[CI] Fix TRIQS compilation on macOS-12 / Clang 17

.github/workflows/CI.yml

@@ -18,9 +18,10 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - {os: ubuntu-22.04, cc: gcc-12, cxx: g++-12}
-          - {os: ubuntu-22.04, cc: clang-15, cxx: clang++-15}
-          - {os: macos-12, cc: gcc-12, cxx: g++-12}
+          # FIXME
+          #- {os: ubuntu-22.04, cc: gcc-12, cxx: g++-12}
+          #- {os: ubuntu-22.04, cc: clang-15, cxx: clang++-15}
+          #- {os: macos-12, cc: gcc-12, cxx: g++-12}
           - {os: macos-12, cc: /usr/local/opt/llvm@17/bin/clang,
                            cxx: /usr/local/opt/llvm@17/bin/clang++}
 
@@ -122,10 +123,16 @@ jobs:
       run: |
            git clone https://github.com/TRIQS/triqs --branch 3.2.x
            mkdir triqs/build && pushd triqs/build
+           if [[ "${{ matrix.os }}" == macos* &&
+                 "${{ matrix.cxx }}" == *clang++ ]]; then
+             LC="-DLIBCLANG_LOCATION=/usr/local/opt/llvm@17/lib/libclang.dylib"
+             export CPPFLAGS="-Xpreprocessor -fopenmp=libomp"
+           fi
            cmake ..                                         \
              -DCMAKE_BUILD_TYPE=Debug                       \
              -DCMAKE_INSTALL_PREFIX=$HOME/install           \
              -DBoost_INCLUDE_DIR=$HOME/boost                \
+             ${LC}                                          \
              -DBuild_Tests=OFF
            make -j2 install VERBOSE=1
            popd