release v0.20.6

The TAG_MODIFIED handler (i.e. playlist::TagModified()) works only if
the modified song is the current song - something that is not updated
until SYNC_WITH_PLAYER is finished.  This fixes tag updates right
after a new song is started.

NEWS

@@ -1,3 +1,31 @@
+ver 0.20.6 (2017/03/10)
+* input
+  - curl: fix headers after HTTP redirect to Shoutcast server
+* decoder
+  - ffmpeg: re-enable as fallback
+  - mpcdec: fix crash (division by zero) after seeking
+  - sidplay: make compatible with libsidplayfp < 1.8
+* fix stream tags after automatic song change
+* workaround for GCC 4.9.4 / libstdc++ bug (build failure)
+
+ver 0.20.5 (2017/02/20)
+* tags
+  - id3: fix memory leak on corrupt ID3 tags
+* decoder
+  - sidplay: don't require libsidutils when building with libsidplayfp
+* output
+  - httpd: fix two buffer overflows in IcyMetaData length calculation
+* mixer
+  - alsa: fix crash bug
+
+ver 0.20.4 (2017/02/01)
+* input
+  - nfs: fix freeze after reconnect
+* output
+  - sndio: work around a libroar C++ incompatibility
+* workaround for GCC 4.9 "constexpr" bug
+* fix FreeBSD build failure
+
 ver 0.20.3 (2017/01/25)
 * protocol
   - "playlistadd" creates new playlist if it does not exist, as documented

android/build.py

@@ -87,9 +87,14 @@ class AndroidNdkToolchain:
         self.is_armv7 = self.is_arm and 'armv7' in self.cflags
         self.is_windows = False
 
-        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')
+        libcxx_path = os.path.join(ndk_path, 'sources/cxx-stl/llvm-libc++')
+        libcxx_libs_path = os.path.join(libcxx_path, 'libs', android_abi)
+
+        libstdcxx_cppflags = '-nostdinc++ -isystem ' + os.path.join(libcxx_path, 'include') + ' -isystem ' + os.path.join(ndk_path, 'sources/android/support/include')
+        libstdcxx_ldadd = os.path.join(libcxx_libs_path, 'libc++_static.a') + ' ' + os.path.join(libcxx_libs_path, 'libc++abi.a')
+
+        if self.is_armv7:
+            libstdcxx_ldadd += ' ' + os.path.join(libcxx_libs_path, 'libunwind.a')
 
         if use_cxx:
             self.libs += ' ' + libstdcxx_ldadd

configure.ac

@@ -1,10 +1,10 @@
 AC_PREREQ(2.60)
 
-AC_INIT(mpd, 0.20.3, musicpd-dev-team@lists.sourceforge.net)
+AC_INIT(mpd, 0.20.6, musicpd-dev-team@lists.sourceforge.net)
 
 VERSION_MAJOR=0
 VERSION_MINOR=20
-VERSION_REVISION=3
+VERSION_REVISION=6
 VERSION_EXTRA=0
 
 AC_CONFIG_SRCDIR([src/Main.cxx])
@@ -992,7 +992,7 @@ AM_CONDITIONAL(ENABLE_VORBIS_DECODER, test x$enable_vorbis = xyes || test x$enab
 dnl --------------------------------- sidplay ---------------------------------
 if test x$enable_sidplay != xno; then
 	dnl Check for libsidplayfp first
-	PKG_CHECK_MODULES([SIDPLAY], [libsidplayfp libsidutils],
+	PKG_CHECK_MODULES([SIDPLAY], [libsidplayfp],
 		[found_sidplayfp=yes],
 		[found_sidplayfp=no])
 	found_sidplay=$found_sidplayfp

doc/include/tags.xml

@@ -55,7 +55,8 @@
 
   <listitem>
     <para>
-      <varname>track</varname>: the track number within the album.
+      <varname>track</varname>: the decimal track number within the
+      album.
     </para>
   </listitem>
 
@@ -103,7 +104,8 @@
 
   <listitem>
     <para>
-      <varname>disc</varname>: the disc number in a multi-disc album.
+      <varname>disc</varname>: the decimal disc number in a multi-disc
+      album.
     </para>
   </listitem>
 

