[FFmpeg-trac] #4366(undetermined:new): Error building libavutil on Mac OS X 10.9.5 and clang 6.0

[FFmpeg]

#4366: Error building libavutil on Mac OS X 10.9.5 and clang 6.0
-------------------------------------+-------------------------------------
             Reporter:  mario_grgic  |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 I have been successfully building ffmpeg on Mac OS X for years now,
 including version 2.5.2 that I built last.

 But when I attempted latest ffmpeg-2.6 I run into error in
 libavutil/opencl.c:



 {{{
 libavutil/opencl.c:42:44: note: expanded from macro 'UNLOCK_OPENCL'
 #define UNLOCK_OPENCL pthread_mutex_unlock(atomic_opencl_lock)
                                            ^~~~~~~~~~~~~~~~~~
 /usr/include/pthread.h:363:43: note: passing argument to parameter here
 int pthread_mutex_unlock(pthread_mutex_t *);
                                           ^
 libavutil/opencl.c:592:5: warning: passing 'volatile pthread_mutex_t *'
       (aka 'volatile struct _opaque_pthread_mutex_t *') to parameter of
 type 'pthread_mutex_t *' (aka
       'struct _opaque_pthread_mutex_t *') discards qualifiers
 [-Wincompatible-pointer-types-discards-qualifiers]
     LOCK_OPENCL;
     ^~~~~~~~~~~
 libavutil/opencl.c:41:40: note: expanded from macro 'LOCK_OPENCL'
 #define LOCK_OPENCL pthread_mutex_lock(atomic_opencl_lock)
                                        ^~~~~~~~~~~~~~~~~~
 /usr/include/pthread.h:353:41: note: passing argument to parameter here
 int pthread_mutex_lock(pthread_mutex_t *);
                                         ^
 libavutil/opencl.c:614:10: error: use of undeclared identifier 'i'
     for (i = 0; i < opencl_ctx.kernel_code_count; i++) {
          ^
 libavutil/opencl.c:614:17: error: use of undeclared identifier 'i'
     for (i = 0; i < opencl_ctx.kernel_code_count; i++) {
                 ^
 libavutil/opencl.c:614:51: error: use of undeclared identifier 'i'
     for (i = 0; i < opencl_ctx.kernel_code_count; i++) {
                                                   ^
 libavutil/opencl.c:615:32: error: use of undeclared identifier 'i'
         opencl_ctx.kernel_code[i].is_compiled = 0;
                                ^
 libavutil/opencl.c:621:5: warning: passing 'volatile pthread_mutex_t *'
       (aka 'volatile struct _opaque_pthread_mutex_t *') to parameter of
 type 'pthread_mutex_t *' (aka
       'struct _opaque_pthread_mutex_t *') discards qualifiers
 [-Wincompatible-pointer-types-discards-qualifiers]
     UNLOCK_OPENCL;
     ^~~~~~~~~~~~~
 }}}


 This is with

 $ clang --version
 Apple LLVM version 6.0 (clang-600.0.54) (based on LLVM 3.5svn)
 Target: x86_64-apple-darwin13.4.0
 Thread model: posix

 on Mac OS X 10.9.5

 ffmpeg was configured as follows

 ./configure --prefix=/Volumes/ramdisk/ffmpeg --as=yasm --disable-shared
 --enable-static --disable-ffplay --disable-ffserver --enable-gpl --enable-
 pthreads --enable-postproc --enable-gray --enable-libfaac --enable-
 libmp3lame --enable-libtheora --enable-libvorbis --enable-libx264
 --enable-libxvid --enable-libspeex --enable-bzlib --enable-zlib --enable-
 libopencore-amrnb --enable-libopencore-amrwb --enable-nonfree --enable-
 version3 --enable-runtime-cpudetect --enable-libvo-aacenc --enable-libvo-
 amrwbenc --enable-avresample --enable-opengl --enable-opencl
 --datadir=/usr/share/ffmpeg --mandir=/usr/share/man

--
Ticket URL: <https://trac.ffmpeg.org/ticket/4366>
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