use GCC on linux

.github/workflows/python-package.yml

@@ -14,7 +14,7 @@ jobs:
     runs-on: Ubuntu-20.04
     strategy:
       matrix:
-        python-version: [3.7, 3.8, 3.9]
+        python-version: [ 3.7, 3.8, 3.9 ]
 
     steps:
       - uses: actions/checkout@v2
@@ -23,22 +23,33 @@ jobs:
           # recursively checkout submodules.
           submodules: 'true'
           lfs: 'true'
+
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v2
         with:
           python-version: ${{ matrix.python-version }}
+
+      - name: Set up Linux
+        if: runner.os == 'Linux'
+        run: |
+          echo "CC=gcc-10" >> $GITHUB_ENV
+          echo "CXX=g++-10" >> $GITHUB_ENV
+
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
           python -m pip install flake8 ninja Pillow click nose parameterized pybind11-stubgen
           if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
+
       - name: Lint with flake8
         run: |
           # stop the build if there are Python syntax errors or undefined names
           flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
           # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
           flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
+
       - name: Compile and install
         run: python setup.py build --debug install
+
       - name: Test with nose
         run: nosetests tests -d --with-coverage