Is there a way to select the default C/C++ compiler (such as gcc or clang) for a GitHub Actions job?
To be precise, I want CMake to pick up different compilers without hacking the CMake command.
Ideally, by extending the build matrix. Similar to the Node.js version, as described in the official docs: https://help.github.com/en/articles/configuring-a-workflow#configuring-a-build-matrix
Something like that:
[..]
strategy:
matrix:
compiler: [gcc, clang]
[..]
https://gitlab.kitware.com/cmake/community/wikis/FAQ#how-do-i-use-a-different-compiler recommends using the CC
and CXX
environment variables to choose a compiler, and I like your idea of using a matrix to run under different compilers. So now we just need to look at https://help.github.com/en/articles/workflow-syntax-for-github-actions#jobsjob_idstrategymatrix and see how to use the matrix. Here's the example snippet they show:
runs-on: ${{ matrix.os }}
strategy:
matrix:
os: [ubuntu-16.04, ubuntu-18.04]
node: [6, 8, 10]
steps:
- uses: actions/setup-node@v1
with:
node-version: ${{ matrix.node }}
As you can see, specifying a foo
variable under matrix:
then creates a matrix.foo
value that you can reference elsewhere. So you'd do something like this:
name: Build master
on: [push]
strategy:
matrix:
compiler: [gcc, clang]
jobs:
build:
runs-on: ubuntu-latest
steps:
- uses: actions/checkout@v1
- name: Run CMake
env:
CC: ${{ matrix.compiler }}
run: cmake --your-args-here
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