250904.224947.CST revise test_gfortran.yml

Author: zaikunzhang

.github/workflows/test_gfortran.yml

@@ -29,7 +29,7 @@ jobs:
       matrix:
         os: [ubuntu-latest, windows-latest, macos-13, macos-latest]
         compiler: [gcc]
-        version: [13, 14]  # Too expensive to test all versions
+        version: [12, latest]  # Too expensive to test all versions
         solver: [newuoa, cobyla, lincoa, bobyqa, uobyqa]
         testdim: [small, big]
 
@@ -85,16 +85,27 @@ jobs:
         if: runner.os == 'Windows'
         run: $env:Path += ";C:\Program Files\Git\usr\bin;C:\Program Files\Git\bin;C:\ProgramData\Chocolatey\bin"
 
+      - name: Decide the gfortran version to use
+        shell: bash
+        run: |
+          if [[ "${{ matrix.version }}" == "latest" ]]; then
+              export GFORTRAN_VERSION=${{ env.GFORTRAN_VERSION }}
+          else
+              export GFORTRAN_VERSION=${{ matrix.version }}
+              echo "GFORTRAN_VERSION=${GFORTRAN_VERSION}" >> $GITHUB_ENV
+          fi
+          echo "To use gfortran version ${GFORTRAN_VERSION}"
+
       - name: Set up Fortran
         if: ${{ matrix.os != 'macos-latest' }}
         uses: fortran-lang/setup-fortran@main
         with:
           compiler: ${{ matrix.compiler }}
-          version: ${{ matrix.version }}
+          version: ${{ env.GFORTRAN_VERSION }}
       - name: Set up Fortran for macOS latest  # As of 20250816, fortran-lang/setup-fortran does not support macos-15
         if: ${{ matrix.os == 'macos-latest' }}
         run: |
-          sudo ln -sf $(which gfortran-${{ matrix.version }}) $(dirname $(which gfortran-${{ matrix.version }}))/gfortran
+          sudo ln -sf $(which gfortran-${{ env.GFORTRAN_VERSION }}) $(dirname $(which gfortran-${{ env.GFORTRAN_VERSION }}))/gfortran
 
       - name: Check gfortran version
         shell: bash