Link MPI public by default.

CMake/3rd/mpi.cmake

@@ -3,7 +3,6 @@ function (linkMPI)
     find_package(MPI REQUIRED)
 
     vf_get_library_name(library_name)
-    #target_include_directories(${library_name} PUBLIC ${MPI_CXX_INCLUDE_PATH})
-    target_link_libraries(${library_name} PRIVATE MPI::MPI_CXX)
+    target_link_libraries(${library_name} PUBLIC MPI::MPI_CXX)
 
 endfunction()
\ No newline at end of file

src/cpu/VirtualFluidsCore/CMakeLists.txt

@@ -31,6 +31,8 @@ if(BUILD_USE_OPENMP)
    linkOpenMP(${library_name})
 endif()
 
+linkMPI()
+
 target_include_directories(${library_name} PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/BoundaryConditions)
 target_include_directories(${library_name} PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/Connectors)
 target_include_directories(${library_name} PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/Data)