doc/user.xml

@@ -135,6 +135,91 @@ apt-get install g++ \
       </para>
 
       <programlisting>make install</programlisting>
+
+      <section id="windows_build">
+        <title>Compiling for Windows</title>
+
+        <para>
+          Even though it does not "feel" like a Windows application,
+          <application>MPD</application> works well under Windows.
+          Its build process follows the "Linux style", and may seem
+          awkward for Windows people (who are not used to compiling
+          their software, anyway).
+        </para>
+
+        <para>
+          Basically, there are three ways to compile
+          <application>MPD</application> for Windows:
+        </para>
+
+        <orderedlist>
+          <listitem>
+            <para>
+              Build on Windows for Windows.  All you need to do is
+              described above already: configure and make.
+            </para>
+
+            <para>
+              For Windows users, this is kind of unusual, because few
+              Windows users have a GNU toolchain and a UNIX shell
+              installed.
+            </para>
+          </listitem>
+
+          <listitem>
+            <para>
+              Build on Linux for Windows.  This is described above
+              already: configure and make.  You need the <ulink
+              url="https://mingw-w64.org/"><application>mingw-w64</application>
+              cross compiler</ulink>.  Pass
+              <parameter>--host=i686-w64-mingw32</parameter> (32 bit)
+              or <parameter>--host=x86_64-w64-mingw32</parameter> (64
+              bit) to configure.
+            </para>
+
+            <para>
+              This is somewhat natural for Linux users.  Many
+              distributions have <application>mingw-w64</application>
+              packages.  The remaining difficulty here is installing
+              all the external libraries.  And
+              <application>MPD</application> usually needs many,
+              making this method cumbersome for the casual user.
+            </para>
+          </listitem>
+
+          <listitem>
+            <para>
+              Build on Linux for Windows using the
+              <application>MPD</application>'s library build script.
+            </para>
+          </listitem>
+        </orderedlist>
+
+        <para>
+          This section is about the latter.
+        </para>
+
+        <para>
+          Just like with the native build, unpack the
+          <application>MPD</application> source tarball and change
+          into the directory.  Then, instead of
+          <command>./configure</command>, type:
+        </para>
+
+        <programlisting>./win32/build.py --64</programlisting>
+
+        <para>
+          This downloads various library sources, and then configures
+          and builds <application>MPD</application> (for x64; to build
+          a 32 bit binary, pass <parameter>--32</parameter>).  The
+          resulting EXE files is linked statically, i.e. it contains
+          all the libraries already, and you do not need carry DLLs
+          around.  It is large, but easy to use.  If you wish to have
+          a small <filename>mpd.exe</filename> with DLLs, you need to
+          compile manually, without the <filename>build.py</filename>
+          script.
+        </para>
+      </section>
     </section>
 
     <section id="systemd_socket">

python/build/libs.py

@@ -19,8 +19,8 @@ libvorbis = AutotoolsProject(
 )
 
 opus = AutotoolsProject(
-    'http://downloads.xiph.org/releases/opus/opus-1.1.3.tar.gz',
-    '32bbb6b557fe1b6066adc0ae1f08b629',
+    'http://downloads.xiph.org/releases/opus/opus-1.1.4.tar.gz',
+    '9122b6b380081dd2665189f97bfd777f04f92dc3ab6698eea1dbb27ad59d8692',
     'lib/libopus.a',
     ['--disable-shared', '--enable-static'],
 )
@@ -58,8 +58,8 @@ libmad = AutotoolsProject(
 )
 
 ffmpeg = FfmpegProject(
-    'http://ffmpeg.org/releases/ffmpeg-3.2.2.tar.xz',
-    '3f01bd1fe1a17a277f8c84869e5d9192b4b978cb660872aa2b54c3cc8a2fedfc',
+    'http://ffmpeg.org/releases/ffmpeg-3.2.4.tar.xz',
+    '6e38ff14f080c98b58cf5967573501b8cb586e3a173b591f3807d8f0660daf7a',
     'lib/libavcodec.a',
     [
         '--disable-shared', '--enable-static',

src/Partition.cxx

@@ -141,9 +141,9 @@ Partition::OnMixerVolumeChanged(gcc_unused Mixer &mixer, gcc_unused int volume)
 void
 Partition::OnGlobalEvent(unsigned mask)
 {
-	if ((mask & TAG_MODIFIED) != 0)
-		TagModified();
-
 	if ((mask & SYNC_WITH_PLAYER) != 0)
 		SyncWithPlayer();
+
+	if ((mask & TAG_MODIFIED) != 0)
+		TagModified();
 }

