configure.ac: require GLib 2.16

Accidently, MPD has been using several GLib 2.16 functions for a
while, and nobody noticed yet.  To simplify the code base, let's bump
the minimum GLib version for MPD to 2.16.  That version is old enough,
and it's reasonable to expect users to have it.

INSTALL

@@ -13,7 +13,7 @@ Dependencies
 gcc - http://gcc.gnu.org/
 Any other C99 compliant compiler should also work.
 
-glib - http://www.gtk.org/
+GLib 2.16 - http://www.gtk.org/
 General-purpose utility library.
 
 

NEWS

@@ -41,6 +41,7 @@ ver 0.16 (20??/??/??)
 * state_file: save only if something has changed
 * obey $(sysconfdir) for default mpd.conf location
 * build with large file support by default
+* require GLib 2.16
 
 
 ver 0.15.5 (2009/??/??)

configure.ac

@@ -128,8 +128,8 @@ dnl
 dnl mandatory libraries
 dnl
 
-PKG_CHECK_MODULES([GLIB], [glib-2.0 >= 2.6 gthread-2.0],,
-		[AC_MSG_ERROR([glib-2.6 is required])])
+PKG_CHECK_MODULES([GLIB], [glib-2.0 >= 2.16 gthread-2.0],,
+		[AC_MSG_ERROR([glib-2.16 is required])])
 
 
 dnl

src/cmdline.c

@@ -77,10 +77,8 @@ static void version(void)
 	exit(EXIT_SUCCESS);
 }
 
-#if GLIB_CHECK_VERSION(2,12,0)
 static const char *summary =
 	"Music Player Daemon - a daemon for playing music.";
-#endif
 
 bool
 parse_cmdline(int argc, char **argv, struct options *options,
@@ -118,9 +116,7 @@ parse_cmdline(int argc, char **argv, struct options *options,
 	context = g_option_context_new("[path/to/mpd.conf]");
 	g_option_context_add_main_entries(context, entries, NULL);
 
-#if GLIB_CHECK_VERSION(2,12,0)
 	g_option_context_set_summary(context, summary);
-#endif
 
 	ret = g_option_context_parse(context, &argc, &argv, &error);
 	g_option_context_free(context);

src/input/curl_input_plugin.c

@@ -150,11 +150,6 @@ buffer_free_callback(gpointer data, G_GNUC_UNUSED gpointer user_data)
 	g_free(data);
 }
 
-/* g_queue_clear() was introduced in GLib 2.14 */
-#if !GLIB_CHECK_VERSION(2,14,0)
-#define g_queue_clear(q) do { g_queue_free(q); q = g_queue_new(); } while (0)
-#endif
-
 /**
  * Frees the current "libcurl easy" handle, and everything associated
  * with it.

src/input/lastfm_input_plugin.c

@@ -55,18 +55,12 @@ lastfm_input_init(const struct config_param *param)
 	if (passwd == NULL || user == NULL)
 		return false;
 
-#if GLIB_CHECK_VERSION(2,16,0)
 	lastfm_data.user = g_uri_escape_string(user, NULL, false);
-#else
-	lastfm_data.user = g_strdup(user);
-#endif
 
-#if GLIB_CHECK_VERSION(2,16,0)
 	if (strlen(passwd) != 32)
 		lastfm_data.md5 = g_compute_checksum_for_string(G_CHECKSUM_MD5,
 						    passwd, strlen(passwd));
 	else
-#endif
 		lastfm_data.md5 = g_strdup(passwd);
 
 	return true;
@@ -364,23 +358,16 @@ lastfm_input_open(struct input_stream *is, const char *url)
 		return false;
 	}
 
-#if GLIB_CHECK_VERSION(2,16,0)
 	q = g_uri_escape_string(session, NULL, false);
 	g_free(session);
 	session = q;
-#endif
 
 	/* "adjust" last.fm radio */
 
 	if (strlen(url) > 9) {
 		char *escaped_url;
 
-#if GLIB_CHECK_VERSION(2,16,0)
 		escaped_url = g_uri_escape_string(url, NULL, false);
-#else
-		escaped_url = g_strdup(url);
-#endif
-
 		p = g_strconcat("http://ws.audioscrobbler.com/radio/adjust.php?"
 				"session=", session, "&url=", escaped_url, "&debug=0",
 				NULL);

src/main.c

@@ -108,10 +108,8 @@ glue_mapper_init(void)
 	const char *music_dir, *playlist_dir;
 
 	music_dir = config_get_path(CONF_MUSIC_DIR);
-#if GLIB_CHECK_VERSION(2,14,0)
 	if (music_dir == NULL)
 		music_dir = g_get_user_special_dir(G_USER_DIRECTORY_MUSIC);
-#endif
 
 	playlist_dir = config_get_path(CONF_PLAYLIST_DIR);
 

src/output/httpd_client.c

@@ -482,11 +482,6 @@ httpd_client_queue_size(const struct httpd_client *client)
 	return size;
 }
 
-/* g_queue_clear() was introduced in GLib 2.14 */
-#if !GLIB_CHECK_VERSION(2,14,0)
-#define g_queue_clear(q) do { g_queue_free(q); q = g_queue_new(); } while (0)
-#endif
-
 void
 httpd_client_cancel(struct httpd_client *client)
 {