[FFmpeg-user] avformat_find_stream_info broken recently with multiple threads?

Carl Eugen Hoyos cehoyos at ag.or.at
Thu Jan 3 07:34:23 CET 2013

Dennis Volodomanov <volodomanov <at> gmail.com> writes:

> check_func pthread_create -pthread
> check_ld cc -pthread
> check_cc -pthread
> BEGIN /tmp/ffconf.mT27sYqz.c
>      1    extern int pthread_create();
>      2    int main(void){ pthread_create(); }
> END /tmp/ffconf.mT27sYqz.c
> /home/dennis/cc/sandbox/mingw-w64-i686/bin/i686-w64-mingw32-gcc 
> -U__STRICT_ANSI__ -std=c99 -fomit-frame-pointer -pthread -c -o 
> /tmp/ffconf.YjvTgNa1.o /tmp/ffconf.mT27sYqz.c
> /home/dennis/cc/sandbox/mingw-w64-i686/bin/i686-w64-mingw32-gcc 
> -Wl,--as-needed -pthread -o /tmp/ffconf.pKdpHWud.exe 
> /tmp/ffconf.YjvTgNa1.o -lbz2 -lz -lpsapi -ladvapi32 -lshell32

The mystery is now why does it work here but not when linking 
the library?

Does the following compile with above compilation options?
#include <pthread.h>
int main(void){ pthread_create(); }

And one more question:
Is the linking failure (if you don't add the --extra-cflags) 
only reproducible with --enable-shared or also with static 

Carl Eugen

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