_path
+        self.build_path = build_path

-llvm_triple = 'armv7-none-linux-androideabi'
+        self.ndk_arch = 'arm'
+        android_abi = 'armeabi-v7a'
+        ndk_platform = 'android-14'

-def select_toolchain(use_cxx, use_clang):
-    global cc, cxx, ar, strip, cflags, cxxflags, cppflags, ldflags, libs
+        # select the NDK compiler
+        gcc_version = '4.9'

-    target_arch = '-march=armv7-a -mfloat-abi=softfp'
-    if use_clang:
-        cc = os.path.join(llvm_toolchain, 'bin/clang')
-        cxx = os.path.join(llvm_toolchain, 'bin/clang++')
-        target_arch += ' -target ' + llvm_triple + ' -integrated-as -gcc-toolchain ' + gcc_toolchain
-    else:
-        cc = os.path.join(gcc_toolchain, 'bin', host_arch + '-gcc')
-        cxx = os.path.join(gcc_toolchain, 'bin', host_arch + '-g++')
-    ar = os.path.join(gcc_toolchain, 'bin', host_arch + '-ar')
-    strip = os.path.join(gcc_toolchain, 'bin', host_arch + '-strip')
+        ndk_platform_path = os.path.join(ndk_path, 'platforms', ndk_platform)
+        sysroot = os.path.join(ndk_platform_path, 'arch-' + self.ndk_arch)

-    libstdcxx_path = os.path.join(ndk_path, 'sources/cxx-stl/gnu-libstdc++', gcc_version)
-    libstdcxx_cppflags = '-isystem ' + os.path.join(libstdcxx_path, 'include') + ' -isystem ' + os.path.join(libstdcxx_path, 'libs', android_abi, 'include')
-    if use_clang:
-        libstdcxx_cppflags += ' -D__STRICT_ANSI__'
-    libstdcxx_ldadd = os.path.join(libstdcxx_path, 'libs', android_abi, 'libgnustl_static.a')
+        install_prefix = os.path.join(arch_path, 'root')

-    cflags = '-Os -g ' + target_arch
-    cxxflags = '-Os -g ' + target_arch
-    cppflags = '--sysroot=' + target_root + ' -I' + root_path + '/include'
-    ldflags = '--sysroot=' + target_root + ' -L' + root_path + '/lib'
-    libs = ''
+        self.arch = arch
+        self.install_prefix = install_prefix
+        self.sysroot = sysroot

-    if use_cxx:
-        libs += ' ' + libstdcxx_ldadd
-        cppflags += ' ' + libstdcxx_cppflags
+        toolchain_path = os.path.join(ndk_path, 'toolchains', arch + '-' + gcc_version, 'prebuilt', build_arch)
+        llvm_path = os.path.join(ndk_path, 'toolchains', 'llvm', 'prebuilt', build_arch)
+        llvm_triple = 'armv7-none-linux-androideabi'

-def file_md5(path):
-    """Calculate the MD5 checksum of a file and return it in hexadecimal notation."""
+        common_flags = '-march=armv7-a -mfloat-abi=softfp'

-    with open(path, 'rb') as f:
-        m = hashlib.md5()
-        while True:
-            data = f.read(65536)
-            if len(data) == 0:
-                # end of file
-                return m.hexdigest()
-            m.update(data)
+        toolchain_bin = os.path.join(toolchain_path, 'bin')
+        llvm_bin = os.path.join(llvm_path, 'bin')
+        self.cc = os.path.join(llvm_bin, 'clang')
+        self.cxx = os.path.join(llvm_bin, 'clang++')
+        common_flags += ' -target ' + llvm_triple + ' -integrated-as -gcc-toolchain ' + toolchain_path

-def download_tarball(url, md5):
-    """Download a tarball, verify its MD5 checksum and return the local path."""
+        self.ar = os.path.join(toolchain_bin, arch + '-ar')
+        self.ranlib = os.path.join(toolchain_bin, arch + '-ranlib')
+        self.nm = os.path.join(toolchain_bin, arch + '-nm')
+        self.strip = os.path.join(toolchain_bin, arch + '-strip')

-    global tarball_path
-    os.makedirs(tarball_path, exist_ok=True)
-    path = os.path.join(tarball_path, os.path.basename(url))
+        self.cflags = '-Os -g ' + common_flags
+        self.cxxflags = '-Os -g ' + common_flags
+        self.cppflags = '--sysroot=' + self.sysroot + ' -isystem ' + os.path.join(install_prefix, 'include')
+        self.ldflags = '--sysroot=' + self.sysroot + ' ' + common_flags + ' -L' + os.path.join(install_prefix, 'lib')
+        self.libs = ''

-    try:
-        calculated_md5 = file_md5(path)
-        if md5 == calculated_md5: return path
-        os.unlink(path)
-    except FileNotFoundError:
-        pass
+        self.is_arm = self.ndk_arch == 'arm'
+        self.is_armv7 = self.is_arm and 'armv7' in self.cflags
+        self.is_windows = False

-    tmp_path = path + '.tmp'
+        libstdcxx_path = os.path.join(ndk_path, 'sources/cxx-stl/gnu-libstdc++', gcc_version)
+        libstdcxx_cppflags = '-isystem ' + os.path.join(libstdcxx_path, 'include') + ' -isystem ' + os.path.join(libstdcxx_path, 'libs', android_abi, 'include')
+        libstdcxx_ldadd = os.path.join(libstdcxx_path, 'libs', android_abi, 'libgnustl_static.a')

-    print("download", url)
-    urllib.request.urlretrieve(url, tmp_path)
-    calculated_md5 = file_md5(tmp_path)
-    if calculated_md5 != md5:
-        os.unlink(tmp_path)
-        raise "MD5 mismatch"
+        if use_cxx:
+            self.libs += ' ' + libstdcxx_ldadd
+            self.cppflags += ' ' + libstdcxx_cppflags

-    os.rename(tmp_path, path)
-    return path
+        self.env = dict(os.environ)

-class Project:
-    def __init__(self, url, md5, installed, name=None, version=None,
-                 base=None,
-                 use_cxx=False, use_clang=False):
-        if base is None:
-            basename = os.path.basename(url)
-            m = re.match(r'^(.+)\.(tar(\.(gz|bz2|xz|lzma))?|zip)$', basename)
-            if not m: raise
-            self.base = m.group(1)
-        else:
-            self.base = base
-
-        if name is None or version is None:
-            m = re.match(r'^([-\w]+)-(\d[\d.]*[a-z]?)$', self.base)
-            if name is None: name = m.group(1)
-            if version is None: version = m.group(2)
-
-        self.name = name
-        self.version = version
-
-        self.url = url
-        self.md5 = md5
-        self.installed = installed
-
-        self.use_cxx = use_cxx
-        self.use_clang = use_clang
-
-    def download(self):
-        return download_tarball(self.url, self.md5)
-
-    def is_installed(self):
-        global root_path
-        tarball = self.download()
-        installed = os.path.join(root_path, self.installed)
-        tarball_mtime = os.path.getmtime(tarball)
-        try:
-            return os.path.getmtime(installed) >= tarball_mtime
-        except FileNotFoundError:
-            return False
-
-    def unpack(self):
-        global src_path
-        tarball = self.download()
-        path = os.path.join(src_path, self.base)
-        try:
-            shutil.rmtree(path)
-        except FileNotFoundError:
-            pass
-        os.makedirs(src_path, exist_ok=True)
-        subprocess.check_call(['/bin/tar', 'xfC', tarball, src_path])
-        return path
-
-    def make_build_path(self):
-        path = os.path.join(build_path, self.base)
-        try:
-            shutil.rmtree(path)
-        except FileNotFoundError:
-            pass
-        os.makedirs(path, exist_ok=True)
-        return path
-
-class AutotoolsProject(Project):
-    def __init__(self, url, md5, installed, configure_args=[],
-                 autogen=False,
-                 cppflags='',
-                 **kwargs):
-        Project.__init__(self, url, md5, installed, **kwargs)
-        self.configure_args = configure_args
-        self.autogen = autogen
-        self.cppflags = cppflags
-
-    def build(self):
-        src = self.unpack()
-        if self.autogen:
-            subprocess.check_call(['/usr/bin/aclocal'], cwd=src)
-            subprocess.check_call(['/usr/bin/automake', '--add-missing', '--force-missing', '--foreign'], cwd=src)
-            subprocess.check_call(['/usr/bin/autoconf'], cwd=src)
-            subprocess.check_call(['/usr/bin/libtoolize', '--force'], cwd=src)
-
-        build = self.make_build_path()
-
-        select_toolchain(use_cxx=self.use_cxx, use_clang=self.use_clang)
-        configure = [
-            os.path.join(src, 'configure'),
-            'CC=' + cc,
-            'CXX=' + cxx,
-            'CFLAGS=' + cflags,
-            'CXXFLAGS=' + cxxflags,
-            'CPPFLAGS=' + cppflags + ' ' + self.cppflags,
-            'LDFLAGS=' + ldflags,
-            'LIBS=' + libs,
-            'AR=' + ar,
-            'STRIP=' + strip,
-            '--host=' + host_arch,
-            '--prefix=' + root_path,
-            '--with-sysroot=' + target_root,
-            '--enable-silent-rules',
-        ] + self.configure_args
-
-        subprocess.check_call(configure, cwd=build)
-        subprocess.check_call(['/usr/bin/make', '--quiet', '-j12'], cwd=build)
-        subprocess.check_call(['/usr/bin/make', '--quiet', 'install'], cwd=build)
-
-class FfmpegProject(Project):
-    def __init__(self, url, md5, installed, configure_args=[],
-                 cppflags='',
-                 **kwargs):
-        Project.__init__(self, url, md5, installed, **kwargs)
-        self.configure_args = configure_args
-        self.cppflags = cppflags
-
-    def build(self):
-        src = self.unpack()
-        build = self.make_build_path()
-
-        select_toolchain(use_cxx=self.use_cxx, use_clang=self.use_clang)
-        configure = [
-            os.path.join(src, 'configure'),
-            '--cc=' + cc,
-            '--cxx=' + cxx,
-            '--extra-cflags=' + cflags + ' ' + cppflags + ' ' + self.cppflags,
-            '--extra-cxxflags=' + cxxflags + ' ' + cppflags + ' ' + self.cppflags,
-            '--extra-ldflags=' + ldflags,
-            '--extra-libs=' + libs,
-            '--ar=' + ar,
-            '--enable-cross-compile',
-            '--target-os=linux',
-            '--arch=' + ndk_arch,
-            '--cpu=cortex-a8',
-            '--prefix=' + root_path,
-        ] + self.configure_args
-
-        subprocess.check_call(configure, cwd=build)
-        subprocess.check_call(['/usr/bin/make', '--quiet', '-j12'], cwd=build)
-        subprocess.check_call(['/usr/bin/make', '--quiet', 'install'], cwd=build)
-
-class BoostProject(Project):
-    def __init__(self, url, md5, installed,
-                 **kwargs):
-        m = re.match(r'.*/boost_(\d+)_(\d+)_(\d+)\.tar\.bz2$', url)
-        version = "%s.%s.%s" % (m.group(1), m.group(2), m.group(3))
-        Project.__init__(self, url, md5, installed,
-                         name='boost', version=version,
-                         **kwargs)
-
-    def build(self):
-        src = self.unpack()
-
-        # install the headers manually; don't build any library
-        # (because right now, we only use header-only libraries)
-        includedir = os.path.join(root_path, 'include')
-        for dirpath, dirnames, filenames in os.walk(os.path.join(src, 'boost')):
-            relpath = dirpath[len(src)+1:]
-            destdir = os.path.join(includedir, relpath)
-            try:
-                os.mkdir(destdir)
-            except:
-                pass
-            for name in filenames:
-                if name[-4:] == '.hpp':
-                    shutil.copyfile(os.path.join(dirpath, name),
-                                    os.path.join(destdir, name))
+        # redirect pkg-config to use our root directory instead of the
+        # default one on the build host
+        self.env['PKG_CONFIG_LIBDIR'] = os.path.join(install_prefix, 'lib/pkgconfig')

 # a list of third-party libraries to be used by MPD on Android
+from build.libs import *
 thirdparty_libs = [
-    AutotoolsProject(
-        'http://downloads.xiph.org/releases/ogg/libogg-1.3.2.tar.xz',
-        '5c3a34309d8b98640827e5d0991a4015',
-        'lib/libogg.a',
-        ['--disable-shared', '--enable-static'],
-    ),
-
-    AutotoolsProject(
-        'http://downloads.xiph.org/releases/vorbis/libvorbis-1.3.4.tar.xz',
-        '55f2288055e44754275a17c9a2497391',
-        'lib/libvorbis.a',
-        ['--disable-shared', '--enable-static'],
-    ),
-
-    AutotoolsProject(
-        'http://downloads.xiph.org/releases/opus/opus-1.1.tar.gz',
-        'c5a8cf7c0b066759542bc4ca46817ac6',
-        'lib/libopus.a',
-        ['--disable-shared', '--enable-static'],
-        use_clang=True,
-    ),
-
-    AutotoolsProject(
-        'https://svn.xiph.org/releases/flac/flac-1.3.0.tar.xz',
-        '13b5c214cee8373464d3d65dee362cdd',
-        'lib/libFLAC.a',
-        [
-            '--disable-shared', '--enable-static',
-            '--disable-xmms-plugin', '--disable-cpplibs',
-        ],
-        use_clang=True,
-    ),
-
-    AutotoolsProject(
-        'ftp://ftp.mars.org/pub/mpeg/libid3tag-0.15.1b.tar.gz',
-        'e5808ad997ba32c498803822078748c3',
-        'lib/libid3tag.a',
-        ['--disable-shared', '--enable-static'],
-        autogen=True,
-    ),
-
-    AutotoolsProject(
-        'ftp://ftp.mars.org/pub/mpeg/libmad-0.15.1b.tar.gz',
-        '1be543bc30c56fb6bea1d7bf6a64e66c',
-        'lib/libmad.a',
-        ['--disable-shared', '--enable-static'],
-        autogen=True,
-    ),
-
-    FfmpegProject(
-        'http://www.ffmpeg.org/releases/ffmpeg-2.2.3.tar.bz2',
-        'dbb5b6b69bd010916f17df0ae596e0b1',
-        'lib/libavcodec.a',
-        [
-            '--disable-shared', '--enable-static',
-            '--enable-gpl',
-            '--enable-small',
-            '--disable-pthreads',
-            '--disable-runtime-cpudetect',
-            '--disable-programs',
-            '--disable-doc',
-            '--disable-avdevice',
-            '--disable-swresample',
-            '--disable-swscale',
-            '--disable-postproc',
-            '--disable-avfilter',
-            '--disable-network',
-            '--disable-encoders',
-            '--disable-protocols',
-            '--disable-outdevs',
-            '--disable-filters',
-        ],
-    ),
-
-    AutotoolsProject(
-        'http://curl.haxx.se/download/curl-7.37.0.tar.lzma',
-        '54bfd1eb5214f604186d6f5ac61c7781',
-        'lib/libcurl.a',
-        [
-            '--disable-shared', '--enable-static',
-            '--disable-debug',
-            '--enable-http',
-            '--enable-ipv6',
-            '--disable-ftp', '--disable-file',
-            '--disable-ldap', '--disable-ldaps',
-            '--disable-rtsp', '--disable-proxy', '--disable-dict', '--disable-telnet',
-            '--disable-tftp', '--disable-pop3', '--disable-imap', '--disable-smtp',
-            '--disable-gopher',
-            '--disable-manual',
-            '--disable-threaded-resolver', '--disable-verbose', '--disable-sspi',
-            '--disable-crypto-auth', '--disable-ntlm-wb', '--disable-tls-srp', '--disable-cookies',
-            '--without-ssl', '--without-gnutls', '--without-nss', '--without-libssh2',
-        ],
-        use_clang=True,
-    ),
-
-    BoostProject(
-        'http://netcologne.dl.sourceforge.net/project/boost/boost/1.55.0/boost_1_55_0.tar.bz2',
-        'd6eef4b4cacb2183f2bf265a5a03a354',
-        'include/boost/version.hpp',
-    ),
+    libogg,
+    libvorbis,
+    opus,
+    flac,
+    libid3tag,
+    libmad,
+    ffmpeg,
+    curl,
+    boost,
 ]

 # build the third-party libraries
 for x in thirdparty_libs:
-    if not x.is_installed():
-        x.build()
+    toolchain = AndroidNdkToolchain(tarball_path, src_path, build_path,
+                                    use_cxx=x.use_cxx)
+    if not x.is_installed(toolchain):
+        x.build(toolchain)

 # configure and build MPD
-select_toolchain(use_cxx=True, use_clang=True)
+toolchain = AndroidNdkToolchain(tarball_path, src_path, build_path,
+                                use_cxx=True)

 configure = [
    os.path.join(mpd_path, 'configure'),
-    'CC=' + cc,
-    'CXX=' + cxx,
-    'CFLAGS=' + cflags,
-    'CXXFLAGS=' + cxxflags,
-    'CPPFLAGS=' + cppflags,
-    'LDFLAGS=' + ldflags,
-    'LIBS=' + libs,
-    'AR=' + ar,
-    'STRIP=' + strip,
-    '--host=' + host_arch,
-    '--prefix=' + root_path,
-    '--with-sysroot=' + target_root,
+    'CC=' + toolchain.cc,
+    'CXX=' + toolchain.cxx,
+    'CFLAGS=' + toolchain.cflags,
+    'CXXFLAGS=' + toolchain.cxxflags,
+    'CPPFLAGS=' + toolchain.cppflags,
+    'LDFLAGS=' + toolchain.ldflags,
+    'LIBS=' + toolchain.libs,
+    'AR=' + toolchain.ar,
+    'RANLIB=' + toolchain.ranlib,
+    'STRIP=' + toolchain.strip,
+    '--host=' + toolchain.arch,
+    '--prefix=' + toolchain.install_prefix,
+    '--with-sysroot=' + toolchain.sysroot,
    '--with-android-sdk=' + sdk_path,

    '--enable-silent-rules',

-    '--disable-glib',
    '--disable-icu',

-    # disabled for now because these features require GLib:
-    '--disable-httpd-output',
-    '--disable-vorbis-encoder',
-
 ] + configure_args

-subprocess.check_call(configure)
-subprocess.check_call(['/usr/bin/make', '--quiet', '-j12'])
+subprocess.check_call(configure, env=toolchain.env)
+subprocess.check_call(['/usr/bin/make', '--quiet', '-j12'], env=toolchain.env)
--- a/android/src/Bridge.java
+++ b/android/src/Bridge.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * Copyright 2003-2017 The Music Player Daemon Project
 * http://www.musicpd.org
 *
 * This program is free software; you can redistribute it and/or modify
--- a/android/src/Loader.java
+++ b/android/src/Loader.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * Copyright 2003-2017 The Music Player Daemon Project
 * http://www.musicpd.org
 *
 * This program is free software; you can redistribute it and/or modify
--- a/android/src/Main.java
+++ b/android/src/Main.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * Copyright 2003-2017 The Music Player Daemon Project
 * http://www.musicpd.org
 *
 * This program is free software; you can redistribute it and/or modify
--- a/configure.ac
+++ b/configure.ac
--- a/doc/developer.xml
+++ b/doc/developer.xml
@@ -1,10 +1,11 @@
 <?xml version='1.0' encoding="utf-8"?>
-<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
-               "docbook/dtd/xml/4.2/docbookx.dtd">
+<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
+                      "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
+
 <book>
  <title>The Music Player Daemon - Developer's Manual</title>

-  <chapter>
+  <chapter id="introduction">
    <title>Introduction</title>

    <para>
@@ -20,7 +21,7 @@
    </para>
  </chapter>

-  <chapter>
+  <chapter id="code_style">
    <title>Code Style</title>

    <itemizedlist>
@@ -39,9 +40,35 @@

      <listitem>
        <para>
-          the code should be C++11 compliant, and must compile with
-          <application>GCC</application> 4.6 and
-          <application>clang</application> 3.2
+          comment your code, document your APIs
+        </para>
+      </listitem>
+
+      <listitem>
+        <para>
+          the code should be C++14 compliant, and must compile with
+          <application>GCC</application> 4.9 and
+          <application>clang</application> 3.4
+        </para>
+      </listitem>
+
+      <listitem>
+        <para>
+          report error conditions with C++ exceptions, preferable
+          derived from <varname>std::runtime_error</varname>
+        </para>
+      </listitem>
+
+      <listitem>
+        <para>
+          all code must be exception-safe
+        </para>
+      </listitem>
+
+      <listitem>
+        <para>
+          classes and functions names use CamelCase; variables are
+          lower-case with words separated by underscore
        </para>
      </listitem>

@@ -51,9 +78,9 @@
        </para>

        <programlisting lang="C">static inline int
-foo(const char *abc, int xyz)
+Foo(const char *abc, int xyz)
 {
-        if (abc == NULL) {
+        if (abc == nullptr) {
                LogWarning("Foo happened!");
                return -1;
        }
@@ -65,7 +92,7 @@ foo(const char *abc, int xyz)
    </itemizedlist>
  </chapter>

-  <chapter>
+  <chapter id="hacking">
    <title>Hacking The Source</title>

    <para>
@@ -150,7 +177,7 @@ foo(const char *abc, int xyz)
    </section>
  </chapter>

-  <chapter>
+  <chapter id="submitting_patches">
    <title>Submitting Patches</title>

    <para>
@@ -166,9 +193,16 @@ foo(const char *abc, int xyz)
      url="http://git.musicpd.org/account-policy.html">an account on
      git.musicpd.org</ulink>, but any public git repository will do.
    </para>
+
+    <para>
+      There is <ulink url="https://github.com/MaxKellermann/MPD">a
+      mirror of the <application>MPD</application> git repository on
+      GitHub</ulink>, and you can use that as well to submit pull
+      requests.
+    </para>
  </chapter>

-  <chapter>
+  <chapter id="tools">
    <title>Development Tools</title>

    <section>
--- a/doc/doxygen.conf.in
+++ b/doc/doxygen.conf.in
--- a/doc/include/tags.xml
+++ b/doc/include/tags.xml
@@ -0,0 +1,154 @@
+<?xml version='1.0' encoding="utf-8"?>
+<!DOCTYPE itemizedlist PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
+                              "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
+
+<itemizedlist>
+  <listitem>
+    <para>
+      <varname>artist</varname>: the artist name.  Its meaning is not
+      well-defined; see <varname>composer</varname> and
+      <varname>performer</varname> for more specific tags.
+    </para>
+  </listitem>
+
+  <listitem>
+    <para>
+      <varname>artistsort</varname>: same as
+      <varname>artist</varname>, but for sorting.  This usually omits
+      prefixes such as "The".
+    </para>
+  </listitem>
+
+  <listitem>
+    <para>
+      <varname>album</varname>: the album name.
+    </para>
+  </listitem>
+
+  <listitem>
+    <para>
+      <varname>albumsort</varname>: same as <varname>album</varname>,
+      but for sorting.
+    </para>
+  </listitem>
+
+  <listitem>
+    <para>
+      <varname>albumartist</varname>: on multi-artist albums, this is
+      the artist name which shall be used for the whole album.  The
+      exact meaning of this tag is not well-defined.
+    </para>
+  </listitem>
+
+  <listitem>
+    <para>
+      <varname>albumartistsort</varname>: same as
+      <varname>albumartist</varname>, but for sorting.
+    </para>
+  </listitem>
+
+  <listitem>
+    <para>
+      <varname>title</varname>: the song title.
+    </para>
+  </listitem>
+
+  <listitem>
+    <para>
+      <varname>track</varname>: the track number within the album.
+    </para>
+  </listitem>
+
+  <listitem>
+    <para>
+      <varname>name</varname>: a name for this song.  This is not the
+      song title.  The exact meaning of this tag is not well-defined.
+      It is often used by badly configured internet radio stations
+      with broken tags to squeeze both the artist name and the song
+      title in one tag.
+    </para>
+  </listitem>
+
+  <listitem>
+    <para>
+      <varname>genre</varname>: the music genre.
+    </para>
+  </listitem>
+
+  <listitem>
+    <para>
+      <varname>date</varname>: the song's release date.  This is
+      usually a 4-digit year.
+    </para>
+  </listitem>
+
+  <listitem>
+    <para>
+      <varname>composer</varname>: the artist who composed the song.
+    </para>
+  </listitem>
+
+  <listitem>
+    <para>
+      <varname>performer</varname>: the artist who performed the song.
+    </para>
+  </listitem>
+
+  <listitem>
+    <para>
+      <varname>comment</varname>: a human-readable comment about this
+      song.  The exact meaning of this tag is not well-defined.
+    </para>
+  </listitem>
+
+  <listitem>
+    <para>
+      <varname>disc</varname>: the disc number in a multi-disc album.
+    </para>
+  </listitem>
+
+  <listitem>
+    <para>
+      <varname>musicbrainz_artistid</varname>: the artist id in the
+      <ulink
+      url="http://musicbrainz.org/doc/MusicBrainzTag">MusicBrainz</ulink>
+      database.
+    </para>
+  </listitem>
+
+  <listitem>
+    <para>
+      <varname>musicbrainz_albumid</varname>: the album id in the
+      <ulink
+      url="http://musicbrainz.org/doc/MusicBrainzTag">MusicBrainz</ulink>
+      database.
+    </para>
+  </listitem>
+
+  <listitem>
+    <para>
+      <varname>musicbrainz_albumartistid</varname>: the album artist
+      id in the <ulink
+      url="http://musicbrainz.org/doc/MusicBrainzTag">MusicBrainz</ulink>
+      database.
+    </para>
+  </listitem>
+
+  <listitem>
+    <para>
+      <varname>musicbrainz_trackid</varname>: the track id in the
+      <ulink
+      url="http://musicbrainz.org/doc/MusicBrainzTag">MusicBrainz</ulink>
+      database.
+    </para>
+  </listitem>
+
+  <listitem>
+    <para>
+      <varname>musicbrainz_releasetrackid</varname>: the release track
+      id in the <ulink
+      url="http://musicbrainz.org/doc/MusicBrainzTag">MusicBrainz</ulink>
+      database.
+    </para>
+  </listitem>
+</itemizedlist>
--- a/doc/mpd.conf.5
+++ b/doc/mpd.conf.5
@@ -156,12 +156,6 @@ This specifies the character set used for the filesystem.  A list of supported
 character sets can be obtained by running "iconv \-l".  The default is
 determined from the locale when the db was originally created.
 .TP
-.B id3v1_encoding <charset>
-This specifies the character set which ID3v1 tags are encoded in.  A list of
-supported character sets can be obtained by running "iconv \-l".  The default is
-to let libid3tag convert them (from ISO-8859-1, as the standard specifies) and
-do no additional conversion.
-.TP
 .B gapless_mp3_playback <yes or no>
 This specifies whether to support gapless playback of MP3s which have the
 necessary headers.  Useful if your MP3s have headers with incorrect
@@ -174,18 +168,6 @@ MP3 playback.
 This specifies whether relative or absolute paths for song filenames are used
 when saving playlists.  The default is "no".
 .TP
-.B metadata_to_use <tags>
-This specifies the tag types that will be scanned for and made available to
-clients.  Note that you must recreate (not update) your database for changes to
-this parameter to take effect.  Possible values are artist, album, title,
-track, name, genre, date, composer, performer, comment, disc,
-musicbrainz_artistid, musicbrainz_albumid, musicbrainz_albumartistid,
-musicbrainz_releasetrackid, musicbrainz_trackid.  Multiple tags may be specified
-as a comma separated list.
-An example value is "artist,album,title,track".  The special value "none" may
-be used alone to disable all metadata.  The default is to use all known tag
-types except for comments and those starting with "musicbrainz".
-.TP
 .B auto_update <yes or no>
 This specifies the whether to support automatic update of music database when
 files are changed in music_directory. The default is to disable autoupdate
@@ -195,16 +177,6 @@ of database.
 Limit the depth of the directories being watched, 0 means only watch
 the music directory itself.  There is no limit by default.
 .TP
-.B despotify_user <name>
-This specifies the user to use when logging in to Spotify using the despotify plugins.
-.TP
-.B despotify_password <name>
-This specifies the password to use when logging in to Spotify using the despotify plugins.
-.TP
-.B despotify_high_bitrate <yes or no>
-This specifies if the requested bitrate for Spotify should be high or not. Higher sounds
-better but requires more processing and higher bandwidth. Default is yes.
-.TP
 .SH REQUIRED AUDIO OUTPUT PARAMETERS
 .TP
 .B type <type>
@@ -254,11 +226,6 @@ probably only useful if your alsa device has more than one
 identically\-named mixer control.  The default is "0".  Use "amixer
 scontrols" to see the list of controls with their indexes.
 .TP
-.B use_mmap <yes or no>
-Setting this allows you to use memory-mapped I/O.  Certain hardware setups may
-benefit from this, but most do not.  Most users do not need to set this.  The
-default is to not use memory-mapped I/O.
-.TP
 .B auto_resample <yes or no>
 Setting this to "no" disables ALSA's software resampling, if the
 hardware does not support a specific sample rate.  This lets MPD do
--- a/doc/mpdconf.example
+++ b/doc/mpdconf.example
@@ -75,7 +75,8 @@
 #
 # This setting sets the address for the daemon to listen on. Careful attention
 # should be paid if this is assigned to anything other then the default, any.
-# This setting can deny access to control of the daemon.
+# This setting can deny access to control of the daemon. Not effective if
+# systemd socket activiation is in use.
 #
 # For network
 #bind_to_address		"any"
@@ -115,7 +116,7 @@
 #
 # This setting defines a list of tag types that will be extracted during the
 # audio file discovery process. The complete list of possible values can be
-# found in the mpd.conf man page.
+# found in the user manual.
 #metadata_to_use	"artist,album,title,track,name,genre,date,composer,performer,disc"
 #
 # This setting enables automatic update of MPD's database when files in 
@@ -164,7 +165,7 @@
 # Permissions #################################################################
 #
 # If this setting is set, MPD will require password authorization. The password
-# can setting can be specified multiple times for different password profiles.
+# setting can be specified multiple times for different password profiles.
 #
 #password                        "password@read,add,control,admin"
 #
@@ -231,7 +232,7 @@ input {
 #
 #audio_output {
 #	type		"shout"
-#	encoding	"ogg"			# optional
+#	encoder		"vorbis"		# optional
 #	name		"My Shout Stream"
 #	host		"localhost"
 #	port		"8000"
@@ -304,6 +305,23 @@ input {
 ##	device		"Digital Audio (S/PDIF) (High Definition Audio Device)" # optional
 #}
 #
+# An example of an sndio output.
+#
+#audio_output {
+#	type		"sndio"
+#	name		"sndio output"
+#	mixer_type	"software"
+#}
+#
+# An example of an OS X output:
+#
+#audio_output {
+#	type		"osx"
+#	name		"My OS X Device"
+##	device		"Built-in Output"	# optional
+##	channel_map      "-1,-1,0,1"	# optional
+#}
+#
 ## Example "pipe" output:
 #
 #audio_output {
@@ -325,13 +343,6 @@ input {
 #	mixer_type      "none"			# optional
 #}
 #
-# If MPD has been compiled with libsamplerate support, this setting specifies 
-# the sample rate converter to use.  Possible values can be found in the 
-# mpd.conf man page or the libsamplerate documentation. By default, this is
-# setting is disabled.
-#
-#samplerate_converter		"Fastest Sinc Interpolator"
-#
 ###############################################################################


@@ -380,34 +391,4 @@ input {
 #
 #filesystem_charset		"UTF-8"
 #
-# This setting controls the encoding that ID3v1 tags should be converted from.
-#
-#id3v1_encoding			"ISO-8859-1"
-#
 ###############################################################################
-
-
-# SIDPlay decoder #############################################################
-#
-# songlength_database:
-#  Location of your songlengths file, as distributed with the HVSC.
-#  The sidplay plugin checks this for matching MD5 fingerprints.
-#  See http://www.c64.org/HVSC/DOCUMENTS/Songlengths.faq
-#
-# default_songlength:
-#  This is the default playing time in seconds for songs not in the
-#  songlength database, or in case you're not using a database.
-#  A value of 0 means play indefinitely.
-#
-# filter:
-#  Turns the SID filter emulation on or off.
-#
-#decoder {
-#	plugin			"sidplay"
-#	songlength_database	"/media/C64Music/DOCUMENTS/Songlengths.txt"
-#	default_songlength	"120"
-#	filter "true"
-#}
-#
-###############################################################################
-
--- a/doc/protocol.xml
+++ b/doc/protocol.xml
@@ -1,6 +1,7 @@
 <?xml version='1.0' encoding="utf-8"?>
-<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
-               "docbook/dtd/xml/4.2/docbookx.dtd">
+<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
+                      "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
+
 <book>
  <title>The Music Player Daemon protocol</title>

@@ -65,8 +66,8 @@
        <function>strcpy</function> just fine with UTF-8 encoded
        strings. For example: <returnvalue>OK</returnvalue> encoded in
        UTF-8 is simply <returnvalue>OK</returnvalue>.  For more
-        information on UTF=8:
-        http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8)
+        information on UTF-8:
+        <ulink url="http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8"/>)
      </para>
    </section>

@@ -201,6 +202,25 @@
        omitted, then the maximum possible value is assumed.
      </para>
    </section>
+
+    <section id="tags">
+      <title>Tags</title>
+
+      <para>
+        The following tags are supported by
+        <application>MPD</application>:
+      </para>
+
+      <xi:include href="include/tags.xml"
+                  xmlns:xi="http://www.w3.org/2001/XInclude"/>
+
+      <para>
+        There can be multiple values for some of these tags.  For
+        example, <application>MPD</application> may return multiple
+        lines with a <varname>performer</varname> tag.  A tag value is
+        a UTF-8 string.
+      </para>
+    </section>
  </chapter>

