Add MPI_Finalize "detouring" mechanism

CMakeLists.txt

@@ -330,6 +330,11 @@ add_subdirectory("src/forcing")
 add_subdirectory("src/utilities/mdarray")
 add_subdirectory("src/utilities/mdframe")
 add_subdirectory("src/utilities/logging")
+add_subdirectory("src/utilities/mpi")
+
+if(NGEN_WITH_MPI)
+    target_link_libraries(ngen PUBLIC NGen::MPI_Detour)
+endif()
 
 target_link_libraries(ngen
     PUBLIC

src/NGen.cpp

@@ -150,7 +150,7 @@ int main(int argc, char *argv[]) {
         } // if (mpi_rank == 0)
 
         #if NGEN_WITH_MPI
-        MPI_Finalize();
+        PMPI_Finalize();
         #endif
 
         exit(1);
@@ -587,7 +587,7 @@ int main(int argc, char *argv[]) {
     }
 
 #ifdef NGEN_MPI_ACTIVE
-    MPI_Finalize();
+    PMPI_Finalize();
 #endif
 
     return 0;

src/utilities/mpi/CMakeLists.txt

@@ -0,0 +1,2 @@
+add_library(MPIDetour SHARED "${CMAKE_CURRENT_LIST_DIR}/MPIDetour.c")
+add_library(NGen::MPI_Detour ALIAS MPIDetour)

src/utilities/mpi/MPIDetour.c

@@ -0,0 +1,3 @@
+int MPI_Finalize() {
+    return 0;
+}