Merge branch 'silence-clang-mpi-warnigs' into 'master'

Silence warnings in mpi.h for (mpich and clang12)

See merge request walberla/walberla!353

.clang-tidy

@@ -28,6 +28,7 @@ modernize-*,
 -modernize-avoid-c-arrays,
 
 mpi-*,
+-mpi-type-mismatch,
 
 openmp-*,
 -openmp-exception-escape,

src/core/mpi/MPIWrapper.h

@@ -61,7 +61,14 @@ namespace mpistubs {
 #pragma warning ( push, 1 )
 #endif
 
+#if ( defined WALBERLA_CXX_COMPILER_IS_GNU ) || ( defined WALBERLA_CXX_COMPILER_IS_CLANG )
+#   pragma GCC diagnostic push
+#   pragma GCC diagnostic ignored "-Wsign-conversion"
+#endif
 #include <mpi.h>
+#if ( defined WALBERLA_CXX_COMPILER_IS_GNU ) || ( defined WALBERLA_CXX_COMPILER_IS_CLANG )
+#   pragma GCC diagnostic pop
+#endif
 
 #ifdef _MSC_VER
 #pragma warning ( pop )
@@ -284,8 +291,8 @@ using namespace mpistubs;
 namespace walberla {
 
 namespace mpi {
-   typedef int MPIRank;
-   typedef int MPISize;
+   using MPIRank = int;
+   using MPISize = int;
    const MPIRank INVALID_RANK = -1;
    const MPISize INVALID_SIZE = -1;
 } // namespace MPI