src/command/CommandError.cxx

@@ -29,6 +29,29 @@
 
 #include <assert.h>
 
+#define GLIBCXX_490 20140422
+#define GLIBCXX_491 20140716
+#define GLIBCXX_492 20141030
+#define GLIBCXX_492_Debian_9 20141220
+#define GLIBCXX_493 20150626
+#define GLIBCXX_494 20160803
+#define GLIBCXX_49X_NDK_r13b 20150123
+
+/* the big mess attempts to detect whether we're compiling with
+   libstdc++ 4.9.x; __GLIBCXX__ is a date tag and cannot be used to
+   check the major version; and just checking the compiler version
+   isn't enough, because somebody could use an old libstdc++ with
+   clang - SIGH! */
+#if GCC_OLDER_THAN(5,0) || (defined(__GLIBCXX__) &&		     \
+	(__GLIBCXX__ == GLIBCXX_490 || __GLIBCXX__ == GLIBCXX_491 || \
+	 __GLIBCXX__ == GLIBCXX_492 || \
+	 __GLIBCXX__ == GLIBCXX_492_Debian_9 || \
+	 __GLIBCXX__ == GLIBCXX_493 || \
+	 __GLIBCXX__ == GLIBCXX_494 || \
+	 __GLIBCXX__ == GLIBCXX_49X_NDK_r13b))
+#define GLIBCXX_49X
+#endif
+
 gcc_const
 static enum ack
 ToAck(PlaylistResult result)
@@ -100,13 +123,13 @@ ToAck(std::exception_ptr ep)
 		return ACK_ERROR_SYSTEM;
 	} catch (const std::invalid_argument &e) {
 		return ACK_ERROR_ARG;
-#if defined(__GLIBCXX__) && __GLIBCXX__ < 20151204
+#ifdef GLIBCXX_49X
 	} catch (const std::exception &e) {
 #else
 	} catch (...) {
 #endif
 		try {
-#if defined(__GLIBCXX__) && __GLIBCXX__ < 20151204
+#ifdef GLIBCXX_49X
 			/* workaround for g++ 4.x: no overload for
 			   rethrow_exception(exception_ptr) */
 			std::rethrow_if_nested(e);

src/db/Count.cxx

@@ -62,7 +62,7 @@ Print(Response &r, TagType group, const TagCountMap &m)
 	}
 }
 
-static bool
+static void
 stats_visitor_song(SearchStats &stats, const LightSong &song)
 {
 	stats.n_songs++;
@@ -70,8 +70,6 @@ stats_visitor_song(SearchStats &stats, const LightSong &song)
 	const auto duration = song.GetDuration();
 	if (!duration.IsNegative())
 		stats.total_duration += duration;
-
-	return true;
 }
 
 static bool
@@ -94,7 +92,7 @@ CollectGroupCounts(TagCountMap &map, TagType group, const Tag &tag)
 	return found;
 }
 
-static bool
+static void
 GroupCountVisitor(TagCountMap &map, TagType group, const LightSong &song)
 {
 	assert(song.tag != nullptr);
@@ -103,8 +101,6 @@ GroupCountVisitor(TagCountMap &map, TagType group, const LightSong &song)
 	if (!CollectGroupCounts(map, group, tag) && group == TAG_ALBUM_ARTIST)
 		/* fall back to "Artist" if no "AlbumArtist" was found */
 		CollectGroupCounts(map, TAG_ARTIST, tag);
-
-	return true;
 }
 
 void

src/db/DatabasePlaylist.cxx

@@ -27,13 +27,12 @@
 
 #include <functional>
 
-static bool
+static void
 AddSong(const Storage &storage, const char *playlist_path_utf8,
 	const LightSong &song)
 {
 	spl_append_song(playlist_path_utf8,
 			DatabaseDetachSong(storage, song));
-	return true;
 }
 
 void

src/db/DatabasePrint.cxx

@@ -49,16 +49,14 @@ PrintDirectoryURI(Response &r, bool base, const LightDirectory &directory)
 		 ApplyBaseFlag(directory.GetPath(), base));
 }
 
-static bool
+static void
 PrintDirectoryBrief(Response &r, bool base, const LightDirectory &directory)
 {
 	if (!directory.IsRoot())
 		PrintDirectoryURI(r, base, directory);
-
-	return true;
 }
 
-static bool
+static void
 PrintDirectoryFull(Response &r, bool base, const LightDirectory &directory)
 {
 	if (!directory.IsRoot()) {
@@ -67,8 +65,6 @@ PrintDirectoryFull(Response &r, bool base, const LightDirectory &directory)
 		if (directory.mtime > 0)
 			time_print(r, "Last-Modified", directory.mtime);
 	}
-
-	return true;
 }
 
 static void
@@ -96,7 +92,7 @@ print_playlist_in_directory(Response &r, bool base,
 			 directory->GetPath(), name_utf8);
 }
 
-static bool
+static void
 PrintSongBrief(Response &r, Partition &partition,
 	       bool base, const LightSong &song)
 {
@@ -106,11 +102,9 @@ PrintSongBrief(Response &r, Partition &partition,
 		/* this song file has an embedded CUE sheet */
 		print_playlist_in_directory(r, base,
 					    song.directory, song.uri);
-
-	return true;
 }
 
-static bool
+static void
 PrintSongFull(Response &r, Partition &partition,
 	      bool base, const LightSong &song)
 {
@@ -120,21 +114,18 @@ PrintSongFull(Response &r, Partition &partition,
 		/* this song file has an embedded CUE sheet */
 		print_playlist_in_directory(r, base,
 					    song.directory, song.uri);
-
-	return true;
 }
 
