The av_err2str macro in libavutil/error.h use compound literal:
#define av_err2str(errnum) \
av_make_error_string((char[AV_ERROR_MAX_STRING_SIZE]){0},
AV_ERROR_MAX_STRING_SIZE, errnum)
C++ compiler may not support it or treat the usage as invalid.
For example, g++ 5.4 raise an error: taking address of temporary
array.
1. Should the macro be defined for C only?
2. Or make it as valid C++? (I don't know how to do that)
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