Unexpected windows-gfortran version (8.1) in fpm/GitHub-CI(workflow:CI.yml)

[zoziha]

I don't know if this is a problem.
As far as I know, fortran-lang/stdlib has removed support for gcc version (<=8).
fpm/CI.yml expected the gcc version under windows to be 9, but actually got 8.1.
You can see my branch : check_gfortran_windows and screenshots:

I don't know how to solve this problem, so I file an issue here.

[awvwgk]

Yes, this is an issue, we are using GCC/MinGW packaged by choco, which has a track record of packaging only very few GCC versions and updating only sporadically (measured in multiple of years). The alternative is using MSYS2, which always comes with a fairly recent version of GCC, but there are other issues (like fortran-lang/setup-fpm#4, potential solution #401). Another option is to download a standalone GCC/MinGW package from elsewhere (https://equation.com or https://winlibs.com).

I haven't yet spend much time to investigate Windows building beyond exploring MSYS2 and packaging fpm for the MinGW toolchain myself.

[awvwgk]

Here is how far I got with the GCC versions from https://github.com/brechtsanders/winlibs_mingw/releases. The workflow below will create a matrix for GCC 11, 10 and 9 and check whether the compilers have been added to the PATH. I didn't get it working with stdlib because cmake and ninja just didn't want to work together correctly for some reason, but might still be useful for fpm:

jobs:
  gcc-build:
    runs-on: windows-latest
    strategy:
      fail-fast: false
      matrix:
        include:
          - gcc_v: 11
            tag: 11.2.0-12.0.1-9.0.0-r1
            zip: winlibs-x86_64-posix-seh-gcc-11.2.0-mingw-w64-9.0.0-r1.zip
          - gcc_v: 10
            tag: 10.3.0-12.0.0-9.0.0-r2
            zip: winlibs-x86_64-posix-seh-gcc-10.3.0-mingw-w64-9.0.0-r2.zip
          - gcc_v: 9
            tag: 9.4.0-9.0.0-r1
            zip: winlibs-x86_64-posix-seh-gcc-9.4.0-mingw-w64-9.0.0-r1.zip
    defaults:
      run:
        shell: bash
    steps:
    - uses: actions/checkout@v2

    - name: Download GCC/MinGW
      uses: i3h/download-release-asset@v1
      with:
        owner: brechtsanders
        repo: winlibs_mingw
        tag: ${{ matrix.tag }}
        file: ${{ matrix.zip }}

    - name: Setup GCC/MinGW
      run: |
        unzip ${{ matrix.zip }}
        echo "$PWD/mingw64/bin" >> $GITHUB_PATH

    - name: Check programs
      run: |
        echo $PATH
        gcc --version
        gfortran --version

Thanks @awvwgk. Since winlibs contains mingw32-make, we can build stdlib with it. I've tested this script locally, with winlibs in PATH:

set MAKE=mingw32-make
%MAKE% -f Makefile.manual FYPPFLAGS=-DMAXRANK=4

and it works.