stable-x86_64-pc-windows-gnu: Conflicts with static libgcc

[1480c1]

Attempting to compile statically FFmpeg with rav1e's c api causes some linking error

D:/DEV/media-autobuild/media-autobuild_suite/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/9.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: D:/DEV/media-autobuild/media-autobuild_suite/local64/lib/librav1e.a(compiler_builtins-477d6ada7584f678.compiler_builtins.1c0g4lf3-cgu.0.rcgu.o): in function `___chkstk_ms':
C:\Users\VssAdministrator\.cargo\registry\src\github.com-1ecc6299db9ec823\compiler_builtins-0.1.18\src/x86_64.rs:15: multiple definition of `___chkstk_ms'; D:/DEV/media-autobuild/media-autobuild_suite/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/9.2.0/libgcc.a(_chkstk_ms.o):(.text+0x0): first defined here
collect2.exe: error: ld returned 1 exit status

Orignially reported m-ab-s/media-autobuild_suite#1483

[mati865]

@1480c1 could you retest with nightly or provide steps to reproduce the error?

[1480c1]

Sure, I can try once I have time.
The way I encountered it was trying to compile rav1e(rust but using cargo-c to generate a c library) https://github.com/xiph/rav1e with FFmpeg(C) and compiling them both static. I will try to see if I can get steps to reproduce exactly or if there's a simpler way

[1480c1]

Hmm, seems like I am no longer able to reproduced inside a clean VM with just msys2 installed

#!/usr/bin/bash

mkdir rusty

export CARGO_HOME="$PWD/rusty" RUSTUP_HOME="$PWD/rusty"
export PKG_CONFIG_PATH=$PKG_CONFIG_PATH:$PWD/rusty/lib/pkgconfig
export CFLAGS+=" -static -static-libgcc" LDFLAGS+=" -static-libgcc"


curl https://sh.rustup.rs -sSo rustup.sh
./rustup.sh -v -y --no-modify-path --default-host=${MSYSTEM_CARCH:-x86_64}-pc-windows-gnu --default-toolchain=stable

export PATH=$PATH:$PWD/rusty/bin

# cargo version at this time: cargo 1.45.1 (f242df6ed 2020-07-22)

cargo install cargo-c

git clone --branch master --depth 1 https://github.com/xiph/rav1e.git || {
    git -C rav1e fetch
    git remote set-head -a origin
    git -C rav1e reset --hard origin/HEAD
}

(
    cd rav1e &&
        cargo capi install --release --prefix "$PWD/local" --jobs "$(nproc)" &&
        install -Dp -t "$CARGO_HOME/lib" "./local/lib/librav1e.a" && 
        install -Dp -t "$CARGO_HOME/lib/pkgconfig" "./local/lib/pkgconfig/rav1e.pc" && 
        install -Dp -t "$CARGO_HOME/include/rav1e" "./local/include/rav1e"/*.h
) || exit

git clone --branch master --depth 1 https://git.ffmpeg.org/ffmpeg.git || {
    git -C ffmpeg fetch
    git remote set-head -a origin
    git -C ffmpeg reset --hard origin/HEAD
}

find . -name rav1e.dll -o -name librav1e.dll.a -delete

(
    cd ffmpeg &&
        ./configure --enable-librav1e --disable-shared --enable-static --disable-ffprobe --pkg-config-flags=--static &&
        make -j "$(nproc)"
) || exit

./ffmpeg/ffmpeg -h encoder=librav1e
ffmpeg version git-2020-08-12-bb59bdb Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 10.2.0 (Rev1, Built by MSYS2 project)
  configuration: --enable-librav1e --disable-shared --enable-static --disable-ffprobe --pkg-config-flags=--static
  libavutil      56. 58.100 / 56. 58.100
  libavcodec     58.100.100 / 58.100.100
  libavformat    58. 50.100 / 58. 50.100
  libavdevice    58. 11.101 / 58. 11.101
  libavfilter     7. 87.100 /  7. 87.100
  libswscale      5.  8.100 /  5.  8.100
  libswresample   3.  8.100 /  3.  8.100
Encoder librav1e [librav1e AV1]:
    General capabilities: delay threads
    Threading capabilities: auto
    Supported pixel formats: yuv420p yuvj420p yuv420p10le yuv420p12le yuv422p yuvj422p yuv422p10l420p yuv420p10le yuv420p12le yuv422p yuvje yuv444p12le422p yuv422p10le yuv422p12le yuv444p yuvj444p yuv444p10le yuv444p12le             ... use constant quantizer mode (from -1 to 255) (defaul
librav1e AVOptions:
  -qp                <int>        E..V...... what speed preset to use (from -1 to 10) (default -1... use constant quantizer mode (from -1
to 255) (default -1)                     ... number of tiles encode with (from -1 to I64_MAX) (de
  -speed             <int>        E..V...... what speed preset to use (from -1 to 10) (default -1)
  -tiles             <int>        E..V...... number of tiles encode with (from -1 to I64_MAX) (default 0)
  -tile-rows         <int>        E..V...... number of tiles rows to encode with (from -1 to I64_MAX) (default 0)
  -tile-columns      <int>        E..V...... number of tiles columns to encode with (from -1 to I64_MAX) (default 0)
  -rav1e-params      <dictionary> E..V...... set the rav1e configuration using a :-separated list of key=value parameters

I guess I will close this issue now

[mati865]

Thank you for testing this again.