-static bool
+static void
 PrintPlaylistBrief(Response &r, bool base,
 		   const PlaylistInfo &playlist,
 		   const LightDirectory &directory)
 {
 	print_playlist_in_directory(r, base,
 				    &directory, playlist.name.c_str());
-	return true;
 }
 
-static bool
+static void
 PrintPlaylistFull(Response &r, bool base,
 		  const PlaylistInfo &playlist,
 		  const LightDirectory &directory)
@@ -144,8 +135,6 @@ PrintPlaylistFull(Response &r, bool base,
 
 	if (playlist.mtime > 0)
 		time_print(r, "Last-Modified", playlist.mtime);
-
-	return true;
 }
 
 void
@@ -191,15 +180,13 @@ db_selection_print(Response &r, Partition &partition,
 			   0, std::numeric_limits<int>::max());
 }
 
-static bool
+static void
 PrintSongURIVisitor(Response &r, Partition &partition, const LightSong &song)
 {
 	song_print_uri(r, partition, song);
-
-	return true;
 }
 
-static bool
+static void
 PrintUniqueTag(Response &r, TagType tag_type,
 	       const Tag &tag)
 {
@@ -211,8 +198,6 @@ PrintUniqueTag(Response &r, TagType tag_type,
 		if (item.type != tag_type)
 			r.Format("%s: %s\n",
 				 tag_item_names[item.type], item.value);
-
-	return true;
 }
 
 void

src/db/DatabaseQueue.cxx

@@ -27,14 +27,13 @@
 
 #include <functional>
 
-static bool
+static void
 AddToQueue(Partition &partition, const LightSong &song)
 {
 	const Storage &storage = *partition.instance.storage;
 	partition.playlist.AppendSong(partition.pc,
 				      DatabaseDetachSong(storage,
 							 song));
-	return true;
 }
 
 void

src/db/Helpers.cxx

@@ -67,15 +67,13 @@ StatsVisitTag(DatabaseStats &stats, StringSet &artists, StringSet &albums,
 	}
 }
 
-static bool
+static void
 StatsVisitSong(DatabaseStats &stats, StringSet &artists, StringSet &albums,
 	       const LightSong &song)
 {
 	++stats.song_count;
 
 	StatsVisitTag(stats, artists, albums, *song.tag);
-
-	return true;
 }
 
 DatabaseStats

src/db/plugins/simple/Mount.cxx

@@ -25,6 +25,13 @@
 #include "db/Interface.hxx"
 #include "fs/Traits.hxx"
 
+#ifdef _LIBCPP_VERSION
+/* workaround for "error: incomplete type 'PlaylistInfo' used in type
+   trait expression" with libc++ version 3900 (from Android NDK
+   r13b) */
+#include "db/PlaylistInfo.hxx"
+#endif
+
 #include <string>
 
 struct PrefixedLightDirectory : LightDirectory {

src/decoder/DecoderThread.cxx

@@ -235,7 +235,7 @@ decoder_run_stream_fallback(DecoderBridge &bridge, InputStream &is)
 {
 	const struct DecoderPlugin *plugin;
 
-#ifdef HAVE_FFMPEG
+#ifdef ENABLE_FFMPEG
 	plugin = decoder_plugin_from_name("ffmpeg");
 #else
 	plugin = decoder_plugin_from_name("mad");

src/decoder/plugins/MpcdecDecoderPlugin.cxx

@@ -207,6 +207,15 @@ mpcdec_decode(DecoderClient &client, InputStream &is)
 		if (frame.bits == -1)
 			break;
 
+		if (frame.samples <= 0) {
+			/* empty frame - this has been observed to
+			   happen spuriously after seeking; skip this
+			   obscure frame, and hope libmpcdec
+			   recovers */
+			cmd = client.GetCommand();
+			continue;
+		}
+
 		mpc_uint32_t ret = frame.samples;
 		ret *= info.channels;
 

src/decoder/plugins/SidplayDecoderPlugin.cxx

@@ -50,6 +50,10 @@
 #include <string.h>
 #include <stdio.h>
 
+#ifdef HAVE_SIDPLAYFP
+#define LIBSIDPLAYFP_VERSION GCC_MAKE_VERSION(LIBSIDPLAYFP_VERSION_MAJ, LIBSIDPLAYFP_VERSION_MIN, LIBSIDPLAYFP_VERSION_LEV)
+#endif
+
 #define SUBTUNE_PREFIX "tune_"
 
 static constexpr Domain sidplay_domain("sidplay");
@@ -285,7 +289,11 @@ sidplay_file_decode(DecoderClient &client, Path path_fs)
 #endif
 