  <chapter id="recipes">
@@ -238,9 +258,10 @@
        "before" the current song in that sequence) will only be
        scheduled for repeated playback if its priority has become
        bigger than the priority of the current song.  Decreasing the
-        priority of a song will moved it farther to the end of the
+        priority of a song will move it farther to the end of the
        sequence.  Changing the priority of the current song has no
-        effect on the sequence.
+        effect on the sequence.  During playback, a song's priority is
+        reset to zero.
      </para>
    </section>
  </chapter>
@@ -515,6 +536,15 @@
                  </returnvalue>
                </para>
              </listitem>
+              <listitem>
+                <para>
+                  <varname>duration</varname>:
+                  <footnote id="since_0_20"><simpara>Introduced with <application>MPD</application> 0.20</simpara></footnote>
+                  <returnvalue>
+                    Duration of the current song in seconds.
+                  </returnvalue>
+                </para>
+              </listitem>
              <listitem>
                <para>
                  <varname>bitrate</varname>:
@@ -1141,7 +1171,7 @@ OK
          </term>
          <listitem>
            <para>
-              Searches case-sensitively for partial matches in the
+              Searches case-insensitively for partial matches in the
              current playlist.
            </para>
          </listitem>
@@ -1151,12 +1181,15 @@ OK
            <cmdsynopsis>
              <command>plchanges</command>
              <arg choice="req"><replaceable>VERSION</replaceable></arg>
+              <arg><replaceable>START:END</replaceable></arg>
            </cmdsynopsis>
          </term>
          <listitem>
            <para>
              Displays changed songs currently in the playlist since
-              <varname>VERSION</varname>.
+              <varname>VERSION</varname>.  Start and end positions may
+              be given to limit the output to changes in the given
+              range.
            </para>
            <para>
              To detect songs that were deleted at the end of the
@@ -1169,6 +1202,7 @@ OK
            <cmdsynopsis>
              <command>plchangesposid</command>
              <arg choice="req"><replaceable>VERSION</replaceable></arg>
+              <arg><replaceable>START:END</replaceable></arg>
            </cmdsynopsis>
          </term>
          <listitem>
@@ -1465,15 +1499,15 @@ OK
            <cmdsynopsis>
              <command>playlistmove</command>
              <arg choice="req"><replaceable>NAME</replaceable></arg>
-              <arg choice="req"><replaceable>SONGID</replaceable></arg>
-              <arg choice="req"><replaceable>SONGPOS</replaceable></arg>
+              <arg choice="req"><replaceable>FROM</replaceable></arg>
+              <arg choice="req"><replaceable>TO</replaceable></arg>
            </cmdsynopsis>
          </term>
          <listitem>
            <para>
-              Moves <varname>SONGID</varname> in the playlist
-              <filename>NAME.m3u</filename> to the position
-              <varname>SONGPOS</varname>.
+              Moves the song at position <varname>FROM</varname> in
+              the playlist <filename>NAME.m3u</filename> to the
+              position <varname>TO</varname>.
            </para>
          </listitem>
        </varlistentry>
@@ -1559,6 +1593,7 @@ OK
              <arg choice="req"><replaceable>TYPE</replaceable></arg>
              <arg choice="req"><replaceable>WHAT</replaceable></arg>
              <arg choice="opt"><replaceable>...</replaceable></arg>
+              <arg choice="opt">window <replaceable>START</replaceable>:<replaceable>END</replaceable></arg>
            </cmdsynopsis>
          </term>
          <listitem>
@@ -1603,6 +1638,13 @@ OK
            <para>
              <varname>WHAT</varname> is what to find.
            </para>
+
+            <para>
+              <varname>window</varname> can be used to query only a
+              portion of the real response.  The parameter is two
+              zero-based record numbers; a start number and an end
+              number.
+            </para>
          </listitem>
        </varlistentry>
        <varlistentry id="command_findadd">
@@ -1754,7 +1796,7 @@ OK
            <para>
              Clients that are connected via UNIX domain socket may
              use this command to read the tags of an arbitrary local
-              file (URI beginning with "file:///").
+              file (URI is an absolute path).
            </para>
          </listitem>
        </varlistentry>
@@ -1769,8 +1811,7 @@ OK
            <para>
              Read "comments" (i.e. key-value pairs) from the file
              specified by "URI".  This "URI" can be a path relative
-              to the music directory or a URL in the form
-              "file:///foo/bar.ogg".
+              to the music directory or an absolute path.
            </para>
            <para>
              This command may be used to list metadata of remote
@@ -1795,6 +1836,7 @@ OK
              <arg choice="req"><replaceable>TYPE</replaceable></arg>
              <arg choice="req"><replaceable>WHAT</replaceable></arg>
              <arg choice="opt"><replaceable>...</replaceable></arg>
+              <arg choice="opt">window <replaceable>START</replaceable>:<replaceable>END</replaceable></arg>
            </cmdsynopsis>
          </term>
          <listitem>
@@ -2119,6 +2161,30 @@ OK
            </para>
          </listitem>
        </varlistentry>
+
+        <varlistentry id="command_sticker_find_equals">
+          <term>
+            <cmdsynopsis>
+              <command>sticker</command>
+              <arg choice="plain">find</arg>
+              <arg choice="req"><replaceable>TYPE</replaceable></arg>
+              <arg choice="req"><replaceable>URI</replaceable></arg>
+              <arg choice="req"><replaceable>NAME</replaceable></arg>
+              <arg choice="plain">=</arg>
+              <arg choice="req"><replaceable>VALUE</replaceable></arg>
+            </cmdsynopsis>
+          </term>
+          <listitem>
+            <para>
+              Searches for stickers with the given value.
+            </para>
+
+            <para>
+              Other supported operators are:
+              "<function>&lt;</function>", "<function>&gt;</function>"
+            </para>
+          </listitem>
+        </varlistentry>
      </variablelist>
    </section>

--- a/doc/user.xml
+++ b/doc/user.xml
--- a/m4/ax_append_compile_flags.m4
+++ b/m4/ax_append_compile_flags.m4
@@ -4,7 +4,7 @@
 #
 # SYNOPSIS
 #
-#   AX_APPEND_COMPILE_FLAGS([FLAG1 FLAG2 ...], [FLAGS-VARIABLE], [EXTRA-FLAGS])
+#   AX_APPEND_COMPILE_FLAGS([FLAG1 FLAG2 ...], [FLAGS-VARIABLE], [EXTRA-FLAGS], [INPUT])
 #
 # DESCRIPTION
 #
@@ -20,6 +20,8 @@
 #   the flags: "CFLAGS EXTRA-FLAGS FLAG".  This can for example be used to
 #   force the compiler to issue an error when a bad flag is given.
 #
+#   INPUT gives an alternative input source to AC_COMPILE_IFELSE.
+#
 #   NOTE: This macro depends on the AX_APPEND_FLAG and
 #   AX_CHECK_COMPILE_FLAG. Please keep this macro in sync with
 #   AX_APPEND_LINK_FLAGS.
@@ -54,12 +56,12 @@
 #   modified version of the Autoconf Macro, you may extend this special
 #   exception to the GPL to apply to your modified version as well.

-#serial 4
+#serial 5

 AC_DEFUN([AX_APPEND_COMPILE_FLAGS],
 [AX_REQUIRE_DEFINED([AX_CHECK_COMPILE_FLAG])
 AX_REQUIRE_DEFINED([AX_APPEND_FLAG])
 for flag in $1; do
-  AX_CHECK_COMPILE_FLAG([$flag], [AX_APPEND_FLAG([$flag], [$2])], [], [$3])
+  AX_CHECK_COMPILE_FLAG([$flag], [AX_APPEND_FLAG([$flag], [$2])], [], [$3], [$4])
 done
 ])dnl AX_APPEND_COMPILE_FLAGS
--- a/m4/ax_append_flag.m4
+++ b/m4/ax_append_flag.m4
@@ -49,21 +49,23 @@
 #   modified version of the Autoconf Macro, you may extend this special
 #   exception to the GPL to apply to your modified version as well.

-#serial 2
+#serial 6

 AC_DEFUN([AX_APPEND_FLAG],
-[AC_PREREQ(2.59)dnl for _AC_LANG_PREFIX
-AS_VAR_PUSHDEF([FLAGS], [m4_default($2,_AC_LANG_PREFIX[FLAGS])])dnl
-AS_VAR_SET_IF(FLAGS,
-  [case " AS_VAR_GET(FLAGS) " in
-    *" $1 "*)
-      AC_RUN_LOG([: FLAGS already contains $1])
-      ;;
-    *)
-      AC_RUN_LOG([: FLAGS="$FLAGS $1"])
-      AS_VAR_SET(FLAGS, ["AS_VAR_GET(FLAGS) $1"])
-      ;;
-   esac],
-  [AS_VAR_SET(FLAGS,["$1"])])
+[dnl
+AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_SET_IF
+AS_VAR_PUSHDEF([FLAGS], [m4_default($2,_AC_LANG_PREFIX[FLAGS])])
+AS_VAR_SET_IF(FLAGS,[
+  AS_CASE([" AS_VAR_GET(FLAGS) "],
+    [*" $1 "*], [AC_RUN_LOG([: FLAGS already contains $1])],
+    [
+     AS_VAR_APPEND(FLAGS,[" $1"])
+     AC_RUN_LOG([: FLAGS="$FLAGS"])
+    ])
+  ],
+  [
+  AS_VAR_SET(FLAGS,[$1])
+  AC_RUN_LOG([: FLAGS="$FLAGS"])
+  ])
 AS_VAR_POPDEF([FLAGS])dnl
 ])dnl AX_APPEND_FLAG
--- a/m4/ax_append_link_flags.m4
+++ b/m4/ax_append_link_flags.m4
@@ -4,7 +4,7 @@
 #
 # SYNOPSIS
 #
-#   AX_APPEND_LINK_FLAGS([FLAG1 FLAG2 ...], [FLAGS-VARIABLE], [EXTRA-FLAGS])
+#   AX_APPEND_LINK_FLAGS([FLAG1 FLAG2 ...], [FLAGS-VARIABLE], [EXTRA-FLAGS], [INPUT])
 #
 # DESCRIPTION
 #
@@ -19,6 +19,8 @@
 #   EXTRA-FLAGS FLAG".  This can for example be used to force the linker to
 #   issue an error when a bad flag is given.
 #
+#   INPUT gives an alternative input source to AC_COMPILE_IFELSE.
+#
 #   NOTE: This macro depends on the AX_APPEND_FLAG and AX_CHECK_LINK_FLAG.
 #   Please keep this macro in sync with AX_APPEND_COMPILE_FLAGS.
 #
@@ -52,12 +54,12 @@
 #   modified version of the Autoconf Macro, you may extend this special
 #   exception to the GPL to apply to your modified version as well.

-#serial 4
+#serial 5

 AC_DEFUN([AX_APPEND_LINK_FLAGS],
 [AX_REQUIRE_DEFINED([AX_CHECK_LINK_FLAG])
 AX_REQUIRE_DEFINED([AX_APPEND_FLAG])
 for flag in $1; do
-  AX_CHECK_LINK_FLAG([$flag], [AX_APPEND_FLAG([$flag], [m4_default([$2], [LDFLAGS])])], [], [$3])
+  AX_CHECK_LINK_FLAG([$flag], [AX_APPEND_FLAG([$flag], [m4_default([$2], [LDFLAGS])])], [], [$3], [$4])
 done
 ])dnl AX_APPEND_LINK_FLAGS
--- a/m4/ax_boost_base.m4
+++ b/m4/ax_boost_base.m4
@@ -33,7 +33,7 @@
 #   and this notice are preserved. This file is offered as-is, without any
 #   warranty.

-#serial 23
+#serial 27

 AC_DEFUN([AX_BOOST_BASE],
 [
@@ -92,7 +92,10 @@ if test "x$want_boost" = "xyes"; then
    libsubdirs="lib"
    ax_arch=`uname -m`
    case $ax_arch in
-      x86_64|ppc64|s390x|sparc64|aarch64)
+      x86_64)
+        libsubdirs="lib64 libx32 lib lib64"
+        ;;
+      ppc64|s390x|sparc64|aarch64|ppc64le)
        libsubdirs="lib64 lib lib64"
        ;;
    esac
@@ -170,6 +173,10 @@ if test "x$want_boost" = "xyes"; then
    dnl if we found no boost with system layout we search for boost libraries
    dnl built and installed without the --layout=system option or for a staged(not installed) version
    if test "x$succeeded" != "xyes"; then
+        CPPFLAGS="$CPPFLAGS_SAVED"
+        LDFLAGS="$LDFLAGS_SAVED"
+        BOOST_CPPFLAGS=
+        BOOST_LDFLAGS=
        _version=0
        if test "$ac_boost_path" != ""; then
            if test -d "$ac_boost_path" && test -r "$ac_boost_path"; then
@@ -182,6 +189,12 @@ if test "x$want_boost" = "xyes"; then
                    VERSION_UNDERSCORE=`echo $_version | sed 's/\./_/'`
                    BOOST_CPPFLAGS="-I$ac_boost_path/include/boost-$VERSION_UNDERSCORE"
                done
+                dnl if nothing found search for layout used in Windows distributions
+                if test -z "$BOOST_CPPFLAGS"; then
+                    if test -d "$ac_boost_path/boost" && test -r "$ac_boost_path/boost"; then
+                        BOOST_CPPFLAGS="-I$ac_boost_path"
+                    fi
+                fi
            fi
        else
            if test "$cross_compiling" != yes; then
--- a/m4/ax_check_compile_flag.m4
+++ b/m4/ax_check_compile_flag.m4
@@ -55,10 +55,10 @@
 #   modified version of the Autoconf Macro, you may extend this special
 #   exception to the GPL to apply to your modified version as well.

-#serial 3
+#serial 4

 AC_DEFUN([AX_CHECK_COMPILE_FLAG],
-[AC_PREREQ(2.59)dnl for _AC_LANG_PREFIX
+[AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_IF
 AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_[]_AC_LANG_ABBREV[]flags_$4_$1])dnl
 AC_CACHE_CHECK([whether _AC_LANG compiler accepts $1], CACHEVAR, [
  ax_check_save_flags=$[]_AC_LANG_PREFIX[]FLAGS
@@ -67,7 +67,7 @@ AC_CACHE_CHECK([whether _AC_LANG compiler accepts $1], CACHEVAR, [
    [AS_VAR_SET(CACHEVAR,[yes])],
    [AS_VAR_SET(CACHEVAR,[no])])
  _AC_LANG_PREFIX[]FLAGS=$ax_check_save_flags])
-AS_IF([test x"AS_VAR_GET(CACHEVAR)" = xyes],
+AS_VAR_IF(CACHEVAR,yes,
  [m4_default([$2], :)],
  [m4_default([$3], :)])
 AS_VAR_POPDEF([CACHEVAR])dnl
--- a/m4/ax_check_link_flag.m4
+++ b/m4/ax_check_link_flag.m4
@@ -55,10 +55,11 @@
 #   modified version of the Autoconf Macro, you may extend this special
 #   exception to the GPL to apply to your modified version as well.

-#serial 3
+#serial 4

 AC_DEFUN([AX_CHECK_LINK_FLAG],
-[AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_ldflags_$4_$1])dnl
+[AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_IF
+AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_ldflags_$4_$1])dnl
 AC_CACHE_CHECK([whether the linker accepts $1], CACHEVAR, [
  ax_check_save_flags=$LDFLAGS
  LDFLAGS="$LDFLAGS $4 $1"
@@ -66,7 +67,7 @@ AC_CACHE_CHECK([whether the linker accepts $1], CACHEVAR, [
    [AS_VAR_SET(CACHEVAR,[yes])],
    [AS_VAR_SET(CACHEVAR,[no])])
  LDFLAGS=$ax_check_save_flags])
-AS_IF([test x"AS_VAR_GET(CACHEVAR)" = xyes],
+AS_VAR_IF(CACHEVAR,yes,
  [m4_default([$2], :)],
  [m4_default([$3], :)])
 AS_VAR_POPDEF([CACHEVAR])dnl
--- a/m4/ax_cxx_compile_stdcxx.m4
+++ b/m4/ax_cxx_compile_stdcxx.m4
@@ -0,0 +1,564 @@
+# ===========================================================================
+#   http://www.gnu.org/software/autoconf-archive/ax_cxx_compile_stdcxx.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+#   AX_CXX_COMPILE_STDCXX(VERSION, [ext|noext], [mandatory|optional])
+#
+# DESCRIPTION
+#
+#   Check for baseline language coverage in the compiler for the specified
+#   version of the C++ standard.  If necessary, add switches to CXX and
+#   CXXCPP to enable support.  VERSION may be '11' (for the C++11 standard)
+#   or '14' (for the C++14 standard).
+#
+#   The second argument, if specified, indicates whether you insist on an
+#   extended mode (e.g. -std=gnu++11) or a strict conformance mode (e.g.
+#   -std=c++11).  If neither is specified, you get whatever works, with
+#   preference for an extended mode.
+#
+#   The third argument, if specified 'mandatory' or if left unspecified,
+#   indicates that baseline support for the specified C++ standard is
+#   required and that the macro should error out if no mode with that
+#   support is found.  If specified 'optional', then configuration proceeds
+#   regardless, after defining HAVE_CXX${VERSION} if and only if a
+#   supporting mode is found.
+#
+# LICENSE
+#
+#   Copyright (c) 2008 Benjamin Kosnik <bkoz@redhat.com>
+#   Copyright (c) 2012 Zack Weinberg <zackw@panix.com>
+#   Copyright (c) 2013 Roy Stogner <roystgnr@ices.utexas.edu>
+#   Copyright (c) 2014, 2015 Google Inc.; contributed by Alexey Sokolov <sokolov@google.com>
+#   Copyright (c) 2015 Paul Norman <penorman@mac.com>
+#   Copyright (c) 2015 Moritz Klammler <moritz@klammler.eu>
+#
+#   Copying and distribution of this file, with or without modification, are
+#   permitted in any medium without royalty provided the copyright notice
+#   and this notice are preserved.  This file is offered as-is, without any
+#   warranty.
+
+#serial 4
+
+dnl  This macro is based on the code from the AX_CXX_COMPILE_STDCXX_11 macro
+dnl  (serial version number 13).
+
+AC_DEFUN([AX_CXX_COMPILE_STDCXX], [dnl
+  m4_if([$1], [11], [],
+        [$1], [14], [],
+        [$1], [17], [m4_fatal([support for C++17 not yet implemented in AX_CXX_COMPILE_STDCXX])],
+        [m4_fatal([invalid first argument `$1' to AX_CXX_COMPILE_STDCXX])])dnl
+  m4_if([$2], [], [],
+        [$2], [ext], [],
+        [$2], [noext], [],
+        [m4_fatal([invalid second argument `$2' to AX_CXX_COMPILE_STDCXX])])dnl
+  m4_if([$3], [], [ax_cxx_compile_cxx$1_required=true],
+        [$3], [mandatory], [ax_cxx_compile_cxx$1_required=true],
+        [$3], [optional], [ax_cxx_compile_cxx$1_required=false],
+        [m4_fatal([invalid third argument `$3' to AX_CXX_COMPILE_STDCXX])])
+  AC_LANG_PUSH([C++])dnl
+  ac_success=no
+  AC_CACHE_CHECK(whether $CXX supports C++$1 features by default,
+  ax_cv_cxx_compile_cxx$1,
+  [AC_COMPILE_IFELSE([AC_LANG_SOURCE([_AX_CXX_COMPILE_STDCXX_testbody_$1])],
+    [ax_cv_cxx_compile_cxx$1=yes],
+    [ax_cv_cxx_compile_cxx$1=no])])
+  if test x$ax_cv_cxx_compile_cxx$1 = xyes; then
+    ac_success=yes
+  fi
+
+  m4_if([$2], [noext], [], [dnl
+  if test x$ac_success = xno; then
+    for switch in -std=gnu++$1 -std=gnu++0x; do
+      cachevar=AS_TR_SH([ax_cv_cxx_compile_cxx$1_$switch])
+      AC_CACHE_CHECK(whether $CXX supports C++$1 features with $switch,
+                     $cachevar,
+        [ac_save_CXX="$CXX"
+         CXX="$CXX $switch"
+         AC_COMPILE_IFELSE([AC_LANG_SOURCE([_AX_CXX_COMPILE_STDCXX_testbody_$1])],
+          [eval $cachevar=yes],
+          [eval $cachevar=no])
+         CXX="$ac_save_CXX"])
+      if eval test x\$$cachevar = xyes; then
+        CXX="$CXX $switch"
+        if test -n "$CXXCPP" ; then
+          CXXCPP="$CXXCPP $switch"
+        fi
+        ac_success=yes
+        break
+      fi
+    done
+  fi])
+
+  m4_if([$2], [ext], [], [dnl
+  if test x$ac_success = xno; then
+    dnl HP's aCC needs +std=c++11 according to:
+    dnl http://h21007.www2.hp.com/portal/download/files/unprot/aCxx/PDF_Release_Notes/769149-001.pdf
+    dnl Cray's crayCC needs "-h std=c++11"
+    for switch in -std=c++$1 -std=c++0x +std=c++$1 "-h std=c++$1"; do
+      cachevar=AS_TR_SH([ax_cv_cxx_compile_cxx$1_$switch])
+      AC_CACHE_CHECK(whether $CXX supports C++$1 features with $switch,
+                     $cachevar,
+        [ac_save_CXX="$CXX"
+         CXX="$CXX $switch"
+         AC_COMPILE_IFELSE([AC_LANG_SOURCE([_AX_CXX_COMPILE_STDCXX_testbody_$1])],
+          [eval $cachevar=yes],
+          [eval $cachevar=no])
+         CXX="$ac_save_CXX"])
+      if eval test x\$$cachevar = xyes; then
+        CXX="$CXX $switch"
+        if test -n "$CXXCPP" ; then
+          CXXCPP="$CXXCPP $switch"
+        fi
+        ac_success=yes
+        break
+      fi
+    done
+  fi])
+  AC_LANG_POP([C++])
+  if test x$ax_cxx_compile_cxx$1_required = xtrue; then
+    if test x$ac_success = xno; then
+      AC_MSG_ERROR([*** A compiler with support for C++$1 language features is required.])
+    fi
+  fi
+  if test x$ac_success = xno; then
+    HAVE_CXX$1=0
+    AC_MSG_NOTICE([No compiler with C++$1 support was found])
+  else
+    HAVE_CXX$1=1
+    AC_DEFINE(HAVE_CXX$1,1,
+              [define if the compiler supports basic C++$1 syntax])
+  fi
+  AC_SUBST(HAVE_CXX$1)
+])
+
+
+dnl  Test body for checking C++11 support
+
+m4_define([_AX_CXX_COMPILE_STDCXX_testbody_11],
+  _AX_CXX_COMPILE_STDCXX_testbody_new_in_11
+)
+
+
+dnl  Test body for checking C++14 support
+
+m4_define([_AX_CXX_COMPILE_STDCXX_testbody_14],
+  _AX_CXX_COMPILE_STDCXX_testbody_new_in_11
+  _AX_CXX_COMPILE_STDCXX_testbody_new_in_14
+)
+
+
+dnl  Tests for new features in C++11
+
+m4_define([_AX_CXX_COMPILE_STDCXX_testbody_new_in_11], [[
+
+// If the compiler admits that it is not ready for C++11, why torture it?
+// Hopefully, this will speed up the test.
+
+#ifndef __cplusplus
+
+#error "This is not a C++ compiler"
+
+#elif __cplusplus < 201103L
+
+#error "This is not a C++11 compiler"
+
+#else
+
+namespace cxx11
+{
+
+  namespace test_static_assert
+  {
+
+    template <typename T>
+    struct check
+    {
+      static_assert(sizeof(int) <= sizeof(T), "not big enough");
+    };
+
+  }
+
+  namespace test_final_override
+  {
+
+    struct Base
+    {
+      virtual void f() {}
+    };
+
+    struct Derived : public Base
+    {
+      virtual void f() override {}
+    };
+
+  }
+
+  namespace test_double_right_angle_brackets
+  {
+
+    template < typename T >
+    struct check {};
+
+    typedef check<void> single_type;
+    typedef check<check<void>> double_type;
+    typedef check<check<check<void>>> triple_type;
+    typedef check<check<check<check<void>>>> quadruple_type;
+
+  }
+
+  namespace test_decltype
+  {
+
+    int
+    f()
+    {
+      int a = 1;
+      decltype(a) b = 2;
+      return a + b;
+    }
+
+  }
+
+  namespace test_type_deduction
+  {
+
+    template < typename T1, typename T2 >
+    struct is_same
+    {
+      static const bool value = false;
+    };
+
+    template < typename T >
+    struct is_same<T, T>
+    {
+      static const bool value = true;
+    };
+
+    template < typename T1, typename T2 >
+    auto
+    add(T1 a1, T2 a2) -> decltype(a1 + a2)
+    {
+      return a1 + a2;
+    }
+
+    int
+    test(const int c, volatile int v)
+    {
+      static_assert(is_same<int, decltype(0)>::value == true, "");
+      static_assert(is_same<int, decltype(c)>::value == false, "");
+      static_assert(is_same<int, decltype(v)>::value == false, "");
+      auto ac = c;
+      auto av = v;
+      auto sumi = ac + av + 'x';
+      auto sumf = ac + av + 1.0;
+      static_assert(is_same<int, decltype(ac)>::value == true, "");
+      static_assert(is_same<int, decltype(av)>::value == true, "");
+      static_assert(is_same<int, decltype(sumi)>::value == true, "");
+      static_assert(is_same<int, decltype(sumf)>::value == false, "");
+      static_assert(is_same<int, decltype(add(c, v))>::value == true, "");
+      return (sumf > 0.0) ? sumi : add(c, v);
+    }
+
+  }
+
+  namespace test_noexcept
+  {
+
+    int f() { return 0; }
+    int g() noexcept { return 0; }
+
+    static_assert(noexcept(f()) == false, "");
+    static_assert(noexcept(g()) == true, "");
+
+  }
+
+  namespace test_constexpr
+  {
+
+    template < typename CharT >
+    unsigned long constexpr
+    strlen_c_r(const CharT *const s, const unsigned long acc) noexcept
+    {
+      return *s ? strlen_c_r(s + 1, acc + 1) : acc;
+    }
+
+    template < typename CharT >
+    unsigned long constexpr
+    strlen_c(const CharT *const s) noexcept
+    {
+      return strlen_c_r(s, 0UL);
+    }
+
+    static_assert(strlen_c("") == 0UL, "");
+    static_assert(strlen_c("1") == 1UL, "");
+    static_assert(strlen_c("example") == 7UL, "");
+    static_assert(strlen_c("another\0example") == 7UL, "");
+
+  }
+
+  namespace test_rvalue_references
+  {
+
+    template < int N >
+    struct answer
+    {
+      static constexpr int value = N;
+    };
+
+    answer<1> f(int&)       { return answer<1>(); }
+    answer<2> f(const int&) { return answer<2>(); }
+    answer<3> f(int&&)      { return answer<3>(); }
+
+    void
+    test()
+    {
+      int i = 0;
+      const int c = 0;
+      static_assert(decltype(f(i))::value == 1, "");
+      static_assert(decltype(f(c))::value == 2, "");
+      static_assert(decltype(f(0))::value == 3, "");
+    }
+
+  }
+
+  namespace test_uniform_initialization
+  {
+
+    struct test
+    {
+      static const int zero {};
+      static const int one {1};
+    };
+
+    static_assert(test::zero == 0, "");
+    static_assert(test::one == 1, "");
+
+  }
+
+  namespace test_lambdas
+  {
+
+    void
+    test1()
+    {
+      auto lambda1 = [](){};
+      auto lambda2 = lambda1;
+      lambda1();
+      lambda2();
+    }
+
+    int
+    test2()
+    {
+      auto a = [](int i, int j){ return i + j; }(1, 2);
+      auto b = []() -> int { return '0'; }();
+      auto c = [=](){ return a + b; }();
+      auto d = [&](){ return c; }();
+      auto e = [a, &b](int x) mutable {
+        const auto identity = [](int y){ return y; };
+        for (auto i = 0; i < a; ++i)
+          a += b--;
+        return x + identity(a + b);
+      }(0);
+      return a + b + c + d + e;
+    }
+
+    int
+    test3()
+    {
+      const auto nullary = [](){ return 0; };
+      const auto unary = [](int x){ return x; };
+      using nullary_t = decltype(nullary);
+      using unary_t = decltype(unary);
+      const auto higher1st = [](nullary_t f){ return f(); };
+      const auto higher2nd = [unary](nullary_t f1){
+        return [unary, f1](unary_t f2){ return f2(unary(f1())); };
+      };
+      return higher1st(nullary) + higher2nd(nullary)(unary);
+    }
+
+  }
+
+  namespace test_variadic_templates
+  {
+
+    template <int...>
+    struct sum;
+
+    template <int N0, int... N1toN>
+    struct sum<N0, N1toN...>
+    {
+      static constexpr auto value = N0 + sum<N1toN...>::value;
+    };
+
+    template <>
+    struct sum<>
+    {
+      static constexpr auto value = 0;
+    };
+
+    static_assert(sum<>::value == 0, "");
+    static_assert(sum<1>::value == 1, "");
+    static_assert(sum<23>::value == 23, "");
+    static_assert(sum<1, 2>::value == 3, "");
+    static_assert(sum<5, 5, 11>::value == 21, "");
+    static_assert(sum<2, 3, 5, 7, 11, 13>::value == 41, "");
+
+  }
+
+  // http://stackoverflow.com/questions/13728184/template-aliases-and-sfinae
+  // Clang 3.1 fails with headers of libstd++ 4.8.3 when using std::function
+  // because of this.
+  namespace test_template_alias_sfinae
+  {
+
+    struct foo {};
+
+    template<typename T>
+    using member = typename T::member_type;
+
+    template<typename T>
+    void func(...) {}
+
+    template<typename T>
+    void func(member<T>*) {}
+
+    void test();
+
+    void test() { func<foo>(0); }
+
+  }
+
+}  // namespace cxx11
+
+#endif  // __cplusplus >= 201103L
+
+]])
+
+
+dnl  Tests for new features in C++14
+
+m4_define([_AX_CXX_COMPILE_STDCXX_testbody_new_in_14], [[
+
+// If the compiler admits that it is not ready for C++14, why torture it?
+// Hopefully, this will speed up the test.
+
+#ifndef __cplusplus
+
+#error "This is not a C++ compiler"
+
+#elif __cplusplus < 201300L
+
+#error "This is not a C++14 compiler"
+
+#else
+
+namespace cxx14
+{
+
+  namespace test_polymorphic_lambdas
+  {
+
+    int
+    test()
+    {
+      const auto lambda = [](auto&&... args){
+        const auto istiny = [](auto x){
+          return (sizeof(x) == 1UL) ? 1 : 0;
+        };
+        const int aretiny[] = { istiny(args)... };
+        return aretiny[0];
+      };
+      return lambda(1, 1L, 1.0f, '1');
+    }
+
+  }
+
+  namespace test_binary_literals
+  {
+
+    constexpr auto ivii = 0b0000000000101010;
+    static_assert(ivii == 42, "wrong value");
+
+  }
+
+#ifdef DISALLOW_GCC48
+  namespace test_generalized_constexpr
+  {
+
+    template < typename CharT >
+    constexpr unsigned long
+    strlen_c(const CharT *const s) noexcept
+    {
+      auto length = 0UL;
+      for (auto p = s; *p; ++p)
+        ++length;
+      return length;
+    }
+
+    static_assert(strlen_c("") == 0UL, "");
+    static_assert(strlen_c("x") == 1UL, "");
+    static_assert(strlen_c("test") == 4UL, "");
+    static_assert(strlen_c("another\0test") == 7UL, "");
+
+  }
+#endif
+
+  namespace test_lambda_init_capture
+  {
+
+    int
+    test()
+    {
+      auto x = 0;
+      const auto lambda1 = [a = x](int b){ return a + b; };
+      const auto lambda2 = [a = lambda1(x)](){ return a; };
+      return lambda2();
+    }
+
+  }
+
+  namespace test_digit_seperators
+  {
+
+    constexpr auto ten_million = 100'000'000;
+    static_assert(ten_million == 100000000, "");
+
+  }
+
+  namespace test_return_type_deduction
+  {
+
+    auto f(int& x) { return x; }
+    decltype(auto) g(int& x) { return x; }
+
+    template < typename T1, typename T2 >
+    struct is_same
+    {
+      static constexpr auto value = false;
+    };
+
+    template < typename T >
+    struct is_same<T, T>
+    {
+      static constexpr auto value = true;
+    };
+
+    int
+    test()
+    {
+      auto x = 0;
+      static_assert(is_same<int, decltype(f(x))>::value, "");
+      static_assert(is_same<int&, decltype(g(x))>::value, "");
+      return x;
+    }
+
+  }
+
+}  // namespace cxx14
+
+#endif  // __cplusplus >= 201402L
+
+]])
--- a/m4/ax_cxx_compile_stdcxx_0x.m4
+++ b/m4/ax_cxx_compile_stdcxx_0x.m4
@@ -1,107 +0,0 @@
-# ============================================================================
-#  http://www.gnu.org/software/autoconf-archive/ax_cxx_compile_stdcxx_0x.html
-# ============================================================================
-#
-# SYNOPSIS
-#
-#   AX_CXX_COMPILE_STDCXX_0X
-#
-# DESCRIPTION
-#
-#   Check for baseline language coverage in the compiler for the C++0x
-#   standard.
-#
-# LICENSE
-#
-#   Copyright (c) 2008 Benjamin Kosnik <bkoz@redhat.com>
-#
-#   Copying and distribution of this file, with or without modification, are
-#   permitted in any medium without royalty provided the copyright notice
-#   and this notice are preserved. This file is offered as-is, without any
-#   warranty.
-
-#serial 7
-
-AU_ALIAS([AC_CXX_COMPILE_STDCXX_0X], [AX_CXX_COMPILE_STDCXX_0X])
-AC_DEFUN([AX_CXX_COMPILE_STDCXX_0X], [
-  AC_CACHE_CHECK(if g++ supports C++0x features without additional flags,
-  ax_cv_cxx_compile_cxx0x_native,
-  [AC_LANG_SAVE
-  AC_LANG_CPLUSPLUS
-  AC_TRY_COMPILE([
-  template <typename T>
-    struct check
-    {
-      static_assert(sizeof(int) <= sizeof(T), "not big enough");
-    };
-
-    typedef check<check<bool>> right_angle_brackets;
-
-    int a;
-    decltype(a) b;
-
-    typedef check<int> check_type;
-    check_type c;
-    check_type&& cr = static_cast<check_type&&>(c);],,
-  ax_cv_cxx_compile_cxx0x_native=yes, ax_cv_cxx_compile_cxx0x_native=no)
-  AC_LANG_RESTORE
-  ])
-
-  AC_CACHE_CHECK(if g++ supports C++0x features with -std=c++0x,
-  ax_cv_cxx_compile_cxx0x_cxx,
-  [AC_LANG_SAVE
-  AC_LANG_CPLUSPLUS
-  ac_save_CXXFLAGS="$CXXFLAGS"
-  CXXFLAGS="$CXXFLAGS -std=c++0x"
-  AC_TRY_COMPILE([
-  template <typename T>
-    struct check
-    {
-      static_assert(sizeof(int) <= sizeof(T), "not big enough");
-    };
-
-    typedef check<check<bool>> right_angle_brackets;
-
-    int a;
-    decltype(a) b;
-
-    typedef check<int> check_type;
-    check_type c;
-    check_type&& cr = static_cast<check_type&&>(c);],,
-  ax_cv_cxx_compile_cxx0x_cxx=yes, ax_cv_cxx_compile_cxx0x_cxx=no)
-  CXXFLAGS="$ac_save_CXXFLAGS"
-  AC_LANG_RESTORE
-  ])
-
-  AC_CACHE_CHECK(if g++ supports C++0x features with -std=gnu++0x,
-  ax_cv_cxx_compile_cxx0x_gxx,
-  [AC_LANG_SAVE
-  AC_LANG_CPLUSPLUS
-  ac_save_CXXFLAGS="$CXXFLAGS"
-  CXXFLAGS="$CXXFLAGS -std=gnu++0x"
-  AC_TRY_COMPILE([
-  template <typename T>
-    struct check
-    {
-      static_assert(sizeof(int) <= sizeof(T), "not big enough");
-    };
-
-    typedef check<check<bool>> right_angle_brackets;
-
-    int a;
-    decltype(a) b;
-
-    typedef check<int> check_type;
-    check_type c;
-    check_type&& cr = static_cast<check_type&&>(c);],,
-  ax_cv_cxx_compile_cxx0x_gxx=yes, ax_cv_cxx_compile_cxx0x_gxx=no)
-  CXXFLAGS="$ac_save_CXXFLAGS"
-  AC_LANG_RESTORE
-  ])
-
-  if test "$ax_cv_cxx_compile_cxx0x_native" = yes ||
-     test "$ax_cv_cxx_compile_cxx0x_cxx" = yes ||
-     test "$ax_cv_cxx_compile_cxx0x_gxx" = yes; then
-    AC_DEFINE(HAVE_STDCXX_0X,,[Define if g++ supports C++0x features. ])
-  fi
-])
--- a/m4/ax_cxx_compile_stdcxx_14.m4
+++ b/m4/ax_cxx_compile_stdcxx_14.m4
@@ -0,0 +1,34 @@
+# ============================================================================
+#  http://www.gnu.org/software/autoconf-archive/ax_cxx_compile_stdcxx_14.html
+# ============================================================================
+#
+# SYNOPSIS
+#
+#   AX_CXX_COMPILE_STDCXX_14([ext|noext], [mandatory|optional])
+#
+# DESCRIPTION
+#
+#   Check for baseline language coverage in the compiler for the C++14
+#   standard; if necessary, add switches to CXX and CXXCPP to enable
+#   support.
+#
+#   This macro is a convenience alias for calling the AX_CXX_COMPILE_STDCXX
+#   macro with the version set to C++14.  The two optional arguments are
+#   forwarded literally as the second and third argument respectively.
+#   Please see the documentation for the AX_CXX_COMPILE_STDCXX macro for
+#   more information.  If you want to use this macro, you also need to
+#   download the ax_cxx_compile_stdcxx.m4 file.
+#
+# LICENSE
+#
+#   Copyright (c) 2015 Moritz Klammler <moritz@klammler.eu>
+#
+#   Copying and distribution of this file, with or without modification, are
+#   permitted in any medium without royalty provided the copyright notice
+#   and this notice are preserved. This file is offered as-is, without any
+#   warranty.
+
+#serial 4
+
+AX_REQUIRE_DEFINED([AX_CXX_COMPILE_STDCXX])
+AC_DEFUN([AX_CXX_COMPILE_STDCXX_14], [AX_CXX_COMPILE_STDCXX([14], [$1], [$2])])
--- a/m4/ax_pthread.m4
+++ b/m4/ax_pthread.m4
@@ -19,10 +19,10 @@
 #   is necessary on AIX to use the special cc_r compiler alias.)
 #
 #   NOTE: You are assumed to not only compile your program with these flags,
-#   but also link it with them as well. e.g. you should link with
+#   but also to link with them as well. For example, you might link with
 #   $PTHREAD_CC $CFLAGS $PTHREAD_CFLAGS $LDFLAGS ... $PTHREAD_LIBS $LIBS
 #
-#   If you are only building threads programs, you may wish to use these
+#   If you are only building threaded programs, you may wish to use these
 #   variables in your default LIBS, CFLAGS, and CC:
 #
 #     LIBS="$PTHREAD_LIBS $LIBS"
@@ -30,8 +30,8 @@
 #     CC="$PTHREAD_CC"
 #
 #   In addition, if the PTHREAD_CREATE_JOINABLE thread-attribute constant
-#   has a nonstandard name, defines PTHREAD_CREATE_JOINABLE to that name
-#   (e.g. PTHREAD_CREATE_UNDETACHED on AIX).
+#   has a nonstandard name, this macro defines PTHREAD_CREATE_JOINABLE to
+#   that name (e.g. PTHREAD_CREATE_UNDETACHED on AIX).
 #
 #   Also HAVE_PTHREAD_PRIO_INHERIT is defined if pthread is found and the
 #   PTHREAD_PRIO_INHERIT symbol is defined when compiling with
@@ -82,35 +82,40 @@
 #   modified version of the Autoconf Macro, you may extend this special
 #   exception to the GPL to apply to your modified version as well.

