Re: openal-1.14 and ffmpeg-0.7.13

On 10/02/2012 05:46 PM, Dennis Veatch wrote:
> Trying to compile openal and get this error;
>
> ...
> Linking C executable alstream
> /usr/bin/ld: CMakeFiles/alstream.dir/examples/alffmpeg.o: undefined
> reference to symbol 'av_malloc@@LIBAVUTIL_50'
> /usr/bin/ld: note: 'av_malloc@@LIBAVUTIL_50' is defined in DSO
> /usr/lib/libavutil.so.50 so try adding it to the linker command line
> /usr/lib/libavutil.so.50: could not read symbols: Invalid operation
> collect2: error: ld returned 1 exit status
> make[2]: *** [alstream] Error 1
> make[1]: *** [CMakeFiles/alstream.dir/all] Error 2
> make: *** [all] Error 2

That's odd. It should already be including libavutil on the linker. It 
checks for:

PKG_CHECK_MODULES(FFMPEG libavcodec>=52.123.0 libavformat>=52.111.0 
libavutil>=51.9.1)

which combines all the libs needed for those packages into 
FFMPEG_LIBRARIES, which is then used:

ADD_EXECUTABLE(alstream examples/alhelpers.c examples/alffmpeg.c 
examples/alstream.c)
TARGET_LINK_LIBRARIES(alstream ${FFMPEG_LIBRARIES} ${LIBNAME})
SET_TARGET_PROPERTIES(alstream PROPERTIES COMPILE_FLAGS "${FFMPEG_CFLAGS}")

What's interesting is that it thinks it needs to use libavutil.so.50, 
but the check should require libavutil.so.51 or newer. Any idea why it 
might be trying to use av_malloc@@LIBAVUTIL_50 instead of 
av_malloc@@LIBAVUTIL_51?


If you don't care about the example player, you can disable it by 
passing setting EXAMPLES to OFF with cmake (-DEXAMPLES=OFF) on the cmake 
command line), which should let make finish up.
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