 #ifdef HAVE_SIDPLAYFP
+#if LIBSIDPLAYFP_VERSION >= GCC_MAKE_VERSION(1,8,0)
 	const bool stereo = tune.getInfo()->sidChips() >= 2;
+#else
+	const bool stereo = tune.getInfo()->isStereo();
+#endif
 #else
 	const bool stereo = tune.isStereo();
 #endif

src/decoder/plugins/WavpackDecoderPlugin.cxx

@@ -34,6 +34,8 @@
 #include <stdexcept>
 #include <memory>
 
+#include <cstdlib>
+
 #include <assert.h>
 
 #define ERRORLEN 80

src/event/Call.cxx

@@ -79,7 +79,7 @@ private:
 void
 BlockingCall(EventLoop &loop, std::function<void()> &&f)
 {
-	if (loop.IsInside()) {
+	if (loop.IsInsideOrNull()) {
 		/* we're already inside the loop - we can simply call
 		   the function */
 		f();

src/event/Loop.cxx

@@ -222,8 +222,9 @@ EventLoop::Run()
 #ifndef NDEBUG
 	assert(busy);
 	assert(thread.IsInside());
-	thread = ThreadId::Null();
 #endif
+
+	thread = ThreadId::Null();
 }
 
 void

src/event/Loop.hxx

@@ -212,12 +212,16 @@ public:
 	}
 #endif
 
-#ifndef NDEBUG
+	/**
+	 * Like IsInside(), but also returns true if the thread has
+	 * already ended (or was not started yet).  This is useful for
+	 * code which may run during startup or shutdown, when events
+	 * are not yet/anymore handled.
+	 */
 	gcc_pure
 	bool IsInsideOrNull() const {
 		return thread.IsNull() || thread.IsInside();
 	}
-#endif
 };
 
 #endif /* MAIN_NOTIFY_H */

src/event/MultiSocketMonitor.cxx

@@ -28,12 +28,18 @@
 #endif
 
 MultiSocketMonitor::MultiSocketMonitor(EventLoop &_loop)
-	:IdleMonitor(_loop), TimeoutMonitor(_loop), ready(false) {
+	:IdleMonitor(_loop), TimeoutMonitor(_loop) {
 }
 
-MultiSocketMonitor::~MultiSocketMonitor()
+void
+MultiSocketMonitor::Reset()
 {
-	// TODO
+	assert(GetEventLoop().IsInsideOrNull());
+
+	fds.clear();
+	IdleMonitor::Cancel();
+	TimeoutMonitor::Cancel();
+	ready = refresh = false;
 }
 
 void

src/event/MultiSocketMonitor.hxx

@@ -96,7 +96,19 @@ class MultiSocketMonitor : IdleMonitor, TimeoutMonitor
 
 	friend class SingleFD;
 
-	bool ready, refresh;
+	/**
+	 * DispatchSockets() should be called.
+	 */
+	bool ready = false;
+
+	/**
+	 * PrepareSockets() should be called.
+	 *
+	 * Note that this doesn't need to be initialized by the
+	 * constructor; this class is activated with the first
+	 * InvalidateSockets() call, which initializes this flag.
+	 */
+	bool refresh;
 
 	std::forward_list<SingleFD> fds;
 
@@ -107,11 +119,26 @@ public:
 	static constexpr unsigned HANGUP = SocketMonitor::HANGUP;
 
 	MultiSocketMonitor(EventLoop &_loop);
-	~MultiSocketMonitor();
 
 	using IdleMonitor::GetEventLoop;
 
-public:
+	/**
+	 * Clear the socket list and disable all #EventLoop
+	 * registrations.  Run this in the #EventLoop thread before
+	 * destroying this object.
+	 *
+	 * Later, this object can be reused and reactivated by calling
+	 * InvalidateSockets().
+	 *
+	 * Note that this class doesn't have a destructor which calls
+	 * this method, because this would be racy and thus pointless:
+	 * at the time ~MultiSocketMonitor() is called, our virtual
+	 * methods have been morphed to be pure again, and in the
+	 * meantime the #EventLoop thread could invoke those pure
+	 * methods.
+	 */
+	void Reset();
+
 	/**
 	 * Invalidate the socket list.  A call to PrepareSockets() is
 	 * scheduled which will then update the list.
@@ -121,12 +148,19 @@ public:
 		IdleMonitor::Schedule();
 	}
 
+	/**
+	 * Add one socket to the list of monitored sockets.
+	 *
+	 * May only be called from PrepareSockets().
+	 */
 	void AddSocket(int fd, unsigned events) {
 		fds.emplace_front(*this, fd, events);
 	}
 
