Undo workarounds clang12

Author: ax3l

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

@@ -50,8 +50,8 @@ spack:
       paths:
         cc: /usr/lib/llvm-12/bin/clang
         cxx: /usr/lib/llvm-12/bin/clang++
-        f77: /usr/bin/mpif77
-        fc: /usr/bin/mpifort
+        f77: /usr/bin/gfortran
+        fc: /usr/bin/gfortran
       spec: clang@12.0.1
       target: x86_64
 

.github/workflows/linux.yml

@@ -186,7 +186,7 @@ jobs:
         sudo chmod +x /usr/bin/mpicc_clang
         sudo chmod +x /usr/bin/mpic++_clang
     - name: Build
-      env: {CC: mpicc_clang, CXX: mpic++_clang, CXXFLAGS: -Werror}
+      env: {CC: clang++-12, CXX: clang++-12, CXXFLAGS: -Werror}
       run: |
         cmake --version
         mpiexec --version