Github Action to problem match output from gcc. This allows warnings and errors from the compiler to be prominently featured in pull requests like so:

This is a direct port of the $gcc rule from vscode-cpptools. Typical usage will be:

    - uses: Joshua-Ashton/gcc-problem-matcher@master
    - name: Build Project
      run: make

Note that this action does not build your code for you. It only makes the errors and warnings from your compiler more prominent.

Keep this up-to-date with the upstream vscode-cpptools gcc matcher: https://github.com/microsoft/vscode-cpptools/blob/a8285cbc0efb5b09c2d2229b0e0772dcb3b602df/Extension/package.json#L76-L94