2 # This file is part of the GROMACS molecular simulation package.
4 # Copyright (c) 2017,2018,2019,2020, by the GROMACS development team, led by
5 # Mark Abraham, David van der Spoel, Berk Hess, and Erik Lindahl,
6 # and including many others, as listed in the AUTHORS file in the
7 # top-level source directory and at http://www.gromacs.org.
9 # GROMACS is free software; you can redistribute it and/or
10 # modify it under the terms of the GNU Lesser General Public License
11 # as published by the Free Software Foundation; either version 2.1
12 # of the License, or (at your option) any later version.
14 # GROMACS is distributed in the hope that it will be useful,
15 # but WITHOUT ANY WARRANTY; without even the implied warranty of
16 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 # Lesser General Public License for more details.
19 # You should have received a copy of the GNU Lesser General Public
20 # License along with GROMACS; if not, see
21 # http://www.gnu.org/licenses, or write to the Free Software Foundation,
22 # Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
24 # If you want to redistribute modifications to GROMACS, please
25 # consider that scientific software is very special. Version
26 # control is crucial - bugs must be traceable. We will be happy to
27 # consider code for inclusion in the official distribution, but
28 # derived work must not be called official GROMACS. Details are found
29 # in the README & COPYING files - if they are missing, get the
30 # official version at http://www.gromacs.org.
32 # To help us fund GROMACS development, we humbly ask that you cite
33 # the research papers on the package. Check out http://www.gromacs.org.
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" "-fcuda-flush-denormals-to-zero")
84 # Workaround for clang>=9 (Bug 45533). No CUDA file uses OpenMP.
85 list(APPEND _CUDA_CLANG_FLAGS "-fno-openmp")
87 list(APPEND _CUDA_CLANG_FLAGS "--cuda-path=${CUDA_TOOLKIT_ROOT_DIR}")
89 list(APPEND _CUDA_CLANG_FLAGS "${_CUDA_CLANG_GENCODE_FLAGS}")
90 foreach(_flag ${_CUDA_CLANG_FLAGS})
91 set(GMX_CUDA_CLANG_FLAGS "${GMX_CUDA_CLANG_FLAGS} ${_flag}")
94 if (CUDA_USE_STATIC_CUDA_RUNTIME)
95 set(GMX_CUDA_CLANG_LINK_LIBS "cudart_static")
97 set(GMX_CUDA_CLANG_LINK_LIBS "cudart")
99 set(GMX_CUDA_CLANG_LINK_LIBS "${GMX_CUDA_CLANG_LINK_LIBS}" "dl" "rt")
100 if (CUDA_64_BIT_DEVICE_CODE)
101 set(GMX_CUDA_CLANG_LINK_DIRS "${CUDA_TOOLKIT_ROOT_DIR}/lib64")
103 set(GMX_CUDA_CLANG_LINK_DIRS "${CUDA_TOOLKIT_ROOT_DIR}/lib")
106 gmx_test_clang_cuda_support()