Fix Clang-12 Path

Author: ax3l

.github/ci/spack-envs/clang12_py38_mpich_h5_ad2/spack.yaml

@@ -50,8 +50,8 @@ spack:
       modules: []
       operating_system: ubuntu22.04
       paths:
-        cc: /usr/lib/llvm-12/bin/clang
-        cxx: /usr/lib/llvm-12/bin/clang++
+        cc: /usr/bin/clang-12
+        cxx: /usr/bin/clang++-12
         f77: /usr/bin/gfortran
         fc: /usr/bin/gfortran
       spec: clang@12.0.1

.github/workflows/linux.yml

@@ -174,7 +174,7 @@ jobs:
         sudo apt-get install clang-12 gfortran libmpich-dev python3
         sudo .github/workflows/dependencies/install_spack
     - name: Build
-      env: {CC: clang++, CXX: clang++, CXXFLAGS: -Werror}
+      env: {CC: clang++-12, CXX: clang++-12, CXXFLAGS: -Werror}
       run: |
         cmake --version
         mpiexec --version