-#serial 21
+#serial 23

 AU_ALIAS([ACX_PTHREAD], [AX_PTHREAD])
 AC_DEFUN([AX_PTHREAD], [
 AC_REQUIRE([AC_CANONICAL_HOST])
+AC_REQUIRE([AC_PROG_CC])
+AC_REQUIRE([AC_PROG_SED])
 AC_LANG_PUSH([C])
 ax_pthread_ok=no

 # We used to check for pthread.h first, but this fails if pthread.h
-# requires special compiler flags (e.g. on True64 or Sequent).
+# requires special compiler flags (e.g. on Tru64 or Sequent).
 # It gets checked for in the link test anyway.

 # First of all, check if the user has set any of the PTHREAD_LIBS,
 # etcetera environment variables, and if threads linking works using
 # them:
-if test x"$PTHREAD_LIBS$PTHREAD_CFLAGS" != x; then
-        save_CFLAGS="$CFLAGS"
+if test "x$PTHREAD_CFLAGS$PTHREAD_LIBS" != "x"; then
+        ax_pthread_save_CC="$CC"
+        ax_pthread_save_CFLAGS="$CFLAGS"
+        ax_pthread_save_LIBS="$LIBS"
+        AS_IF([test "x$PTHREAD_CC" != "x"], [CC="$PTHREAD_CC"])
        CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
-        save_LIBS="$LIBS"
        LIBS="$PTHREAD_LIBS $LIBS"
-        AC_MSG_CHECKING([for pthread_join in LIBS=$PTHREAD_LIBS with CFLAGS=$PTHREAD_CFLAGS])
-        AC_TRY_LINK_FUNC([pthread_join], [ax_pthread_ok=yes])
+        AC_MSG_CHECKING([for pthread_join using $CC $PTHREAD_CFLAGS $PTHREAD_LIBS])
+        AC_LINK_IFELSE([AC_LANG_CALL([], [pthread_join])], [ax_pthread_ok=yes])
        AC_MSG_RESULT([$ax_pthread_ok])
-        if test x"$ax_pthread_ok" = xno; then
+        if test "x$ax_pthread_ok" = "xno"; then
                PTHREAD_LIBS=""
                PTHREAD_CFLAGS=""
        fi
-        LIBS="$save_LIBS"
-        CFLAGS="$save_CFLAGS"
+        CC="$ax_pthread_save_CC"
+        CFLAGS="$ax_pthread_save_CFLAGS"
+        LIBS="$ax_pthread_save_LIBS"
 fi

 # We must check for the threads library under a number of different
@@ -123,7 +128,7 @@ fi
 # which indicates that we try without any flags at all, and "pthread-config"
 # which is a program returning the flags for the Pth emulation library.

-ax_pthread_flags="pthreads none -Kthread -kthread lthread -pthread -pthreads -mthreads pthread --thread-safe -mt pthread-config"
+ax_pthread_flags="pthreads none -Kthread -pthread -pthreads -mthreads pthread --thread-safe -mt pthread-config"

 # The ordering *is* (sometimes) important.  Some notes on the
 # individual items follow:
@@ -132,82 +137,225 @@ ax_pthread_flags="pthreads none -Kthread -kthread lthread -pthread -pthreads -mt
 # none: in case threads are in libc; should be tried before -Kthread and
 #       other compiler flags to prevent continual compiler warnings
 # -Kthread: Sequent (threads in libc, but -Kthread needed for pthread.h)
-# -kthread: FreeBSD kernel threads (preferred to -pthread since SMP-able)
-# lthread: LinuxThreads port on FreeBSD (also preferred to -pthread)
-# -pthread: Linux/gcc (kernel threads), BSD/gcc (userland threads)
-# -pthreads: Solaris/gcc
-# -mthreads: Mingw32/gcc, Lynx/gcc
+# -pthread: Linux/gcc (kernel threads), BSD/gcc (userland threads), Tru64
+#           (Note: HP C rejects this with "bad form for `-t' option")
+# -pthreads: Solaris/gcc (Note: HP C also rejects)
 # -mt: Sun Workshop C (may only link SunOS threads [-lthread], but it
-#      doesn't hurt to check since this sometimes defines pthreads too;
-#      also defines -D_REENTRANT)
-#      ... -mt is also the pthreads flag for HP/aCC
+#      doesn't hurt to check since this sometimes defines pthreads and
+#      -D_REENTRANT too), HP C (must be checked before -lpthread, which
+#      is present but should not be used directly; and before -mthreads,
+#      because the compiler interprets this as "-mt" + "-hreads")
+# -mthreads: Mingw32/gcc, Lynx/gcc
 # pthread: Linux, etcetera
 # --thread-safe: KAI C++
 # pthread-config: use pthread-config program (for GNU Pth library)

-case ${host_os} in
+case $host_os in
+
+        freebsd*)
+
+        # -kthread: FreeBSD kernel threads (preferred to -pthread since SMP-able)
+        # lthread: LinuxThreads port on FreeBSD (also preferred to -pthread)
+
+        ax_pthread_flags="-kthread lthread $ax_pthread_flags"
+        ;;
+
+        hpux*)
+
+        # From the cc(1) man page: "[-mt] Sets various -D flags to enable
+        # multi-threading and also sets -lpthread."
+
+        ax_pthread_flags="-mt -pthread pthread $ax_pthread_flags"
+        ;;
+
+        openedition*)
+
+        # IBM z/OS requires a feature-test macro to be defined in order to
+        # enable POSIX threads at all, so give the user a hint if this is
+        # not set. (We don't define these ourselves, as they can affect
+        # other portions of the system API in unpredictable ways.)
+
+        AC_EGREP_CPP([AX_PTHREAD_ZOS_MISSING],
+            [
+#            if !defined(_OPEN_THREADS) && !defined(_UNIX03_THREADS)
+             AX_PTHREAD_ZOS_MISSING
+#            endif
+            ],
+            [AC_MSG_WARN([IBM z/OS requires -D_OPEN_THREADS or -D_UNIX03_THREADS to enable pthreads support.])])
+        ;;
+
        solaris*)

        # On Solaris (at least, for some versions), libc contains stubbed
        # (non-functional) versions of the pthreads routines, so link-based
-        # tests will erroneously succeed.  (We need to link with -pthreads/-mt/
-        # -lpthread.)  (The stubs are missing pthread_cleanup_push, or rather
-        # a function called by this macro, so we could check for that, but
-        # who knows whether they'll stub that too in a future libc.)  So,
-        # we'll just look for -pthreads and -lpthread first:
+        # tests will erroneously succeed. (N.B.: The stubs are missing
+        # pthread_cleanup_push, or rather a function called by this macro,
+        # so we could check for that, but who knows whether they'll stub
+        # that too in a future libc.)  So we'll check first for the
+        # standard Solaris way of linking pthreads (-mt -lpthread).

-        ax_pthread_flags="-pthreads pthread -mt -pthread $ax_pthread_flags"
-        ;;
-
-        darwin*)
-        ax_pthread_flags="-pthread $ax_pthread_flags"
+        ax_pthread_flags="-mt,pthread pthread $ax_pthread_flags"
        ;;
 esac

-# Clang doesn't consider unrecognized options an error unless we specify
-# -Werror. We throw in some extra Clang-specific options to ensure that
-# this doesn't happen for GCC, which also accepts -Werror.
+# GCC generally uses -pthread, or -pthreads on some platforms (e.g. SPARC)

-AC_MSG_CHECKING([if compiler needs -Werror to reject unknown flags])
-save_CFLAGS="$CFLAGS"
-ax_pthread_extra_flags="-Werror"
-CFLAGS="$CFLAGS $ax_pthread_extra_flags -Wunknown-warning-option -Wsizeof-array-argument"
-AC_COMPILE_IFELSE([AC_LANG_PROGRAM([int foo(void);],[foo()])],
-                  [AC_MSG_RESULT([yes])],
-                  [ax_pthread_extra_flags=
-                   AC_MSG_RESULT([no])])
-CFLAGS="$save_CFLAGS"
+AS_IF([test "x$GCC" = "xyes"],
+      [ax_pthread_flags="-pthread -pthreads $ax_pthread_flags"])

-if test x"$ax_pthread_ok" = xno; then
-for flag in $ax_pthread_flags; do
+# The presence of a feature test macro requesting re-entrant function
+# definitions is, on some systems, a strong hint that pthreads support is
+# correctly enabled

-        case $flag in
+case $host_os in
+        darwin* | hpux* | linux* | osf* | solaris*)
+        ax_pthread_check_macro="_REENTRANT"
+        ;;
+
+        aix*)
+        ax_pthread_check_macro="_THREAD_SAFE"
+        ;;
+
+        *)
+        ax_pthread_check_macro="--"
+        ;;
+esac
+AS_IF([test "x$ax_pthread_check_macro" = "x--"],
+      [ax_pthread_check_cond=0],
+      [ax_pthread_check_cond="!defined($ax_pthread_check_macro)"])
+
+# Are we compiling with Clang?
+
+AC_CACHE_CHECK([whether $CC is Clang],
+    [ax_cv_PTHREAD_CLANG],
+    [ax_cv_PTHREAD_CLANG=no
+     # Note that Autoconf sets GCC=yes for Clang as well as GCC
+     if test "x$GCC" = "xyes"; then
+        AC_EGREP_CPP([AX_PTHREAD_CC_IS_CLANG],
+            [/* Note: Clang 2.7 lacks __clang_[a-z]+__ */
+#            if defined(__clang__) && defined(__llvm__)
+             AX_PTHREAD_CC_IS_CLANG
+#            endif
+            ],
+            [ax_cv_PTHREAD_CLANG=yes])
+     fi
+    ])
+ax_pthread_clang="$ax_cv_PTHREAD_CLANG"
+
+ax_pthread_clang_warning=no
+
+# Clang needs special handling, because older versions handle the -pthread
+# option in a rather... idiosyncratic way
+
+if test "x$ax_pthread_clang" = "xyes"; then
+
+        # Clang takes -pthread; it has never supported any other flag
+
+        # (Note 1: This will need to be revisited if a system that Clang
+        # supports has POSIX threads in a separate library.  This tends not
+        # to be the way of modern systems, but it's conceivable.)
+
+        # (Note 2: On some systems, notably Darwin, -pthread is not needed
+        # to get POSIX threads support; the API is always present and
+        # active.  We could reasonably leave PTHREAD_CFLAGS empty.  But
+        # -pthread does define _REENTRANT, and while the Darwin headers
+        # ignore this macro, third-party headers might not.)
+
+        PTHREAD_CFLAGS="-pthread"
+        PTHREAD_LIBS=
+
+        ax_pthread_ok=yes
+
+        # However, older versions of Clang make a point of warning the user
+        # that, in an invocation where only linking and no compilation is
+        # taking place, the -pthread option has no effect ("argument unused
+        # during compilation").  They expect -pthread to be passed in only
+        # when source code is being compiled.
+        #
+        # Problem is, this is at odds with the way Automake and most other
+        # C build frameworks function, which is that the same flags used in
+        # compilation (CFLAGS) are also used in linking.  Many systems
+        # supported by AX_PTHREAD require exactly this for POSIX threads
+        # support, and in fact it is often not straightforward to specify a
+        # flag that is used only in the compilation phase and not in
+        # linking.  Such a scenario is extremely rare in practice.
+        #
+        # Even though use of the -pthread flag in linking would only print
+        # a warning, this can be a nuisance for well-run software projects
+        # that build with -Werror.  So if the active version of Clang has
+        # this misfeature, we search for an option to squash it.
+
+        AC_CACHE_CHECK([whether Clang needs flag to prevent "argument unused" warning when linking with -pthread],
+            [ax_cv_PTHREAD_CLANG_NO_WARN_FLAG],
+            [ax_cv_PTHREAD_CLANG_NO_WARN_FLAG=unknown
+             # Create an alternate version of $ac_link that compiles and
+             # links in two steps (.c -> .o, .o -> exe) instead of one
+             # (.c -> exe), because the warning occurs only in the second
+             # step
+             ax_pthread_save_ac_link="$ac_link"
+             ax_pthread_sed='s/conftest\.\$ac_ext/conftest.$ac_objext/g'
+             ax_pthread_link_step=`$as_echo "$ac_link" | sed "$ax_pthread_sed"`
+             ax_pthread_2step_ac_link="($ac_compile) && (echo ==== >&5) && ($ax_pthread_link_step)"
+             ax_pthread_save_CFLAGS="$CFLAGS"
+             for ax_pthread_try in '' -Qunused-arguments -Wno-unused-command-line-argument unknown; do
+                AS_IF([test "x$ax_pthread_try" = "xunknown"], [break])
+                CFLAGS="-Werror -Wunknown-warning-option $ax_pthread_try -pthread $ax_pthread_save_CFLAGS"
+                ac_link="$ax_pthread_save_ac_link"
+                AC_LINK_IFELSE([AC_LANG_SOURCE([[int main(void){return 0;}]])],
+                    [ac_link="$ax_pthread_2step_ac_link"
+                     AC_LINK_IFELSE([AC_LANG_SOURCE([[int main(void){return 0;}]])],
+                         [break])
+                    ])
+             done
+             ac_link="$ax_pthread_save_ac_link"
+             CFLAGS="$ax_pthread_save_CFLAGS"
+             AS_IF([test "x$ax_pthread_try" = "x"], [ax_pthread_try=no])
+             ax_cv_PTHREAD_CLANG_NO_WARN_FLAG="$ax_pthread_try"
+            ])
+
+        case "$ax_cv_PTHREAD_CLANG_NO_WARN_FLAG" in
+                no | unknown) ;;
+                *) PTHREAD_CFLAGS="$ax_cv_PTHREAD_CLANG_NO_WARN_FLAG $PTHREAD_CFLAGS" ;;
+        esac
+
+fi # $ax_pthread_clang = yes
+
+if test "x$ax_pthread_ok" = "xno"; then
+for ax_pthread_try_flag in $ax_pthread_flags; do
+
+        case $ax_pthread_try_flag in
                none)
                AC_MSG_CHECKING([whether pthreads work without any flags])
                ;;

+                -mt,pthread)
+                AC_MSG_CHECKING([whether pthreads work with -mt -lpthread])
+                PTHREAD_CFLAGS="-mt"
+                PTHREAD_LIBS="-lpthread"
+                ;;
+
                -*)
-                AC_MSG_CHECKING([whether pthreads work with $flag])
-                PTHREAD_CFLAGS="$flag"
+                AC_MSG_CHECKING([whether pthreads work with $ax_pthread_try_flag])
+                PTHREAD_CFLAGS="$ax_pthread_try_flag"
                ;;

                pthread-config)
                AC_CHECK_PROG([ax_pthread_config], [pthread-config], [yes], [no])
-                if test x"$ax_pthread_config" = xno; then continue; fi
+                AS_IF([test "x$ax_pthread_config" = "xno"], [continue])
                PTHREAD_CFLAGS="`pthread-config --cflags`"
                PTHREAD_LIBS="`pthread-config --ldflags` `pthread-config --libs`"
                ;;

                *)
-                AC_MSG_CHECKING([for the pthreads library -l$flag])
-                PTHREAD_LIBS="-l$flag"
+                AC_MSG_CHECKING([for the pthreads library -l$ax_pthread_try_flag])
+                PTHREAD_LIBS="-l$ax_pthread_try_flag"
                ;;
        esac

-        save_LIBS="$LIBS"
-        save_CFLAGS="$CFLAGS"
+        ax_pthread_save_CFLAGS="$CFLAGS"
+        ax_pthread_save_LIBS="$LIBS"
+        CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
        LIBS="$PTHREAD_LIBS $LIBS"
-        CFLAGS="$CFLAGS $PTHREAD_CFLAGS $ax_pthread_extra_flags"

        # Check for various functions.  We must include pthread.h,
        # since some functions may be macros.  (On the Sequent, we
@@ -218,7 +366,11 @@ for flag in $ax_pthread_flags; do
        # pthread_cleanup_push because it is one of the few pthread
        # functions on Solaris that doesn't have a non-functional libc stub.
        # We try pthread_create on general principles.
+
        AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <pthread.h>
+#                       if $ax_pthread_check_cond
+#                        error "$ax_pthread_check_macro must be defined"
+#                       endif
                        static void routine(void *a) { a = 0; }
                        static void *start_routine(void *a) { return a; }],
                       [pthread_t th; pthread_attr_t attr;
@@ -227,16 +379,14 @@ for flag in $ax_pthread_flags; do
                        pthread_attr_init(&attr);
                        pthread_cleanup_push(routine, 0);
                        pthread_cleanup_pop(0) /* ; */])],
-                [ax_pthread_ok=yes],
-                [])
+            [ax_pthread_ok=yes],
+            [])

-        LIBS="$save_LIBS"
-        CFLAGS="$save_CFLAGS"
+        CFLAGS="$ax_pthread_save_CFLAGS"
+        LIBS="$ax_pthread_save_LIBS"

        AC_MSG_RESULT([$ax_pthread_ok])
-        if test "x$ax_pthread_ok" = xyes; then
-                break;
-        fi
+        AS_IF([test "x$ax_pthread_ok" = "xyes"], [break])

        PTHREAD_LIBS=""
        PTHREAD_CFLAGS=""
@@ -244,71 +394,74 @@ done
 fi

 # Various other checks:
-if test "x$ax_pthread_ok" = xyes; then
-        save_LIBS="$LIBS"
-        LIBS="$PTHREAD_LIBS $LIBS"
-        save_CFLAGS="$CFLAGS"
+if test "x$ax_pthread_ok" = "xyes"; then
+        ax_pthread_save_CFLAGS="$CFLAGS"
+        ax_pthread_save_LIBS="$LIBS"
        CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
+        LIBS="$PTHREAD_LIBS $LIBS"

        # Detect AIX lossage: JOINABLE attribute is called UNDETACHED.
-        AC_MSG_CHECKING([for joinable pthread attribute])
-        attr_name=unknown
-        for attr in PTHREAD_CREATE_JOINABLE PTHREAD_CREATE_UNDETACHED; do
-            AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <pthread.h>],
-                           [int attr = $attr; return attr /* ; */])],
-                [attr_name=$attr; break],
-                [])
-        done
-        AC_MSG_RESULT([$attr_name])
-        if test "$attr_name" != PTHREAD_CREATE_JOINABLE; then
-            AC_DEFINE_UNQUOTED([PTHREAD_CREATE_JOINABLE], [$attr_name],
-                               [Define to necessary symbol if this constant
-                                uses a non-standard name on your system.])
-        fi
+        AC_CACHE_CHECK([for joinable pthread attribute],
+            [ax_cv_PTHREAD_JOINABLE_ATTR],
+            [ax_cv_PTHREAD_JOINABLE_ATTR=unknown
+             for ax_pthread_attr in PTHREAD_CREATE_JOINABLE PTHREAD_CREATE_UNDETACHED; do
+                 AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <pthread.h>],
+                                                 [int attr = $ax_pthread_attr; return attr /* ; */])],
+                                [ax_cv_PTHREAD_JOINABLE_ATTR=$ax_pthread_attr; break],
+                                [])
+             done
+            ])
+        AS_IF([test "x$ax_cv_PTHREAD_JOINABLE_ATTR" != "xunknown" && \
+               test "x$ax_cv_PTHREAD_JOINABLE_ATTR" != "xPTHREAD_CREATE_JOINABLE" && \
+               test "x$ax_pthread_joinable_attr_defined" != "xyes"],
+              [AC_DEFINE_UNQUOTED([PTHREAD_CREATE_JOINABLE],
+                                  [$ax_cv_PTHREAD_JOINABLE_ATTR],
+                                  [Define to necessary symbol if this constant
+                                   uses a non-standard name on your system.])
+               ax_pthread_joinable_attr_defined=yes
+              ])

-        AC_MSG_CHECKING([if more special flags are required for pthreads])
-        flag=no
-        case ${host_os} in
-            aix* | freebsd* | darwin*) flag="-D_THREAD_SAFE";;
-            osf* | hpux*) flag="-D_REENTRANT";;
-            solaris*)
-            if test "$GCC" = "yes"; then
-                flag="-D_REENTRANT"
-            else
-                # TODO: What about Clang on Solaris?
-                flag="-mt -D_REENTRANT"
-            fi
-            ;;
-        esac
-        AC_MSG_RESULT([$flag])
-        if test "x$flag" != xno; then
-            PTHREAD_CFLAGS="$flag $PTHREAD_CFLAGS"
-        fi
+        AC_CACHE_CHECK([whether more special flags are required for pthreads],
+            [ax_cv_PTHREAD_SPECIAL_FLAGS],
+            [ax_cv_PTHREAD_SPECIAL_FLAGS=no
+             case $host_os in
+             solaris*)
+             ax_cv_PTHREAD_SPECIAL_FLAGS="-D_POSIX_PTHREAD_SEMANTICS"
+             ;;
+             esac
+            ])
+        AS_IF([test "x$ax_cv_PTHREAD_SPECIAL_FLAGS" != "xno" && \
+               test "x$ax_pthread_special_flags_added" != "xyes"],
+              [PTHREAD_CFLAGS="$ax_cv_PTHREAD_SPECIAL_FLAGS $PTHREAD_CFLAGS"
+               ax_pthread_special_flags_added=yes])

        AC_CACHE_CHECK([for PTHREAD_PRIO_INHERIT],
-            [ax_cv_PTHREAD_PRIO_INHERIT], [
-                AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <pthread.h>]],
-                                                [[int i = PTHREAD_PRIO_INHERIT;]])],
-                    [ax_cv_PTHREAD_PRIO_INHERIT=yes],
-                    [ax_cv_PTHREAD_PRIO_INHERIT=no])
+            [ax_cv_PTHREAD_PRIO_INHERIT],
+            [AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <pthread.h>]],
+                                             [[int i = PTHREAD_PRIO_INHERIT;]])],
+                            [ax_cv_PTHREAD_PRIO_INHERIT=yes],
+                            [ax_cv_PTHREAD_PRIO_INHERIT=no])
            ])
-        AS_IF([test "x$ax_cv_PTHREAD_PRIO_INHERIT" = "xyes"],
-            [AC_DEFINE([HAVE_PTHREAD_PRIO_INHERIT], [1], [Have PTHREAD_PRIO_INHERIT.])])
+        AS_IF([test "x$ax_cv_PTHREAD_PRIO_INHERIT" = "xyes" && \
+               test "x$ax_pthread_prio_inherit_defined" != "xyes"],
+              [AC_DEFINE([HAVE_PTHREAD_PRIO_INHERIT], [1], [Have PTHREAD_PRIO_INHERIT.])
+               ax_pthread_prio_inherit_defined=yes
+              ])

-        LIBS="$save_LIBS"
-        CFLAGS="$save_CFLAGS"
+        CFLAGS="$ax_pthread_save_CFLAGS"
+        LIBS="$ax_pthread_save_LIBS"

        # More AIX lossage: compile with *_r variant
-        if test "x$GCC" != xyes; then
+        if test "x$GCC" != "xyes"; then
            case $host_os in
                aix*)
                AS_CASE(["x/$CC"],
-                  [x*/c89|x*/c89_128|x*/c99|x*/c99_128|x*/cc|x*/cc128|x*/xlc|x*/xlc_v6|x*/xlc128|x*/xlc128_v6],
-                  [#handle absolute path differently from PATH based program lookup
-                   AS_CASE(["x$CC"],
-                     [x/*],
-                     [AS_IF([AS_EXECUTABLE_P([${CC}_r])],[PTHREAD_CC="${CC}_r"])],
-                     [AC_CHECK_PROGS([PTHREAD_CC],[${CC}_r],[$CC])])])
+                    [x*/c89|x*/c89_128|x*/c99|x*/c99_128|x*/cc|x*/cc128|x*/xlc|x*/xlc_v6|x*/xlc128|x*/xlc128_v6],
+                    [#handle absolute path differently from PATH based program lookup
+                     AS_CASE(["x$CC"],
+                         [x/*],
+                         [AS_IF([AS_EXECUTABLE_P([${CC}_r])],[PTHREAD_CC="${CC}_r"])],
+                         [AC_CHECK_PROGS([PTHREAD_CC],[${CC}_r],[$CC])])])
                ;;
            esac
        fi
@@ -321,7 +474,7 @@ AC_SUBST([PTHREAD_CFLAGS])
 AC_SUBST([PTHREAD_CC])

 # Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND:
-if test x"$ax_pthread_ok" = xyes; then
+if test "x$ax_pthread_ok" = "xyes"; then
        ifelse([$1],,[AC_DEFINE([HAVE_PTHREAD],[1],[Define if you have POSIX threads libraries and header files.])],[$1])
        :
 else
--- a/m4/faad.m4
+++ b/m4/faad.m4
@@ -1,73 +0,0 @@
-AC_DEFUN([AM_PATH_FAAD],
-[dnl ##
-dnl faad
-dnl ##
-
-AC_ARG_ENABLE(aac,
-	AS_HELP_STRING([--disable-aac],
-		[disable AAC support (default: enable)]),,
-	enable_aac=yes)
-
-if test x$enable_aac = xyes; then
-	FAAD_LIBS="-lfaad"
-	FAAD_CFLAGS=""
-
-	oldcflags=$CFLAGS
-	oldlibs=$LIBS
-	oldcppflags=$CPPFLAGS
-	CFLAGS="$CFLAGS $FAAD_CFLAGS"
-	LIBS="$LIBS $FAAD_LIBS"
-	CPPFLAGS=$CFLAGS
-	AC_CHECK_HEADER(faad.h,,enable_aac=no)
-	if test x$enable_aac = xyes; then
-		AC_CHECK_DECL(FAAD2_VERSION,,enable_aac=no,[#include <faad.h>])
-	fi
-	if test x$enable_aac = xyes; then
-		AC_CHECK_LIB(faad,NeAACDecInit2,,enable_aac=no)
-	fi
-	if test x$enable_aac = xyes; then
-		AC_MSG_CHECKING(that FAAD2 can even be used)
-		AC_COMPILE_IFELSE([AC_LANG_SOURCE([
-#include <faad.h>
-
-int main() {
-	char buffer;
-	NeAACDecHandle decoder;
-	NeAACDecFrameInfo frameInfo;
-	NeAACDecConfigurationPtr config;
-	unsigned char channels;
-	long sampleRate;
-	long bufferlen = 0;
-
-	decoder = NeAACDecOpen();
-	config = NeAACDecGetCurrentConfiguration(decoder);
-	config->outputFormat = FAAD_FMT_16BIT;
-	NeAACDecSetConfiguration(decoder,config);
-	NeAACDecInit(decoder,&buffer,bufferlen,&sampleRate,&channels);
-	NeAACDecInit2(decoder,&buffer,bufferlen,&sampleRate,&channels);
-	NeAACDecDecode(decoder,&frameInfo,&buffer,bufferlen);
-	NeAACDecClose(decoder);
-
-	return 0;
-}
-])],AC_MSG_RESULT(yes),[AC_MSG_RESULT(no);enable_aac=no])
-	fi
-	if test x$enable_aac = xyes; then
-		AC_DEFINE(HAVE_FAAD,1,[Define to use FAAD2 for AAC decoding])
-	else
-		AC_MSG_WARN([faad2 lib needed for MP4/AAC support -- disabling MP4/AAC support])
-	fi
-	CFLAGS=$oldcflags
-	LIBS=$oldlibs
-	CPPFLAGS=$oldcppflags
-fi
-
-if test x$enable_aac = xno; then
-	FAAD_LIBS=""
-	FAAD_CFLAGS=""
-fi
-
-AC_SUBST(FAAD_CFLAGS)
-AC_SUBST(FAAD_LIBS)
-
-])
--- a/m4/mpd_auto.m4
+++ b/m4/mpd_auto.m4
@@ -1,23 +1,18 @@
+dnl Parameters: varname1, description
 AC_DEFUN([MPD_AUTO_ENABLED], [
-	var="enable_$1"
-	feature="$2"
-
-	if eval "test x`echo '$'$var` = xauto"; then
-		AC_MSG_NOTICE([auto-detected $feature])
-		eval "$var=yes"
+	if test x$[]enable_$1 = xauto; then
+		AC_MSG_NOTICE([auto-detected $2])
+		enable_$1=yes
 	fi
 ])

+dnl Parameters: varname1, description, errmsg
 AC_DEFUN([MPD_AUTO_DISABLED], [
-	var="enable_$1"
-	feature="$2"
-	msg="$3"
-
-	if eval "test x`echo '$'$var` = xauto"; then
-		AC_MSG_WARN([$msg -- disabling $feature])
-		eval "$var=no"
-	elif eval "test x`echo '$'$var` = xyes"; then
-		AC_MSG_ERROR([$feature: $msg])
+	if test x$[]enable_$1 = xauto; then
+		AC_MSG_WARN([$3 -- disabling $2])
+		enable_$1=no
+	elif test x$[]enable_$1 = xyes; then
+		AC_MSG_ERROR([$2: $3])
 	fi
 ])

