[FFmpeg-cvslog] avutil/utils: check that size_t is unsigned

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michaelni at gmx.at> | Sat Oct 26 22:08:06 2013 +0200| [f3d0642d35faf43ce027607bb117142b347ee1a4] | committer: Michael Niedermayer

avutil/utils: check that size_t is unsigned

ANSI/ISO C guarantee this, yet there is evidence that there exist
platforms where its not so.
See: http://www.cs.utah.edu/dept/old/texinfo/glibc-manual-0.02/library_30.html

Signed-off-by: Michael Niedermayer <michaelni at gmx.at>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=f3d0642d35faf43ce027607bb117142b347ee1a4
---

 libavutil/utils.c |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/libavutil/utils.c b/libavutil/utils.c
index eb87c90..dc84162 100644
--- a/libavutil/utils.c
+++ b/libavutil/utils.c
@@ -40,6 +40,8 @@ unsigned avutil_version(void)
     av_assert0(LIBAVUTIL_VERSION_MICRO >= 100);
     av_assert0(HAVE_MMX2 == HAVE_MMXEXT);
 
+    av_assert0(((size_t)-1) > 0); // C gurantees this but if false on a platform we care about revert at least b284e1ffe343d6697fb950d1ee517bafda8a9844
+
     if (av_sat_dadd32(1, 2) != 5) {
         av_log(NULL, AV_LOG_FATAL, "Libavutil has been build with a broken binutils, please upgrade binutils and rebuild\n");
         abort();