audio-parser, output_thread: work around -Wmaybe-uninitialized

src/audio_parser.c

@@ -26,6 +26,7 @@
 #include "audio_parser.h"
 #include "audio_format.h"
 #include "audio_check.h"
+#include "gcc.h"
 
 #include <assert.h>
 #include <string.h>
@@ -160,6 +161,11 @@ audio_format_parse(struct audio_format *dest, const char *src,
 
 	/* parse sample rate */
 
+#if GCC_CHECK_VERSION(4,7)
+	/* workaround -Wmaybe-uninitialized false positive */
+	rate = 0;
+#endif
+
 	if (!parse_sample_rate(src, mask, &rate, &src, error_r))
 		return false;
 
@@ -171,6 +177,11 @@ audio_format_parse(struct audio_format *dest, const char *src,
 
 	/* parse sample format */
 
+#if GCC_CHECK_VERSION(4,7)
+	/* workaround -Wmaybe-uninitialized false positive */
+	sample_format = SAMPLE_FORMAT_UNDEFINED;
+#endif
+
 	if (!parse_sample_format(src, mask, &sample_format, &src, error_r))
 		return false;
 

src/output_thread.c

@@ -29,6 +29,7 @@
 #include "filter/convert_filter_plugin.h"
 #include "filter/replay_gain_filter_plugin.h"
 #include "mpd_error.h"
+#include "gcc.h"
 
 #include <glib.h>
 
@@ -438,6 +439,10 @@ ao_play_chunk(struct audio_output *ao, const struct music_chunk *chunk)
 	}
 
 	size_t size;
+#if GCC_CHECK_VERSION(4,7)
+	/* workaround -Wmaybe-uninitialized false positive */
+	size = 0;
+#endif
 	const char *data = ao_filter_chunk(ao, chunk, &size);
 	if (data == NULL) {
 		ao_close(ao, false);