@@ -25,59 +20,59 @@ dnl Check whether a prerequisite for a feature was found.  This is
 dnl very similar to MPD_AUTO_RESULT, but does not finalize the
 dnl detection; it assumes that more checks will follow.
 AC_DEFUN([MPD_AUTO_PRE], [
-	name="$1"
-	var="enable_$1"
-	found="found_$name"
-	feature="$2"
-	msg="$3"
-
-	if eval "test x`echo '$'$var` != xno" && eval "test x`echo '$'$found` = xno"; then
-                MPD_AUTO_DISABLED([$name], [$feature], [$msg])
+	if test x$[]enable_$1 != xno && test x$[]found_$1 = xno; then
+                MPD_AUTO_DISABLED([$1], [$2], [$3])
 	fi
 ])

+dnl Evaluate a check's result.  Abort if the feature was requested
+dnl explicitly but is unavailable.
+dnl
+dnl Parameters: varname1, description, errmsg
 AC_DEFUN([MPD_AUTO_RESULT], [
-	name="$1"
-	var="enable_$1"
-	found="found_$name"
-	feature="$2"
-	msg="$3"
-
-	if eval "test x`echo '$'$var` = xno"; then
-		eval "$found=no"
+	if test x$[]enable_$1 = xno; then
+		found_$1=no
 	fi

-	if eval "test x`echo '$'$found` = xyes"; then
-                MPD_AUTO_ENABLED([$name], [$feature])
+	if test x$[]found_$1 = xyes; then
+                MPD_AUTO_ENABLED([$1], [$2])
 	else
-                MPD_AUTO_DISABLED([$name], [$feature], [$msg])
+                MPD_AUTO_DISABLED([$1], [$2], [$3])
 	fi
 ])

-AC_DEFUN([MPD_AUTO_PKG], [
-	if eval "test x`echo '$'enable_$1` != xno"; then
-		PKG_CHECK_MODULES([$2], [$3],
-			[eval "found_$1=yes"],
-			[eval "found_$1=no"])
+dnl Invoke a check if its configuration is "yes" or "auto" and call
+dnl MPD_AUTO_RESULT.
+dnl
+dnl Parameters: varname1, description, errmsg, check
+AC_DEFUN([MPD_AUTO], [
+	if test x$[]enable_$1 != xno; then
+		$4
 	fi
+	MPD_AUTO_RESULT([$1], [$2], [$3])
+])

-	MPD_AUTO_RESULT([$1], [$4], [$5])
+dnl Wrapper for MPD_AUTO and PKG_CHECK_MODULES.
+dnl
+dnl Parameters: varname1, varname2, pkgname, description, errmsg
+AC_DEFUN([MPD_AUTO_PKG], [
+	MPD_AUTO([$1], [$4], [$5],
+		[PKG_CHECK_MODULES([$2], [$3],
+			[found_$1=yes],
+			[found_$1=no])])
 ])

 dnl Check with pkg-config first, fall back to AC_CHECK_LIB.
 dnl
 dnl Parameters: varname1, varname2, pkgname, libname, symname, libs, cflags, description, errmsg
 AC_DEFUN([MPD_AUTO_PKG_LIB], [
-	if eval "test x`echo '$'enable_$1` != xno"; then
-		PKG_CHECK_MODULES([$2], [$3],
-			[eval "found_$1=yes"],
+	MPD_AUTO([$1], [$8], [$9],
+		[PKG_CHECK_MODULES([$2], [$3],
+			[found_$1=yes],
 			AC_CHECK_LIB($4, $5,
-				[eval "found_$1=yes $2_LIBS='$6' $2_CFLAGS='$7'"],
-				[eval "found_$1=no"],
-				[$6]))
-	fi
-
-	MPD_AUTO_RESULT([$1], [$8], [$9])
+				[found_$1=yes $2_LIBS='$6' $2_CFLAGS='$7'],
+				[found_$1=no],
+				[$6]))])
 ])

 dnl Wrapper for AC_CHECK_LIB.
@@ -87,12 +82,104 @@ AC_DEFUN([MPD_AUTO_LIB], [
 	AC_SUBST([$2_LIBS], [])
 	AC_SUBST([$2_CFLAGS], [])

-	if eval "test x`echo '$'enable_$1` != xno"; then
-		AC_CHECK_LIB($3, $4,
-			[eval "found_$1=yes $2_LIBS='$5' $2_CFLAGS='$6'"],
-			[eval "found_$1=no"],
-			[$5])
-	fi
-
-	MPD_AUTO_RESULT([$1], [$7], [$8])
+	MPD_AUTO([$1], [$7], [$8],
+		[AC_CHECK_LIB($3, $4,
+			[found_$1=yes $2_LIBS='$5' $2_CFLAGS='$6'],
+			[found_$1=no],
+			[$5])])
+])
+
+dnl Wrapper for AC_CHECK_HEADER.
+dnl
+dnl Parameters: varname1, varname2, header, libs, cflags, description, errmsg
+AC_DEFUN([MPD_AUTO_HEADER], [
+	AC_SUBST([$2_LIBS], [])
+	AC_SUBST([$2_CFLAGS], [])
+
+	MPD_AUTO([$1], [$6], [$7],
+		[AC_CHECK_HEADER([$3],
+			[found_$1=yes $2_LIBS='$4' $2_CFLAGS='$5'],
+			[found_$1=no])])
+])
+
+dnl Convert the given string into a string for the "default value" in
+dnl the help text.  If the string is a literal, then it is returned
+dnl as-is; if it contains a variable reference, just "auto" is
+dnl emitted.
+dnl
+dnl Parameters: varname1
+AC_DEFUN([MPD_FORMAT_DEFAULT],
+	[ifelse([$1], [], [auto],
+		index([$1], [$]), [-1], [$1],
+		[auto])])
+
+dnl Wrapper for AC_ARG_ENABLE, AC_DEFINE and AM_CONDITIONAL
+dnl
+dnl Parameters: varname1, varname2, description, default, check
+AC_DEFUN([MPD_ARG_ENABLE], [
+	AC_ARG_ENABLE(translit([$1], [_], [-]),
+		AS_HELP_STRING([--enable-]translit([$1], [_], [-]),
+			[enable $3 (default: ]MPD_FORMAT_DEFAULT([$4])[)]),,
+		[enable_$1=]ifelse([$4], [], [auto], [$4]))
+
+	$5
+
+	MPD_DEFINE_CONDITIONAL(enable_$1, ENABLE_$2, [$3])
+])
+
+dnl Wrapper for MPD_ARG_ENABLE and MPD_AUTO
+dnl
+dnl Parameters: varname1, varname2, description, errmsg, default, check
+AC_DEFUN([MPD_ENABLE_AUTO], [
+	MPD_ARG_ENABLE([$1], [$2], [$3], [$5], [
+		MPD_AUTO([$1], [$3], [$4], [$6])
+	])
+])
+
+dnl Wrapper for AC_ARG_ENABLE and MPD_AUTO_PKG
+dnl
+dnl Parameters: varname1, varname2, pkg, description, errmsg, default, pre
+AC_DEFUN([MPD_ENABLE_AUTO_PKG], [
+	MPD_ARG_ENABLE([$1], [$2], [$4], [$6], [
+		$7
+		MPD_AUTO_PKG($1, $2, $3, $4, $5)
+	])
+])
+
+dnl Wrapper for AC_ARG_ENABLE and MPD_AUTO_PKG_LIB
+dnl
+dnl Parameters: varname1, varname2, pkg, libname, symname, libs, cflags, description, errmsg, default, pre
+AC_DEFUN([MPD_ENABLE_AUTO_PKG_LIB], [
+	MPD_ARG_ENABLE([$1], [$2], [$8], [$10], [
+		$11
+		MPD_AUTO_PKG_LIB($1, $2, $3, $4, $5, $6, $7, $8, $9)
+	])
+])
+
+dnl Wrapper for AC_ARG_ENABLE and MPD_AUTO_LIB
+dnl
+dnl Parameters: varname1, varname2, libname, symname, libs, cflags, description, errmsg, default, pre
+AC_DEFUN([MPD_ENABLE_AUTO_LIB], [
+	MPD_ARG_ENABLE([$1], [$2], [$7], [$9], [
+		$10
+		MPD_AUTO_LIB($1, $2, $3, $4, $5, $6, $7, $8)
+	])
+])
+
+dnl Wrapper for AC_ARG_ENABLE and MPD_AUTO_HEADER
+dnl
+dnl Parameters: varname1, varname2, header, libs, cflags, description, errmsg, default, pre
+AC_DEFUN([MPD_ENABLE_AUTO_HEADER], [
+	MPD_ARG_ENABLE([$1], [$2], [$6], [$8], [
+		$9
+		MPD_AUTO_HEADER($1, $2, $3, $4, $5, $6, $7)
+	])
+])
+
+dnl Wrapper for MPD_ENABLE_AUTO_PKG and MPD_DEPENDS
+dnl
+dnl Parameters: varname1, varname2, pkg, description, errmsg, default, dep_variable, dep_errmsg
+AC_DEFUN([MPD_ENABLE_AUTO_PKG_DEPENDS], [
+	MPD_ENABLE_AUTO_PKG([$1], [$2], [$3], [$4], [$5], [$6],
+		[MPD_DEPENDS([enable_$1], [$7], [$8])])
 ])
--- a/m4/mpd_define_conditional.m4
+++ b/m4/mpd_define_conditional.m4
@@ -0,0 +1,8 @@
+dnl Wrapper for AC_DEFINE and AM_CONDITIONAL
+dnl
+dnl Parameters: varname1, varname2, description
+AC_DEFUN([MPD_DEFINE_CONDITIONAL], [dnl
+	AM_CONDITIONAL($2, test x$[]$1 = xyes)
+	if test x$[]$1 = xyes; then
+		AC_DEFINE($2, 1, [Define to enable $3])
+	fi])
--- a/m4/mpd_func.m4
+++ b/m4/mpd_func.m4
@@ -6,7 +6,7 @@ AC_DEFUN([MPD_OPTIONAL_FUNC], [
 	AC_ARG_ENABLE([$1],
 		AS_HELP_STRING([--enable-$1],
 			[use the function "$1" (default: auto)]),
-		[test xenable_$1 = xyes && AC_DEFINE([$3], 1, [Define to use $1])],
+		[test x$[]enable_$1 = xyes && AC_DEFINE([$3], 1, [Define to use $1])],
 		[AC_CHECK_FUNC([$2],
 			[AC_DEFINE([$3], 1, [Define to use $1])],)])
 ])
--- a/m4/mpd_with_flags.m4
+++ b/m4/mpd_with_flags.m4
@@ -0,0 +1,23 @@
+dnl Run code with the specified CFLAGS/CXXFLAGS and LIBS appended.
+dnl Restores the old values afterwards.
+dnl
+dnl Parameters: cflags, libs, code
+AC_DEFUN([MPD_WITH_FLAGS], [
+	ac_save_CFLAGS="$[]CFLAGS"
+	ac_save_CXXFLAGS="$[]CXXFLAGS"
+	ac_save_LIBS="$[]LIBS"
+	CFLAGS="$[]CFLAGS $1"
+	CXXFLAGS="$[]CXXFLAGS $1"
+	LIBS="$[]LIBS $2"
+	$3
+	CFLAGS="$[]ac_save_CFLAGS"
+	CXXFLAGS="$[]ac_save_CXXFLAGS"
+	LIBS="$[]ac_save_LIBS"
+])
+
+dnl Run code with the specified library's CFLAGS/CXXFLAGS and LIBS
+dnl appended.  Restores the old values afterwards.
+dnl
+dnl Parameters: libname, code
+AC_DEFUN([MPD_WITH_LIBRARY],
+	[MPD_WITH_FLAGS([$[]$1_CFLAGS], [$[]$1_LIBS], [$2])])
--- a/m4/pkg.m4
+++ b/m4/pkg.m4
@@ -1,29 +1,60 @@
-# pkg.m4 - Macros to locate and utilise pkg-config.            -*- Autoconf -*-
-# serial 1 (pkg-config-0.24)
-# 
-# Copyright © 2004 Scott James Remnant <scott@netsplit.com>.
-#
-# This program is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful, but
-# WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-# General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program; if not, write to the Free Software
-# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
-#
-# As a special exception to the GNU General Public License, if you
-# distribute this file as part of a program that contains a
-# configuration script generated by Autoconf, you may include it under
-# the same distribution terms that you use for the rest of that program.
+dnl pkg.m4 - Macros to locate and utilise pkg-config.   -*- Autoconf -*-
+dnl serial 11 (pkg-config-0.29)
+dnl
+dnl Copyright © 2004 Scott James Remnant <scott@netsplit.com>.
+dnl Copyright © 2012-2015 Dan Nicholson <dbn.lists@gmail.com>
+dnl
+dnl This program is free software; you can redistribute it and/or modify
+dnl it under the terms of the GNU General Public License as published by
+dnl the Free Software Foundation; either version 2 of the License, or
+dnl (at your option) any later version.
+dnl
+dnl This program is distributed in the hope that it will be useful, but
+dnl WITHOUT ANY WARRANTY; without even the implied warranty of
+dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+dnl General Public License for more details.
+dnl
+dnl You should have received a copy of the GNU General Public License
+dnl along with this program; if not, write to the Free Software
+dnl Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+dnl 02111-1307, USA.
+dnl
+dnl As a special exception to the GNU General Public License, if you
+dnl distribute this file as part of a program that contains a
+dnl configuration script generated by Autoconf, you may include it under
+dnl the same distribution terms that you use for the rest of that
+dnl program.

-# PKG_PROG_PKG_CONFIG([MIN-VERSION])
-# ----------------------------------
+dnl PKG_PREREQ(MIN-VERSION)
+dnl -----------------------
+dnl Since: 0.29
+dnl
+dnl Verify that the version of the pkg-config macros are at least
+dnl MIN-VERSION. Unlike PKG_PROG_PKG_CONFIG, which checks the user's
+dnl installed version of pkg-config, this checks the developer's version
+dnl of pkg.m4 when generating configure.
+dnl
+dnl To ensure that this macro is defined, also add:
+dnl m4_ifndef([PKG_PREREQ],
+dnl     [m4_fatal([must install pkg-config 0.29 or later before running autoconf/autogen])])
+dnl
+dnl See the "Since" comment for each macro you use to see what version
+dnl of the macros you require.
+m4_defun([PKG_PREREQ],
+[m4_define([PKG_MACROS_VERSION], [0.29])
+m4_if(m4_version_compare(PKG_MACROS_VERSION, [$1]), -1,
+    [m4_fatal([pkg.m4 version $1 or higher is required but ]PKG_MACROS_VERSION[ found])])
+])dnl PKG_PREREQ
+
+dnl PKG_PROG_PKG_CONFIG([MIN-VERSION])
+dnl ----------------------------------
+dnl Since: 0.16
+dnl
+dnl Search for the pkg-config tool and set the PKG_CONFIG variable to
+dnl first found in the path. Checks that the version of pkg-config found
+dnl is at least MIN-VERSION. If MIN-VERSION is not specified, 0.9.0 is
+dnl used since that's the first version where most current features of
+dnl pkg-config existed.
 AC_DEFUN([PKG_PROG_PKG_CONFIG],
 [m4_pattern_forbid([^_?PKG_[A-Z_]+$])
 m4_pattern_allow([^PKG_CONFIG(_(PATH|LIBDIR|SYSROOT_DIR|ALLOW_SYSTEM_(CFLAGS|LIBS)))?$])
@@ -45,18 +76,19 @@ if test -n "$PKG_CONFIG"; then
 		PKG_CONFIG=""
 	fi
 fi[]dnl
-])# PKG_PROG_PKG_CONFIG
+])dnl PKG_PROG_PKG_CONFIG

-# PKG_CHECK_EXISTS(MODULES, [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
-#
-# Check to see whether a particular set of modules exists.  Similar
-# to PKG_CHECK_MODULES(), but does not set variables or print errors.
-#
-# Please remember that m4 expands AC_REQUIRE([PKG_PROG_PKG_CONFIG])
-# only at the first occurence in configure.ac, so if the first place
-# it's called might be skipped (such as if it is within an "if", you
-# have to call PKG_CHECK_EXISTS manually
-# --------------------------------------------------------------
+dnl PKG_CHECK_EXISTS(MODULES, [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
+dnl -------------------------------------------------------------------
+dnl Since: 0.18
+dnl
+dnl Check to see whether a particular set of modules exists. Similar to
+dnl PKG_CHECK_MODULES(), but does not set variables or print errors.
+dnl
+dnl Please remember that m4 expands AC_REQUIRE([PKG_PROG_PKG_CONFIG])
+dnl only at the first occurence in configure.ac, so if the first place
+dnl it's called might be skipped (such as if it is within an "if", you
+dnl have to call PKG_CHECK_EXISTS manually
 AC_DEFUN([PKG_CHECK_EXISTS],
 [AC_REQUIRE([PKG_PROG_PKG_CONFIG])dnl
 if test -n "$PKG_CONFIG" && \
@@ -66,8 +98,10 @@ m4_ifvaln([$3], [else
  $3])dnl
 fi])

-# _PKG_CONFIG([VARIABLE], [COMMAND], [MODULES])
-# ---------------------------------------------
+dnl _PKG_CONFIG([VARIABLE], [COMMAND], [MODULES])
+dnl ---------------------------------------------
+dnl Internal wrapper calling pkg-config via PKG_CONFIG and setting
+dnl pkg_failed based on the result.
 m4_define([_PKG_CONFIG],
 [if test -n "$$1"; then
    pkg_cv_[]$1="$$1"
@@ -79,10 +113,11 @@ m4_define([_PKG_CONFIG],
 else
    pkg_failed=untried
 fi[]dnl
-])# _PKG_CONFIG
+])dnl _PKG_CONFIG

-# _PKG_SHORT_ERRORS_SUPPORTED
-# -----------------------------
+dnl _PKG_SHORT_ERRORS_SUPPORTED
+dnl ---------------------------
+dnl Internal check to see if pkg-config supports short errors.
 AC_DEFUN([_PKG_SHORT_ERRORS_SUPPORTED],
 [AC_REQUIRE([PKG_PROG_PKG_CONFIG])
 if $PKG_CONFIG --atleast-pkgconfig-version 0.20; then
@@ -90,19 +125,17 @@ if $PKG_CONFIG --atleast-pkgconfig-version 0.20; then
 else
        _pkg_short_errors_supported=no
 fi[]dnl
-])# _PKG_SHORT_ERRORS_SUPPORTED
+])dnl _PKG_SHORT_ERRORS_SUPPORTED


-# PKG_CHECK_MODULES(VARIABLE-PREFIX, MODULES, [ACTION-IF-FOUND],
-# [ACTION-IF-NOT-FOUND])
-#
-#
-# Note that if there is a possibility the first call to
-# PKG_CHECK_MODULES might not happen, you should be sure to include an
-# explicit call to PKG_PROG_PKG_CONFIG in your configure.ac
-#
-#
-# --------------------------------------------------------------
+dnl PKG_CHECK_MODULES(VARIABLE-PREFIX, MODULES, [ACTION-IF-FOUND],
+dnl   [ACTION-IF-NOT-FOUND])
+dnl --------------------------------------------------------------
+dnl Since: 0.4.0
+dnl
+dnl Note that if there is a possibility the first call to
+dnl PKG_CHECK_MODULES might not happen, you should be sure to include an
+dnl explicit call to PKG_PROG_PKG_CONFIG in your configure.ac
 AC_DEFUN([PKG_CHECK_MODULES],
 [AC_REQUIRE([PKG_PROG_PKG_CONFIG])dnl
 AC_ARG_VAR([$1][_CFLAGS], [C compiler flags for $1, overriding pkg-config])dnl
@@ -156,16 +189,40 @@ else
        AC_MSG_RESULT([yes])
 	$3
 fi[]dnl
-])# PKG_CHECK_MODULES
+])dnl PKG_CHECK_MODULES


-# PKG_INSTALLDIR(DIRECTORY)
-# -------------------------
-# Substitutes the variable pkgconfigdir as the location where a module
-# should install pkg-config .pc files. By default the directory is
-# $libdir/pkgconfig, but the default can be changed by passing
-# DIRECTORY. The user can override through the --with-pkgconfigdir
-# parameter.
+dnl PKG_CHECK_MODULES_STATIC(VARIABLE-PREFIX, MODULES, [ACTION-IF-FOUND],
+dnl   [ACTION-IF-NOT-FOUND])
+dnl ---------------------------------------------------------------------
+dnl Since: 0.29
+dnl
+dnl Checks for existence of MODULES and gathers its build flags with
+dnl static libraries enabled. Sets VARIABLE-PREFIX_CFLAGS from --cflags
+dnl and VARIABLE-PREFIX_LIBS from --libs.
+dnl
+dnl Note that if there is a possibility the first call to
+dnl PKG_CHECK_MODULES_STATIC might not happen, you should be sure to
+dnl include an explicit call to PKG_PROG_PKG_CONFIG in your
+dnl configure.ac.
+AC_DEFUN([PKG_CHECK_MODULES_STATIC],
+[AC_REQUIRE([PKG_PROG_PKG_CONFIG])dnl
+_save_PKG_CONFIG=$PKG_CONFIG
+PKG_CONFIG="$PKG_CONFIG --static"
+PKG_CHECK_MODULES($@)
+PKG_CONFIG=$_save_PKG_CONFIG[]dnl
+])dnl PKG_CHECK_MODULES_STATIC
+
+
+dnl PKG_INSTALLDIR([DIRECTORY])
+dnl -------------------------
+dnl Since: 0.27
+dnl
+dnl Substitutes the variable pkgconfigdir as the location where a module
+dnl should install pkg-config .pc files. By default the directory is
+dnl $libdir/pkgconfig, but the default can be changed by passing
+dnl DIRECTORY. The user can override through the --with-pkgconfigdir
+dnl parameter.
 AC_DEFUN([PKG_INSTALLDIR],
 [m4_pushdef([pkg_default], [m4_default([$1], ['${libdir}/pkgconfig'])])
 m4_pushdef([pkg_description],
@@ -176,16 +233,18 @@ AC_ARG_WITH([pkgconfigdir],
 AC_SUBST([pkgconfigdir], [$with_pkgconfigdir])
 m4_popdef([pkg_default])
 m4_popdef([pkg_description])
-]) dnl PKG_INSTALLDIR
+])dnl PKG_INSTALLDIR


-# PKG_NOARCH_INSTALLDIR(DIRECTORY)
-# -------------------------
-# Substitutes the variable noarch_pkgconfigdir as the location where a
-# module should install arch-independent pkg-config .pc files. By
-# default the directory is $datadir/pkgconfig, but the default can be
-# changed by passing DIRECTORY. The user can override through the
-# --with-noarch-pkgconfigdir parameter.
+dnl PKG_NOARCH_INSTALLDIR([DIRECTORY])
+dnl --------------------------------
+dnl Since: 0.27
+dnl
+dnl Substitutes the variable noarch_pkgconfigdir as the location where a
+dnl module should install arch-independent pkg-config .pc files. By
+dnl default the directory is $datadir/pkgconfig, but the default can be
+dnl changed by passing DIRECTORY. The user can override through the
+dnl --with-noarch-pkgconfigdir parameter.
 AC_DEFUN([PKG_NOARCH_INSTALLDIR],
 [m4_pushdef([pkg_default], [m4_default([$1], ['${datadir}/pkgconfig'])])
 m4_pushdef([pkg_description],
@@ -196,13 +255,15 @@ AC_ARG_WITH([noarch-pkgconfigdir],
 AC_SUBST([noarch_pkgconfigdir], [$with_noarch_pkgconfigdir])
 m4_popdef([pkg_default])
 m4_popdef([pkg_description])
-]) dnl PKG_NOARCH_INSTALLDIR
+])dnl PKG_NOARCH_INSTALLDIR


-# PKG_CHECK_VAR(VARIABLE, MODULE, CONFIG-VARIABLE,
-# [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
-# -------------------------------------------
-# Retrieves the value of the pkg-config variable for the given module.
+dnl PKG_CHECK_VAR(VARIABLE, MODULE, CONFIG-VARIABLE,
+dnl [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
+dnl -------------------------------------------
+dnl Since: 0.28
+dnl
+dnl Retrieves the value of the pkg-config variable for the given module.
 AC_DEFUN([PKG_CHECK_VAR],
 [AC_REQUIRE([PKG_PROG_PKG_CONFIG])dnl
 AC_ARG_VAR([$1], [value of $3 for $2, overriding pkg-config])dnl
@@ -211,4 +272,4 @@ _PKG_CONFIG([$1], [variable="][$3]["], [$2])
 AS_VAR_COPY([$1], [pkg_cv_][$1])

 AS_VAR_IF([$1], [""], [$5], [$4])dnl
-])# PKG_CHECK_VAR
+])dnl PKG_CHECK_VAR
--- a/m4/pretty_print.m4
+++ b/m4/pretty_print.m4
@@ -1,16 +1,6 @@
 AC_DEFUN([results], [
-	dnl This is a hack to allow "with" names, otherwise "enable".
-	num=`expr $1 : 'with'`
-	if test "$num" != "0"; then
-		var="`echo '$'$1`"
-	else
-		var="`echo '$'enable_$1`"
-	fi
-
 	printf '('
-	if eval "test x$var = xyes"; then
-		printf '+'
-	elif test -n "$3" && eval "test x$var = x$3"; then
+	if test x$[]enable_$1 = xyes; then
 		printf '+'
 	else
 		printf '-'
--- a/python/build/autotools.py
+++ b/python/build/autotools.py
@@ -0,0 +1,46 @@
+import os.path, subprocess
+
+from build.project import Project
+
+class AutotoolsProject(Project):
+    def __init__(self, url, md5, installed, configure_args=[],
+                 autogen=False,
+                 cppflags='',
+                 **kwargs):
+        Project.__init__(self, url, md5, installed, **kwargs)
+        self.configure_args = configure_args
+        self.autogen = autogen
+        self.cppflags = cppflags
+
+    def build(self, toolchain):
+        src = self.unpack(toolchain)
+        if self.autogen:
+            subprocess.check_call(['libtoolize', '--force'], cwd=src)
+            subprocess.check_call(['aclocal'], cwd=src)
+            subprocess.check_call(['automake', '--add-missing', '--force-missing', '--foreign'], cwd=src)
+            subprocess.check_call(['autoconf'], cwd=src)
+
+        build = self.make_build_path(toolchain)
+
+        configure = [
+            os.path.join(src, 'configure'),
+            'CC=' + toolchain.cc,
+            'CXX=' + toolchain.cxx,
+            'CFLAGS=' + toolchain.cflags,
+            'CXXFLAGS=' + toolchain.cxxflags,
+            'CPPFLAGS=' + toolchain.cppflags + ' ' + self.cppflags,
+            'LDFLAGS=' + toolchain.ldflags,
+            'LIBS=' + toolchain.libs,
+            'AR=' + toolchain.ar,
+            'RANLIB=' + toolchain.ranlib,
+            'STRIP=' + toolchain.strip,
+            '--host=' + toolchain.arch,
+            '--prefix=' + toolchain.install_prefix,
+            '--enable-silent-rules',
+        ] + self.configure_args
+
+        subprocess.check_call(configure, cwd=build, env=toolchain.env)
+        subprocess.check_call(['/usr/bin/make', '--quiet', '-j12'],
+                              cwd=build, env=toolchain.env)
+        subprocess.check_call(['/usr/bin/make', '--quiet', 'install'],
+                              cwd=build, env=toolchain.env)
--- a/python/build/boost.py
+++ b/python/build/boost.py
@@ -0,0 +1,23 @@
+import os, shutil
+import re
+
+from build.project import Project
+
+class BoostProject(Project):
+    def __init__(self, url, md5, installed,
+                 **kwargs):
+        m = re.match(r'.*/boost_(\d+)_(\d+)_(\d+)\.tar\.bz2$', url)
+        version = "%s.%s.%s" % (m.group(1), m.group(2), m.group(3))
+        Project.__init__(self, url, md5, installed,
+                         name='boost', version=version,
+                         **kwargs)
+
+    def build(self, toolchain):
+        src = self.unpack(toolchain)
+
+        # install the headers manually; don't build any library
+        # (because right now, we only use header-only libraries)
+        includedir = os.path.join(toolchain.install_prefix, 'include')
+        dest = os.path.join(includedir, 'boost')
+        shutil.rmtree(dest, ignore_errors=True)
+        shutil.copytree(os.path.join(src, 'boost'), dest)
--- a/python/build/dirs.py
+++ b/python/build/dirs.py
@@ -0,0 +1,9 @@
+import os.path
+
+lib_path = os.path.abspath('lib')
+
+shared_path = lib_path
+if 'MPD_SHARED_LIB' in os.environ:
+    shared_path = os.environ['MPD_SHARED_LIB']
+tarball_path = os.path.join(shared_path, 'download')
+src_path = os.path.join(shared_path, 'src')
--- a/python/build/download.py
+++ b/python/build/download.py
@@ -0,0 +1,26 @@
+from build.verify import verify_file_digest
+import os
+import urllib.request
+
+def download_and_verify(url, md5, parent_path):
+    """Download a file, verify its MD5 checksum and return the local path."""
+
+    os.makedirs(parent_path, exist_ok=True)
+    path = os.path.join(parent_path, os.path.basename(url))
+
+    try:
+        if verify_file_digest(path, md5): return path
+        os.unlink(path)
+    except FileNotFoundError:
+        pass
+
+    tmp_path = path + '.tmp'
+
+    print("download", url)
+    urllib.request.urlretrieve(url, tmp_path)
+    if not verify_file_digest(tmp_path, md5):
+        os.unlink(tmp_path)
+        raise RuntimeError("Digest mismatch")
+
+    os.rename(tmp_path, path)
+    return path
--- a/python/build/ffmpeg.py
+++ b/python/build/ffmpeg.py
@@ -0,0 +1,54 @@
+import os.path, subprocess
+
+from build.project import Project
+
+class FfmpegProject(Project):
+    def __init__(self, url, md5, installed, configure_args=[],
+                 cppflags='',
+                 **kwargs):
+        Project.__init__(self, url, md5, installed, **kwargs)
+        self.configure_args = configure_args
+        self.cppflags = cppflags
+
+    def _filter_cflags(self, flags):
+        # FFmpeg expects the GNU as syntax
+        flags = flags.replace(' -integrated-as ', ' -no-integrated-as ')
+        return flags
+
+    def build(self, toolchain):
+        src = self.unpack(toolchain)
+        build = self.make_build_path(toolchain)
+
+        if toolchain.is_arm:
+            arch = 'arm'
+        else:
+            arch = 'x86'
+
+        if toolchain.is_windows:
+            target_os = 'mingw32'
+        else:
+            target_os = 'linux'
+
+        configure = [
+            os.path.join(src, 'configure'),
+            '--cc=' + toolchain.cc,
+            '--cxx=' + toolchain.cxx,
+            '--nm=' + toolchain.nm,
+            '--extra-cflags=' + self._filter_cflags(toolchain.cflags) + ' ' + toolchain.cppflags + ' ' + self.cppflags,
+            '--extra-cxxflags=' + self._filter_cflags(toolchain.cxxflags) + ' ' + toolchain.cppflags + ' ' + self.cppflags,
+            '--extra-ldflags=' + toolchain.ldflags,
+            '--extra-libs=' + toolchain.libs,
+            '--ar=' + toolchain.ar,
+            '--ranlib=' + toolchain.ranlib,
+            '--enable-cross-compile',
+            '--arch=' + arch,
+            '--target-os=' + target_os,
+            '--prefix=' + toolchain.install_prefix,
+        ] + self.configure_args
+
+        if toolchain.is_armv7:
+            configure.append('--cpu=cortex-a8')
+
+        subprocess.check_call(configure, cwd=build, env=toolchain.env)
+        subprocess.check_call(['/usr/bin/make', '--quiet', '-j12'], cwd=build, env=toolchain.env)
+        subprocess.check_call(['/usr/bin/make', '--quiet', 'install'], cwd=build, env=toolchain.env)
--- a/python/build/libs.py
+++ b/python/build/libs.py
@@ -0,0 +1,109 @@
+from build.project import Project
+from build.zlib import ZlibProject
+from build.autotools import AutotoolsProject
+from build.ffmpeg import FfmpegProject
+from build.boost import BoostProject
+
+libogg = AutotoolsProject(
+    'http://downloads.xiph.org/releases/ogg/libogg-1.3.2.tar.xz',
+    '5c3a34309d8b98640827e5d0991a4015',
+    'lib/libogg.a',
+    ['--disable-shared', '--enable-static'],
+)
+
+libvorbis = AutotoolsProject(
+    'http://downloads.xiph.org/releases/vorbis/libvorbis-1.3.5.tar.xz',
+    '28cb28097c07a735d6af56e598e1c90f',
+    'lib/libvorbis.a',
+    ['--disable-shared', '--enable-static'],
+)
+
+opus = AutotoolsProject(
+    'http://downloads.xiph.org/releases/opus/opus-1.1.3.tar.gz',
+    '32bbb6b557fe1b6066adc0ae1f08b629',
+    'lib/libopus.a',
+    ['--disable-shared', '--enable-static'],
+)
+
+flac = AutotoolsProject(
+    'http://downloads.xiph.org/releases/flac/flac-1.3.2.tar.xz',
+    '91cfc3ed61dc40f47f050a109b08610667d73477af6ef36dcad31c31a4a8d53f',
+    'lib/libFLAC.a',
+    [
+        '--disable-shared', '--enable-static',
+        '--disable-xmms-plugin', '--disable-cpplibs',
+    ],
+)
+
+zlib = ZlibProject(
+    'http://zlib.net/zlib-1.2.8.tar.xz',
+    '28f1205d8dd2001f26fec1e8c2cebe37',
+    'lib/libz.a',
+)
+
+libid3tag = AutotoolsProject(
+    'ftp://ftp.mars.org/pub/mpeg/libid3tag-0.15.1b.tar.gz',
+    'e5808ad997ba32c498803822078748c3',
+    'lib/libid3tag.a',
+    ['--disable-shared', '--enable-static'],
+    autogen=True,
+)
+
+libmad = AutotoolsProject(
+    'ftp://ftp.mars.org/pub/mpeg/libmad-0.15.1b.tar.gz',
+    '1be543bc30c56fb6bea1d7bf6a64e66c',
+    'lib/libmad.a',
+    ['--disable-shared', '--enable-static'],
+    autogen=True,
+)
+
+ffmpeg = FfmpegProject(
+    'http://ffmpeg.org/releases/ffmpeg-3.2.2.tar.xz',
+    '3f01bd1fe1a17a277f8c84869e5d9192b4b978cb660872aa2b54c3cc8a2fedfc',
+    'lib/libavcodec.a',
+    [
+        '--disable-shared', '--enable-static',
+        '--enable-gpl',
+        '--enable-small',
+        '--disable-pthreads',
+        '--disable-programs',
+        '--disable-doc',
+        '--disable-avdevice',
+        '--disable-swresample',
+        '--disable-swscale',
+        '--disable-postproc',
+        '--disable-avfilter',
+        '--disable-network',
+        '--disable-encoders',
+        '--disable-protocols',
+        '--disable-outdevs',
+        '--disable-filters',
+    ],
+)
+
+curl = AutotoolsProject(
+    'http://curl.haxx.se/download/curl-7.52.1.tar.lzma',
+    '44286d4b825936e2430fc44ad730ce899afb736a5d328cbb8b5d42462f3f2365',
+    'lib/libcurl.a',
+    [
+        '--disable-shared', '--enable-static',
+        '--disable-debug',
+        '--enable-http',
+        '--enable-ipv6',
+        '--disable-ftp', '--disable-file',
+        '--disable-ldap', '--disable-ldaps',
+        '--disable-rtsp', '--disable-proxy', '--disable-dict', '--disable-telnet',
+        '--disable-tftp', '--disable-pop3', '--disable-imap', '--disable-smtp',
+        '--disable-gopher',
+        '--disable-manual',
+        '--disable-threaded-resolver', '--disable-verbose', '--disable-sspi',
+        '--disable-crypto-auth', '--disable-ntlm-wb', '--disable-tls-srp', '--disable-cookies',
+        '--without-ssl', '--without-gnutls', '--without-nss', '--without-libssh2',
+    ],
+)
+
+boost = BoostProject(
+    'http://downloads.sourceforge.net/project/boost/boost/1.63.0/boost_1_63_0.tar.bz2',
+    'beae2529f759f6b3bf3f4969a19c2e9d6f0c503edcb2de4a61d1428519fcb3b0',
+    'include/boost/version.hpp',
+)
--- a/python/build/project.py
+++ b/python/build/project.py
@@ -0,0 +1,59 @@
+import os, shutil
+import re
+
+from build.download import download_and_verify
+from build.tar import untar
+
+class Project:
+    def __init__(self, url, md5, installed, name=None, version=None,
+                 base=None,
+                 use_cxx=False):
+        if base is None:
+            basename = os.path.basename(url)
+            m = re.match(r'^(.+)\.(tar(\.(gz|bz2|xz|lzma))?|zip)$', basename)
+            if not m: raise
+            self.base = m.group(1)
+        else:
+            self.base = base
+
+        if name is None or version is None:
+            m = re.match(r'^([-\w]+)-(\d[\d.]*[a-z]?)$', self.base)
+            if name is None: name = m.group(1)
+            if version is None: version = m.group(2)
+
+        self.name = name
+        self.version = version
+
+        self.url = url
+        self.md5 = md5
+        self.installed = installed
+
+        self.use_cxx = use_cxx
+
+    def download(self, toolchain):
+        return download_and_verify(self.url, self.md5, toolchain.tarball_path)
+
+    def is_installed(self, toolchain):
+        tarball = self.download(toolchain)
+        installed = os.path.join(toolchain.install_prefix, self.installed)
+        tarball_mtime = os.path.getmtime(tarball)
+        try:
+            return os.path.getmtime(installed) >= tarball_mtime
+        except FileNotFoundError:
+            return False
+
+    def unpack(self, toolchain, out_of_tree=True):
+        if out_of_tree:
+            parent_path = toolchain.src_path
+        else:
+            parent_path = toolchain.build_path
+        return untar(self.download(toolchain), parent_path, self.base)
+
+    def make_build_path(self, toolchain):
+        path = os.path.join(toolchain.build_path, self.base)
+        try:
+            shutil.rmtree(path)
+        except FileNotFoundError:
+            pass
+        os.makedirs(path, exist_ok=True)
+        return path
--- a/python/build/tar.py
+++ b/python/build/tar.py
@@ -0,0 +1,11 @@
+import os, shutil, subprocess
+
+def untar(tarball_path, parent_path, base):
+    path = os.path.join(parent_path, base)
+    try:
+        shutil.rmtree(path)
+    except FileNotFoundError:
+        pass
+    os.makedirs(parent_path, exist_ok=True)
+    subprocess.check_call(['/bin/tar', 'xfC', tarball_path, parent_path])
+    return path
--- a/python/build/verify.py
+++ b/python/build/verify.py
@@ -0,0 +1,42 @@
+import hashlib
+
+def feed_file(h, f):
+    """Feed data read from an open file into the hashlib instance."""
+
+    while True:
+        data = f.read(65536)
+        if len(data) == 0:
+            # end of file
+            break
+        h.update(data)
+
+def feed_file_path(h, path):
+    """Feed data read from a file (to be opened by this function) into the hashlib instance."""
+
+    with open(path, 'rb') as f:
+        feed_file(h, f)
+
+def file_digest(algorithm, path):
+    """Calculate the digest of a file and return it in hexadecimal notation."""
+
+    h = algorithm()
+    feed_file_path(h, path)
+    return h.hexdigest()
+
+def guess_digest_algorithm(digest):
+    l = len(digest)
+    if l == 32:
+        return hashlib.md5
+    elif l == 40:
+        return hashlib.sha1
+    elif l == 64:
+        return hashlib.sha256
+    else:
+        return None
+
+def verify_file_digest(path, expected_digest):
+    """Verify the digest of a file, and return True if the digest matches with the given expected digest."""
+
+    algorithm = guess_digest_algorithm(expected_digest)
+    assert(algorithm is not None)
+    return file_digest(algorithm, path) == expected_digest
--- a/python/build/zlib.py
+++ b/python/build/zlib.py
@@ -0,0 +1,22 @@
+import os.path, subprocess
+
+from build.project import Project
+
+class ZlibProject(Project):
+    def __init__(self, url, md5, installed,
+                 **kwargs):
+        Project.__init__(self, url, md5, installed, **kwargs)
+
+    def build(self, toolchain):
+        src = self.unpack(toolchain, out_of_tree=False)
+
+        subprocess.check_call(['/usr/bin/make', '--quiet',
+            '-f', 'win32/Makefile.gcc',
+            'PREFIX=' + toolchain.arch + '-',
+            '-j12',
+            'install',
+            'INCLUDE_PATH='+ os.path.join(toolchain.install_prefix, 'include'),
+            'LIBRARY_PATH=' + os.path.join(toolchain.install_prefix, 'lib'),
+            'BINARY_PATH=' + os.path.join(toolchain.install_prefix, 'bin'),
+            'SHARED_MODE=1'],
+            cwd=src, env=toolchain.env)
--- a/src/AudioConfig.cxx
+++ b/src/AudioConfig.cxx
@@ -1,52 +0,0 @@
-/*
- * Copyright (C) 2003-2014 The Music Player Daemon Project
- * http://www.musicpd.org
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
- */
-
-#include "config.h"
-#include "AudioConfig.hxx"
-#include "AudioFormat.hxx"
-#include "AudioParser.hxx"
-#include "config/ConfigData.hxx"
-#include "config/ConfigGlobal.hxx"
-#include "config/ConfigOption.hxx"
-#include "util/Error.hxx"
-#include "system/FatalError.hxx"
-
-static AudioFormat configured_audio_format;
-
-AudioFormat
-getOutputAudioFormat(AudioFormat inAudioFormat)
-{
-	AudioFormat out_audio_format = inAudioFormat;
-	out_audio_format.ApplyMask(configured_audio_format);
-	return out_audio_format;
-}
-
-void initAudioConfig(void)
-{
-	const struct config_param *param = config_get_param(CONF_AUDIO_OUTPUT_FORMAT);
-
-	if (param == nullptr)
-		return;
-
-	Error error;
-	if (!audio_format_parse(configured_audio_format, param->value.c_str(),
-				true, error))
-		FormatFatalError("error parsing line %i: %s",
-				 param->line, error.GetMessage());
-}
--- a/src/AudioFormat.cxx
+++ b/src/AudioFormat.cxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * Copyright 2003-2017 The Music Player Daemon Project
 * http://www.musicpd.org
 *
 * This program is free software; you can redistribute it and/or modify
--- a/src/AudioFormat.hxx
+++ b/src/AudioFormat.hxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * Copyright 2003-2017 The Music Player Daemon Project
 * http://www.musicpd.org
 *
 * This program is free software; you can redistribute it and/or modify
@@ -82,8 +82,19 @@ struct AudioFormat {
 	SampleFormat format;

