configure.ac: add option "--disable-glib"

Allows building without GLib.  This fails to compile currently,
because GLib is still used in the MPD core.

Makefile.am

@@ -990,14 +990,6 @@ libplaylist_plugins_a_SOURCES = \
 	src/playlist/ExtM3uPlaylistPlugin.hxx \
 	src/playlist/M3uPlaylistPlugin.cxx \
 	src/playlist/M3uPlaylistPlugin.hxx \
-	src/playlist/PlsPlaylistPlugin.cxx \
-	src/playlist/PlsPlaylistPlugin.hxx \
-	src/playlist/XspfPlaylistPlugin.cxx \
-	src/playlist/XspfPlaylistPlugin.hxx \
-	src/playlist/AsxPlaylistPlugin.cxx \
-	src/playlist/AsxPlaylistPlugin.hxx \
-	src/playlist/RssPlaylistPlugin.cxx \
-	src/playlist/RssPlaylistPlugin.hxx \
 	src/playlist/CuePlaylistPlugin.cxx \
 	src/playlist/CuePlaylistPlugin.hxx \
 	src/playlist/EmbeddedCuePlaylistPlugin.cxx \
@@ -1024,6 +1016,18 @@ libplaylist_plugins_a_SOURCES += \
 PLAYLIST_LIBS += $(YAJL_LIBS)
 endif
 
+if HAVE_GLIB
+libplaylist_plugins_a_SOURCES += \
+	src/playlist/PlsPlaylistPlugin.cxx \
+	src/playlist/PlsPlaylistPlugin.hxx \
+	src/playlist/XspfPlaylistPlugin.cxx \
+	src/playlist/XspfPlaylistPlugin.hxx \
+	src/playlist/AsxPlaylistPlugin.cxx \
+	src/playlist/AsxPlaylistPlugin.hxx \
+	src/playlist/RssPlaylistPlugin.cxx \
+	src/playlist/RssPlaylistPlugin.hxx
+endif
+
 #
 # Filter plugins
 #

configure.ac

@@ -547,13 +547,24 @@ AC_ARG_WITH(tremor-includes,
 dnl ---------------------------------------------------------------------------
 dnl Mandatory Libraries
 dnl ---------------------------------------------------------------------------
-PKG_CHECK_MODULES([GLIB], [glib-2.0 >= 2.28 gthread-2.0],,
+
+AC_ARG_ENABLE(glib,
+	AS_HELP_STRING([--enable-glib],
+		[enable GLib usage (default: enabled)]),,
+	enable_glib=yes)
+
+if test x$enable_glib = xyes; then
+	PKG_CHECK_MODULES([GLIB], [glib-2.0 >= 2.28 gthread-2.0],,
 		[AC_MSG_ERROR([GLib 2.28 is required])])
 
-if test x$GCC = xyes; then
-	# suppress warnings in the GLib headers
-	GLIB_CFLAGS=`echo $GLIB_CFLAGS |sed -e 's,-I/,-isystem /,g'`
+	if test x$GCC = xyes; then
+		# suppress warnings in the GLib headers
+		GLIB_CFLAGS=`echo $GLIB_CFLAGS |sed -e 's,-I/,-isystem /,g'`
+	fi
+
+	AC_DEFINE(HAVE_GLIB, 1, [Define if GLib is used])
 fi
+AM_CONDITIONAL(HAVE_GLIB, test x$enable_glib = xyes)
 
 dnl ---------------------------------------------------------------------------
 dnl Protocol Options

src/LogBackend.cxx

@@ -23,18 +23,24 @@
 #include "util/Domain.hxx"
 #include "util/CharUtil.hxx"
 
+#ifdef HAVE_GLIB
 #include <glib.h>
+#endif
 
 #include <assert.h>
 #include <stdio.h>
 #include <string.h>
+#include <time.h>
 
 #ifdef HAVE_SYSLOG
 #include <syslog.h>
 #endif
 
 static LogLevel log_threshold = LogLevel::INFO;
+
+#ifdef HAVE_GLIB
 static const char *log_charset;
+#endif
 
 static bool enable_timestamp;
 
@@ -48,12 +54,16 @@ SetLogThreshold(LogLevel _threshold)
 	log_threshold = _threshold;
 }
 
+#ifdef HAVE_GLIB
+
 void
 SetLogCharset(const char *_charset)
 {
 	log_charset = _charset;
 }
 
