Actually use MinGW on CI

The MinGW job was also using MSVC compiler by mistake

.github/workflows/rust-tests.yml

@@ -12,9 +12,16 @@ concurrency:
 
 jobs:
  rust-tests:
- runs-on: ${{ matrix.os }}
  name: ${{ matrix.os }} / Rust ${{ matrix.rust-version }}${{ matrix.extra-name }}
+ runs-on: ${{ matrix.os }}
  container: ${{ matrix.container }}
+ defaults:
+ run:
+ shell: "bash"
+ env:
+ CMAKE_CXX_COMPILER: ${{ matrix.cxx }}
+ CMAKE_C_COMPILER: ${{ matrix.cc }}
+ CMAKE_GENERATOR: ${{ matrix.cmake_generator }}
  strategy:
  matrix:
  include:
@@ -23,6 +30,9 @@ jobs:
  rust-version: stable
  rust-target: x86_64-unknown-linux-gnu
  extra-name: ", no features"
+ cxx: g++
+ cc: gcc
+ cmake_generator: Unix Makefiles
 
  # test with all features (i.e static build + ndarray)
  - os: ubuntu-20.04
@@ -31,6 +41,9 @@ jobs:
  cargo-test-flags: --release --all-features
  do-valgrind: true
  extra-name: ", all features, release"
+ cxx: g++
+ cc: gcc
+ cmake_generator: Unix Makefiles
 
  # check the build on a stock Ubuntu 20.04, which uses cmake 3.16, and
  # with our minimal supported rust version
@@ -40,24 +53,36 @@ jobs:
  rust-target: x86_64-unknown-linux-gnu
  cargo-build-flags: --features=rayon
  extra-name: ", cmake 3.16"
+ cxx: g++
+ cc: gcc
+ cmake_generator: Unix Makefiles
 
  - os: macos-14
  rust-version: stable
  rust-target: aarch64-apple-darwin
  cargo-test-flags: --features=rayon
  extra-name: ""
+ cxx: clang++
+ cc: clang
+ cmake_generator: Unix Makefiles
 
  - os: windows-2019
  rust-version: stable
  rust-target: x86_64-pc-windows-msvc
  cargo-build-flags: --features=rayon
  extra-name: " / MSVC"
+ cxx: cl.exe
+ cc: cl.exe
+ cmake_generator: Visual Studio 16 2019
 
  - os: windows-2019
  rust-version: stable
  rust-target: x86_64-pc-windows-gnu
  cargo-build-flags: --features=rayon
  extra-name: " / MinGW"
+ cxx: g++.exe
+ cc: gcc.exe
+ cmake_generator: MinGW Makefiles
  steps:
  - name: install dependencies in container
  if: matrix.container == 'ubuntu:20.04'
@@ -99,7 +124,11 @@ jobs:
  echo "CMAKE_CXX_COMPILER_LAUNCHER=sccache" >> $GITHUB_ENV
 
  - name: run tests
- run: cargo test --package metatensor --package metatensor-core --target ${{ matrix.rust-target }} ${{ matrix.cargo-build-flags }}
+ run: |
+ echo $CMAKE_CXX_COMPILER
+ echo $CMAKE_C_COMPILER
+ echo $CMAKE_GENERATOR
+ cargo test --package metatensor --package metatensor-core --target ${{ matrix.rust-target }} ${{ matrix.cargo-build-flags }}
 
  - name: check the code can be compiled as a standalone crate
  if: matrix.os != 'windows-2019'