 	/**
 	 * Remove all sockets.
+	 *
+	 * May only be called from PrepareSockets().
 	 */
 	void ClearSocketList();
 
@@ -135,6 +169,8 @@ public:
 	 * each one; its return value is the events bit mask.  A
 	 * return value of 0 means the socket will be removed from the
 	 * list.
+	 *
+	 * May only be called from PrepareSockets().
 	 */
 	template<typename E>
 	void UpdateSocketList(E &&e) {
@@ -157,15 +193,26 @@ public:
 	/**
 	 * Replace the socket list with the given file descriptors.
 	 * The given pollfd array will be modified by this method.
+	 *
+	 * May only be called from PrepareSockets().
 	 */
 	void ReplaceSocketList(pollfd *pfds, unsigned n);
 #endif
 
 protected:
 	/**
+	 * Override this method and update the socket registrations.
+	 * To do that, call AddSocket(), ClearSocketList(),
+	 * UpdateSocketList() and ReplaceSocketList().
+	 *
 	 * @return timeout or a negative value for no timeout
 	 */
 	virtual std::chrono::steady_clock::duration PrepareSockets() = 0;
+
+	/**
+	 * At least one socket is ready or the timeout has expired.
+	 * This method should be used to perform I/O.
+	 */
 	virtual void DispatchSockets() = 0;
 
 private:

src/input/plugins/AlsaInputPlugin.cxx

@@ -98,12 +98,9 @@ public:
 	}
 
 	~AlsaInputStream() {
-		/* ClearSocketList must be called from within the
-		   IOThread; if we don't do it manually here, the
-		   ~MultiSocketMonitor() will do it in the current
-		   thread */
 		BlockingCall(MultiSocketMonitor::GetEventLoop(), [this](){
-				ClearSocketList();
+				MultiSocketMonitor::Reset();
+				DeferredMonitor::Cancel();
 			});
 
 		snd_pcm_close(capture_handle);
@@ -181,7 +178,7 @@ AlsaInputStream::PrepareSockets()
 	}
 
 	int count = snd_pcm_poll_descriptors_count(capture_handle);
-	if (count < 0) {
+	if (count <= 0) {
 		ClearSocketList();
 		return std::chrono::steady_clock::duration(-1);
 	}

src/input/plugins/CurlInputPlugin.cxx

@@ -398,7 +398,12 @@ CurlInputStream::SeekInternal(offset_type new_offset)
 	/* send the "Range" header */
 
 	if (offset > 0) {
-		sprintf(range, "%lld-", (long long)offset);
+#ifdef WIN32
+		// TODO: what can we use on Windows to format 64 bit?
+		sprintf(range, "%lu-", (long)offset);
+#else
+		sprintf(range, "%llu-", (unsigned long long)offset);
+#endif
 		request->SetOption(CURLOPT_RANGE, range);
 	}
 }

src/lib/curl/Request.cxx

@@ -168,13 +168,23 @@ CurlRequest::Done(CURLcode result)
 	}
 }
 
+gcc_pure
+static bool
+IsResponseBoundaryHeader(StringView s)
+{
+	return s.size > 5 && (memcmp(s.data, "HTTP/", 5) == 0 ||
+			      /* the proprietary "ICY 200 OK" is
+				 emitted by Shoutcast */
+			      memcmp(s.data, "ICY 2", 5) == 0);
+}
+
 inline void
 CurlRequest::HeaderFunction(StringView s)
 {
 	if (state > State::HEADERS)
 		return;
 
-	if (s.size > 5 && memcmp(s.data, "HTTP/", 5) == 0) {
+	if (IsResponseBoundaryHeader(s)) {
 		/* this is the boundary to a new response, for example
 		   after a redirect */
 		headers.clear();

src/lib/nfs/Connection.cxx

@@ -396,6 +396,17 @@ NfsConnection::ScheduleSocket()
 	assert(GetEventLoop().IsInside());
 	assert(context != nullptr);
 
+	const int which_events = nfs_which_events(context);
+
+	if (which_events == POLLOUT && SocketMonitor::IsDefined())
+		/* kludge: if libnfs asks only for POLLOUT, it means
+		   that it is currently waiting for the connect() to
+		   finish - rpc_reconnect_requeue() may have been
+		   called from inside nfs_service(); we must now
+		   unregister the old socket and register the new one
+		   instead */
+		SocketMonitor::Steal();
+
 	if (!SocketMonitor::IsDefined()) {
 		int _fd = nfs_get_fd(context);
 		if (_fd < 0)
@@ -405,7 +416,8 @@ NfsConnection::ScheduleSocket()
 		SocketMonitor::Open(_fd);
 	}
 
