[FFmpeg-devel] [PATCHv2] avutil/attributes: extend av_uninit to clang

[Ganesh Ajjanagadde]

Commit 6dac8c8327 disabled av_uninit for clang, due to some useless warnings.
The concept of av_uninit is inherently useful though. This patch silences a
bunch of warnings on clang e.g
http://fate.ffmpeg.org/log.cgi?time=20150918181527&log=compile&slot=x86_64-darwin-clang-polly-vectorize-stripmine-3.7.
Furthermore, it should be useful for general usage of av_uninit in future.

Signed-off-by: Ganesh Ajjanagadde <gajjanagadde at gmail.com>
---
 libavutil/attributes.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/libavutil/attributes.h b/libavutil/attributes.h
index 5c6b9de..32b60e7 100644
--- a/libavutil/attributes.h
+++ b/libavutil/attributes.h
@@ -147,6 +147,12 @@
 
 #if defined(__GNUC__) && !defined(__INTEL_COMPILER) && !defined(__clang__)
 #    define av_uninit(x) x=x
+#elif defined(__clang__) && __has_warning("-Wuninitialized")
+#    define av_uninit(x) \
+        _Pragma("clang diagnostic push") \
+        _Pragma("clang diagnostic ignored \"-Wuninitialized\"") \
+        x=x \
+        _Pragma("clang diagnostic pop")
 #else
 #    define av_uninit(x) x
 #endif
-- 
2.1.4