[FFmpeg-trac] #6456(build system:new): "undefined reference to `av...'" when building shared FFmpeg binaries

[FFmpeg]

#6456: "undefined reference to `av...'" when building shared FFmpeg binaries
-------------------------------------+-------------------------------------
             Reporter:  CoRoNe       |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:  build        |                  Version:  git-
  system                             |  master
             Keywords:               |               Blocked By:
  avfilter-6.dll                     |  Reproduced by developer:  0
             Blocking:               |
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 The last couple of months I've successfully cross-compiled several static
 FFmpeg builds. Now I've been trying to cross-compile a shared FFmpeg build
 with [https://github.com/Reino17/ffmpeg-windows-build-
 helpers/blob/master/cross_compile_ffmpeg.sh#L1619-L1755 this] script, but
 it constantly errors out at '//avfilter-6.dll//':
 {{{
 LD      libswresample/swresample-2.dll
 sed -e "s/ @[^ ]*//" libswresample/swresample-2.orig.def >
 libswresample/swresample-2.def; /cygdrive/m/ffmpeg-windows-build-helpers-
 master/native_build/windows/ffmpeg_local_builds/sandbox/cross_compilers/mingw-w64-i686/bin/i686-w64-mingw32-dlltool
 -m i386 -d libswresample/swresample-2.def -l libswresample/swresample.lib
 -D swresample-2.dll
 LD      libavcodec/avcodec-57.dll
 sed -e "s/ @[^ ]*//" libavcodec/avcodec-57.orig.def >
 libavcodec/avcodec-57.def; /cygdrive/m/ffmpeg-windows-build-helpers-
 master/native_build/windows/ffmpeg_local_builds/sandbox/cross_compilers/mingw-w64-i686/bin/i686-w64-mingw32-dlltool
 -m i386 -d libavcodec/avcodec-57.def -l libavcodec/avcodec.lib -D
 avcodec-57.dll
 LD      libavformat/avformat-57.dll
 /cygdrive/m/ffmpeg-windows-build-helpers-
 master/native_build/windows/ffmpeg_local_builds/sandbox/cross_compilers/mingw-w64-i686/i686-w64-mingw32/lib/libgnutls.a(sha256-ssse3-x86.o):
 warning: common of `_gnutls_x86_cpuid_s' overridden by definition
 /cygdrive/m/ffmpeg-windows-build-helpers-
 master/native_build/windows/ffmpeg_local_builds/sandbox/cross_compilers/mingw-w64-i686/i686-w64-mingw32/lib/libgnutls.a(x86-common.o):
 warning: defined here
 sed -e "s/ @[^ ]*//" libavformat/avformat-57.orig.def >
 libavformat/avformat-57.def; /cygdrive/m/ffmpeg-windows-build-helpers-
 master/native_build/windows/ffmpeg_local_builds/sandbox/cross_compilers/mingw-w64-i686/bin/i686-w64-mingw32-dlltool
 -m i386 -d libavformat/avformat-57.def -l libavformat/avformat.lib -D
 avformat-57.dll
 LD      libavfilter/avfilter-6.dll
 libavfilter/f_metadata.o:f_metadata.c:(.text+0xc2): undefined reference to
 `avio_write'
 libavfilter/f_metadata.o:f_metadata.c:(.text.unlikely+0x20b): undefined
 reference to `avio_open'
 libavfilter/f_metadata.o:f_metadata.c:(.text.unlikely+0x21b): undefined
 reference to `avio_open'
 libavfilter/f_metadata.o:f_metadata.c:(.text.unlikely+0x15): undefined
 reference to `avio_closep'
 libavfilter/lavfutils.o:lavfutils.c:(.text+0x41): undefined reference to
 `av_register_all'
 libavfilter/lavfutils.o:lavfutils.c:(.text+0x4d): undefined reference to
 `av_find_input_format'
 libavfilter/lavfutils.o:lavfutils.c:(.text+0x68): undefined reference to
 `avformat_open_input'
 libavfilter/lavfutils.o:lavfutils.c:(.text+0x82): undefined reference to
 `avformat_find_stream_info'
 libavfilter/lavfutils.o:lavfutils.c:(.text+0x114): undefined reference to
 `av_read_frame'
 libavfilter/lavfutils.o:lavfutils.c:(.text+0x244): undefined reference to
 `avformat_close_input'
 libavfilter/lavfutils.o:lavfutils.c:(.text+0x3f0): undefined reference to
 `avformat_close_input'
 libavfilter/src_movie.o:src_movie.c:(.text+0x256): undefined reference to
 `av_seek_frame'
 libavfilter/src_movie.o:src_movie.c:(.text+0x4d7): undefined reference to
 `av_seek_frame'
 libavfilter/src_movie.o:src_movie.c:(.text+0x851): undefined reference to
 `av_read_frame'
 libavfilter/src_movie.o:src_movie.c:(.text.unlikely+0x1a2): undefined
 reference to `av_register_all'
 libavfilter/src_movie.o:src_movie.c:(.text.unlikely+0x1b3): undefined
 reference to `av_find_input_format'
 libavfilter/src_movie.o:src_movie.c:(.text.unlikely+0x1d8): undefined
 reference to `avformat_open_input'
 libavfilter/src_movie.o:src_movie.c:(.text.unlikely+0x21b): undefined
 reference to `avformat_find_stream_info'
 libavfilter/src_movie.o:src_movie.c:(.text.unlikely+0x2ff): undefined
 reference to `av_seek_frame'
 libavfilter/src_movie.o:src_movie.c:(.text.unlikely+0x433): undefined
 reference to `av_find_best_stream'
 libavfilter/src_movie.o:src_movie.c:(.text.unlikely+0x4c4): undefined
 reference to `avformat_match_stream_specifier'
 libavfilter/src_movie.o:src_movie.c:(.text.unlikely+0x70): undefined
 reference to `avformat_close_input'
 libavfilter/vf_signature.o:vf_signature.c:(.text+0x298c): undefined
 reference to `av_get_frame_filename'
 libavfilter/vf_signature.o:vf_signature.c:(.text.unlikely+0x1d3):
 undefined reference to `av_get_frame_filename'
 libavfilter/vf_subtitles.o:vf_subtitles.c:(.text.unlikely+0x22c):
 undefined reference to `avformat_open_input'
 libavfilter/vf_subtitles.o:vf_subtitles.c:(.text.unlikely+0x271):
 undefined reference to `avformat_find_stream_info'
 libavfilter/vf_subtitles.o:vf_subtitles.c:(.text.unlikely+0x2b6):
 undefined reference to `av_find_best_stream'
 libavfilter/vf_subtitles.o:vf_subtitles.c:(.text.unlikely+0x6dd):
 undefined reference to `av_read_frame'
 libavfilter/vf_subtitles.o:vf_subtitles.c:(.text.unlikely+0x889):
 undefined reference to `avformat_close_input'
 collect2: error: ld returned 1 exit status
 make: *** [ffbuild/library.mak:102: libavfilter/avfilter-6.dll] Error 1
 }}}
 What am I doing wrong? Am I missing something? Is this a linker-issue of
 some sort?

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Ticket URL: <https://trac.ffmpeg.org/ticket/6456>
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