[FFmpeg-trac] #2009(build system:new): Bogus library dependencies (e.g. on SDL)

[FFmpeg]

#2009: Bogus library dependencies (e.g. on SDL)
-------------------------------------+-------------------------------------
             Reporter:  divVerent    |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:  build        |                  Version:
  system                             |  unspecified
             Keywords:  pkg-config   |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug:
 pkg-config files contain unneeded dependencies (e.g. libavcodec.pc
 contains -lSDL)

 How to reproduce:
 {{{
 % grep SDL /usr/lib/pkgconfig/libav*
 /usr/lib/pkgconfig/libavcodec.pc:Libs: -L${libdir} -lavcodec -ldl -lva
 -lXfixes -lXext -lX11 -ljack -lasound -lSDL -lpthread -lx264 -lvorbisenc
 -lvorbis -logg -ltheoraenc -ltheoradec -logg -lmp3lame -lfdk-aac -lfaac
 -lass -lm -pthread -lbz2 -lz -lrt
 /usr/lib/pkgconfig/libavdevice.pc:Libs: -L${libdir} -lavdevice -ldl -lva
 -lXfixes -lXext -lX11 -ljack -lasound -lSDL -lpthread -lx264 -lvorbisenc
 -lvorbis -logg -ltheoraenc -ltheoradec -logg -lmp3lame -lfdk-aac -lfaac
 -lass -lm -pthread -lbz2 -lz -lrt
 /usr/lib/pkgconfig/libavfilter.pc:Libs: -L${libdir} -lavfilter -ldl -lva
 -lXfixes -lXext -lX11 -ljack -lasound -lSDL -lpthread -lx264 -lvorbisenc
 -lvorbis -logg -ltheoraenc -ltheoradec -logg -lmp3lame -lfdk-aac -lfaac
 -lass -lm -pthread -lbz2 -lz -lrt
 /usr/lib/pkgconfig/libavformat.pc:Libs: -L${libdir} -lavformat -ldl -lva
 -lXfixes -lXext -lX11 -ljack -lasound -lSDL -lpthread -lx264 -lvorbisenc
 -lvorbis -logg -ltheoraenc -ltheoradec -logg -lmp3lame -lfdk-aac -lfaac
 -lass -lm -pthread -lbz2 -lz -lrt
 % nm -A /usr/lib/libavcodec.a  | grep SDL
 %
 }}}

 Issue is that $extralibs is generally used in the configure script for
 multiple modules, despite them needing different things. It causes issues
 for programs linking to both libavcodec/libavformat and SDL2.

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2009>
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