test: add GLib testing compatibility header

Didn't compile on GLib < 2.16.

Makefile.am

@@ -1195,6 +1195,7 @@ test_run_inotify_LDADD = $(GLIB_LIBS)
 endif
 
 test_test_pcm_SOURCES = \
+	test/test_glib_compat.h \
 	test/test_pcm_dither.c \
 	test/test_pcm_pack.c \
 	test/test_pcm_channels.c \

test/test_glib_compat.h

@@ -0,0 +1,57 @@
+/*
+ * Copyright (C) 2003-2011 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.
+ */
+
+/*
+ * Compatibility header for GLib before 2.16.
+ */
+
+#ifndef MPD_TEST_GLIB_COMPAT_H
+#define MPD_TEST_GLIB_COMPAT_H
+
+#include <glib.h>
+
+#if !GLIB_CHECK_VERSION(2,16,0)
+
+#define g_assert_cmpint(n1, cmp, n2) g_assert((n1) cmp (n2))
+
+static void (*test_functions[256])(void);
+static unsigned num_test_functions;
+
+static inline void
+g_test_init(G_GNUC_UNUSED int *argc, G_GNUC_UNUSED char ***argv, ...)
+{
+}
+
+static inline void
+g_test_add_func(G_GNUC_UNUSED const char *testpath, void (test_funcvoid)(void))
+{
+	test_functions[num_test_functions++] = test_funcvoid;
+}
+
+static inline int
+g_test_run(void)
+{
+	for (unsigned i = 0; i < num_test_functions; ++i)
+		test_functions[i]();
+	return 0;
+}
+
+#endif /* !2.16 */
+
+#endif

test/test_pcm_byteswap.c

@@ -20,6 +20,7 @@
 #include "test_pcm_all.h"
 #include "pcm_byteswap.h"
 #include "pcm_buffer.h"
+#include "test_glib_compat.h"
 
 #include <glib.h>
 

test/test_pcm_channels.c

@@ -18,6 +18,7 @@
  */
 
 #include "test_pcm_all.h"
+#include "test_glib_compat.h"
 #include "pcm_channels.h"
 #include "pcm_buffer.h"
 

test/test_pcm_dither.c

@@ -18,6 +18,7 @@
  */
 
 #include "test_pcm_all.h"
+#include "test_glib_compat.h"
 #include "pcm_dither.h"
 
 #include <glib.h>

test/test_pcm_main.c

@@ -18,6 +18,7 @@
  */
 
 #include "test_pcm_all.h"
+#include "test_glib_compat.h"
 
 #include <glib.h>
 

test/test_pcm_pack.c

@@ -19,6 +19,7 @@
 
 #include "test_pcm_all.h"
 #include "pcm_pack.h"
+#include "test_glib_compat.h"
 
 #include <glib.h>