Revamp matrix strategy

Author: bdutro-mips

.github/workflows/ubuntu-build.yml

@@ -12,16 +12,30 @@ jobs:
             cxx: g++
           - c: clang
             cxx: clang++
-        build_config:
+        build_type: [Debug, Release]
+        lto_config:
+          - lto: false
+            full_lto: false
+          - lto: true
+            full_lto: false
+          - lto: true
+            full_lto: true
+        exclude:
+          # Don't try to build Debug with LTO enabled
           - build_type: Debug
-            lto: false
-          - build_type: Release
-            lto: false
-          - build_type: Release
-            lto: true
+            lto_config:
+              lto: true
+          # GCC doesn't have a thin LTO mode
+          - compilers:
+              c: gcc
+              cxx: g++
+            build_type: Release 
+            lto_config:
+              lto: true
+              full_lto: false
 
     env:
-      LTO_CONFIG: ${{ matrix.build_config.lto && '-DFULL_LTO=1' || '' }}
+      LTO_CONFIG: ${{ format('-DNO_STF_LTO={0} -DFULL_LTO={1}', !matrix.lto_config.lto, matrix.lto_config.full_lto) }}
 
     runs-on: ubuntu-latest
 
@@ -38,12 +52,12 @@ jobs:
 
     - name: Configure CMAKE
       working-directory: ${{runner.workspace}}/build
-      run: CC=${{ matrix.compilers.c }} CXX=${{ matrix.compilers.cxx }} cmake $GITHUB_WORKSPACE -DCMAKE_BUILD_TYPE=${{ matrix.build_config.build_type }} -DBUILD_STF_PYTHON_LIB=ON $LTO_CONFIG
+      run: CC=${{ matrix.compilers.c }} CXX=${{ matrix.compilers.cxx }} cmake $GITHUB_WORKSPACE -DCMAKE_BUILD_TYPE=${{ matrix.build_type }} -DBUILD_STF_PYTHON_LIB=ON $LTO_CONFIG
 
     - name: Build
       working-directory: ${{runner.workspace}}/build
-      run: cmake --build . --config ${{ matrix.build_config.build_type }} -j 4
+      run: cmake --build . --config ${{ matrix.build_type }} -j 4
 
     - name: Regress
       working-directory: ${{runner.workspace}}/build
-      run: cmake --build . --config ${{ matrix.build_config.build_type }} -j 4 --target regress
+      run: cmake --build . --config ${{ matrix.build_type }} -j 4 --target regress