+#endif
+
 void
 EnableLogTimestamp()
 {
@@ -142,6 +152,7 @@ LogFinishSysLog()
 static void
 FileLog(const Domain &domain, const char *message)
 {
+#ifdef HAVE_GLIB
 	char *converted;
 
 	if (log_charset != nullptr) {
@@ -153,13 +164,16 @@ FileLog(const Domain &domain, const char *message)
 			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);
+#endif
 }
 
 void

src/LogInit.cxx

@@ -31,13 +31,16 @@
 #include "util/Domain.hxx"
 #include "system/FatalError.hxx"
 
+#ifdef HAVE_GLIB
+#include <glib.h>
+#endif
+
 #include <assert.h>
 #include <string.h>
 #include <fcntl.h>
 #include <stdio.h>
 #include <time.h>
 #include <unistd.h>
-#include <glib.h>
 
 #define LOG_LEVEL_SECURE LogLevel::INFO
 
@@ -110,9 +113,11 @@ log_init(bool verbose, bool use_stdout, Error &error)
 {
 	const struct config_param *param;
 
+#ifdef HAVE_GLIB
 	const char *charset;
 	g_get_charset(&charset);
 	SetLogCharset(charset);
+#endif
 
 	if (verbose)
 		SetLogThreshold(LogLevel::DEBUG);

src/Main.cxx

@@ -79,7 +79,9 @@
 #include "ArchiveList.hxx"
 #endif
 
+#ifdef HAVE_GLIB
 #include <glib.h>
+#endif
 
 #include <stdlib.h>
 
@@ -92,6 +94,8 @@
 #include <ws2tcpip.h>
 #endif
 
+#include <limits.h>
+
 static constexpr unsigned DEFAULT_BUFFER_SIZE = 4096;
 static constexpr unsigned DEFAULT_BUFFER_BEFORE_PLAY = 10;
 
@@ -359,11 +363,13 @@ int mpd_main(int argc, char *argv[])
 	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
 #endif
 
 	winsock_init();
@@ -473,7 +479,7 @@ int mpd_main(int argc, char *argv[])
 	}
 
 	if (!glue_state_file_init(error)) {
-		g_printerr("%s\n", error.GetMessage());
+		LogError(error);
 		return EXIT_FAILURE;
 	}
 

src/event/SignalMonitor.cxx

@@ -40,6 +40,7 @@
 #include <algorithm>
 
 #include <assert.h>
+#include <signal.h>
 
 class SignalMonitor final : private SocketMonitor {
 #ifdef USE_SIGNALFD

src/system/FatalError.cxx

@@ -23,7 +23,7 @@
 #include "util/Domain.hxx"
 #include "LogV.hxx"
 
-#ifdef WIN32
+#ifdef HAVE_GLIB
 #include <glib.h>
 #endif
 
@@ -78,12 +78,16 @@ FatalError(const char *msg, const Error &error)
 	FormatFatalError("%s: %s", msg, error.GetMessage());
 }
 
+#ifdef HAVE_GLIB
+
 void
 FatalError(const char *msg, GError *error)
 {
 	FormatFatalError("%s: %s", msg, error->message);
 }
 
+#endif
+
 void
 FatalSystemError(const char *msg)
 {

src/system/FatalError.hxx

@@ -45,9 +45,11 @@ gcc_noreturn
 void
 FatalError(const char *msg, const Error &error);
 
+#ifdef HAVE_GLIB
 gcc_noreturn
 void
 FatalError(const char *msg, GError *error);
+#endif
 
 /**
  * Call this after a system call has failed that is not supposed to

test/run_decoder.cxx

@@ -29,7 +29,9 @@
 #include "Log.hxx"
 #include "stdbin.h"
 
+#ifdef HAVE_GLIB
 #include <glib.h>
+#endif
 
 #include <assert.h>
 #include <unistd.h>
@@ -192,8 +194,10 @@ int main(int argc, char **argv)
 	decoder_name = argv[1];
 	decoder.uri = argv[2];
 
+#ifdef HAVE_GLIB
 #if !GLIB_CHECK_VERSION(2,32,0)
 	g_thread_init(NULL);
+#endif
 #endif
 
 	g_log_set_default_handler(my_log_func, NULL);

test/run_input.cxx

@@ -33,7 +33,9 @@
 #include "ArchiveList.hxx"
 #endif
 
+#ifdef HAVE_GLIB
 #include <glib.h>
+#endif
 
 #include <unistd.h>
 #include <stdlib.h>
@@ -120,8 +122,10 @@ int main(int argc, char **argv)
 
 	/* initialize GLib */
 
+#ifdef HAVE_GLIB
 #if !GLIB_CHECK_VERSION(2,32,0)
 	g_thread_init(NULL);
+#endif
 #endif
 
 	g_log_set_default_handler(my_log_func, NULL);