GitHub Actions CI MSYS2 with MS-MPI on Windows

ci_cmake.yml

name: CI CMake

env:
  CMAKE_BUILD_TYPE: Release
  CMAKE_GENERATOR: Ninja
  CTEST_PARALLEL_LEVEL: 2

on:
  push:
  - "**/CMakeLists.txt"
  - "**.cmake"
  - "**.cmake.in"
  - "**.c"
  - "**.h"
  - "**.h.in"
  - ".github/workflows/ci_cmake.yml"
  pull_request:

jobs:

  windows:
    runs-on: windows-latest
    name: CMake build on Windows
    timeout-minutes: 15

    steps:
    - uses: msys2/setup-msys2@v2
      with:
        update: true
        install: >-
          mingw-w64-x86_64-cmake
          mingw-w64-x86_64-ninja
          mingw-w64-x86_64-msmpi

    - name: Put MSYS2_MinGW64 on PATH
      # there is not yet an environment variable for this path from msys2/setup-msys2
      run: echo "${{ runner.temp }}/msys64/mingw64/bin" | Out-File -FilePath $env:GITHUB_PATH -Encoding utf8 -Append

    - name: download MS-MPI setup (SDK is from MSYS2)
      run: curl -L -O https://github.com/microsoft/Microsoft-MPI/releases/download/v10.1.1/msmpisetup.exe

    - name: Install mpiexec.exe (-force needed to bypass GUI on headless)
      run: .\msmpisetup.exe -unattend -force

    - name: test that mpiexec.exe exists
      # can't use MSMPI_BIN as Actions doesn't update PATH from msmpisetup.exe
      run: Test-Path "C:\Program Files\Microsoft MPI\Bin\mpiexec.exe" -PathType leaf

    - name: put MSMPI_BIN on PATH (where mpiexec is)
      run: echo "C:\Program Files\Microsoft MPI\Bin\" | Out-File -FilePath $env:GITHUB_PATH -Encoding utf8 -Append

    - uses: actions/checkout@v2
      name: Checkout source code

# example build, whatever your project needs below
    - name: CMake configure
      run: cmake -B build

    - name: CMake build
      run: cmake --build build

    - name: CMake self-tests
      run: ctest --test-dir build --output-on-failure

updated for MSYS2 v2.5.0