[Libav-user] ff_log2_tab defined multiple times in the fmpeg 1.1 libraries, bug or feature ??

[Lars Hammarstrand]

Hello Alexey!

Thank you very much for the pointer which of course is permanently book
marked for some time ago ;-). I'm quite aware of the workaround but I'm
rather looking for the root cause of this change and what long term
solution we should use since the ffmpeg libraries for XBMC needs to work on
several different platforms (win, osx, ios, linux, android, etc) . So
the question unfortunately remains, will this behavior change in the future
or do weed need to automate a duplicate removal process for all platforms
while building the ffmpeg libraries for XBMC?

Any ideas why this was changed or if this problem will remain?
--

Regards, Lars.


2013/2/13 Alexey Belkevich <belkevich at mlsdev.com>

> Hello, can someone please explain the reason (and how to cope with) that *
> ff_log2_tab* is defined multiple times with *#include
> "libavutil/log2_tab.c*" in the ffmpeg v1.1 libraries like libavcodec
> 54.91.102 and companions ??
>
> This results in "duplicate symbols" while linking as listed below. To get
> ride of the problem we need to delete the duplicated entries by hand with
> "ar -d libxxx.a log2_tab.o" for all libraries but one, not a very smooth
> solution. Will this behavior change in the future or do weed need to
> automate a duplicate removal process while building the ffmpeg libraries
> for XBMC?
> --
>
> Thanks in advance!
> Regards, Lars.
>
>
> "duplicate symbol _ff_log2_tab in:
>    ../xbmc-12/lib/ffmpeg/libavcodec/libavcodec.a(log2_tab.o)
>    ../xbmc-12/lib/ffmpeg/libavformat/libavformat.a(log2_tab.o)
>
> duplicate symbol _ff_log2_tab in:
>     ../xbmc-12/lib/ffmpeg/libavcodec/libavcodec.a(log2_tab.o)
>     ../xbmc-12/lib/ffmpeg/libavutil/libavutil.a(log2_tab.o)
>
> duplicate symbol _ff_log2_tab in:
>     ../xbmc-12/lib/ffmpeg/libavcodec/libavcodec.a(log2_tab.o)
>     ../xbmc-12/lib/ffmpeg/libswresample/libswresample.a(log2_tab.o)
>
> ld: 3 duplicate symbols for architecture i386
> clang: error: linker command failed with exit code 1 (use -v to see
> invocation)
>
> The solution described in this article -
> http://www.tangentsoftworks.com/blog/2012/11/12/how-to-prepare-your-mac-for-ios-development-with-ffmpeg-libraries/.
> See comments.
>
> ar -dv libavcodec.a log2_tab.o
>
>
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