-	SocketMonitor::Schedule(libnfs_to_events(nfs_which_events(context)));
+	SocketMonitor::Schedule(libnfs_to_events(which_events)
+				| SocketMonitor::HANGUP);
 }
 
 inline int
@@ -442,10 +454,14 @@ NfsConnection::OnSocketReady(unsigned flags)
 	bool closed = false;
 
 	const bool was_mounted = mount_finished;
-	if (!mount_finished)
+	if (!mount_finished || (flags & SocketMonitor::HANGUP) != 0)
 		/* until the mount is finished, the NFS client may use
 		   various sockets, therefore we unregister and
 		   re-register it each time */
+		/* also re-register the socket if we got a HANGUP,
+		   which is a sure sign that libnfs will close the
+		   socket, which can lead to a race condition if
+		   epoll_ctl() is called later */
 		SocketMonitor::Steal();
 
 	const int result = Service(flags);

src/mixer/plugins/AlsaMixerPlugin.cxx

@@ -23,6 +23,7 @@
 #include "output/OutputAPI.hxx"
 #include "event/MultiSocketMonitor.hxx"
 #include "event/DeferredMonitor.hxx"
+#include "event/Call.hxx"
 #include "util/ASCII.hxx"
 #include "util/ReusableArray.hxx"
 #include "util/Domain.hxx"
@@ -53,6 +54,13 @@ public:
 		DeferredMonitor::Schedule();
 	}
 
+	~AlsaMixerMonitor() {
+		BlockingCall(MultiSocketMonitor::GetEventLoop(), [this](){
+				MultiSocketMonitor::Reset();
+				DeferredMonitor::Cancel();
+			});
+	}
+
 private:
 	virtual void RunDeferred() override {
 		InvalidateSockets();
@@ -102,7 +110,7 @@ AlsaMixerMonitor::PrepareSockets()
 	}
 
 	int count = snd_mixer_poll_descriptors_count(mixer);
-	if (count < 0)
+	if (count <= 0)
 		count = 0;
 
 	struct pollfd *pfds = pfd_buffer.Get(count);

src/output/plugins/SndioOutputPlugin.cxx

@@ -24,8 +24,16 @@
 #include "util/Domain.hxx"
 #include "Log.hxx"
 
+/* work around a C++ incompatibility if the sndio API is emulated by
+   libroar: libroar's "struct roar_service_stream" has a member named
+   "new", which is an illegal identifier in C++ */
+#define new new_
+
 #include <sndio.h>
 
+/* undo the libroar workaround */
+#undef new
+
 #include <stdexcept>
 
 #ifndef SIO_DEVANY

src/output/plugins/httpd/IcyMetaDataServer.cxx

@@ -60,7 +60,11 @@ icy_server_metadata_string(const char *stream_title, const char* stream_url)
 {
 	// The leading n is a placeholder for the length information
 	auto icy_metadata = FormatString("nStreamTitle='%s';"
-					 "StreamUrl='%s';",
+					 "StreamUrl='%s';"
+					 /* pad 15 spaces just in case
+					    the length needs to be
+					    rounded up */
+					 "               ",
 					 stream_title,
 					 stream_url);
 
@@ -68,7 +72,7 @@ icy_server_metadata_string(const char *stream_title, const char* stream_url)
 
 	meta_length--; // subtract placeholder
 
-	meta_length = ((int)meta_length / 16) + 1;
+	meta_length = meta_length / 16;
 
 	icy_metadata[0] = meta_length;
 
@@ -109,5 +113,5 @@ icy_server_metadata_page(const Tag &tag, const TagType *types)
 	if (icy_string.IsNull())
 		return nullptr;
 
-	return Page::Copy(icy_string.c_str(), (icy_string[0] * 16) + 1);
+	return Page::Copy(icy_string.c_str(), uint8_t(icy_string[0]) * 16 + 1);
 }

src/pcm/SampleFormat.hxx

@@ -64,7 +64,10 @@ enum class SampleFormat : uint8_t {
 /**
  * Checks whether the sample format is valid.
  */
-static constexpr inline bool
+#if !GCC_OLDER_THAN(5,0)
+constexpr
+#endif
+static inline bool
 audio_valid_sample_format(SampleFormat format)
 {
 	switch (format) {
@@ -83,7 +86,10 @@ audio_valid_sample_format(SampleFormat format)
 	return false;
 }
 
-static constexpr inline unsigned
+#if !GCC_OLDER_THAN(5,0)
+constexpr
+#endif
+static inline unsigned
 sample_format_size(SampleFormat format)
 {
 	switch (format) {

src/tag/TagHandler.cxx

@@ -44,7 +44,7 @@ add_tag_tag(TagType type, const char *value, void *ctx)
 		unsigned n = strtoul(value, &end, 10);
 		if (value != end) {
 			char s[21];
-			if (snprintf(s, 21, "%u", n) >= 0)
+			if (snprintf(s, 21, "%u", n) > 0)
 				tag.AddItem(type, s);
 		}
 	} else

src/tag/TagId3.cxx

@@ -24,6 +24,7 @@
 #include "TagTable.hxx"
 #include "TagBuilder.hxx"
 #include "util/Alloc.hxx"
+#include "util/ScopeExit.hxx"
 #include "util/StringUtil.hxx"
 #include "Log.hxx"
 