 	/**
-	 * The number of channels.  Only mono (1) and stereo (2) are
-	 * fully supported currently.
+	 * The number of channels.
+	 *
+	 * Channel order follows the FLAC convention
+	 * (https://xiph.org/flac/format.html):
+	 *
+	 * - 1 channel: mono
+	 * - 2 channels: left, right
+	 * - 3 channels: left, right, center
+	 * - 4 channels: front left, front right, back left, back right
+	 * - 5 channels: front left, front right, front center, back/surround left, back/surround right
+	 * - 6 channels: front left, front right, front center, LFE, back/surround left, back/surround right
+	 * - 7 channels: front left, front right, front center, LFE, back center, side left, side right
+	 * - 8 channels: front left, front right, front center, LFE, back left, back right, side left, side right
 	 */
 	uint8_t channels;

@@ -99,8 +110,8 @@ struct AudioFormat {
 	}

 	/**
-	 * Clears the #audio_format object, i.e. sets all attributes to an
-	 * undefined (invalid) value.
+	 * Clears the object, i.e. sets all attributes to an undefined
+	 * (invalid) value.
 	 */
 	void Clear() {
 		sample_rate = 0;
@@ -148,6 +159,13 @@ struct AudioFormat {

 	void ApplyMask(AudioFormat mask);

+	gcc_pure
+	AudioFormat WithMask(AudioFormat mask) const {
+		AudioFormat result = *this;
+		result.ApplyMask(mask);
+		return result;
+	}
+
 	/**
 	 * Returns the size of each (mono) sample in bytes.
 	 */
@@ -185,8 +203,6 @@ audio_valid_sample_rate(unsigned sample_rate)

 /**
 * Checks whether the sample format is valid.
- *
- * @param bits the number of significant bits per sample
 */
 static inline bool
 audio_valid_sample_format(SampleFormat format)
@@ -289,10 +305,10 @@ AudioFormat::GetTimeToSize() const
 }

 /**
- * Renders a #sample_format enum into a string, e.g. for printing it
+ * Renders a #SampleFormat enum into a string, e.g. for printing it
 * in a log file.
 *
- * @param format a #sample_format enum value
+ * @param format a #SampleFormat enum value
 * @return the string
 */
 gcc_pure gcc_malloc
@@ -300,12 +316,12 @@ const char *
 sample_format_to_string(SampleFormat format);

 /**
- * Renders the #audio_format object into a string, e.g. for printing
+ * Renders the #AudioFormat object into a string, e.g. for printing
 * it in a log file.
 *
- * @param af the #audio_format object
+ * @param af the #AudioFormat object
 * @param s a buffer to print into
- * @return the string, or nullptr if the #audio_format object is invalid
+ * @return the string, or nullptr if the #AudioFormat object is invalid
 */
 gcc_pure gcc_malloc
 const char *
--- a/src/AudioParser.cxx
+++ b/src/AudioParser.cxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * Copyright 2003-2017 The Music Player Daemon Project
 * http://www.musicpd.org
 *
 * This program is free software; you can redistribute it and/or modify
@@ -25,73 +25,59 @@
 #include "config.h"
 #include "AudioParser.hxx"
 #include "AudioFormat.hxx"
-#include "CheckAudioFormat.hxx"
-#include "util/Error.hxx"
-#include "Compiler.h"
+#include "util/RuntimeError.hxx"

 #include <assert.h>
 #include <string.h>
 #include <stdlib.h>

-static bool
-parse_sample_rate(const char *src, bool mask, uint32_t *sample_rate_r,
-		  const char **endptr_r, Error &error)
+static uint32_t
+ParseSampleRate(const char *src, bool mask, const char **endptr_r)
 {
 	unsigned long value;
 	char *endptr;

 	if (mask && *src == '*') {
-		*sample_rate_r = 0;
 		*endptr_r = src + 1;
-		return true;
+		return 0;
 	}

 	value = strtoul(src, &endptr, 10);
 	if (endptr == src) {
-		error.Set(audio_format_domain,
-			  "Failed to parse the sample rate");
-		return false;
-	} else if (!audio_check_sample_rate(value, error))
-		return false;
+		throw std::runtime_error("Failed to parse the sample rate");
+	} else if (!audio_valid_sample_rate(value))
+		throw FormatRuntimeError("Invalid sample rate: %lu",
+					 value);

-	*sample_rate_r = value;
 	*endptr_r = endptr;
-	return true;
+	return value;
 }

-static bool
-parse_sample_format(const char *src, bool mask,
-		    SampleFormat *sample_format_r,
-		    const char **endptr_r, Error &error)
+static SampleFormat
+ParseSampleFormat(const char *src, bool mask, const char **endptr_r)
 {
 	unsigned long value;
 	char *endptr;
 	SampleFormat sample_format;

 	if (mask && *src == '*') {
-		*sample_format_r = SampleFormat::UNDEFINED;
 		*endptr_r = src + 1;
-		return true;
+		return SampleFormat::UNDEFINED;
 	}

 	if (*src == 'f') {
-		*sample_format_r = SampleFormat::FLOAT;
 		*endptr_r = src + 1;
-		return true;
+		return SampleFormat::FLOAT;
 	}

 	if (memcmp(src, "dsd", 3) == 0) {
-		*sample_format_r = SampleFormat::DSD;
 		*endptr_r = src + 3;
-		return true;
+		return SampleFormat::DSD;
 	}

 	value = strtoul(src, &endptr, 10);
-	if (endptr == src) {
-		error.Set(audio_format_domain,
-			  "Failed to parse the sample format");
-		return false;
-	}
+	if (endptr == src)
+		throw std::runtime_error("Failed to parse the sample format");

 	switch (value) {
 	case 8:
@@ -115,99 +101,65 @@ parse_sample_format(const char *src, bool mask,
 		break;

 	default:
-		error.Format(audio_format_domain,
-			     "Invalid sample format: %lu", value);
-		return false;
+		throw FormatRuntimeError("Invalid sample format: %lu", value);
 	}

 	assert(audio_valid_sample_format(sample_format));

-	*sample_format_r = sample_format;
 	*endptr_r = endptr;
-	return true;
+	return sample_format;
 }

-static bool
-parse_channel_count(const char *src, bool mask, uint8_t *channels_r,
-		    const char **endptr_r, Error &error)
+static uint8_t
+ParseChannelCount(const char *src, bool mask, const char **endptr_r)
 {
 	unsigned long value;
 	char *endptr;

 	if (mask && *src == '*') {
-		*channels_r = 0;
 		*endptr_r = src + 1;
-		return true;
+		return 0;
 	}

 	value = strtoul(src, &endptr, 10);
-	if (endptr == src) {
-		error.Set(audio_format_domain,
-			  "Failed to parse the channel count");
-		return false;
-	} else if (!audio_check_channel_count(value, error))
-		return false;
+	if (endptr == src)
+		throw std::runtime_error("Failed to parse the channel count");
+	else if (!audio_valid_channel_count(value))
+		throw FormatRuntimeError("Invalid channel count: %u", value);

-	*channels_r = value;
 	*endptr_r = endptr;
-	return true;
+	return value;
 }

-bool
-audio_format_parse(AudioFormat &dest, const char *src,
-		   bool mask, Error &error)
+AudioFormat
+ParseAudioFormat(const char *src, bool mask)
 {
-	uint32_t rate;
-	SampleFormat sample_format;
-	uint8_t channels;
-
+	AudioFormat dest;
 	dest.Clear();

 	/* parse sample rate */

-#if GCC_CHECK_VERSION(4,7)
-	/* workaround -Wmaybe-uninitialized false positive */
-	rate = 0;
-#endif
+	dest.sample_rate = ParseSampleRate(src, mask, &src);

-	if (!parse_sample_rate(src, mask, &rate, &src, error))
-		return false;
-
-	if (*src++ != ':') {
-		error.Set(audio_format_domain, "Sample format missing");
-		return false;
-	}
+	if (*src++ != ':')
+		throw std::runtime_error("Sample format missing");

 	/* parse sample format */

-#if GCC_CHECK_VERSION(4,7)
-	/* workaround -Wmaybe-uninitialized false positive */
-	sample_format = SampleFormat::UNDEFINED;
-#endif
+	dest.format = ParseSampleFormat(src, mask, &src);

-	if (!parse_sample_format(src, mask, &sample_format, &src, error))
-		return false;
-
-	if (*src++ != ':') {
-		error.Set(audio_format_domain, "Channel count missing");
-		return false;
-	}
+	if (*src++ != ':')
+		throw std::runtime_error("Channel count missing");

 	/* parse channel count */

-	if (!parse_channel_count(src, mask, &channels, &src, error))
-		return false;
+	dest.channels = ParseChannelCount(src, mask, &src);

-	if (*src != 0) {
-		error.Format(audio_format_domain,
-			    "Extra data after channel count: %s", src);
-		return false;
-	}
+	if (*src != 0)
+		throw FormatRuntimeError("Extra data after channel count: %s", src);

-	dest = AudioFormat(rate, sample_format, channels);
 	assert(mask
 	       ? dest.IsMaskValid()
 	       : dest.IsValid());
-
-	return true;
+	return dest;
 }
--- a/src/AudioParser.hxx
+++ b/src/AudioParser.hxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * Copyright 2003-2017 The Music Player Daemon Project
 * http://www.musicpd.org
 *
 * This program is free software; you can redistribute it and/or modify
@@ -25,22 +25,21 @@
 #ifndef MPD_AUDIO_PARSER_HXX
 #define MPD_AUDIO_PARSER_HXX

+#include "Compiler.h"
+
 struct AudioFormat;
-class Error;

 /**
 * Parses a string in the form "SAMPLE_RATE:BITS:CHANNELS" into an
- * #audio_format.
+ * #AudioFormat.
+ *
+ * Throws #std::runtime_error on error.
 *
- * @param dest the destination #audio_format struct
 * @param src the input string
 * @param mask if true, then "*" is allowed for any number of items
- * @param error_r location to store the error occurring, or NULL to
- * ignore errors
- * @return true on success
 */
-bool
-audio_format_parse(AudioFormat &dest, const char *src,
-		   bool mask, Error &error);
+gcc_pure
+AudioFormat
+ParseAudioFormat(const char *src, bool mask);

 #endif
--- a/src/BulkEdit.hxx
+++ b/src/BulkEdit.hxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * Copyright 2003-2017 The Music Player Daemon Project
 * http://www.musicpd.org
 *
 * This program is free software; you can redistribute it and/or modify
--- a/src/CheckAudioFormat.cxx
+++ b/src/CheckAudioFormat.cxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * Copyright 2003-2017 The Music Player Daemon Project
 * http://www.musicpd.org
 *
 * This program is free software; you can redistribute it and/or modify
@@ -20,61 +20,43 @@
 #include "config.h"
 #include "CheckAudioFormat.hxx"
 #include "AudioFormat.hxx"
-#include "util/Error.hxx"
-#include "util/Domain.hxx"
+#include "util/RuntimeError.hxx"
+
+#include <stdexcept>

 #include <assert.h>

-const Domain audio_format_domain("audio_format");
-
-bool
-audio_check_sample_rate(unsigned long sample_rate, Error &error)
+void
+CheckSampleRate(unsigned long sample_rate)
 {
-	if (!audio_valid_sample_rate(sample_rate)) {
-		error.Format(audio_format_domain,
-			     "Invalid sample rate: %lu", sample_rate);
-		return false;
-	}
-
-	return true;
+	if (!audio_valid_sample_rate(sample_rate))
+		throw FormatRuntimeError("Invalid sample rate: %lu",
+					 sample_rate);
 }

-bool
-audio_check_sample_format(SampleFormat sample_format, Error &error)
+void
+CheckSampleFormat(SampleFormat sample_format)
 {
-	if (!audio_valid_sample_format(sample_format)) {
-		error.Format(audio_format_domain,
-			     "Invalid sample format: %u",
-			     unsigned(sample_format));
-		return false;
-	}
-
-	return true;
+	if (!audio_valid_sample_format(sample_format))
+		throw FormatRuntimeError("Invalid sample format: %u",
+					 unsigned(sample_format));
 }

-bool
-audio_check_channel_count(unsigned channels, Error &error)
+void
+CheckChannelCount(unsigned channels)
 {
-	if (!audio_valid_channel_count(channels)) {
-		error.Format(audio_format_domain,
-			     "Invalid channel count: %u", channels);
-		return false;
-	}
-
-	return true;
+	if (!audio_valid_channel_count(channels))
+		throw FormatRuntimeError("Invalid channel count: %u",
+					 channels);
 }

-bool
-audio_format_init_checked(AudioFormat &af, unsigned long sample_rate,
-			  SampleFormat sample_format, unsigned channels,
-			  Error &error)
+AudioFormat
+CheckAudioFormat(unsigned long sample_rate,
+		 SampleFormat sample_format, unsigned channels)
 {
-	if (audio_check_sample_rate(sample_rate, error) &&
-	    audio_check_sample_format(sample_format, error) &&
-	    audio_check_channel_count(channels, error)) {
-		af = AudioFormat(sample_rate, sample_format, channels);
-		assert(af.IsValid());
-		return true;
-	} else
-		return false;
+	CheckSampleRate(sample_rate);
+	CheckSampleFormat(sample_format);
+	CheckChannelCount(channels);
+
+	return AudioFormat(sample_rate, sample_format, channels);
 }
--- a/src/CheckAudioFormat.hxx
+++ b/src/CheckAudioFormat.hxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * Copyright 2003-2017 The Music Player Daemon Project
 * http://www.musicpd.org
 *
 * This program is free software; you can redistribute it and/or modify
@@ -22,25 +22,23 @@

 #include "AudioFormat.hxx"

-class Error;
+void
+CheckSampleRate(unsigned long sample_rate);

-extern const class Domain audio_format_domain;
+void
+CheckSampleFormat(SampleFormat sample_format);

-bool
-audio_check_sample_rate(unsigned long sample_rate, Error &error);
-
-bool
-audio_check_sample_format(SampleFormat sample_format, Error &error);
-
-bool
-audio_check_channel_count(unsigned sample_format, Error &error);
+void
+CheckChannelCount(unsigned sample_format);

 /**
- * Wrapper for audio_format_init(), which checks all attributes.
+ * Check #AudioFormat attributes and construct an #AudioFormat
+ * instance.
+ *
+ * Throws #std::runtime_error on error.
 */
-bool
-audio_format_init_checked(AudioFormat &af, unsigned long sample_rate,
-			  SampleFormat sample_format, unsigned channels,
-			  Error &error);
+AudioFormat
+CheckAudioFormat(unsigned long sample_rate,
+		 SampleFormat sample_format, unsigned channels);

 #endif
--- a/src/Chrono.hxx
+++ b/src/Chrono.hxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * Copyright 2003-2017 The Music Player Daemon Project
 * http://www.musicpd.org
 *
 * This program is free software; you can redistribute it and/or modify
@@ -20,19 +20,10 @@
 #ifndef MPD_CHRONO_HXX
 #define MPD_CHRONO_HXX

-#include "Compiler.h"
-
 #include <chrono>
 #include <utility>
 #include <cstdint>

-#if defined(__GNUC__) && !GCC_CHECK_VERSION(4,7) && !defined(__clang__)
-/* std::chrono::duration operators are "constexpr" since gcc 4.7 */
-#define chrono_constexpr gcc_pure
-#else
-#define chrono_constexpr constexpr
-#endif
-
 /**
 * A time stamp within a song.  Granularity is 1 millisecond and the
 * maximum value is about 49 days.
@@ -108,11 +99,11 @@ public:
 		return count() > 0;
 	}

-	chrono_constexpr SongTime operator+(const SongTime &other) const {
+	constexpr SongTime operator+(const SongTime &other) const {
 		return SongTime(*(const Base *)this + (const Base &)other);
 	}

-	chrono_constexpr SongTime operator-(const SongTime &other) const {
+	constexpr SongTime operator-(const SongTime &other) const {
 		return SongTime(*(const Base *)this - (const Base &)other);
 	}
 };
@@ -212,15 +203,13 @@ public:
 		return count() < 0;
 	}

-	chrono_constexpr SignedSongTime operator+(const SignedSongTime &other) const {
+	constexpr SignedSongTime operator+(const SignedSongTime &other) const {
 		return SignedSongTime(*(const Base *)this + (const Base &)other);
 	}

-	chrono_constexpr SignedSongTime operator-(const SignedSongTime &other) const {
+	constexpr SignedSongTime operator-(const SignedSongTime &other) const {
 		return SignedSongTime(*(const Base *)this - (const Base &)other);
 	}
 };

-#undef chrono_constexpr
-
 #endif
--- a/src/CommandLine.cxx
+++ b/src/CommandLine.cxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * Copyright 2003-2017 The Music Player Daemon Project
 * http://www.musicpd.org
 *
 * This program is free software; you can redistribute it and/or modify
@@ -35,7 +35,9 @@
 #include "fs/Traits.hxx"
 #include "fs/FileSystem.hxx"
 #include "fs/StandardDirectory.hxx"
-#include "util/Error.hxx"
+#include "system/Error.hxx"
+#include "util/Macros.hxx"
+#include "util/RuntimeError.hxx"
 #include "util/Domain.hxx"
 #include "util/OptionDef.hxx"
 #include "util/OptionParser.hxx"
@@ -66,12 +68,12 @@
 #include <stdlib.h>

 #ifdef WIN32
-#define CONFIG_FILE_LOCATION		"mpd\\mpd.conf"
-#define APP_CONFIG_FILE_LOCATION	"conf\\mpd.conf"
+#define CONFIG_FILE_LOCATION PATH_LITERAL("mpd\\mpd.conf")
+#define APP_CONFIG_FILE_LOCATION PATH_LITERAL("conf\\mpd.conf")
 #else
-#define USER_CONFIG_FILE_LOCATION1	".mpdconf"
-#define USER_CONFIG_FILE_LOCATION2	".mpd/mpd.conf"
-#define USER_CONFIG_FILE_LOCATION_XDG	"mpd/mpd.conf"
+#define USER_CONFIG_FILE_LOCATION1 PATH_LITERAL(".mpdconf")
+#define USER_CONFIG_FILE_LOCATION2 PATH_LITERAL(".mpd/mpd.conf")
+#define USER_CONFIG_FILE_LOCATION_XDG PATH_LITERAL("mpd/mpd.conf")
 #endif

 static constexpr OptionDef opt_kill(
@@ -98,40 +100,44 @@ static constexpr Domain cmdline_domain("cmdline");
 gcc_noreturn
 static void version(void)
 {
-	puts("Music Player Daemon " VERSION
+	printf("Music Player Daemon " VERSION
 #ifdef GIT_COMMIT
-	     " (" GIT_COMMIT ")"
+	       " (" GIT_COMMIT ")"
 #endif
-	     "\n"
-	     "\n"
-	     "Copyright (C) 2003-2007 Warren Dukes <warren.dukes@gmail.com>\n"
-	     "Copyright (C) 2008-2014 Max Kellermann <max@duempel.org>\n"
-	     "This is free software; see the source for copying conditions.  There is NO\n"
-	     "warranty; not even MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n");
+	       "\n"
+	       "\n"
+	       "Copyright (C) 2003-2007 Warren Dukes <warren.dukes@gmail.com>\n"
+	       "Copyright (C) 2008-2015 Max Kellermann <max@duempel.org>\n"
+	       "This is free software; see the source for copying conditions.  There is NO\n"
+	       "warranty; not even MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n"

 #ifdef ENABLE_DATABASE
-	puts("\n"
-	     "Database plugins:");
+	       "\n"
+	       "Database plugins:\n");

 	for (auto i = database_plugins; *i != nullptr; ++i)
 		printf(" %s", (*i)->name);

-	puts("\n\n"
-	     "Storage plugins:");
+	printf("\n\n"
+	       "Storage plugins:\n");

 	for (auto i = storage_plugins; *i != nullptr; ++i)
 		printf(" %s", (*i)->name);
+
+	printf("\n"
 #endif

 #ifdef ENABLE_NEIGHBOR_PLUGINS
-	puts("\n\n"
-	     "Neighbor plugins:");
+	       "\n"
+	       "Neighbor plugins:\n");
 	for (auto i = neighbor_plugins; *i != nullptr; ++i)
 		printf(" %s", (*i)->name);
+
+	printf("\n"
 #endif

-	puts("\n\n"
-	     "Decoders plugins:");
+	       "\n"
+	       "Decoders plugins:\n");

 	decoder_plugins_for_each([](const DecoderPlugin &plugin){
 			printf(" [%s]", plugin.name);
@@ -141,26 +147,39 @@ static void version(void)
 				for (; *suffixes != nullptr; ++suffixes)
 					printf(" %s", *suffixes);

-			puts("");
+			printf("\n");
 		});

-	puts("\n"
-	     "Output plugins:");
+	printf("\n"
+	       "Filters:\n"
+#ifdef ENABLE_LIBSAMPLERATE
+	       " libsamplerate"
+#endif
+#ifdef ENABLE_SOXR
+	       " soxr"
+#endif
+	       "\n\n"
+	       "Tag plugins:\n"
+#ifdef ENABLE_ID3TAG
+	       " id3tag"
+#endif
+	       "\n\n"
+	       "Output plugins:\n");
 	audio_output_plugins_for_each(plugin)
 		printf(" %s", plugin->name);
-	puts("");
+	printf("\n"

 #ifdef ENABLE_ENCODER
-	puts("\n"
-	     "Encoder plugins:");
+	       "\n"
+	       "Encoder plugins:\n");
 	encoder_plugins_for_each(plugin)
 		printf(" %s", plugin->name);
-	puts("");
+	printf("\n"
 #endif

 #ifdef ENABLE_ARCHIVE
-	puts("\n"
-	     "Archive plugins:");
+	       "\n"
+	       "Archive plugins:\n");
 	archive_plugins_for_each(plugin) {
 		printf(" [%s]", plugin->name);

@@ -169,24 +188,57 @@ static void version(void)
 			for (; *suffixes != nullptr; ++suffixes)
 				printf(" %s", *suffixes);

-		puts("");
+		printf("\n");
 	}
+
+	printf(""
 #endif

-	puts("\n"
-	     "Input plugins:");
+	       "\n"
+	       "Input plugins:\n");
 	input_plugins_for_each(plugin)
 		printf(" %s", plugin->name);

-	puts("\n\n"
-	     "Playlist plugins:");
+	printf("\n\n"
+	       "Playlist plugins:\n");
 	playlist_plugins_for_each(plugin)
 		printf(" %s", plugin->name);

-	puts("\n\n"
-	     "Protocols:");
+	printf("\n\n"
+	       "Protocols:\n");
 	print_supported_uri_schemes_to_fp(stdout);

+	printf("\n"
+	       "Other features:\n"
+#ifdef HAVE_AVAHI
+	       " avahi"
+#endif
+#ifdef USE_EPOLL
+	       " epoll"
+#endif
+#ifdef HAVE_ICONV
+	       " iconv"
+#endif
+#ifdef HAVE_ICU
+	       " icu"
+#endif
+#ifdef ENABLE_INOTIFY
+	       " inotify"
+#endif
+#ifdef HAVE_IPV6
+	       " ipv6"
+#endif
+#ifdef ENABLE_SYSTEMD_DAEMON
+	       " systemd"
+#endif
+#ifdef HAVE_TCP
+	       " tcp"
+#endif
+#ifdef HAVE_UN
+	       " un"
+#endif
+	       "\n");
+
 	exit(EXIT_SUCCESS);
 }

@@ -206,12 +258,12 @@ static void PrintOption(const OptionDef &opt)
 gcc_noreturn
 static void help(void)
 {
-	puts("Usage:\n"
-	     "  mpd [OPTION...] [path/to/mpd.conf]\n"
-	     "\n"
-	     "Music Player Daemon - a daemon for playing music.\n"
-	     "\n"
-	     "Options:");
+	printf("Usage:\n"
+	       "  mpd [OPTION...] [path/to/mpd.conf]\n"
+	       "\n"
+	       "Music Player Daemon - a daemon for playing music.\n"
+	       "\n"
+	       "Options:\n");

 	PrintOption(opt_help);
 	PrintOption(opt_kill);
@@ -226,29 +278,23 @@ static void help(void)

 class ConfigLoader
 {
-	Error &error;
-	bool result;
 public:
-	ConfigLoader(Error &_error) : error(_error), result(false) { }
-
-	bool GetResult() const { return result; }
-
 	bool TryFile(const Path path);
 	bool TryFile(const AllocatedPath &base_path,
-		     PathTraitsFS::const_pointer path);
+		     PathTraitsFS::const_pointer_type path);
 };

 bool ConfigLoader::TryFile(Path path)
 {
 	if (FileExists(path)) {
-		result = ReadConfigFile(path, error);
+		ReadConfigFile(path);
 		return true;
 	}
 	return false;
 }

 bool ConfigLoader::TryFile(const AllocatedPath &base_path,
-			   PathTraitsFS::const_pointer path)
+			   PathTraitsFS::const_pointer_type path)
 {
 	if (base_path.IsNull())
 		return false;
@@ -256,9 +302,8 @@ bool ConfigLoader::TryFile(const AllocatedPath &base_path,
 	return TryFile(full_path);
 }

-bool
-parse_cmdline(int argc, char **argv, struct options *options,
-	      Error &error)
+void
+ParseCommandLine(int argc, char **argv, struct options *options)
 {
 	bool use_config_file = true;
 	options->kill = false;
@@ -296,9 +341,8 @@ parse_cmdline(int argc, char **argv, struct options *options,
 		if (parser.CheckOption(opt_help, opt_help_alt))
 			help();

-		error.Format(cmdline_domain, "invalid option: %s",
-			     parser.GetOption());
-		return false;
+		throw FormatRuntimeError("invalid option: %s",
+					 parser.GetOption());
 	}

 	/* initialize the logging library, so the configuration file
@@ -308,7 +352,7 @@ parse_cmdline(int argc, char **argv, struct options *options,
 	if (!use_config_file) {
 		LogDebug(cmdline_domain,
 			 "Ignoring config, using daemon defaults");
-		return true;
+		return;
 	}

