[FFmpeg-trac] #4124(build system:new): libutvideo (and decklink) fails with clang: error: invalid argument '-std=c99' not allowed with 'C++/ObjC++'

[FFmpeg]

#4124: libutvideo (and decklink) fails with clang: error: invalid argument
'-std=c99' not allowed with 'C++/ObjC++'
-------------------------------------+-------------------------------------
               Reporter:  cehoyos    |                  Owner:
                   Type:  defect     |                 Status:  new
               Priority:  normal     |              Component:  build
                Version:  git-       |  system
  master                             |               Keywords:
             Blocked By:             |               Blocking:
Reproduced by developer:  0          |  Analyzed by developer:  0
-------------------------------------+-------------------------------------
 https://ffmpeg.org/pipermail/ffmpeg-user/2014-November/024313.html
 {{{
 $ clang -v
 clang -v
 clang version 3.1 (branches/release_31 157047)
 Target: x86_64-unknown-linux-gnu
 Thread model: posix
 }}}
 Also reproducible with newer versions.
 {{{
 $ dash configure --enable-gpl --enable-libutvideo --cc=clang --cxx=clang
 ERROR: utvideo not found
 }}}
 {{{
 check_ld cxx -lutvideo -lstdc++
 check_cxx
 BEGIN /tmp/ffconf.ez4q4dPn.cpp
     1   #include <stdint.h>
     2   #include <stdlib.h>
     3   #include <utvideo/utvideo.h>
     4   #include <utvideo/Codec.h>
     5   int main(void) {
     6   CCodec* obj1;
     7   return 0; }
 END /tmp/ffconf.ez4q4dPn.cpp
 clang -D_ISOC99_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE
 -D_POSIX_C_SOURCE=200112 -D_XOPEN_SOURCE=600 -std=c99 -fomit-frame-pointer
 -pthread -D__STDC_CONSTANT_MACROS -c -o /tmp/ffconf.v9p62Akq.o
 /tmp/ffconf.ez4q4dPn.cpp
 error: invalid argument '-std=c99' not allowed with 'C++/ObjC++'
 ERROR: utvideo not found
 }}}
 This primarily affects osx users.
 For decklink, the same error is shown when compiling the decklink c++
 files.

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Ticket URL: <https://trac.ffmpeg.org/ticket/4124>
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