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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 6))
39 message(FATAL_ERROR "clang 6 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)
50 if (GMX_CUDA_TARGET_COMPUTE)
51 message(WARNING "Values passed in GMX_CUDA_TARGET_COMPUTE will be ignored; clang will by default include PTX in the binary.")
54 if (GMX_CUDA_TARGET_SM)
55 set(_CUDA_CLANG_GENCODE_FLAGS)
56 set(_target_sm_list ${GMX_CUDA_TARGET_SM})
57 foreach(_target ${_target_sm_list})
58 list(APPEND _CUDA_CLANG_GENCODE_FLAGS "--cuda-gpu-arch=sm_${_target}")
61 list(APPEND _CUDA_CLANG_GENCODE_FLAGS "--cuda-gpu-arch=sm_30")
62 list(APPEND _CUDA_CLANG_GENCODE_FLAGS "--cuda-gpu-arch=sm_35")
63 # clang 6.0 + CUDA 9.0 seems to have issues generating code for sm_37
64 if (CMAKE_CXX_COMPILER_VERSION VERSION_LESS 6.0 OR CMAKE_CXX_COMPILER_VERSION VERSION_GREATER 6.0.999)
65 list(APPEND _CUDA_CLANG_GENCODE_FLAGS "--cuda-gpu-arch=sm_37")
67 list(APPEND _CUDA_CLANG_GENCODE_FLAGS "--cuda-gpu-arch=sm_50")
68 list(APPEND _CUDA_CLANG_GENCODE_FLAGS "--cuda-gpu-arch=sm_52")
69 list(APPEND _CUDA_CLANG_GENCODE_FLAGS "--cuda-gpu-arch=sm_60")
70 list(APPEND _CUDA_CLANG_GENCODE_FLAGS "--cuda-gpu-arch=sm_61")
71 list(APPEND _CUDA_CLANG_GENCODE_FLAGS "--cuda-gpu-arch=sm_70")
72 # Enable this when clang (8.0 ?) introduces sm_75 support
73 #if (NOT CUDA_VERSION VERSION_LESS 10.0)
74 # list(APPEND _CUDA_CLANG_GENCODE_FLAGS "--cuda-gpu-arch=sm_75")
77 if (GMX_CUDA_TARGET_SM)
78 set_property(CACHE GMX_CUDA_TARGET_SM PROPERTY HELPSTRING "List of CUDA GPU architecture codes to compile for (without the sm_ prefix)")
79 set_property(CACHE GMX_CUDA_TARGET_SM PROPERTY TYPE STRING)
83 list(APPEND _CUDA_CLANG_FLAGS "-x cuda" "-ffast-math")
85 list(APPEND _CUDA_CLANG_FLAGS "--cuda-path=${CUDA_TOOLKIT_ROOT_DIR}")
87 list(APPEND _CUDA_CLANG_FLAGS "${_CUDA_CLANG_GENCODE_FLAGS}")
88 foreach(_flag ${_CUDA_CLANG_FLAGS})
89 set(GMX_CUDA_CLANG_FLAGS "${GMX_CUDA_CLANG_FLAGS} ${_flag}")
92 if (CUDA_USE_STATIC_CUDA_RUNTIME)
93 set(GMX_CUDA_CLANG_LINK_LIBS "cudart_static")
95 set(GMX_CUDA_CLANG_LINK_LIBS "cudart")
97 set(GMX_CUDA_CLANG_LINK_LIBS "${GMX_CUDA_CLANG_LINK_LIBS}" "dl" "rt")
98 if (CUDA_64_BIT_DEVICE_CODE)
99 set(GMX_CUDA_CLANG_LINK_DIRS "${CUDA_TOOLKIT_ROOT_DIR}/lib64")
101 set(GMX_CUDA_CLANG_LINK_DIRS "${CUDA_TOOLKIT_ROOT_DIR}/lib")
104 gmx_test_clang_cuda_support()