 	// Second pass: find non-option parameters (i.e. config file)
@@ -320,18 +364,29 @@ parse_cmdline(int argc, char **argv, struct options *options,
 			config_file = argv[i];
 			continue;
 		}
-		error.Set(cmdline_domain, "too many arguments");
-		return false;
+
+		throw std::runtime_error("too many arguments");
 	}

 	if (config_file != nullptr) {
 		/* use specified configuration file */
-		return ReadConfigFile(Path::FromFS(config_file), error);
+#ifdef _UNICODE
+		wchar_t buffer[MAX_PATH];
+		auto result = MultiByteToWideChar(CP_ACP, 0, config_file, -1,
+						  buffer, ARRAY_SIZE(buffer));
+		if (result <= 0)
+			throw MakeLastError("MultiByteToWideChar() failed");
+
+		ReadConfigFile(Path::FromFS(buffer));
+#else
+		ReadConfigFile(Path::FromFS(config_file));
+#endif
+		return;
 	}

 	/* use default configuration file path */

-	ConfigLoader loader(error);
+	ConfigLoader loader;

 	bool found =
 #ifdef WIN32
@@ -345,10 +400,6 @@ parse_cmdline(int argc, char **argv, struct options *options,
 		loader.TryFile(GetHomeDir(), USER_CONFIG_FILE_LOCATION2) ||
 		loader.TryFile(Path::FromFS(SYSTEM_CONFIG_FILE_LOCATION));
 #endif
-	if (!found) {
-		error.Set(cmdline_domain, "No configuration file found");
-		return false;
-	}
-
-	return loader.GetResult();
+	if (!found)
+		throw std::runtime_error("No configuration file found");
 }
--- a/src/CommandLine.hxx
+++ b/src/CommandLine.hxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * Copyright 2003-2017 The Music Player Daemon Project
 * http://www.musicpd.org
 *
 * This program is free software; you can redistribute it and/or modify
@@ -20,8 +20,6 @@
 #ifndef MPD_COMMAND_LINE_HXX
 #define MPD_COMMAND_LINE_HXX

-class Error;
-
 struct options {
 	bool kill;
 	bool daemon;
@@ -29,8 +27,7 @@ struct options {
 	bool verbose;
 };

-bool
-parse_cmdline(int argc, char **argv, struct options *options,
-	      Error &error);
+void
+ParseCommandLine(int argc, char **argv, struct options *options);

 #endif
--- a/src/Compiler.h
+++ b/src/Compiler.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * Copyright 2003-2017 The Music Player Daemon Project
 * http://www.musicpd.org
 *
 * This program is free software; you can redistribute it and/or modify
@@ -20,34 +20,62 @@
 #ifndef COMPILER_H
 #define COMPILER_H

-#define GCC_CHECK_VERSION(major, minor) \
-  (defined(__GNUC__) &&                                                 \
-   (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor))))
+#define GCC_MAKE_VERSION(major, minor, patchlevel) ((major) * 10000 + (minor) * 100 + patchlevel)

 #ifdef __GNUC__
-#define GCC_VERSION (__GNUC__ * 10000 \
-                     + __GNUC_MINOR__ * 100 \
-                     + __GNUC_PATCHLEVEL__)
+#define GCC_VERSION GCC_MAKE_VERSION(__GNUC__, __GNUC_MINOR__, __GNUC_PATCHLEVEL__)
 #else
 #define GCC_VERSION 0
 #endif

 #ifdef __clang__
-#  define CLANG_VERSION (__clang_major__ * 10000 \
-			 + __clang_minor__ * 100 \
-			 + __clang_patchlevel__)
+#  define CLANG_VERSION GCC_MAKE_VERSION(__clang_major__, __clang_minor__, __clang_patchlevel__)
+#elif defined(__GNUC__)
+#  define CLANG_VERSION 0
+#endif
+
+/**
+ * Are we building with the specified version of gcc (not clang or any
+ * other compiler) or newer?
+ */
+#define GCC_CHECK_VERSION(major, minor) \
+	(CLANG_VERSION == 0 && \
+	 GCC_VERSION >= GCC_MAKE_VERSION(major, minor, 0))
+
+/**
+ * Are we building with clang (any version) or at least the specified
+ * gcc version?
+ */
+#define CLANG_OR_GCC_VERSION(major, minor) \
+	(CLANG_VERSION > 0 || GCC_CHECK_VERSION(major, minor))
+
+/**
+ * Are we building with gcc (not clang or any other compiler) and a
+ * version older than the specified one?
+ */
+#define GCC_OLDER_THAN(major, minor) \
+	(GCC_VERSION > 0 && CLANG_VERSION == 0 && \
+	 GCC_VERSION < GCC_MAKE_VERSION(major, minor, 0))
+
+#ifdef __clang__
 #  if __clang_major__ < 3
 #    error Sorry, your clang version is too old.  You need at least version 3.1.
 #  endif
 #elif defined(__GNUC__)
-#  if !GCC_CHECK_VERSION(4,6)
-#    error Sorry, your gcc version is too old.  You need at least version 4.6.
+#  if GCC_OLDER_THAN(4,9)
+#    error Sorry, your gcc version is too old.  You need at least version 4.9.
 #  endif
 #else
 #  warning Untested compiler.  Use at your own risk!
 #endif

-#if GCC_CHECK_VERSION(4,0)
+/**
+ * Are we building with the specified version of clang or newer?
+ */
+#define CLANG_CHECK_VERSION(major, minor) \
+	(CLANG_VERSION >= GCC_MAKE_VERSION(major, minor, 0))
+
+#if CLANG_OR_GCC_VERSION(4,0)

 /* GCC 4.x */

@@ -69,8 +97,6 @@
 #define gcc_likely(x) __builtin_expect (!!(x), 1)
 #define gcc_unlikely(x) __builtin_expect (!!(x), 0)

-#define gcc_aligned(n) __attribute__((aligned(n)))
-
 #define gcc_visibility_hidden __attribute__((visibility("hidden")))
 #define gcc_visibility_default __attribute__((visibility("default")))

@@ -98,8 +124,6 @@
 #define gcc_likely(x) (x)
 #define gcc_unlikely(x) (x)

-#define gcc_aligned(n)
-
 #define gcc_visibility_hidden
 #define gcc_visibility_default

@@ -107,7 +131,7 @@

 #endif

-#if GCC_CHECK_VERSION(4,3)
+#if CLANG_OR_GCC_VERSION(4,3)

 #define gcc_hot __attribute__((hot))
 #define gcc_cold __attribute__((cold))
@@ -119,7 +143,7 @@

 #endif /* ! GCC_UNUSED >= 40300 */

-#if GCC_CHECK_VERSION(4,6) && !defined(__clang__)
+#if GCC_CHECK_VERSION(4,6)
 #define gcc_flatten __attribute__((flatten))
 #else
 #define gcc_flatten
@@ -128,7 +152,7 @@
 #ifndef __cplusplus
 /* plain C99 has "restrict" */
 #define gcc_restrict restrict
-#elif GCC_CHECK_VERSION(4,0)
+#elif CLANG_OR_GCC_VERSION(4,0)
 /* "__restrict__" is a GCC extension for C++ */
 #define gcc_restrict __restrict__
 #else
@@ -136,24 +160,6 @@
 #define gcc_restrict
 #endif

-/* C++11 features */
-
-#if defined(__cplusplus)
-
-/* support for C++11 "override" was added in gcc 4.7 */
-#if !defined(__clang__) && !GCC_CHECK_VERSION(4,7)
-#define override
-#define final
-#endif
-
-#if defined(__clang__) || GCC_CHECK_VERSION(4,8)
-#define gcc_alignas(T, fallback) alignas(T)
-#else
-#define gcc_alignas(T, fallback) gcc_aligned(fallback)
-#endif
-
-#endif
-
 #ifndef __has_feature
  // define dummy macro for non-clang compilers
  #define __has_feature(x) 0
--- a/src/DetachedSong.cxx
+++ b/src/DetachedSong.cxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * Copyright 2003-2017 The Music Player Daemon Project
 * http://www.musicpd.org
 *
 * This program is free software; you can redistribute it and/or modify
--- a/src/DetachedSong.hxx
+++ b/src/DetachedSong.hxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * Copyright 2003-2017 The Music Player Daemon Project
 * http://www.musicpd.org
 *
 * This program is free software; you can redistribute it and/or modify
@@ -32,9 +32,9 @@

 struct LightSong;
 class Storage;
+class Path;

 class DetachedSong {
-	friend DetachedSong map_song_detach(const LightSong &song);
 	friend DetachedSong DatabaseDetachSong(const Storage &db,
 					       const LightSong &song);

@@ -146,7 +146,9 @@ public:
 	 */
 	gcc_pure
 	bool IsSame(const DetachedSong &other) const {
-		return uri == other.uri;
+		return uri == other.uri &&
+			start_time == other.start_time &&
+			end_time == other.end_time;
 	}

 	gcc_pure gcc_nonnull_all
@@ -188,6 +190,14 @@ public:
 		tag = std::move(other.tag);
 	}

+	/**
+	 * Similar to the MoveTagFrom(), but move only the #TagItem
+	 * array.
+	 */
+	void MoveTagItemsFrom(DetachedSong &&other) {
+		tag.MoveItemsFrom(std::move(other.tag));
+	}
+
 	time_t GetLastModified() const {
 		return mtime;
 	}
@@ -221,6 +231,11 @@ public:
 	 * @return true on success
 	 */
 	bool Update();
+
+	/**
+	 * Load #tag and #mtime from a local file.
+	 */
+	bool LoadFile(Path path);
 };

 #endif
--- a/src/GlobalEvents.cxx
+++ b/src/GlobalEvents.cxx
@@ -1,96 +0,0 @@
-/*
- * Copyright (C) 2003-2014 The Music Player Daemon Project
- * http://www.musicpd.org
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
- */
-
-#include "config.h"
-#include "GlobalEvents.hxx"
-#include "util/Manual.hxx"
-#include "event/DeferredMonitor.hxx"
-
-#include <atomic>
-
-#include <assert.h>
-
-namespace GlobalEvents {
-	class Monitor final : public DeferredMonitor {
-	public:
-		Monitor(EventLoop &_loop):DeferredMonitor(_loop) {}
-
-	protected:
-		virtual void RunDeferred() override;
-	};
-
-	static Manual<Monitor> monitor;
-
-	static std::atomic_uint flags;
-	static Handler handlers[MAX];
-}
-
-/**
- * Invoke the callback for a certain event.
- */
-static void
-InvokeGlobalEvent(GlobalEvents::Event event)
-{
-	assert((unsigned)event < GlobalEvents::MAX);
-	assert(GlobalEvents::handlers[event] != nullptr);
-
-	GlobalEvents::handlers[event]();
-}
-
-void
-GlobalEvents::Monitor::RunDeferred()
-{
-	const unsigned f = flags.exchange(0);
-
-	for (unsigned i = 0; i < MAX; ++i)
-		if (f & (1u << i))
-			/* invoke the event handler */
-			InvokeGlobalEvent(Event(i));
-}
-
-void
-GlobalEvents::Initialize(EventLoop &loop)
-{
-	monitor.Construct(loop);
-}
-
-void
-GlobalEvents::Deinitialize()
-{
-	monitor.Destruct();
-}
-
-void
-GlobalEvents::Register(Event event, Handler callback)
-{
-	assert((unsigned)event < MAX);
-	assert(handlers[event] == nullptr);
-
-	handlers[event] = callback;
-}
-
-void
-GlobalEvents::Emit(Event event)
-{
-	assert((unsigned)event < MAX);
-
-	const unsigned mask = 1u << unsigned(event);
-	if (GlobalEvents::flags.fetch_or(mask) == 0)
-		monitor->Schedule();
-}
--- a/src/GlobalEvents.hxx
+++ b/src/GlobalEvents.hxx
@@ -1,64 +0,0 @@
-/*
- * Copyright (C) 2003-2014 The Music Player Daemon Project
- * http://www.musicpd.org
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
- */
-
-#ifndef MPD_GLOBAL_EVENTS_HXX
-#define MPD_GLOBAL_EVENTS_HXX
-
-#ifdef WIN32
-#include <windows.h>
-/* DELETE is a WIN32 macro that poisons our namespace; this is a
-   kludge to allow us to use it anyway */
-#ifdef DELETE
-#undef DELETE
-#endif
-#endif
-
-class EventLoop;
-
-namespace GlobalEvents {
-	enum Event {
-		/** an idle event was emitted */
-		IDLE,
-
-		/** must call playlist_sync() */
-		PLAYLIST,
-
-		/** the current song's tag has changed */
-		TAG,
-
-#ifdef WIN32
-		/** shutdown requested */
-		SHUTDOWN,
-#endif
-
-		MAX
-	};
-
-	typedef void (*Handler)();
-
-	void Initialize(EventLoop &loop);
-
-	void Deinitialize();
-
-	void Register(Event event, Handler handler);
-
-	void Emit(Event event);
-}
-
-#endif /* MAIN_NOTIFY_H */
--- a/src/IOThread.cxx
+++ b/src/IOThread.cxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * Copyright 2003-2017 The Music Player Daemon Project
 * http://www.musicpd.org
 *
 * This program is free software; you can redistribute it and/or modify
@@ -24,8 +24,6 @@
 #include "thread/Thread.hxx"
 #include "thread/Name.hxx"
 #include "event/Loop.hxx"
-#include "system/FatalError.hxx"
-#include "util/Error.hxx"

 #include <assert.h>

@@ -74,11 +72,8 @@ io_thread_start()
 	assert(io.loop != nullptr);
 	assert(!io.thread.IsDefined());

-	const ScopeLock protect(io.mutex);
-
-	Error error;
-	if (!io.thread.Start(io_thread_func, nullptr, error))
-		FatalError(error);
+	const std::lock_guard<Mutex> protect(io.mutex);
+	io.thread.Start(io_thread_func, nullptr);
 }

 void
--- a/src/IOThread.hxx
+++ b/src/IOThread.hxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * Copyright 2003-2017 The Music Player Daemon Project
 * http://www.musicpd.org
 *
 * This program is free software; you can redistribute it and/or modify
@@ -25,7 +25,7 @@
 class EventLoop;

 void
-io_thread_init(void);
+io_thread_init();

 void
 io_thread_start();
@@ -36,7 +36,7 @@ io_thread_start();
 * only.
 */
 void
-io_thread_run(void);
+io_thread_run();

 /**
 * Ask the I/O thread to quit, but does not wait for it.  Usually, you
@@ -44,10 +44,10 @@ io_thread_run(void);
 * includes this.
 */
 void
-io_thread_quit(void);
+io_thread_quit();

 void
-io_thread_deinit(void);
+io_thread_deinit();

 gcc_const
 EventLoop &
@@ -58,6 +58,6 @@ io_thread_get();
 */
 gcc_pure
 bool
-io_thread_inside(void);
+io_thread_inside();

 #endif
--- a/src/IcyMetaDataParser.cxx
+++ b/src/IcyMetaDataParser.cxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * Copyright 2003-2017 The Music Player Daemon Project
 * http://www.musicpd.org
 *
 * This program is free software; you can redistribute it and/or modify
@@ -22,6 +22,7 @@
 #include "tag/Tag.hxx"
 #include "tag/TagBuilder.hxx"
 #include "util/Domain.hxx"
+#include "util/StringView.hxx"
 #include "Log.hxx"

 #include <assert.h>
@@ -76,7 +77,7 @@ icy_add_item(TagBuilder &tag, TagType type, const char *value)
 	}

 	if (length > 0)
-		tag.AddItem(type, value, length);
+		tag.AddItem(type, {value, length});
 }

 static void
--- a/src/IcyMetaDataParser.hxx
+++ b/src/IcyMetaDataParser.hxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * Copyright 2003-2017 The Music Player Daemon Project
 * http://www.musicpd.org
 *
 * This program is free software; you can redistribute it and/or modify
--- a/src/Idle.cxx
+++ b/src/Idle.cxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * Copyright 2003-2017 The Music Player Daemon Project
 * http://www.musicpd.org
 *
 * This program is free software; you can redistribute it and/or modify
@@ -24,63 +24,15 @@

 #include "config.h"
 #include "Idle.hxx"
-#include "GlobalEvents.hxx"
-#include "util/ASCII.hxx"
-
-#include <atomic>
+#include "Main.hxx"
+#include "Instance.hxx"

 #include <assert.h>

-static std::atomic_uint idle_flags;
-
-static const char *const idle_names[] = {
-	"database",
-	"stored_playlist",
-	"playlist",
-	"player",
-	"mixer",
-	"output",
-	"options",
-	"sticker",
-	"update",
-	"subscription",
-	"message",
-	"neighbor",
-	"mount",
-	nullptr
-};
-
 void
 idle_add(unsigned flags)
 {
 	assert(flags != 0);

-	unsigned old_flags = idle_flags.fetch_or(flags);
-
-	if ((old_flags & flags) != flags)
-		GlobalEvents::Emit(GlobalEvents::IDLE);
-}
-
-unsigned
-idle_get(void)
-{
-	return idle_flags.exchange(0);
-}
-
-const char*const*
-idle_get_names(void)
-{
-        return idle_names;
-}
-
-unsigned
-idle_parse_name(const char *name)
-{
-	assert(name != nullptr);
-
-	for (unsigned i = 0; idle_names[i] != nullptr; ++i)
-		if (StringEqualsCaseASCII(name, idle_names[i]))
-			return 1 << i;
-
-	return 0;
+	instance->EmitIdle(flags);
 }
--- a/src/Idle.hxx
+++ b/src/Idle.hxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * Copyright 2003-2017 The Music Player Daemon Project
 * http://www.musicpd.org
 *
 * This program is free software; you can redistribute it and/or modify
@@ -25,47 +25,7 @@
 #ifndef MPD_IDLE_HXX
 #define MPD_IDLE_HXX

-#include "Compiler.h"
-
-/** song database has been updated*/
-static constexpr unsigned IDLE_DATABASE = 0x1;
-
-/** a stored playlist has been modified, created, deleted or
-    renamed */
-static constexpr unsigned IDLE_STORED_PLAYLIST = 0x2;
-
-/** the current playlist has been modified */
-static constexpr unsigned IDLE_PLAYLIST = 0x4;
-
-/** the player state has changed: play, stop, pause, seek, ... */
-static constexpr unsigned IDLE_PLAYER = 0x8;
-
-/** the volume has been modified */
-static constexpr unsigned IDLE_MIXER = 0x10;
-
-/** an audio output device has been enabled or disabled */
-static constexpr unsigned IDLE_OUTPUT = 0x20;
-
-/** options have changed: crossfade; random; repeat; ... */
-static constexpr unsigned IDLE_OPTIONS = 0x40;
-
-/** a sticker has been modified. */
-static constexpr unsigned IDLE_STICKER = 0x80;
-
-/** a database update has started or finished. */
-static constexpr unsigned IDLE_UPDATE = 0x100;
-
-/** a client has subscribed or unsubscribed to/from a channel */
-static constexpr unsigned IDLE_SUBSCRIPTION = 0x200;
-
-/** a message on the subscribed channel was received */
-static constexpr unsigned IDLE_MESSAGE = 0x400;
-
-/** a neighbor was found or lost */
-static constexpr unsigned IDLE_NEIGHBOR = 0x800;
-
-/** the mount list has changed */
-static constexpr unsigned IDLE_MOUNT = 0x1000;
+#include "IdleFlags.hxx"

 /**
 * Adds idle flag (with bitwise "or") and queues notifications to all
@@ -74,24 +34,4 @@ static constexpr unsigned IDLE_MOUNT = 0x1000;
 void
 idle_add(unsigned flags);

-/**
- * Atomically reads and resets the global idle flags value.
- */
-unsigned
-idle_get(void);
-
-/**
- * Get idle names
- */
-const char*const*
-idle_get_names(void);
-
-/**
- * Parse an idle name and return its mask.  Returns 0 if the given
- * name is unknown.
- */
-gcc_nonnull_all gcc_pure
-unsigned
-idle_parse_name(const char *name);
-
 #endif
--- a/src/IdleFlags.cxx
+++ b/src/IdleFlags.cxx
@@ -0,0 +1,67 @@
+/*
+ * Copyright 2003-2017 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+/*
+ * Support library for the "idle" command.
+ *
+ */
+
+#include "config.h"
+#include "IdleFlags.hxx"
+#include "util/ASCII.hxx"
+
+#include <assert.h>
+
+static const char *const idle_names[] = {
+	"database",
+	"stored_playlist",
+	"playlist",
+	"player",
+	"mixer",
+	"output",
+	"options",
+	"sticker",
+	"update",
+	"subscription",
+	"message",
+	"neighbor",
+	"mount",
+	nullptr
+};
+
+const char*const*
+idle_get_names(void)
+{
+        return idle_names;
+}
+
+unsigned
+idle_parse_name(const char *name)
+{
+#if !CLANG_CHECK_VERSION(3,6)
+	/* disabled on clang due to -Wtautological-pointer-compare */
+	assert(name != nullptr);
+#endif
+
+	for (unsigned i = 0; idle_names[i] != nullptr; ++i)
+		if (StringEqualsCaseASCII(name, idle_names[i]))
+			return 1 << i;
+
+	return 0;
+}
--- a/src/IdleFlags.hxx
+++ b/src/IdleFlags.hxx
@@ -0,0 +1,84 @@
+/*
+ * Copyright 2003-2017 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+/*
+ * Support library for the "idle" command.
+ *
+ */
+
+#ifndef MPD_IDLE_FLAGS_HXX
+#define MPD_IDLE_FLAGS_HXX
+
+#include "Compiler.h"
+
+/** song database has been updated*/
+static constexpr unsigned IDLE_DATABASE = 0x1;
+
+/** a stored playlist has been modified, created, deleted or
+    renamed */
+static constexpr unsigned IDLE_STORED_PLAYLIST = 0x2;
+
+/** the current playlist has been modified */
+static constexpr unsigned IDLE_PLAYLIST = 0x4;
+
+/** the player state has changed: play, stop, pause, seek, ... */
+static constexpr unsigned IDLE_PLAYER = 0x8;
+
+/** the volume has been modified */
+static constexpr unsigned IDLE_MIXER = 0x10;
+
+/** an audio output device has been enabled or disabled */
+static constexpr unsigned IDLE_OUTPUT = 0x20;
+
+/** options have changed: crossfade; random; repeat; ... */
+static constexpr unsigned IDLE_OPTIONS = 0x40;
+
+/** a sticker has been modified. */
+static constexpr unsigned IDLE_STICKER = 0x80;
+
+/** a database update has started or finished. */
+static constexpr unsigned IDLE_UPDATE = 0x100;
+
+/** a client has subscribed or unsubscribed to/from a channel */
+static constexpr unsigned IDLE_SUBSCRIPTION = 0x200;
+
+/** a message on the subscribed channel was received */
+static constexpr unsigned IDLE_MESSAGE = 0x400;
+
+/** a neighbor was found or lost */
+static constexpr unsigned IDLE_NEIGHBOR = 0x800;
+
+/** the mount list has changed */
+static constexpr unsigned IDLE_MOUNT = 0x1000;
+
+/**
+ * Get idle names
+ */
+const char*const*
+idle_get_names();
+
+/**
+ * Parse an idle name and return its mask.  Returns 0 if the given
+ * name is unknown.
+ */
+gcc_nonnull_all gcc_pure
+unsigned
+idle_parse_name(const char *name);
+
+#endif
--- a/src/Instance.cxx
+++ b/src/Instance.cxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * Copyright 2003-2017 The Music Player Daemon Project
 * http://www.musicpd.org
 *
 * This program is free software; you can redistribute it and/or modify
@@ -25,37 +25,27 @@

 #ifdef ENABLE_DATABASE
 #include "db/DatabaseError.hxx"
-#include "db/LightSong.hxx"

 #ifdef ENABLE_SQLITE
 #include "sticker/StickerDatabase.hxx"
 #include "sticker/SongSticker.hxx"
 #endif
-
-Database *
-Instance::GetDatabase(Error &error)
-{
-	if (database == nullptr)
-		error.Set(db_domain, DB_DISABLED, "No database");
-	return database;
-}
-
 #endif

-void
-Instance::TagModified()
-{
-	partition->TagModified();
-}
-
-void
-Instance::SyncWithPlayer()
-{
-	partition->SyncWithPlayer();
-}
+#include <stdexcept>

 #ifdef ENABLE_DATABASE

+const Database &
+Instance::GetDatabaseOrThrow() const
+{
+	if (database == nullptr)
+		throw DatabaseError(DatabaseErrorCode::DISABLED,
+				    "No database");
+
+	return *database;
+}
+
 void
 Instance::OnDatabaseModified()
 {
@@ -65,22 +55,24 @@ Instance::OnDatabaseModified()

 	stats_invalidate();
 	partition->DatabaseModified(*database);
-	idle_add(IDLE_DATABASE);
 }

 void
-Instance::OnDatabaseSongRemoved(const LightSong &song)
+Instance::OnDatabaseSongRemoved(const char *uri)
 {
 	assert(database != nullptr);

 #ifdef ENABLE_SQLITE
 	/* if the song has a sticker, remove it */
-	if (sticker_enabled())
-		sticker_song_delete(song);
+	if (sticker_enabled()) {
+		try {
+			sticker_song_delete(uri);
+		} catch (const std::runtime_error &) {
+		}
+	}
 #endif

-	const auto uri = song.GetURI();
-	partition->DeleteSong(uri.c_str());
+	partition->StaleSong(uri);
 }

 #endif
@@ -90,13 +82,13 @@ Instance::OnDatabaseSongRemoved(const LightSong &song)
 void
 Instance::FoundNeighbor(gcc_unused const NeighborInfo &info)
 {
-	idle_add(IDLE_NEIGHBOR);
+	partition->EmitIdle(IDLE_NEIGHBOR);
 }

 void
 Instance::LostNeighbor(gcc_unused const NeighborInfo &info)
 {
-	idle_add(IDLE_NEIGHBOR);
+	partition->EmitIdle(IDLE_NEIGHBOR);
 }

 #endif
--- a/src/Instance.hxx
+++ b/src/Instance.hxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * Copyright 2003-2017 The Music Player Daemon Project
 * http://www.musicpd.org
 *
 * This program is free software; you can redistribute it and/or modify
@@ -21,6 +21,8 @@
 #define MPD_INSTANCE_HXX

 #include "check.h"
+#include "event/Loop.hxx"
+#include "event/MaskMonitor.hxx"
 #include "Compiler.h"

 #ifdef ENABLE_NEIGHBOR_PLUGINS
@@ -35,14 +37,22 @@ class Storage;
 class UpdateService;
 #endif

-class EventLoop;
-class Error;
 class ClientList;
 struct Partition;
+class StateFile;
+
+/**
+ * A utility class which, when used as the first base class, ensures
+ * that the #EventLoop gets initialized before the other base classes.
+ */
+struct EventLoopHolder {
+	EventLoop event_loop;
+};

 struct Instance final
+	: EventLoopHolder
 #if defined(ENABLE_DATABASE) || defined(ENABLE_NEIGHBOR_PLUGINS)
-	:
+	,
 #endif
 #ifdef ENABLE_DATABASE
 	public DatabaseListener
@@ -54,7 +64,7 @@ struct Instance final
 	public NeighborListener
 #endif
 {
-	EventLoop *event_loop;
+	MaskMonitor idle_monitor;

 #ifdef ENABLE_NEIGHBOR_PLUGINS
 	NeighborGlue *neighbors;
@@ -67,20 +77,29 @@ struct Instance final
 	 * This is really a #CompositeStorage.  To avoid heavy include
 	 * dependencies, we declare it as just #Storage.
 	 */
-	Storage *storage;
+	Storage *storage = nullptr;

-	UpdateService *update;
+	UpdateService *update = nullptr;
 #endif

 	ClientList *client_list;

 	Partition *partition;

-	Instance() {
-#ifdef ENABLE_DATABASE
-		storage = nullptr;
-		update = nullptr;
-#endif
+	StateFile *state_file;
+
+	Instance()
+		:idle_monitor(event_loop, BIND_THIS_METHOD(OnIdle)), state_file(nullptr) {}
+
+	/**
+	 * Initiate shutdown.  Wrapper for EventLoop::Break().
+	 */
+	void Shutdown() {
+		event_loop.Break();
+	}
+
+	void EmitIdle(unsigned mask) {
+		idle_monitor.OrMask(mask);
 	}

 #ifdef ENABLE_DATABASE
@@ -89,31 +108,33 @@ struct Instance final
 	 * if this MPD configuration has no database (no
 	 * music_directory was configured).
 	 */
-	Database *GetDatabase(Error &error);
+	Database *GetDatabase() {
+		return database;
+	}
+
+	/**
+	 * Returns the global #Database instance.  Throws
+	 * DatabaseError if this MPD configuration has no database (no
+	 * music_directory was configured).
+	 */
+	gcc_pure
+	const Database &GetDatabaseOrThrow() const;
 #endif

-	/**
-	 * A tag in the play queue has been modified by the player
-	 * thread.  Propagate the change to all subsystems.
-	 */
-	void TagModified();
-
-	/**
-	 * Synchronize the player with the play queue.
-	 */
-	void SyncWithPlayer();
-
 private:
 #ifdef ENABLE_DATABASE
-	virtual void OnDatabaseModified() override;
-	virtual void OnDatabaseSongRemoved(const LightSong &song) override;
+	void OnDatabaseModified() override;
+	void OnDatabaseSongRemoved(const char *uri) override;
 #endif

 #ifdef ENABLE_NEIGHBOR_PLUGINS
 	/* virtual methods from class NeighborListener */
-	virtual void FoundNeighbor(const NeighborInfo &info) override;
-	virtual void LostNeighbor(const NeighborInfo &info) override;
+	void FoundNeighbor(const NeighborInfo &info) override;
+	void LostNeighbor(const NeighborInfo &info) override;
 #endif
+
+	/* callback for #idle_monitor */
+	void OnIdle(unsigned mask);
 };

 #endif
--- a/src/Listen.cxx
+++ b/src/Listen.cxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * Copyright 2003-2017 The Music Player Daemon Project
 * http://www.musicpd.org
 *
 * This program is free software; you can redistribute it and/or modify
@@ -20,11 +20,13 @@
 #include "config.h"
 #include "Listen.hxx"
 #include "client/Client.hxx"
-#include "config/ConfigData.hxx"
+#include "config/Param.hxx"
 #include "config/ConfigGlobal.hxx"
 #include "config/ConfigOption.hxx"
+#include "net/SocketAddress.hxx"
 #include "event/ServerSocket.hxx"
-#include "util/Error.hxx"
+#include "system/Error.hxx"
+#include "util/RuntimeError.hxx"
 #include "util/Domain.hxx"
 #include "fs/AllocatedPath.hxx"
 #include "Log.hxx"
@@ -48,73 +50,65 @@ public:
 		:ServerSocket(_loop), partition(_partition) {}

 private:
-	virtual void OnAccept(int fd, const sockaddr &address,
-			      size_t address_length, int uid) {
+	void OnAccept(int fd, SocketAddress address, int uid) override {
 		client_new(GetEventLoop(), partition,
-			   fd, &address, address_length, uid);
+			   fd, address, uid);
 	}
 };

 static ClientListener *listen_socket;
 int listen_port;

-static bool
+/**
+ * Throws #std::runtime_error on error.
+ */
+static void
 listen_add_config_param(unsigned int port,
-			const struct config_param *param,
-			Error &error_r)
+			const ConfigParam *param)
 {
 	assert(param != nullptr);

 	if (0 == strcmp(param->value.c_str(), "any")) {
-		return listen_socket->AddPort(port, error_r);
+		listen_socket->AddPort(port);
 	} else if (param->value[0] == '/' || param->value[0] == '~') {
-		auto path = config_parse_path(param, error_r);
-		return !path.IsNull() &&
-			listen_socket->AddPath(std::move(path), error_r);
+		listen_socket->AddPath(param->GetPath());
 	} else {
-		return listen_socket->AddHost(param->value.c_str(), port,
-					      error_r);
+		listen_socket->AddHost(param->value.c_str(), port);
 	}
 }

 #ifdef ENABLE_SYSTEMD_DAEMON

 static bool
-listen_systemd_activation(Error &error_r)
+listen_systemd_activation()
 {
 	int n = sd_listen_fds(true);
 	if (n <= 0) {
 		if (n < 0)
-			FormatErrno(listen_domain, -n,
-				    "sd_listen_fds() failed");
+			throw MakeErrno(-n, "sd_listen_fds() failed");
 		return false;
 	}

 	for (int i = SD_LISTEN_FDS_START, end = SD_LISTEN_FDS_START + n;
 	     i != end; ++i)
-		if (!listen_socket->AddFD(i, error_r))
-			return false;
+		listen_socket->AddFD(i);

 	return true;
 }

 #endif

-bool
-listen_global_init(EventLoop &loop, Partition &partition, Error &error)
+void
+listen_global_init(EventLoop &loop, Partition &partition)
 {
-	int port = config_get_positive(CONF_PORT, DEFAULT_PORT);
-	const struct config_param *param =
-		config_get_param(CONF_BIND_TO_ADDRESS);
+	int port = config_get_positive(ConfigOption::PORT, DEFAULT_PORT);
+	const auto *param = config_get_param(ConfigOption::BIND_TO_ADDRESS);

 	listen_socket = new ClientListener(loop, partition);

 #ifdef ENABLE_SYSTEMD_DAEMON
-	if (listen_systemd_activation(error))
-		return true;
-
-	if (error.IsDefined())
-		return false;
+	if (listen_systemd_activation())
+		return;
 #endif

 	if (param != nullptr) {
@@ -122,32 +116,35 @@ listen_global_init(EventLoop &loop, Partition &partition, Error &error)
 		   for all values */

 		do {
-			if (!listen_add_config_param(port, param, error)) {
+			try {
+				listen_add_config_param(port, param);
+			} catch (const std::runtime_error &e) {
 				delete listen_socket;
-				error.FormatPrefix("Failed to listen on %s (line %i): ",
-						   param->value.c_str(),
-						   param->line);
-				return false;
+				std::throw_with_nested(FormatRuntimeError("Failed to listen on %s (line %i)",
+									  param->value.c_str(),
+									  param->line));
 			}
 		} while ((param = param->next) != nullptr);
 	} else {
 		/* no "bind_to_address" configured, bind the
 		   configured port on all interfaces */

