[FFmpeg-trac] #10421(build system:new): undefined reference to `ff_ac3_find_syncword' when ac3 parser is disabled, aac enabled

[FFmpeg]

#10421: undefined reference to `ff_ac3_find_syncword' when ac3 parser is disabled,
aac enabled
-------------------------------------+-------------------------------------
             Reporter:  Adam Baxter  |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:  build        |                  Version:  git-
  system                             |  master
             Keywords:  AAC ac3      |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug: enabling aac only results in undefined reference to
 `ff_ac3_find_syncword'
 How to reproduce:
 {{{
 ./configure --disable-everything --enable-ffmpeg --enable-ffprobe
 --disable-stripping --enable-static --disable-shared --enable-pic --extra-
 ldexeflags=-static --prefix=/output/ --enable-cross-compile --cross-
 prefix=x86_64-linux-musl- --arch=x86_64 --prefix=/output --target-os=linux
 --enable-demuxer=mpegts --enable-decoder=aac --enable-parser=aac --enable-
 demuxer=aac

 make

 ...
 #25 10.88 LD    ffmpeg_g
 #25 10.88 LD    ffprobe_g
 #25 11.09 /usr/bin/../lib/gcc/x86_64-linux-musl/13.1.0/../../../../x86_64
 -linux-musl/bin/ld: libavcodec/libavcodec.a(aac_ac3_parser.o): in function
 `ff_aac_ac3_parse':
 #25 11.09 /src/ffmpeg-6.0/libavcodec/aac_ac3_parser.c:99: undefined
 reference to `ff_ac3_find_syncword'
 #25 11.09 /usr/bin/../lib/gcc/x86_64-linux-musl/13.1.0/../../../../x86_64
 -linux-musl/bin/ld: libavcodec/libavcodec.a(aac_ac3_parser.o): in function
 `ff_aac_ac3_parse':
 #25 11.09 /src/ffmpeg-6.0/libavcodec/aac_ac3_parser.c:99: undefined
 reference to `ff_ac3_find_syncword'
 #25 11.24 collect2: error: ld returned 1 exit status
 #25 11.24 make: *** [Makefile:131: ffprobe_g] Error 1
 #25 11.24 make: *** Waiting for unfinished jobs....
 #25 11.24 collect2: error: ld returned 1 exit status
 #25 11.24 make: *** [Makefile:131: ffmpeg_g] Error 1
 }}}

 Same issue with the 6.0 tarball and git
 16fdb48e0dead244bddf3a0ae9d459d02b4443b1


 adding --enable-parser=ac3 works around this issue, but it seems like
 these two components should be independent.
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/10421>
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