Add project() command to each target to enable cuda only for the targets which actually need cuda.

CMake/3rd.cmake

 include(${VF_CMAKE_DIR}/3rd/boost.cmake)
-include(${VF_CMAKE_DIR}/3rd/cuda.cmake)
 include(${VF_CMAKE_DIR}/3rd/gmock.cmake)
 include(${VF_CMAKE_DIR}/3rd/mpi.cmake)
 include(${VF_CMAKE_DIR}/3rd/OpenMP.cmake)
\ No newline at end of file

CMake/3rd/cuda.cmake

-
-function(linkCUDA)
-
-    set(CUDA_CUT_INCLUDE_DIR "${VF_THIRD_DIR}/cuda_samples/")
-
-    vf_get_library_name(library_name)
-    target_include_directories(${library_name} PRIVATE ${CUDA_CUT_INCLUDE_DIR})
-    target_include_directories(${library_name} PRIVATE ${CMAKE_CUDA_TOOLKIT_INCLUDE_DIRECTORIES})
-
-    # set the following properties only for specific targets
-    # set_property(TARGET ${targetName} PROPERTY CUDA_SEPARABLE_COMPILATION ON)
-    # set_property(TARGET ${targetName} PROPERTY CUDA_64_BIT_DEVICE_CODE ON)
-endfunction()

CMake/3rd/mpi.cmake

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

CMakeLists.txt

@@ -106,6 +106,10 @@ if(BUILD_VF_GPU)
 
     message("CUDA Architecture: ${CMAKE_CUDA_ARCHITECTURES}")
 
+    set(CUDA_CUT_INCLUDE_DIR "${VF_THIRD_DIR}/cuda_samples/")
+    include_directories(${CUDA_CUT_INCLUDE_DIR})
+    include_directories(${CMAKE_CUDA_TOOLKIT_INCLUDE_DIRECTORIES})
+
     include (gpu.cmake)
 endif()
 

gpu.cmake

 
-#############################################################
-###                     CUDAPATH                          ###
-#############################################################
-
-# if CMake cannot find CUDA by itself, set the correct paths manually:
-#SET(CUDA_CUT_INCLUDE_DIR    "/cluster/cuda/9.0/include;/cluster/cuda/9.0/samples/common/inc" CACHE PATH "CUDA_CUT_INCLUDE_DIR")
-#SET(CUDA_SAMPLE_INCLUDE_DIR "/cluster/cuda/9.0/samples/common/inc" CACHE PATH "CUDA_CUT_INCLUDE_DIR")
-
-
-#############################################################
 
 if(BUILD_NUMERIC_TESTS)
     set(CMAKE_CXX_STANDARD 17)
@@ -24,9 +14,6 @@ ENDIF()
 
 set(CMAKE_CUDA_FLAGS_DEBUG " -G" CACHE STRING "" FORCE)
 
-#############################################################
-
-enable_language(CUDA)
 
 ##########################################################################################################################
 ###                  Subdirectories                                                                                    ###

src/gpu/GksGpu/CMakeLists.txt

+project(GksGpu LANGUAGES CUDA CXX)
 
 vf_add_library(BUILDTYPE shared PRIVATE_LINK basics GksMeshAdapter)
 
-linkCUDA()
 linkMPI()
 
 vf_get_library_name(library_name)

src/gpu/GridGenerator/CMakeLists.txt

+project(GridGenerator LANGUAGES CUDA CXX)
 
 
 vf_add_library(PRIVATE_LINK basics)
 vf_get_library_name(library_name)
 
-linkCUDA()
 linkOpenMP(${library_name})
 
 

src/gpu/Traffic/CMakeLists.txt

-
+project(Traffic LANGUAGES CUDA CXX)
 
 vf_add_library(BUILDTYPE shared PRIVATE_LINK GridGenerator basics)
-
-linkCUDA()
\ No newline at end of file

src/gpu/VirtualFluids_GPU/CMakeLists.txt

+project(VirtualFluids_GPU LANGUAGES CUDA CXX)
 
 IF(MSVC)
     set(libsToLink ws2_32 GridGenerator basics Traffic) # ws_32 throws an error on Phoenix
@@ -10,7 +11,6 @@ ENDIF(MSVC)
 vf_add_library(PRIVATE_LINK ${libsToLink})
 
 linkMPI()
-linkCUDA()
 linkBoost(COMPONENTS "serialization")
 
 #SET(TPN_WIN32 "/EHsc")