-		if (!listen_socket->AddPort(port, error)) {
+		try {
+			listen_socket->AddPort(port);
+		} catch (const std::runtime_error &e) {
 			delete listen_socket;
-			error.FormatPrefix("Failed to listen on *:%d: ", port);
-			return false;
+			std::throw_with_nested(FormatRuntimeError("Failed to listen on *:%d: ", port));
 		}
 	}

-	if (!listen_socket->Open(error)) {
+	try {
+		listen_socket->Open();
+	} catch (const std::runtime_error &e) {
 		delete listen_socket;
-		return false;
+		throw;
 	}

 	listen_port = port;
-	return true;
 }

 void listen_global_finish(void)
--- a/src/Listen.hxx
+++ b/src/Listen.hxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * Copyright 2003-2017 The Music Player Daemon Project
 * http://www.musicpd.org
 *
 * This program is free software; you can redistribute it and/or modify
@@ -21,14 +21,14 @@
 #define MPD_LISTEN_HXX

 class EventLoop;
-class Error;
 struct Partition;

 extern int listen_port;

-bool
-listen_global_init(EventLoop &loop, Partition &partition, Error &error);
+void
+listen_global_init(EventLoop &loop, Partition &partition);

-void listen_global_finish(void);
+void
+listen_global_finish();

 #endif
--- a/src/LocateUri.cxx
+++ b/src/LocateUri.cxx
@@ -0,0 +1,110 @@
+/*
+ * Copyright 2003-2017 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "config.h"
+#include "LocateUri.hxx"
+#include "client/Client.hxx"
+#include "fs/AllocatedPath.hxx"
+#include "ls.hxx"
+#include "util/UriUtil.hxx"
+#include "util/StringCompare.hxx"
+
+#ifdef ENABLE_DATABASE
+#include "storage/StorageInterface.hxx"
+#endif
+
+static LocatedUri
+LocateFileUri(const char *uri, const Client *client
+#ifdef ENABLE_DATABASE
+	      , const Storage *storage
+#endif
+	      )
+{
+	auto path = AllocatedPath::FromUTF8Throw(uri);
+
+#ifdef ENABLE_DATABASE
+	if (storage != nullptr) {
+		const char *suffix = storage->MapToRelativeUTF8(uri);
+		if (suffix != nullptr)
+			/* this path was relative to the music
+			   directory */
+			return LocatedUri(LocatedUri::Type::RELATIVE, suffix);
+	}
+#endif
+
+	if (client != nullptr)
+		client->AllowFile(path);
+
+	return LocatedUri(LocatedUri::Type::PATH, uri, std::move(path));
+}
+
+static LocatedUri
+LocateAbsoluteUri(const char *uri
+#ifdef ENABLE_DATABASE
+		  , const Storage *storage
+#endif
+		  )
+{
+	if (!uri_supported_scheme(uri))
+		throw std::runtime_error("Unsupported URI scheme");
+
+#ifdef ENABLE_DATABASE
+	if (storage != nullptr) {
+		const char *suffix = storage->MapToRelativeUTF8(uri);
+		if (suffix != nullptr)
+			return LocatedUri(LocatedUri::Type::RELATIVE, suffix);
+	}
+#endif
+
+	return LocatedUri(LocatedUri::Type::ABSOLUTE, uri);
+}
+
+LocatedUri
+LocateUri(const char *uri, const Client *client
+#ifdef ENABLE_DATABASE
+	  , const Storage *storage
+#endif
+	  )
+{
+	/* skip the obsolete "file://" prefix */
+	const char *path_utf8 = StringAfterPrefix(uri, "file://");
+	if (path_utf8 != nullptr) {
+		if (!PathTraitsUTF8::IsAbsolute(path_utf8))
+			throw std::runtime_error("Malformed file:// URI");
+
+		return LocateFileUri(path_utf8, client
+#ifdef ENABLE_DATABASE
+				     , storage
+#endif
+				     );
+	} else if (PathTraitsUTF8::IsAbsolute(uri))
+		return LocateFileUri(uri, client
+#ifdef ENABLE_DATABASE
+				     , storage
+#endif
+				     );
+	else if (uri_has_scheme(uri))
+		return LocateAbsoluteUri(uri
+#ifdef ENABLE_DATABASE
+					 , storage
+#endif
+					 );
+	else
+		return LocatedUri(LocatedUri::Type::RELATIVE, uri);
+}
--- a/src/LocateUri.hxx
+++ b/src/LocateUri.hxx
@@ -0,0 +1,93 @@
+/*
+ * Copyright 2003-2017 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef MPD_LOCATE_URI_HXX
+#define MPD_LOCATE_URI_HXX
+
+#include "check.h"
+#include "Compiler.h"
+#include "fs/AllocatedPath.hxx"
+
+#ifdef WIN32
+#include <windows.h>
+/* damn you, windows.h! */
+#ifdef ABSOLUTE
+#undef ABSOLUTE
+#endif
+#ifdef RELATIVE
+#undef RELATIVE
+#endif
+#endif
+
+class Client;
+
+#ifdef ENABLE_DATABASE
+class Storage;
+#endif
+
+struct LocatedUri {
+	enum class Type {
+		/**
+		 * An absolute URI with a supported scheme.
+		 */
+		ABSOLUTE,
+
+		/**
+		 * A relative URI path.
+		 */
+		RELATIVE,
+
+		/**
+		 * A local file.  The #path attribute is valid.
+		 */
+		PATH,
+	} type;
+
+	const char *canonical_uri;
+
+	/**
+	 * Contains the local file path if type==FILE.
+	 */
+	AllocatedPath path;
+
+	LocatedUri(Type _type, const char *_uri,
+		   AllocatedPath &&_path=AllocatedPath::Null())
+		:type(_type), canonical_uri(_uri), path(std::move(_path)) {}
+};
+
+/**
+ * Classify a URI.
+ *
+ * Throws #std::runtime_error on error.
+ *
+ * @param client the #Client that is used to determine whether a local
+ * file is allowed; nullptr disables the check and allows all local
+ * files
+ * @param storage a #Storage instance which may be used to convert
+ * absolute URIs to relative ones, using Storage::MapToRelativeUTF8();
+ * that feature is disabled if this parameter is nullptr
+ */
+LocatedUri
+LocateUri(const char *uri, const Client *client
+#ifdef ENABLE_DATABASE
+	  , const Storage *storage
+#endif
+	  );
+
+#endif
--- a/src/Log.cxx
+++ b/src/Log.cxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * Copyright 2003-2017 The Music Player Daemon Project
 * http://www.musicpd.org
 *
 * This program is free software; you can redistribute it and/or modify
@@ -19,13 +19,16 @@

 #include "config.h"
 #include "LogV.hxx"
-#include "util/Error.hxx"
+#include "util/Domain.hxx"
+
+#include <exception>

-#include <assert.h>
 #include <stdio.h>
 #include <string.h>
 #include <errno.h>

+static constexpr Domain exception_domain("exception");
+
 void
 LogFormatV(const Domain &domain, LogLevel level, const char *fmt, va_list ap)
 {
@@ -89,20 +92,37 @@ FormatError(const Domain &domain, const char *fmt, ...)
 }

 void
-LogError(const Error &error)
+LogError(const std::exception &e)
 {
-	Log(error.GetDomain(), LogLevel::ERROR, error.GetMessage());
+	Log(exception_domain, LogLevel::ERROR, e.what());
+
+	try {
+		std::rethrow_if_nested(e);
+	} catch (const std::exception &nested) {
+		LogError(nested, "nested");
+	} catch (...) {
+		Log(exception_domain, LogLevel::ERROR,
+		    "Unrecognized nested exception");
+	}
 }

 void
-LogError(const Error &error, const char *msg)
+LogError(const std::exception &e, const char *msg)
 {
-	LogFormat(error.GetDomain(), LogLevel::ERROR, "%s: %s",
-		  msg, error.GetMessage());
+	FormatError(exception_domain, "%s: %s", msg, e.what());
+
+	try {
+		std::rethrow_if_nested(e);
+	} catch (const std::exception &nested) {
+		LogError(nested);
+	} catch (...) {
+		Log(exception_domain, LogLevel::ERROR,
+		    "Unrecognized nested exception");
+	}
 }

 void
-FormatError(const Error &error, const char *fmt, ...)
+FormatError(const std::exception &e, const char *fmt, ...)
 {
 	char msg[1024];
 	va_list ap;
@@ -110,7 +130,45 @@ FormatError(const Error &error, const char *fmt, ...)
 	vsnprintf(msg, sizeof(msg), fmt, ap);
 	va_end(ap);

-	LogError(error, msg);
+	LogError(e, msg);
+}
+
+void
+LogError(const std::exception_ptr &ep)
+{
+	try {
+		std::rethrow_exception(ep);
+	} catch (const std::exception &e) {
+		LogError(e);
+	} catch (...) {
+		Log(exception_domain, LogLevel::ERROR,
+		    "Unrecognized exception");
+	}
+}
+
+void
+LogError(const std::exception_ptr &ep, const char *msg)
+{
+	try {
+		std::rethrow_exception(ep);
+	} catch (const std::exception &e) {
+		LogError(e, msg);
+	} catch (...) {
+		FormatError(exception_domain,
+			    "%s: Unrecognized exception", msg);
+	}
+}
+
+void
+FormatError(const std::exception_ptr &ep, const char *fmt, ...)
+{
+	char msg[1024];
+	va_list ap;
+	va_start(ap, fmt);
+	vsnprintf(msg, sizeof(msg), fmt, ap);
+	va_end(ap);
+
+	LogError(ep, msg);
 }

 void
--- a/src/Log.hxx
+++ b/src/Log.hxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * Copyright 2003-2017 The Music Player Daemon Project
 * http://www.musicpd.org
 *
 * This program is free software; you can redistribute it and/or modify
@@ -23,7 +23,8 @@
 #include "LogLevel.hxx"
 #include "Compiler.h"

-class Error;
+#include <exception>
+
 class Domain;

 void
@@ -79,20 +80,30 @@ LogError(const Domain &domain, const char *msg)
 	Log(domain, LogLevel::ERROR, msg);
 }

+void
+LogError(const std::exception &e);
+
+void
+LogError(const std::exception &e, const char *msg);
+
+gcc_printf(2,3)
+void
+FormatError(const std::exception &e, const char *fmt, ...);
+
+void
+LogError(const std::exception_ptr &ep);
+
+void
+LogError(const std::exception_ptr &ep, const char *msg);
+
+gcc_printf(2,3)
+void
+FormatError(const std::exception_ptr &ep, const char *fmt, ...);
+
 gcc_printf(2,3)
 void
 FormatError(const Domain &domain, const char *fmt, ...);

-void
-LogError(const Error &error);
-
-void
-LogError(const Error &error, const char *msg);
-
-gcc_printf(2,3)
-void
-FormatError(const Error &error, const char *fmt, ...);
-
 void
 LogErrno(const Domain &domain, int e, const char *msg);

--- a/src/LogBackend.cxx
+++ b/src/LogBackend.cxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * Copyright 2003-2017 The Music Player Daemon Project
 * http://www.musicpd.org
 *
 * This program is free software; you can redistribute it and/or modify
@@ -23,10 +23,6 @@
 #include "util/Domain.hxx"
 #include "util/StringUtil.hxx"

-#ifdef HAVE_GLIB
-#include <glib.h>
-#endif
-
 #include <assert.h>
 #include <stdio.h>
 #include <string.h>
@@ -65,10 +61,6 @@ ToAndroidLogLevel(LogLevel log_level)

 static LogLevel log_threshold = LogLevel::INFO;

-#ifdef HAVE_GLIB
-static const char *log_charset;
-#endif
-
 static bool enable_timestamp;

 #ifdef HAVE_SYSLOG
@@ -81,16 +73,6 @@ SetLogThreshold(LogLevel _threshold)
 	log_threshold = _threshold;
 }

-#ifdef HAVE_GLIB
-
-void
-SetLogCharset(const char *_charset)
-{
-	log_charset = _charset;
-}
-
-#endif
-
 void
 EnableLogTimestamp()
 {
@@ -175,27 +157,15 @@ LogFinishSysLog()
 static void
 FileLog(const Domain &domain, const char *message)
 {
-#ifdef HAVE_GLIB
-	char *converted;
-
-	if (log_charset != nullptr) {
-		converted = g_convert_with_fallback(message, -1,
-						    log_charset, "utf-8",
-						    nullptr, nullptr,
-						    nullptr, nullptr);
-		if (converted != nullptr)
-			message = converted;
-	} else
-		converted = nullptr;
-#endif
-
 	fprintf(stderr, "%s%s: %.*s\n",
 		enable_timestamp ? log_date() : "",
 		domain.GetName(),
 		chomp_length(message), message);

-#ifdef HAVE_GLIB
-	g_free(converted);
+#ifdef WIN32
+	/* force-flush the log file, because setvbuf() does not seem
+	   to have an effect on WIN32 */
+	fflush(stderr);
 #endif
 }

--- a/src/LogBackend.hxx
+++ b/src/LogBackend.hxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * Copyright 2003-2017 The Music Player Daemon Project
 * http://www.musicpd.org
 *
 * This program is free software; you can redistribute it and/or modify
@@ -26,13 +26,6 @@
 void
 SetLogThreshold(LogLevel _threshold);

-#ifdef HAVE_GLIB
-
-void
-SetLogCharset(const char *_charset);
-
-#endif
-
 void
 EnableLogTimestamp();

--- a/src/LogInit.cxx
+++ b/src/LogInit.cxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * Copyright 2003-2017 The Music Player Daemon Project
 * http://www.musicpd.org
 *
 * This program is free software; you can redistribute it and/or modify
@@ -21,25 +21,19 @@
 #include "LogInit.hxx"
 #include "LogBackend.hxx"
 #include "Log.hxx"
-#include "config/ConfigData.hxx"
+#include "config/Param.hxx"
 #include "config/ConfigGlobal.hxx"
 #include "config/ConfigOption.hxx"
-#include "system/FatalError.hxx"
 #include "fs/AllocatedPath.hxx"
 #include "fs/FileSystem.hxx"
-#include "util/Error.hxx"
 #include "util/Domain.hxx"
-#include "system/FatalError.hxx"
-
-#ifdef HAVE_GLIB
-#include <glib.h>
-#endif
+#include "util/RuntimeError.hxx"
+#include "system/Error.hxx"

 #include <assert.h>
 #include <string.h>
 #include <fcntl.h>
 #include <stdio.h>
-#include <time.h>
 #include <unistd.h>

 #define LOG_LEVEL_SECURE LogLevel::INFO
@@ -51,16 +45,16 @@ static constexpr Domain log_domain("log");

 #ifndef ANDROID

-static int out_fd;
+static int out_fd = -1;
 static AllocatedPath out_path = AllocatedPath::Null();

 static void redirect_logs(int fd)
 {
 	assert(fd >= 0);
 	if (dup2(fd, STDOUT_FILENO) < 0)
-		FatalSystemError("Failed to dup2 stdout");
+		throw MakeErrno("Failed to dup2 stdout");
 	if (dup2(fd, STDERR_FILENO) < 0)
-		FatalSystemError("Failed to dup2 stderr");
+		throw MakeErrno("Failed to dup2 stderr");
 }

 static int
@@ -71,25 +65,30 @@ open_log_file(void)
 	return OpenFile(out_path, O_CREAT | O_WRONLY | O_APPEND, 0666);
 }

-static bool
-log_init_file(unsigned line, Error &error)
+static void
+log_init_file(int line)
 {
 	assert(!out_path.IsNull());

 	out_fd = open_log_file();
 	if (out_fd < 0) {
+#ifdef WIN32
 		const std::string out_path_utf8 = out_path.ToUTF8();
-		error.FormatErrno("failed to open log file \"%s\" (config line %u)",
+		throw FormatRuntimeError("failed to open log file \"%s\" (config line %d)",
+					 out_path_utf8.c_str(), line);
+#else
+		int e = errno;
+		const std::string out_path_utf8 = out_path.ToUTF8();
+		throw FormatErrno(e, "failed to open log file \"%s\" (config line %d)",
 				  out_path_utf8.c_str(), line);
-		return false;
+#endif
 	}

 	EnableLogTimestamp();
-	return true;
 }

 static inline LogLevel
-parse_log_level(const char *value, unsigned line)
+parse_log_level(const char *value, int line)
 {
 	if (0 == strcmp(value, "default"))
 		return LogLevel::DEFAULT;
@@ -97,10 +96,9 @@ parse_log_level(const char *value, unsigned line)
 		return LOG_LEVEL_SECURE;
 	else if (0 == strcmp(value, "verbose"))
 		return LogLevel::DEBUG;
-	else {
-		FormatFatalError("unknown log level \"%s\" at line %u",
-				 value, line);
-	}
+	else
+		throw FormatRuntimeError("unknown log level \"%s\" at line %d",
+					 value, line);
 }

 #endif
@@ -111,59 +109,44 @@ log_early_init(bool verbose)
 #ifdef ANDROID
 	(void)verbose;
 #else
+	/* force stderr to be line-buffered */
+	setvbuf(stderr, nullptr, _IOLBF, 0);
+
 	if (verbose)
 		SetLogThreshold(LogLevel::DEBUG);
 #endif
 }

-bool
-log_init(bool verbose, bool use_stdout, Error &error)
+void
+log_init(bool verbose, bool use_stdout)
 {
 #ifdef ANDROID
 	(void)verbose;
 	(void)use_stdout;
-	(void)error;
-
-	return true;
 #else
-	const struct config_param *param;
-
-#ifdef HAVE_GLIB
-	const char *charset;
-	g_get_charset(&charset);
-	SetLogCharset(charset);
-#endif
-
 	if (verbose)
 		SetLogThreshold(LogLevel::DEBUG);
-	else if ((param = config_get_param(CONF_LOG_LEVEL)) != nullptr)
+	else if (const auto &param = config_get_param(ConfigOption::LOG_LEVEL))
 		SetLogThreshold(parse_log_level(param->value.c_str(),
 						param->line));

 	if (use_stdout) {
-		return true;
+		out_fd = STDOUT_FILENO;
 	} else {
-		param = config_get_param(CONF_LOG_FILE);
+		const auto *param = config_get_param(ConfigOption::LOG_FILE);
 		if (param == nullptr) {
-#ifdef HAVE_SYSLOG
 			/* no configuration: default to syslog (if
 			   available) */
-			LogInitSysLog();
-			return true;
-#else
-			error.Set(log_domain,
-				  "config parameter 'log_file' not found");
-			return false;
+#ifndef HAVE_SYSLOG
+			throw std::runtime_error("config parameter 'log_file' not found");
 #endif
 #ifdef HAVE_SYSLOG
 		} else if (strcmp(param->value.c_str(), "syslog") == 0) {
 			LogInitSysLog();
-			return true;
 #endif
 		} else {
-			out_path = config_get_path(CONF_LOG_FILE, error);
-			return !out_path.IsNull() &&
-				log_init_file(param->line, error);
+			out_path = param->GetPath();
+			log_init_file(param->line);
 		}
 	}
 #endif
@@ -190,12 +173,10 @@ log_deinit(void)
 #endif
 }

-void setup_log_output(bool use_stdout)
+void setup_log_output()
 {
-#ifdef ANDROID
-	(void)use_stdout;
-#else
-	if (use_stdout)
+#ifndef ANDROID
+	if (out_fd == STDOUT_FILENO)
 		return;

 	fflush(nullptr);
@@ -213,10 +194,6 @@ void setup_log_output(bool use_stdout)
 	redirect_logs(out_fd);
 	close(out_fd);
 	out_fd = -1;
-
-#ifdef HAVE_GLIB
-	SetLogCharset(nullptr);
-#endif
 #endif
 }

--- a/src/LogInit.hxx
+++ b/src/LogInit.hxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * Copyright 2003-2017 The Music Player Daemon Project
 * http://www.musicpd.org
 *
 * This program is free software; you can redistribute it and/or modify
@@ -20,8 +20,6 @@
 #ifndef MPD_LOG_INIT_HXX
 #define MPD_LOG_INIT_HXX

-class Error;
-
 /**
 * Configure a logging destination for daemon startup, before the
 * configuration file is read.  This allows the daemon to use the
@@ -33,14 +31,19 @@ class Error;
 void
 log_early_init(bool verbose);

-bool
-log_init(bool verbose, bool use_stdout, Error &error);
+/**
+ * Throws #std::runtime_error on error.
+ */
+void
+log_init(bool verbose, bool use_stdout);

 void
-log_deinit(void);
+log_deinit();

-void setup_log_output(bool use_stdout);
+void
+setup_log_output();

-int cycle_log_files(void);
+int
+cycle_log_files();

 #endif /* LOG_H */
--- a/src/LogLevel.hxx
+++ b/src/LogLevel.hxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * Copyright 2003-2017 The Music Player Daemon Project
 * http://www.musicpd.org
 *
 * This program is free software; you can redistribute it and/or modify
--- a/src/LogV.hxx
+++ b/src/LogV.hxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * Copyright 2003-2017 The Music Player Daemon Project
 * http://www.musicpd.org
 *
 * This program is free software; you can redistribute it and/or modify
--- a/src/Main.cxx
+++ b/src/Main.cxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * Copyright 2003-2017 The Music Player Daemon Project
 * http://www.musicpd.org
 *
 * This program is free software; you can redistribute it and/or modify
@@ -22,10 +22,9 @@
 #include "Instance.hxx"
 #include "CommandLine.hxx"
 #include "PlaylistFile.hxx"
-#include "PlaylistGlobal.hxx"
 #include "MusicChunk.hxx"
 #include "StateFile.hxx"
-#include "PlayerThread.hxx"
+#include "player/Thread.hxx"
 #include "Mapper.hxx"
 #include "Permission.hxx"
 #include "Listen.hxx"
@@ -34,11 +33,10 @@
 #include "command/AllCommands.hxx"
 #include "Partition.hxx"
 #include "tag/TagConfig.hxx"
-#include "ReplayGainConfig.hxx"
+#include "ReplayGainGlobal.hxx"
 #include "Idle.hxx"
 #include "Log.hxx"
 #include "LogInit.hxx"
-#include "GlobalEvents.hxx"
 #include "input/Init.hxx"
 #include "event/Loop.hxx"
 #include "IOThread.hxx"
@@ -47,23 +45,22 @@
 #include "playlist/PlaylistRegistry.hxx"
 #include "zeroconf/ZeroconfGlue.hxx"
 #include "decoder/DecoderList.hxx"
-#include "AudioConfig.hxx"
+#include "AudioParser.hxx"
 #include "pcm/PcmConvert.hxx"
 #include "unix/SignalHandlers.hxx"
-#include "unix/Daemon.hxx"
 #include "system/FatalError.hxx"
-#include "util/UriUtil.hxx"
-#include "util/Error.hxx"
-#include "util/Domain.hxx"
-#include "thread/Id.hxx"
 #include "thread/Slack.hxx"
 #include "lib/icu/Init.hxx"
 #include "config/ConfigGlobal.hxx"
-#include "config/ConfigData.hxx"
+#include "config/Param.hxx"
 #include "config/ConfigDefaults.hxx"
 #include "config/ConfigOption.hxx"
 #include "config/ConfigError.hxx"
-#include "Stats.hxx"
+#include "util/RuntimeError.hxx"
+
+#ifdef ENABLE_DAEMON
+#include "unix/Daemon.hxx"
+#endif

 #ifdef ENABLE_DATABASE
 #include "db/update/Service.hxx"
@@ -99,8 +96,8 @@
 #include "org_musicpd_Bridge.h"
 #endif

-#ifdef HAVE_GLIB
-#include <glib.h>
+#ifdef ENABLE_SYSTEMD_DAEMON
+#include <systemd/sd-daemon.h>
 #endif

 #include <stdlib.h>
@@ -123,63 +120,56 @@
 static constexpr unsigned DEFAULT_BUFFER_SIZE = 4096;
 static constexpr unsigned DEFAULT_BUFFER_BEFORE_PLAY = 10;

-static constexpr Domain main_domain("main");
-
 #ifdef ANDROID
 Context *context;
 #endif

 Instance *instance;

-static StateFile *state_file;
+struct Config {
+	ReplayGainConfig replay_gain;
+};

-#ifndef ANDROID
-
-static bool
-glue_daemonize_init(const struct options *options, Error &error)
+gcc_const
+static Config
+LoadConfig()
 {
-	auto pid_file = config_get_path(CONF_PID_FILE, error);
-	if (pid_file.IsNull() && error.IsDefined())
-		return false;
+	return {LoadReplayGainConfig()};
+}

-	daemonize_init(config_get_string(CONF_USER, nullptr),
-		       config_get_string(CONF_GROUP, nullptr),
-		       std::move(pid_file));
+#ifdef ENABLE_DAEMON
+
+static void
+glue_daemonize_init(const struct options *options)
+{
+	daemonize_init(config_get_string(ConfigOption::USER, nullptr),
+		       config_get_string(ConfigOption::GROUP, nullptr),
+		       config_get_path(ConfigOption::PID_FILE));

 	if (options->kill)
 		daemonize_kill();
-
-	return true;
 }

 #endif

-static bool
-glue_mapper_init(Error &error)
+static void
+glue_mapper_init()
 {
-	auto playlist_dir = config_get_path(CONF_PLAYLIST_DIR, error);
-	if (playlist_dir.IsNull() && error.IsDefined())
-		return false;
-
-	mapper_init(std::move(playlist_dir));
-	return true;
+	mapper_init(config_get_path(ConfigOption::PLAYLIST_DIR));
 }

 #ifdef ENABLE_DATABASE

-static bool
-InitStorage(Error &error)
+static void
+InitStorage()
 {
-	Storage *storage = CreateConfiguredStorage(io_thread_get(), error);
+	Storage *storage = CreateConfiguredStorage(io_thread_get());
 	if (storage == nullptr)
-		return !error.IsDefined();
-
-	assert(!error.IsDefined());
+		return;

 	CompositeStorage *composite = new CompositeStorage();
 	instance->storage = composite;
 	composite->Mount("", storage);
-	return true;
 }

 /**
@@ -190,20 +180,13 @@ InitStorage(Error &error)
 static bool
 glue_db_init_and_load(void)
 {
-	Error error;
 	instance->database =
-		CreateConfiguredDatabase(*instance->event_loop, *instance,
-					 error);
-	if (instance->database == nullptr) {
-		if (error.IsDefined())
-			FatalError(error);
-		else
-			return true;
-	}
+		CreateConfiguredDatabase(instance->event_loop, *instance);
+	if (instance->database == nullptr)
+		return true;

 	if (instance->database->GetPlugin().flags & DatabasePlugin::FLAG_REQUIRE_STORAGE) {
-		if (!InitStorage(error))
-			FatalError(error);
+		InitStorage();

 		if (instance->storage == nullptr) {
 			delete instance->database;
@@ -220,14 +203,13 @@ glue_db_init_and_load(void)
 				   "because the database does not need it");
 	}

-	if (!instance->database->Open(error))
-		FatalError(error);
+	instance->database->Open();

 	if (!instance->database->IsPlugin(simple_db_plugin))
 		return true;

 	SimpleDatabase &db = *(SimpleDatabase *)instance->database;
-	instance->update = new UpdateService(*instance->event_loop, db,
+	instance->update = new UpdateService(instance->event_loop, db,
 					     static_cast<CompositeStorage &>(*instance->storage),
 					     *instance);

@@ -248,49 +230,41 @@ InitDatabaseAndStorage()
 * Configure and initialize the sticker subsystem.
 */
 static void
-glue_sticker_init(void)
+glue_sticker_init()
 {
 #ifdef ENABLE_SQLITE
-	Error error;
-	auto sticker_file = config_get_path(CONF_STICKER_FILE, error);
-	if (sticker_file.IsNull()) {
-		if (error.IsDefined())
-			FatalError(error);
+	auto sticker_file = config_get_path(ConfigOption::STICKER_FILE);
+	if (sticker_file.IsNull())
 		return;
-	}

-	if (!sticker_global_init(std::move(sticker_file), error))
-		FatalError(error);
+	sticker_global_init(std::move(sticker_file));
 #endif
 }

-static bool
-glue_state_file_init(Error &error)
+static void
+glue_state_file_init()
 {
-	auto path_fs = config_get_path(CONF_STATE_FILE, error);
+	auto path_fs = config_get_path(ConfigOption::STATE_FILE);
 	if (path_fs.IsNull()) {
-		if (error.IsDefined())
-			return false;
-
 #ifdef ANDROID
 		const auto cache_dir = GetUserCacheDir();
 		if (cache_dir.IsNull())
-			return true;
+			return;

 		path_fs = AllocatedPath::Build(cache_dir, "state");
 #else
-		return true;
+		return;
 #endif
 	}

-	unsigned interval = config_get_unsigned(CONF_STATE_FILE_INTERVAL,
-						StateFile::DEFAULT_INTERVAL);
+	const auto interval =
+		config_get_unsigned(ConfigOption::STATE_FILE_INTERVAL,
+				    StateFile::DEFAULT_INTERVAL);

-	state_file = new StateFile(std::move(path_fs), interval,
-				   *instance->partition,
-				   *instance->event_loop);
-	state_file->Read();
-	return true;
+	instance->state_file = new StateFile(std::move(path_fs), interval,
+					     *instance->partition,
+					     instance->event_loop);
+	instance->state_file->Read();
 }

 /**
@@ -316,12 +290,12 @@ static void winsock_init(void)
 * Initialize the decoder and player core, including the music pipe.
 */
 static void
-initialize_decoder_and_player(void)
+initialize_decoder_and_player(const ReplayGainConfig &replay_gain_config)
 {
-	const struct config_param *param;
+	const ConfigParam *param;

 	size_t buffer_size;
-	param = config_get_param(CONF_AUDIO_BUFFER_SIZE);
+	param = config_get_param(ConfigOption::AUDIO_BUFFER_SIZE);
 	if (param != nullptr) {
 		char *test;
 		long tmp = strtol(param->value.c_str(), &test, 10);
@@ -342,7 +316,7 @@ initialize_decoder_and_player(void)
 				 (unsigned long)buffer_size);

 	float perc;
-	param = config_get_param(CONF_BUFFER_BEFORE_PLAY);
+	param = config_get_param(ConfigOption::BUFFER_BEFORE_PLAY);
 	if (param != nullptr) {
 		char *test;
 		perc = strtod(param->value.c_str(), &test);
@@ -360,45 +334,51 @@ initialize_decoder_and_player(void)
 		buffered_before_play = buffered_chunks;

 	const unsigned max_length =
-		config_get_positive(CONF_MAX_PLAYLIST_LENGTH,
+		config_get_positive(ConfigOption::MAX_PLAYLIST_LENGTH,
 				    DEFAULT_PLAYLIST_MAX_LENGTH);

+	AudioFormat configured_audio_format = AudioFormat::Undefined();
+	param = config_get_param(ConfigOption::AUDIO_OUTPUT_FORMAT);
+	if (param != nullptr) {
+		try {
+			configured_audio_format = ParseAudioFormat(param->value.c_str(),
+								   true);
+		} catch (const std::runtime_error &) {
+			std::throw_with_nested(FormatRuntimeError("error parsing line %i",
+								  param->line));
+		}
+	}
+
 	instance->partition = new Partition(*instance,
 					    max_length,
 					    buffered_chunks,
-					    buffered_before_play);
+					    buffered_before_play,
+					    configured_audio_format,
+					    replay_gain_config);
+
+	try {
+		param = config_get_param(ConfigOption::REPLAYGAIN);
+		if (param != nullptr)
+			instance->partition->replay_gain_mode =
+				FromString(param->value.c_str());
+	} catch (...) {
+		std::throw_with_nested(FormatRuntimeError("Failed to parse line %i",
+							  param->line));
+	}
 }

-/**
- * Handler for GlobalEvents::IDLE.
- */
-static void
-idle_event_emitted(void)
+void
+Instance::OnIdle(unsigned flags)
 {
 	/* send "idle" notifications to all subscribed
 	   clients */
-	unsigned flags = idle_get();
-	if (flags != 0)
-		instance->client_list->IdleAdd(flags);
+	client_list->IdleAdd(flags);

 	if (flags & (IDLE_PLAYLIST|IDLE_PLAYER|IDLE_MIXER|IDLE_OUTPUT) &&
 	    state_file != nullptr)
 		state_file->CheckModified();
 }

-#ifdef WIN32
-
-/**
- * Handler for GlobalEvents::SHUTDOWN.
- */
-static void
-shutdown_event_emitted(void)
-{
-	instance->event_loop->Break();
-}
-
-#endif
-
 #ifndef ANDROID

 int main(int argc, char *argv[])
@@ -412,38 +392,29 @@ int main(int argc, char *argv[])

 #endif

-static int mpd_main_after_fork(struct options);
+static int
+mpd_main_after_fork(const Config &config);

 #ifdef ANDROID
 static inline
 #endif
 int mpd_main(int argc, char *argv[])
-{
+try {
 	struct options options;
-	Error error;
+
+#ifdef ENABLE_DAEMON
+	daemonize_close_stdin();
+#endif

 #ifndef ANDROID
-	daemonize_close_stdin();
-
 #ifdef HAVE_LOCALE_H
 	/* initialize locale */
 	setlocale(LC_CTYPE,"");
-#endif
-
-#ifdef HAVE_GLIB
-	g_set_application_name("Music Player Daemon");
-
-#if !GLIB_CHECK_VERSION(2,32,0)
-	/* enable GLib's thread safety code */
-	g_thread_init(nullptr);
-#endif
+	setlocale(LC_COLLATE, "");
 #endif
 #endif

-	if (!IcuInit(error)) {
-		LogError(error);
-		return EXIT_FAILURE;
-	}
+	IcuInit();

 	winsock_init();
 	io_thread_init();
@@ -453,47 +424,32 @@ int mpd_main(int argc, char *argv[])
 	(void)argc;
 	(void)argv;

-	{
-		const auto sdcard = Environment::getExternalStorageDirectory();
-		if (!sdcard.IsNull()) {
-			const auto config_path =
-				AllocatedPath::Build(sdcard, "mpd.conf");
-			if (FileExists(config_path) &&
-			    !ReadConfigFile(config_path, error)) {
-				LogError(error);
-				return EXIT_FAILURE;
-			}
-		}
+	const auto sdcard = Environment::getExternalStorageDirectory();
+	if (!sdcard.IsNull()) {
+		const auto config_path =
+			AllocatedPath::Build(sdcard, "mpd.conf");
+		if (FileExists(config_path))
+			ReadConfigFile(config_path);
 	}
 #else
-	if (!parse_cmdline(argc, argv, &options, error)) {
-		LogError(error);
-		return EXIT_FAILURE;
-	}
-
-	if (!glue_daemonize_init(&options, error)) {
-		LogError(error);
-		return EXIT_FAILURE;
-	}
+	ParseCommandLine(argc, argv, &options);
+#endif
+
+	const auto config = LoadConfig();
+
+#ifdef ENABLE_DAEMON
+	glue_daemonize_init(&options);
 #endif

