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35 function (gmx_test_clang_cuda_support)
37 if ((NOT CMAKE_CXX_COMPILER_ID MATCHES "Clang") OR
38 (CMAKE_CXX_COMPILER_ID MATCHES "Clang" AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS "3.9"))
39 message(FATAL_ERROR "clang 3.9 or later required with GMX_CLANG_CUDA=ON!")
42 # NOTE: we'd ideally like to use a compile check here, but the link-stage
43 # fails as the clang invocation generated seems to not handle well some
44 # (GPU code) in the object file generated during compilation.
45 # SET(CMAKE_REQUIRED_FLAGS ${FLAGS})
46 # SET(CMAKE_REQUIRED_LIBRARIES ${LIBS})
47 # CHECK_CXX_SOURCE_COMPILES("int main() { int c; cudaGetDeviceCount(&c); return 0; }" _CLANG_CUDA_COMPILES)
51 if (CMAKE_CXX_COMPILER_VERSION VERSION_LESS "4.0" AND
52 NOT CUDA_VERSION VERSION_LESS "8.0")
53 message(FATAL_ERROR "clang ${CMAKE_CXX_COMPILER_VERSION} for CUDA is only compatible with CUDA version <=8.0")
56 if (GMX_CUDA_TARGET_COMPUTE)
57 message(WARNING "Values passed in GMX_CUDA_TARGET_COMPUTE will be ignored; clang will by default include PTX in the binary.")
60 if (GMX_CUDA_TARGET_SM)
61 set(_CUDA_CLANG_GENCODE_FLAGS)
62 set(_target_sm_list ${GMX_CUDA_TARGET_SM})
63 foreach(_target ${_target_sm_list})
64 list(APPEND _CUDA_CLANG_GENCODE_FLAGS "--cuda-gpu-arch=sm_${_target}")
67 list(APPEND _CUDA_CLANG_GENCODE_FLAGS "--cuda-gpu-arch=sm_30")
68 list(APPEND _CUDA_CLANG_GENCODE_FLAGS "--cuda-gpu-arch=sm_35")
69 # clang 6.0 + CUDA 9.0 seems to have issues generating code for sm_37
70 if (CMAKE_CXX_COMPILER_VERSION VERSION_LESS 6.0 OR CMAKE_CXX_COMPILER_VERSION VERSION_GREATER 6.0.999)
71 list(APPEND _CUDA_CLANG_GENCODE_FLAGS "--cuda-gpu-arch=sm_37")
73 list(APPEND _CUDA_CLANG_GENCODE_FLAGS "--cuda-gpu-arch=sm_50")
74 list(APPEND _CUDA_CLANG_GENCODE_FLAGS "--cuda-gpu-arch=sm_52")
75 if (NOT CUDA_VERSION VERSION_LESS 8.0)
76 list(APPEND _CUDA_CLANG_GENCODE_FLAGS "--cuda-gpu-arch=sm_60")
77 list(APPEND _CUDA_CLANG_GENCODE_FLAGS "--cuda-gpu-arch=sm_61")
79 if (NOT CUDA_VERSION VERSION_LESS 9.0)
80 list(APPEND _CUDA_CLANG_GENCODE_FLAGS "--cuda-gpu-arch=sm_70")
82 # Enable this when clang (8.0 ?) introduces sm_75 support
83 #if (NOT CUDA_VERSION VERSION_LESS 10.0)
84 # list(APPEND _CUDA_CLANG_GENCODE_FLAGS "--cuda-gpu-arch=sm_75")
87 if (GMX_CUDA_TARGET_SM)
88 set_property(CACHE GMX_CUDA_TARGET_SM PROPERTY HELPSTRING "List of CUDA GPU architecture codes to compile for (without the sm_ prefix)")
89 set_property(CACHE GMX_CUDA_TARGET_SM PROPERTY TYPE STRING)
93 list(APPEND _CUDA_CLANG_FLAGS "-x cuda" "-ffast-math")
95 list(APPEND _CUDA_CLANG_FLAGS "--cuda-path=${CUDA_TOOLKIT_ROOT_DIR}")
97 list(APPEND _CUDA_CLANG_FLAGS "${_CUDA_CLANG_GENCODE_FLAGS}")
98 foreach(_flag ${_CUDA_CLANG_FLAGS})
99 set(GMX_CUDA_CLANG_FLAGS "${GMX_CUDA_CLANG_FLAGS} ${_flag}")
102 if (CUDA_USE_STATIC_CUDA_RUNTIME)
103 set(GMX_CUDA_CLANG_LINK_LIBS "cudart_static")
105 set(GMX_CUDA_CLANG_LINK_LIBS "cudart")
107 set(GMX_CUDA_CLANG_LINK_LIBS "${GMX_CUDA_CLANG_LINK_LIBS}" "dl" "rt")
108 if (CUDA_64_BIT_DEVICE_CODE)
109 set(GMX_CUDA_CLANG_LINK_DIRS "${CUDA_TOOLKIT_ROOT_DIR}/lib64")
111 set(GMX_CUDA_CLANG_LINK_DIRS "${CUDA_TOOLKIT_ROOT_DIR}/lib")
114 gmx_test_clang_cuda_support()