[FFmpeg-trac] #3626(undetermined:closed): add 'extern "C"' to headers

[FFmpeg]

#3626: add 'extern "C"' to headers
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             Reporter:  spraff       |                    Owner:  (none)
                 Type:  defect       |                   Status:  closed
             Priority:  wish         |                Component:
                                     |  undetermined
              Version:  unspecified  |               Resolution:  wontfix
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by jwakely):

 Could this wontfix decision be revisited? Would you accept a patch to add
 the necessary boilerplater?

 The current situation causes every C++ project that uses ffmpeg headers to
 deal with it, which then causes other problems downstream. The documented
 way to include ffmpeg headers from C++ sources violates the C++ standard.
 The standard says you can't include any standard header (such as
 {{{<math.h>}}}) inside an {{{extern "C"}}} declaration.

 Which C99 features are used which would cause a problem? Apparently it
 ''doesn't'' cause a problem, because many C++ projects such as Qt do
 include the headers. But they have to violate the C++ standard to do so,
 and the fall out from that can be harder for those projects to work around
 (it requires changes in the C++ standard library implementation to
 accommodate your policy).
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/3626#comment:3>
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