-	stats_global_init();
 	TagLoadConfig();

-	if (!log_init(options.verbose, options.log_stderr, error)) {
-		LogError(error);
-		return EXIT_FAILURE;
-	}
+	log_init(options.verbose, options.log_stderr);

 	instance = new Instance();
-	instance->event_loop = new EventLoop();

 #ifdef ENABLE_NEIGHBOR_PLUGINS
 	instance->neighbors = new NeighborGlue();
-	if (!instance->neighbors->Init(io_thread_get(), *instance, error)) {
-		LogError(error);
-		return EXIT_FAILURE;
-	}
+	instance->neighbors->Init(io_thread_get(), *instance);

 	if (instance->neighbors->IsEmpty()) {
 		delete instance->neighbors;
@@ -501,18 +457,15 @@ int mpd_main(int argc, char *argv[])
 	}
 #endif

-	const unsigned max_clients = config_get_positive(CONF_MAX_CONN, 10);
+	const unsigned max_clients =
+		config_get_positive(ConfigOption::MAX_CONN, 10);
 	instance->client_list = new ClientList(max_clients);

-	initialize_decoder_and_player();
+	initialize_decoder_and_player(config.replay_gain);

-	if (!listen_global_init(*instance->event_loop, *instance->partition,
-				error)) {
-		LogError(error);
-		return EXIT_FAILURE;
-	}
+	listen_global_init(instance->event_loop, *instance->partition);

-#ifndef ANDROID
+#ifdef ENABLE_DAEMON
 	daemonize_set_user();
 	daemonize_begin(options.daemon);
 #endif
@@ -525,43 +478,32 @@ int mpd_main(int argc, char *argv[])
 	   This must be run after forking; if dispatch is called before forking,
 	   the child process will have a broken internal dispatch state. */
 	dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
-		exit(mpd_main_after_fork(options));
+		exit(mpd_main_after_fork(config));
 	});
 	dispatch_main();
 	return EXIT_FAILURE; // unreachable, because dispatch_main never returns
 #else
-	return mpd_main_after_fork(options);
+	return mpd_main_after_fork(config);
 #endif
+} catch (const std::exception &e) {
+	LogError(e);
+	return EXIT_FAILURE;
 }

-static int mpd_main_after_fork(struct options options)
-{
-	Error error;
-
-	GlobalEvents::Initialize(*instance->event_loop);
-	GlobalEvents::Register(GlobalEvents::IDLE, idle_event_emitted);
-#ifdef WIN32
-	GlobalEvents::Register(GlobalEvents::SHUTDOWN, shutdown_event_emitted);
-#endif
-
+static int
+mpd_main_after_fork(const Config &config)
+try {
 	ConfigureFS();

-	if (!glue_mapper_init(error)) {
-		LogError(error);
-		return EXIT_FAILURE;
-	}
+	glue_mapper_init();

 	initPermissions();
-	playlist_global_init();
 	spl_global_init();
 #ifdef ENABLE_ARCHIVE
 	archive_plugin_init_all();
 #endif

-	if (!pcm_convert_global_init(error)) {
-		LogError(error);
-		return EXIT_FAILURE;
-	}
+	pcm_convert_global_init();

 	decoder_plugin_init_all();

@@ -572,36 +514,34 @@ static int mpd_main_after_fork(struct options options)
 	glue_sticker_init();

 	command_init();
-	initAudioConfig();
-	instance->partition->outputs.Configure(*instance->event_loop,
+
+	instance->partition->outputs.Configure(instance->event_loop,
+					       config.replay_gain,
 					       instance->partition->pc);
+	instance->partition->UpdateEffectiveReplayGainMode();
+
 	client_manager_init();
-	replay_gain_global_init();
-
-	if (!input_stream_global_init(error)) {
-		LogError(error);
-		return EXIT_FAILURE;
-	}
-
+	input_stream_global_init();
 	playlist_list_global_init();

-#ifndef ANDROID
+#ifdef ENABLE_DAEMON
 	daemonize_commit();
+#endif

-	setup_log_output(options.log_stderr);
+#ifndef ANDROID
+	setup_log_output();

-	SignalHandlersInit(*instance->event_loop);
+	SignalHandlersInit(instance->event_loop);
 #endif

 	io_thread_start();

 #ifdef ENABLE_NEIGHBOR_PLUGINS
-	if (instance->neighbors != nullptr &&
-	    !instance->neighbors->Open(error))
-		FatalError(error);
+	if (instance->neighbors != nullptr)
+		instance->neighbors->Open();
 #endif

-	ZeroconfInit(*instance->event_loop);
+	ZeroconfInit(instance->event_loop);

 	StartPlayerThread(instance->partition->pc);

@@ -615,25 +555,20 @@ static int mpd_main_after_fork(struct options options)
 	}
 #endif

-	if (!glue_state_file_init(error)) {
-		LogError(error);
-		return EXIT_FAILURE;
-	}
-
-	instance->partition->outputs.SetReplayGainMode(replay_gain_get_real_mode(instance->partition->playlist.queue.random));
+	glue_state_file_init();

 #ifdef ENABLE_DATABASE
-	if (config_get_bool(CONF_AUTO_UPDATE, false)) {
+	if (config_get_bool(ConfigOption::AUTO_UPDATE, false)) {
 #ifdef ENABLE_INOTIFY
 		if (instance->storage != nullptr &&
 		    instance->update != nullptr)
-			mpd_inotify_init(*instance->event_loop,
+			mpd_inotify_init(instance->event_loop,
 					 *instance->storage,
 					 *instance->update,
-					 config_get_unsigned(CONF_AUTO_UPDATE_DEPTH,
+					 config_get_unsigned(ConfigOption::AUTO_UPDATE_DEPTH,
 							     INT_MAX));
 #else
-		FormatWarning(main_domain,
+		FormatWarning(config_domain,
 			      "inotify: auto_update was disabled. enable during compilation phase");
 #endif
 	}
@@ -643,7 +578,7 @@ static int mpd_main_after_fork(struct options options)

 	/* enable all audio outputs (if not already done by
 	   playlist_state_restore() */
-	instance->partition->pc.UpdateAudio();
+	instance->partition->pc.LockUpdateAudio();

 #ifdef WIN32
 	win32_app_started();
@@ -653,8 +588,12 @@ static int mpd_main_after_fork(struct options options)
 	   a huge value to allow the kernel to reduce CPU wakeups */
 	SetThreadTimerSlackMS(100);

+#ifdef ENABLE_SYSTEMD_DAEMON
+	sd_notify(0, "READY=1");
+#endif
+
 	/* run the main loop */
-	instance->event_loop->Run();
+	instance->event_loop.Run();

 #ifdef WIN32
 	win32_app_stopping();
@@ -669,9 +608,9 @@ static int mpd_main_after_fork(struct options options)
 		instance->update->CancelAllAsync();
 #endif

-	if (state_file != nullptr) {
-		state_file->Write();
-		delete state_file;
+	if (instance->state_file != nullptr) {
+		instance->state_file->Write();
+		delete instance->state_file;
 	}

 	instance->partition->pc.Kill();
@@ -701,8 +640,6 @@ static int mpd_main_after_fork(struct options options)
 	sticker_global_finish();
 #endif

-	GlobalEvents::Deinitialize();
-
 	playlist_list_global_finish();
 	input_stream_global_finish();

@@ -710,6 +647,8 @@ static int mpd_main_after_fork(struct options options)
 	mapper_finish();
 #endif

+	DeinitFS();
+
 	delete instance->partition;
 	command_finish();
 	decoder_plugin_deinit_all();
@@ -721,12 +660,13 @@ static int mpd_main_after_fork(struct options options)
 #ifndef ANDROID
 	SignalHandlersFinish();
 #endif
-	delete instance->event_loop;
 	delete instance;
 	instance = nullptr;
-#ifndef ANDROID
+
+#ifdef ENABLE_DAEMON
 	daemonize_finish();
 #endif
+
 #ifdef WIN32
 	WSACleanup();
 #endif
@@ -735,6 +675,9 @@ static int mpd_main_after_fork(struct options options)

 	log_deinit();
 	return EXIT_SUCCESS;
+} catch (const std::exception &e) {
+	LogError(e);
+	return EXIT_FAILURE;
 }

 #ifdef ANDROID
@@ -760,7 +703,7 @@ JNIEXPORT void JNICALL
 Java_org_musicpd_Bridge_shutdown(JNIEnv *, jclass)
 {
 	if (instance != nullptr)
-		instance->event_loop->Break();
+		instance->Shutdown();
 }

 #endif
--- a/src/Main.hxx
+++ b/src/Main.hxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * Copyright 2003-2017 The Music Player Daemon Project
 * http://www.musicpd.org
 *
 * This program is free software; you can redistribute it and/or modify
@@ -61,7 +61,7 @@ win32_main(int argc, char *argv[]);
 * This function should be called just before entering main loop.
 */
 void
-win32_app_started(void);
+win32_app_started();

 /**
 * When running as a service reports to service control manager
@@ -71,7 +71,7 @@ win32_app_started(void);
 * This function should be called just after leaving main loop.
 */
 void
-win32_app_stopping(void);
+win32_app_stopping();

 #endif

--- a/src/Mapper.cxx
+++ b/src/Mapper.cxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * Copyright 2003-2017 The Music Player Daemon Project
 * http://www.musicpd.org
 *
 * This program is free software; you can redistribute it and/or modify
@@ -24,9 +24,8 @@
 #include "config.h"
 #include "Mapper.hxx"
 #include "fs/AllocatedPath.hxx"
-#include "fs/Traits.hxx"
-#include "fs/Charset.hxx"
 #include "fs/CheckFile.hxx"
+#include "util/StringCompare.hxx"

 #ifdef ENABLE_DATABASE
 #include "storage/StorageInterface.hxx"
@@ -59,7 +58,8 @@ mapper_init(AllocatedPath &&_playlist_dir)
 		mapper_set_playlist_dir(std::move(_playlist_dir));
 }

-void mapper_finish(void)
+void
+mapper_finish()
 {
 }

@@ -86,9 +86,9 @@ map_uri_fs(const char *uri)
 }

 std::string
-map_fs_to_utf8(const char *path_fs)
+map_fs_to_utf8(Path path_fs)
 {
-	if (PathTraitsFS::IsSeparator(path_fs[0])) {
+	if (path_fs.IsAbsolute()) {
 		if (instance->storage == nullptr)
 			return std::string();

@@ -96,18 +96,20 @@ map_fs_to_utf8(const char *path_fs)
 		if (music_dir_fs.IsNull())
 			return std::string();

-		path_fs = music_dir_fs.RelativeFS(path_fs);
-		if (path_fs == nullptr || *path_fs == 0)
+		auto relative = music_dir_fs.Relative(path_fs);
+		if (relative == nullptr || StringIsEmpty(relative))
 			return std::string();
+
+		path_fs = Path::FromFS(relative);
 	}

-	return PathToUTF8(path_fs);
+	return path_fs.ToUTF8();
 }

 #endif

 const AllocatedPath &
-map_spl_path(void)
+map_spl_path()
 {
 	return playlist_dir_fs;
 }
--- a/src/Mapper.hxx
+++ b/src/Mapper.hxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * Copyright 2003-2017 The Music Player Daemon Project
 * http://www.musicpd.org
 *
 * This program is free software; you can redistribute it and/or modify
@@ -30,12 +30,14 @@

 #define PLAYLIST_FILE_SUFFIX ".m3u"

+class Path;
 class AllocatedPath;

 void
 mapper_init(AllocatedPath &&playlist_dir);

-void mapper_finish(void);
+void
+mapper_finish();

 #ifdef ENABLE_DATABASE

@@ -58,7 +60,7 @@ map_uri_fs(const char *uri);
 */
 gcc_pure
 std::string
-map_fs_to_utf8(const char *path_fs);
+map_fs_to_utf8(Path path_fs);

 #endif

@@ -67,7 +69,7 @@ map_fs_to_utf8(const char *path_fs);
 */
 gcc_const
 const AllocatedPath &
-map_spl_path(void);
+map_spl_path();

 /**
 * Maps a playlist name (without the ".m3u" suffix) to a file system
--- a/src/MixRampInfo.hxx
+++ b/src/MixRampInfo.hxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * Copyright 2003-2017 The Music Player Daemon Project
 * http://www.musicpd.org
 *
 * This program is free software; you can redistribute it and/or modify
--- a/src/MusicBuffer.cxx
+++ b/src/MusicBuffer.cxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * Copyright 2003-2017 The Music Player Daemon Project
 * http://www.musicpd.org
 *
 * This program is free software; you can redistribute it and/or modify
@@ -20,20 +20,17 @@
 #include "config.h"
 #include "MusicBuffer.hxx"
 #include "MusicChunk.hxx"
-#include "system/FatalError.hxx"

 #include <assert.h>

 MusicBuffer::MusicBuffer(unsigned num_chunks)
 	:buffer(num_chunks) {
-	if (buffer.IsOOM())
-		FatalError("Failed to allocate buffer");
 }

 MusicChunk *
 MusicBuffer::Allocate()
 {
-	const ScopeLock protect(mutex);
+	const std::lock_guard<Mutex> protect(mutex);
 	return buffer.Allocate();
 }

@@ -42,7 +39,7 @@ MusicBuffer::Return(MusicChunk *chunk)
 {
 	assert(chunk != nullptr);

-	const ScopeLock protect(mutex);
+	const std::lock_guard<Mutex> protect(mutex);

 	if (chunk->other != nullptr) {
 		assert(chunk->other->other == nullptr);
--- a/src/MusicBuffer.hxx
+++ b/src/MusicBuffer.hxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * Copyright 2003-2017 The Music Player Daemon Project
 * http://www.musicpd.org
 *
 * This program is free software; you can redistribute it and/or modify
--- a/src/MusicChunk.cxx
+++ b/src/MusicChunk.cxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * Copyright 2003-2017 The Music Player Daemon Project
 * http://www.musicpd.org
 *
 * This program is free software; you can redistribute it and/or modify
--- a/src/MusicChunk.hxx
+++ b/src/MusicChunk.hxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * Copyright 2003-2017 The Music Player Daemon Project
 * http://www.musicpd.org
 *
 * This program is free software; you can redistribute it and/or modify
@@ -48,7 +48,7 @@ struct MusicChunk {
 	 * An optional chunk which should be mixed into this chunk.
 	 * This is used for cross-fading.
 	 */
-	MusicChunk *other;
+	MusicChunk *other = nullptr;

 	/**
 	 * The current mix ratio for cross-fading: 1.0 means play 100%
@@ -57,7 +57,7 @@ struct MusicChunk {
 	float mix_ratio;

 	/** number of bytes stored in this chunk */
-	uint16_t length;
+	uint16_t length = 0;

 	/** current bit rate of the source file */
 	uint16_t bit_rate;
@@ -71,7 +71,7 @@ struct MusicChunk {
 	 * object is owned by this chunk, and must be freed when this
 	 * chunk is deinitialized.
 	 */
-	Tag *tag;
+	Tag *tag = nullptr;

 	/**
 	 * Replay gain information associated with this chunk.
@@ -84,7 +84,7 @@ struct MusicChunk {
 	 * changed since the last chunk.  The magic value 0 indicates
 	 * that there is no replay gain info available.
 	 */
-	unsigned replay_gain_serial;
+	unsigned replay_gain_serial = 0;

 	/** the data (probably PCM) */
 	uint8_t data[CHUNK_SIZE];
@@ -93,14 +93,14 @@ struct MusicChunk {
 	AudioFormat audio_format;
 #endif

-	MusicChunk()
-		:other(nullptr),
-		 length(0),
-		 tag(nullptr),
-		 replay_gain_serial(0) {}
+	MusicChunk() = default;
+
+	MusicChunk(const MusicChunk &) = delete;

 	~MusicChunk();

+	MusicChunk &operator=(const MusicChunk &) = delete;
+
 	bool IsEmpty() const {
 		return length == 0 && tag == nullptr;
 	}
@@ -119,13 +119,10 @@ struct MusicChunk {
 	 * where you may write into.  After you are finished, call
 	 * Expand().
 	 *
-	 * @param chunk the MusicChunk object
-	 * @param audio_format the audio format for the appended data;
+	 * @param af the audio format for the appended data;
 	 * must stay the same for the life cycle of this chunk
 	 * @param data_time the time within the song
 	 * @param bit_rate the current bit rate of the source file
-	 * @param max_length_r the maximum write length is returned
-	 * here
 	 * @return a writable buffer, or nullptr if the chunk is full
 	 */
 	WritableBuffer<void> Write(AudioFormat af,
@@ -136,8 +133,7 @@ struct MusicChunk {
 	 * Increases the length of the chunk after the caller has written to
 	 * the buffer returned by Write().
 	 *
-	 * @param chunk the MusicChunk object
-	 * @param audio_format the audio format for the appended data; must
+	 * @param af the audio format for the appended data; must
 	 * stay the same for the life cycle of this chunk
 	 * @param length the number of bytes which were appended
 	 * @return true if the chunk is full
--- a/src/MusicPipe.cxx
+++ b/src/MusicPipe.cxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * Copyright 2003-2017 The Music Player Daemon Project
 * http://www.musicpd.org
 *
 * This program is free software; you can redistribute it and/or modify
@@ -27,7 +27,7 @@
 bool
 MusicPipe::Contains(const MusicChunk *chunk) const
 {
-	const ScopeLock protect(mutex);
+	const std::lock_guard<Mutex> protect(mutex);

 	for (const MusicChunk *i = head; i != nullptr; i = i->next)
 		if (i == chunk)
@@ -41,7 +41,7 @@ MusicPipe::Contains(const MusicChunk *chunk) const
 MusicChunk *
 MusicPipe::Shift()
 {
-	const ScopeLock protect(mutex);
+	const std::lock_guard<Mutex> protect(mutex);

 	MusicChunk *chunk = head;
 	if (chunk != nullptr) {
@@ -87,7 +87,7 @@ MusicPipe::Push(MusicChunk *chunk)
 	assert(!chunk->IsEmpty());
 	assert(chunk->length == 0 || chunk->audio_format.IsValid());

-	const ScopeLock protect(mutex);
+	const std::lock_guard<Mutex> protect(mutex);

 	assert(size > 0 || !audio_format.IsDefined());
 	assert(!audio_format.IsDefined() ||
--- a/src/MusicPipe.hxx
+++ b/src/MusicPipe.hxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * Copyright 2003-2017 The Music Player Daemon Project
 * http://www.musicpd.org
 *
 * This program is free software; you can redistribute it and/or modify
@@ -38,31 +38,28 @@ class MusicBuffer;
 */
 class MusicPipe {
 	/** the first chunk */
-	MusicChunk *head;
+	MusicChunk *head = nullptr;

 	/** a pointer to the tail of the chunk */
-	MusicChunk **tail_r;
+	MusicChunk **tail_r = &head;

 	/** the current number of chunks */
-	unsigned size;
+	unsigned size = 0;

 	/** a mutex which protects #head and #tail_r */
 	mutable Mutex mutex;

 #ifndef NDEBUG
-	AudioFormat audio_format;
+	AudioFormat audio_format = AudioFormat::Undefined();
 #endif

 public:
 	/**
 	 * Creates a new #MusicPipe object.  It is empty.
 	 */
-	MusicPipe()
-		:head(nullptr), tail_r(&head), size(0) {
-#ifndef NDEBUG
-		audio_format.Clear();
-#endif
-	}
+	MusicPipe() = default;
+
+	MusicPipe(const MusicPipe &) = delete;

 	/**
 	 * Frees the object.  It must be empty now.
@@ -72,6 +69,8 @@ public:
 		assert(tail_r == &head);
 	}

+	MusicPipe &operator=(const MusicPipe &) = delete;
+
 #ifndef NDEBUG
 	/**
 	 * Checks if the audio format if the chunk is equal to the specified
--- a/src/Partition.cxx
+++ b/src/Partition.cxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * Copyright 2003-2017 The Music Player Daemon Project
 * http://www.musicpd.org
 *
 * This program is free software; you can redistribute it and/or modify
@@ -19,18 +19,66 @@

 #include "config.h"
 #include "Partition.hxx"
+#include "Instance.hxx"
 #include "DetachedSong.hxx"
-#include "output/MultipleOutputs.hxx"
 #include "mixer/Volume.hxx"
-#include "Idle.hxx"
-#include "GlobalEvents.hxx"
+#include "IdleFlags.hxx"
+
+Partition::Partition(Instance &_instance,
+		     unsigned max_length,
+		     unsigned buffer_chunks,
+		     unsigned buffered_before_play,
+		     AudioFormat configured_audio_format,
+		     const ReplayGainConfig &replay_gain_config)
+	:instance(_instance),
+	 global_events(instance.event_loop, BIND_THIS_METHOD(OnGlobalEvent)),
+	 playlist(max_length, *this),
+	 outputs(*this),
+	 pc(*this, outputs, buffer_chunks, buffered_before_play,
+	    configured_audio_format, replay_gain_config)
+{
+	UpdateEffectiveReplayGainMode();
+}
+
+void
+Partition::EmitIdle(unsigned mask)
+{
+	instance.EmitIdle(mask);
+}
+
+void
+Partition::UpdateEffectiveReplayGainMode()
+{
+	auto mode = replay_gain_mode;
+	if (mode == ReplayGainMode::AUTO)
+	    mode = playlist.queue.random
+		    ? ReplayGainMode::TRACK
+		    : ReplayGainMode::ALBUM;
+
+	pc.LockSetReplayGainMode(mode);
+
+	outputs.SetReplayGainMode(mode);
+}

 #ifdef ENABLE_DATABASE

+const Database *
+Partition::GetDatabase() const
+{
+	return instance.GetDatabase();
+}
+
+const Database &
+Partition::GetDatabaseOrThrow() const
+{
+	return instance.GetDatabaseOrThrow();
+}
+
 void
 Partition::DatabaseModified(const Database &db)
 {
 	playlist.DatabaseModified(db);
+	EmitIdle(IDLE_DATABASE);
 }

 #endif
@@ -51,16 +99,34 @@ Partition::SyncWithPlayer()
 	playlist.SyncWithPlayer(pc);
 }

+void
+Partition::OnQueueModified()
+{
+	EmitIdle(IDLE_PLAYLIST);
+}
+
+void
+Partition::OnQueueOptionsChanged()
+{
+	EmitIdle(IDLE_OPTIONS);
+}
+
+void
+Partition::OnQueueSongStarted()
+{
+	EmitIdle(IDLE_PLAYER);
+}
+
 void
 Partition::OnPlayerSync()
 {
-	GlobalEvents::Emit(GlobalEvents::PLAYLIST);
+	EmitGlobalEvent(SYNC_WITH_PLAYER);
 }

 void
 Partition::OnPlayerTagModified()
 {
-	GlobalEvents::Emit(GlobalEvents::TAG);
+	EmitGlobalEvent(TAG_MODIFIED);
 }

 void
@@ -69,5 +135,15 @@ Partition::OnMixerVolumeChanged(gcc_unused Mixer &mixer, gcc_unused int volume)
 	InvalidateHardwareVolume();

 	/* notify clients */
-	idle_add(IDLE_MIXER);
+	EmitIdle(IDLE_MIXER);
+}
+
+void
+Partition::OnGlobalEvent(unsigned mask)
+{
+	if ((mask & TAG_MODIFIED) != 0)
+		TagModified();
+
+	if ((mask & SYNC_WITH_PLAYER) != 0)
+		SyncWithPlayer();
 }
--- a/src/Partition.hxx
+++ b/src/Partition.hxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * Copyright 2003-2017 The Music Player Daemon Project
 * http://www.musicpd.org
 *
 * This program is free software; you can redistribute it and/or modify
@@ -20,11 +20,14 @@
 #ifndef MPD_PARTITION_HXX
 #define MPD_PARTITION_HXX

+#include "event/MaskMonitor.hxx"
 #include "queue/Playlist.hxx"
+#include "queue/Listener.hxx"
 #include "output/MultipleOutputs.hxx"
 #include "mixer/Listener.hxx"
-#include "PlayerControl.hxx"
-#include "PlayerListener.hxx"
+#include "player/Control.hxx"
+#include "player/Listener.hxx"
+#include "ReplayGainMode.hxx"
 #include "Chrono.hxx"
 #include "Compiler.h"

@@ -36,39 +39,50 @@ class SongLoader;
 * A partition of the Music Player Daemon.  It is a separate unit with
 * a playlist, a player, outputs etc.
 */
-struct Partition final : private PlayerListener, private MixerListener {
+struct Partition final : QueueListener, PlayerListener, MixerListener {
+	static constexpr unsigned TAG_MODIFIED = 0x1;
+	static constexpr unsigned SYNC_WITH_PLAYER = 0x2;
+
 	Instance &instance;

+	MaskMonitor global_events;
+
 	struct playlist playlist;

 	MultipleOutputs outputs;

 	PlayerControl pc;

+	ReplayGainMode replay_gain_mode = ReplayGainMode::OFF;
+
 	Partition(Instance &_instance,
 		  unsigned max_length,
 		  unsigned buffer_chunks,
-		  unsigned buffered_before_play)
-		:instance(_instance), playlist(max_length),
-		 outputs(*this),
-		 pc(*this, outputs, buffer_chunks, buffered_before_play) {}
+		  unsigned buffered_before_play,
+		  AudioFormat configured_audio_format,
+		  const ReplayGainConfig &replay_gain_config);
+
+	void EmitGlobalEvent(unsigned mask) {
+		global_events.OrMask(mask);
+	}
+
+	void EmitIdle(unsigned mask);

 	void ClearQueue() {
 		playlist.Clear(pc);
 	}

 	unsigned AppendURI(const SongLoader &loader,
-			   const char *uri_utf8,
-			   Error &error) {
-		return playlist.AppendURI(pc, loader, uri_utf8, error);
+			   const char *uri_utf8) {
+		return playlist.AppendURI(pc, loader, uri_utf8);
 	}

-	PlaylistResult DeletePosition(unsigned position) {
-		return playlist.DeletePosition(pc, position);
+	void DeletePosition(unsigned position) {
+		playlist.DeletePosition(pc, position);
 	}

-	PlaylistResult DeleteId(unsigned id) {
-		return playlist.DeleteId(pc, id);
+	void DeleteId(unsigned id) {
+		playlist.DeleteId(pc, id);
 	}

 	/**
@@ -77,60 +91,53 @@ struct Partition final : private PlayerListener, private MixerListener {
 	 * @param start the position of the first song to delete
 	 * @param end the position after the last song to delete
 	 */
-	PlaylistResult DeleteRange(unsigned start, unsigned end) {
-		return playlist.DeleteRange(pc, start, end);
+	void DeleteRange(unsigned start, unsigned end) {
+		playlist.DeleteRange(pc, start, end);
 	}

-#ifdef ENABLE_DATABASE
-
-	void DeleteSong(const char *uri) {
-		playlist.DeleteSong(pc, uri);
+	void StaleSong(const char *uri) {
+		playlist.StaleSong(pc, uri);
 	}

-#endif
-
 	void Shuffle(unsigned start, unsigned end) {
 		playlist.Shuffle(pc, start, end);
 	}

-	PlaylistResult MoveRange(unsigned start, unsigned end, int to) {
-		return playlist.MoveRange(pc, start, end, to);
+	void MoveRange(unsigned start, unsigned end, int to) {
+		playlist.MoveRange(pc, start, end, to);
 	}

-	PlaylistResult MoveId(unsigned id, int to) {
-		return playlist.MoveId(pc, id, to);
+	void MoveId(unsigned id, int to) {
+		playlist.MoveId(pc, id, to);
 	}

-	PlaylistResult SwapPositions(unsigned song1, unsigned song2) {
-		return playlist.SwapPositions(pc, song1, song2);
+	void SwapPositions(unsigned song1, unsigned song2) {
+		playlist.SwapPositions(pc, song1, song2);
 	}

-	PlaylistResult SwapIds(unsigned id1, unsigned id2) {
-		return playlist.SwapIds(pc, id1, id2);
+	void SwapIds(unsigned id1, unsigned id2) {
+		playlist.SwapIds(pc, id1, id2);
 	}

-	PlaylistResult SetPriorityRange(unsigned start_position,
-					unsigned end_position,
-					uint8_t priority) {
-		return playlist.SetPriorityRange(pc,
-						 start_position, end_position,
-						 priority);
+	void SetPriorityRange(unsigned start_position, unsigned end_position,
+			      uint8_t priority) {
+		playlist.SetPriorityRange(pc, start_position, end_position,
+					  priority);
 	}

-	PlaylistResult SetPriorityId(unsigned song_id,
-				     uint8_t priority) {
-		return playlist.SetPriorityId(pc, song_id, priority);
+	void SetPriorityId(unsigned song_id, uint8_t priority) {
+		playlist.SetPriorityId(pc, song_id, priority);
 	}

 	void Stop() {
 		playlist.Stop(pc);
 	}

-	PlaylistResult PlayPosition(int position) {
+	void PlayPosition(int position) {
 		return playlist.PlayPosition(pc, position);
 	}

-	PlaylistResult PlayId(int id) {
+	void PlayId(int id) {
 		return playlist.PlayId(pc, id);
 	}

@@ -142,17 +149,16 @@ struct Partition final : private PlayerListener, private MixerListener {
 		return playlist.PlayPrevious(pc);
 	}

-	PlaylistResult SeekSongPosition(unsigned song_position,
-					SongTime seek_time) {
-		return playlist.SeekSongPosition(pc, song_position, seek_time);
+	void SeekSongPosition(unsigned song_position, SongTime seek_time) {
+		playlist.SeekSongPosition(pc, song_position, seek_time);
 	}

-	PlaylistResult SeekSongId(unsigned song_id, SongTime seek_time) {
-		return playlist.SeekSongId(pc, song_id, seek_time);
+	void SeekSongId(unsigned song_id, SongTime seek_time) {
+		playlist.SeekSongId(pc, song_id, seek_time);
 	}

-	PlaylistResult SeekCurrent(SignedSongTime seek_time, bool relative) {
-		return playlist.SeekCurrent(pc, seek_time, relative);
+	void SeekCurrent(SignedSongTime seek_time, bool relative) {
+		playlist.SeekCurrent(pc, seek_time, relative);
 	}

 	void SetRepeat(bool new_value) {
@@ -175,7 +181,28 @@ struct Partition final : private PlayerListener, private MixerListener {
 		playlist.SetConsume(new_value);
 	}

+	void SetReplayGainMode(ReplayGainMode mode) {
+		replay_gain_mode = mode;
+		UpdateEffectiveReplayGainMode();
+	}
+
+	/**
+	 * Publishes the effective #ReplayGainMode to all subsystems.
+	 * #ReplayGainMode::AUTO is substituted.
+	 */
+	void UpdateEffectiveReplayGainMode();
+
 #ifdef ENABLE_DATABASE
+	/**
+	 * Returns the global #Database instance.  May return nullptr
+	 * if this MPD configuration has no database (no
+	 * music_directory was configured).
+	 */
+	const Database *GetDatabase() const;
+
+	gcc_pure
+	const Database &GetDatabaseOrThrow() const;
+
 	/**
 	 * The database has been modified.  Propagate the change to
 	 * all subsystems.
@@ -195,12 +222,20 @@ struct Partition final : private PlayerListener, private MixerListener {
 	void SyncWithPlayer();

 private:
+	/* virtual methods from class QueueListener */
+	void OnQueueModified() override;
+	void OnQueueOptionsChanged() override;
+	void OnQueueSongStarted() override;
+
 	/* virtual methods from class PlayerListener */
-	virtual void OnPlayerSync() override;
-	virtual void OnPlayerTagModified() override;
+	void OnPlayerSync() override;
+	void OnPlayerTagModified() override;

 	/* virtual methods from class MixerListener */
-	virtual void OnMixerVolumeChanged(Mixer &mixer, int volume) override;
+	void OnMixerVolumeChanged(Mixer &mixer, int volume) override;
+
+	/* callback for #global_events */
+	void OnGlobalEvent(unsigned mask);
 };

 #endif
--- a/src/Permission.cxx
+++ b/src/Permission.cxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * Copyright 2003-2017 The Music Player Daemon Project
 * http://www.musicpd.org
 *
 * This program is free software; you can redistribute it and/or modify
@@ -19,7 +19,7 @@

 #include "config.h"
 #include "Permission.hxx"
-#include "config/ConfigData.hxx"
+#include "config/Param.hxx"
 #include "config/ConfigGlobal.hxx"
 #include "config/ConfigOption.hxx"
 #include "system/FatalError.hxx"
@@ -87,12 +87,12 @@ static unsigned parsePermissions(const char *string)
 void initPermissions(void)
 {
 	unsigned permission;
-	const struct config_param *param;
+	const ConfigParam *param;

 	permission_default = PERMISSION_READ | PERMISSION_ADD |
 	    PERMISSION_CONTROL | PERMISSION_ADMIN;

-	param = config_get_param(CONF_PASSWORD);
+	param = config_get_param(ConfigOption::PASSWORD);

 	if (param) {
 		permission_default = 0;
@@ -118,7 +118,7 @@ void initPermissions(void)
 		} while ((param = param->next) != nullptr);
 	}

-	param = config_get_param(CONF_DEFAULT_PERMS);
+	param = config_get_param(ConfigOption::DEFAULT_PERMS);

 	if (param)
 		permission_default = parsePermissions(param->value.c_str());
--- a/src/Permission.hxx
+++ b/src/Permission.hxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * Copyright 2003-2017 The Music Player Daemon Project
 * http://www.musicpd.org
 *
 * This program is free software; you can redistribute it and/or modify
@@ -28,8 +28,10 @@ static constexpr unsigned PERMISSION_ADMIN = 8;

 int getPermissionFromPassword(char const* password, unsigned* permission);

-unsigned getDefaultPermissions(void);
+unsigned
+getDefaultPermissions();

-void initPermissions(void);
+void
+initPermissions();

 #endif
--- a/Show More
+++ b/Show More