[ffmpeg] static linking impossible

[substring]

Description / Steps to reproduce the issue

Trying to build a basic ffmpeg example but statically linking ffmpeg fails.

Expected behavior

Have the resulting binary compile, linking no MSYS shared lib, just some genuine Windows DLL

Actual behavior

• Sample program used: https://github.com/tinybit/ffmpeg_code_examples/blob/main/01-remuxing.cpp (needs to fix av_mallocz_array to av_malloc_array)
• Build with g++ -std=c++11 -O3 01-remuxing.cpp -lsrt -lpthread -lz -ldl -lswresample -lm -lva -l:libavformat.a -l:libavcodec.a -l:libx264.a -l:libswresample.a -l:libavutil.a -o remux-> get a waterfall of undefined references (https://gist.github.com/substring/d14f4d9907e1a2afd209d6c4117f9ec8)
• build with g++ -std=c++11 -O3 01-remuxing.cpp -o remux -static $(pkgconf --static --cflags --libs libavformat libavcodec libswresample libavutil) -> multiple definitions of some rust code + warns about no static version about libva and libva_win32 (https://gist.github.com/substring/3a74a6200ae8315d57a87bef5a37b7d0)
• g++ -std=c++11 -O3 01-remuxing.cpp -o remux -Wl,--allow-multiple-definition -static $(pkgconf --static --cflags --libs libavformat libavcodec libswresample libavutil) -> no static version of libllc3, libva and libva_win32 (https://gist.github.com/substring/2961c7b2033965dab6d0de5963a1a95b)

#18827 is of no help although there are some common undefined references.

Or am I building wrong ? In which case does MSYS miss some "helpers" ?

Verification

• I have verified that my MSYS2 is up-to-date before submitting the report (see https://www.msys2.org/docs/updating/)

Windows Version

MINGW64_NT-10.0-26100

MINGW environments affected

• MINGW64
• MINGW32
• UCRT64
• CLANG64
• CLANGARM64

Are you willing to submit a PR?

No

[lazka]

See #8824 - I'm not sure if that ever got finished.

In general it's tricky to keep these things working as we don't use static linking ourselves, so don't noticed when things are broken or regress. Any idea there welcome.

[substring]

I thought maybe #18827 (comment) would be of some help when statically building ffmpeg

[Biswa96]

One of the dependency of gnutls, p11-kit can not be built as static library with autotools. https://github.com/p11-glue/p11-kit/blob/0dd113361057e477f40ff4d8788f3e7e400af5f9/configure.ac#L76-L77