@@ -78,11 +79,9 @@ import_id3_string(const id3_ucs4_t *ucs4)
 	if (gcc_unlikely(utf8 == nullptr))
 		return nullptr;
 
-	id3_utf8_t *utf8_stripped = (id3_utf8_t *)
-		xstrdup(Strip((char *)utf8));
-	free(utf8);
+	AtScopeExit(utf8) { free(utf8); };
 
-	return utf8_stripped;
+	return (id3_utf8_t *)xstrdup(Strip((char *)utf8));
 }
 
 /**
@@ -126,9 +125,10 @@ tag_id3_import_text_frame(const struct id3_frame *frame,
 		if (utf8 == nullptr)
 			continue;
 
+		AtScopeExit(utf8) { free(utf8); };
+
 		tag_handler_invoke_tag(handler, handler_ctx,
 				       type, (const char *)utf8);
-		free(utf8);
 	}
 }
 
@@ -177,8 +177,9 @@ tag_id3_import_comment_frame(const struct id3_frame *frame, TagType type,
 	if (utf8 == nullptr)
 		return;
 
+	AtScopeExit(utf8) { free(utf8); };
+
 	tag_handler_invoke_tag(handler, handler_ctx, type, (const char *)utf8);
-	free(utf8);
 }
 
 /**
@@ -236,22 +237,23 @@ tag_id3_import_musicbrainz(struct id3_tag *id3_tag,
 		if (name == nullptr)
 			continue;
 
+		AtScopeExit(name) { free(name); };
+
 		id3_utf8_t *value = tag_id3_getstring(frame, 2);
 		if (value == nullptr)
 			continue;
 
+		AtScopeExit(value) { free(value); };
+
 		tag_handler_invoke_pair(handler, handler_ctx,
 					(const char *)name,
 					(const char *)value);
 
 		TagType type = tag_id3_parse_txxx_name((const char*)name);
-		free(name);
 
 		if (type != TAG_NUM_OF_ITEM_TYPES)
 			tag_handler_invoke_tag(handler, handler_ctx,
 					       type, (const char*)value);
-
-		free(value);
 	}
 }
 

src/util/HugeAllocator.cxx

@@ -48,7 +48,7 @@ static size_t
 AlignToPageSize(size_t size)
 {
 	static const long page_size = sysconf(_SC_PAGESIZE);
-	if (page_size == 0)
+	if (page_size <= 0)
 		return size;
 
 	size_t ps(page_size);

src/util/ReusableArray.hxx

@@ -56,7 +56,7 @@ public:
 		:buffer(std::exchange(src.buffer, nullptr)),
 		 capacity(std::exchange(src.capacity, 0)) {}
 
-	ReusableArray &operator=(const ReusableArray &&src) {
+	ReusableArray &operator=(ReusableArray &&src) {
 		std::swap(buffer, src.buffer);
 		std::swap(capacity, src.capacity);
 		return *this;

src/util/TimeParser.cxx

@@ -60,6 +60,8 @@ ParseTimePoint(const char *s, const char *format)
 
 #ifdef WIN32
 	/* TODO: emulate strptime()? */
+	(void)s;
+	(void)format;
 	throw std::runtime_error("Time parsing not implemented on Windows");
 #else
 	struct tm tm;

src/util/VarSize.hxx

@@ -36,6 +36,7 @@
 #include <type_traits>
 #include <utility>
 #include <new>
+#include <cstdlib>
 
 /**
  * Allocate and construct a variable-size object.  That is useful for

win32/build.py

@@ -5,11 +5,22 @@ import sys, subprocess
 
 configure_args = sys.argv[1:]
 
-host_arch = 'i686-w64-mingw32'
+x64 = True
 
-if len(configure_args) > 0 and configure_args[0] == '--64':
-    configure_args = configure_args[1:]
+while len(configure_args) > 0:
+    arg = configure_args[0]
+    if arg == '--64':
+        x64 = True
+    elif arg == '--32':
+        x64 = False
+    else:
+        break
+    configure_args.pop(0)
+
+if x64:
     host_arch = 'x86_64-w64-mingw32'
+else:
+    host_arch = 'i686-w64-mingw32'
 
 # the path to the MPD sources
 mpd_path = os.path.abspath(os.path.join(os.path.dirname(sys.argv[0]) or '.', '..'))