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35 # Manage CUDA nvcc compilation configuration, try to be smart to ease the users'
36 # pain as much as possible:
37 # - use the CUDA_HOST_COMPILER if defined by the user, otherwise
38 # - auto-detect compatible nvcc host compiler and set nvcc -ccbin (if not MPI wrapper)
39 # - set icc compatibility mode to gcc 4.8.1
40 # - (advanced) variables set:
41 # * CUDA_HOST_COMPILER - the host compiler for nvcc (only with cmake <2.8.10)
42 # * CUDA_HOST_COMPILER_OPTIONS - the full host-compiler related option list passed to nvcc
44 # Note that from CMake 2.8.10 FindCUDA defines CUDA_HOST_COMPILER internally,
45 # so we won't set it ourselves, but hope that the module does a good job.
47 gmx_check_if_changed(CUDA_HOST_COMPILER_CHANGED CUDA_HOST_COMPILER)
49 # CUDA_HOST_COMPILER changed hence it is not auto-set anymore
50 if (CUDA_HOST_COMPILER_CHANGED AND CUDA_HOST_COMPILER_AUTOSET)
51 unset(CUDA_HOST_COMPILER_AUTOSET CACHE)
54 # Set the host compiler for nvcc if this is not set by CMake (v<=2.8.9)
56 # Note that even though nvcc compiles host code as C++, we use the
57 # CMAKE_C_COMPILER as host compiler. We do this because CUDA versions
58 # preceding 5.0 only recognize icc, but not icpc. However, both gcc and icc
59 # (i.e. all supported compilers) happily compile C++ code.
61 # Also note that with MSVC nvcc sets the -compiler-bindir option behind the
62 # scenes; to avoid conflicts we don't set -ccbin automatically.
64 # TODO: remove this when CMAke >=v2.8.10 is required.
65 if (NOT DEFINED CUDA_HOST_COMPILER AND NOT MSVC)
66 set(CUDA_HOST_COMPILER "${CMAKE_C_COMPILER}")
67 set(CUDA_HOST_COMPILER_AUTOSET TRUE CACHE INTERNAL
68 "True if CUDA_HOST_COMPILER is automatically set")
71 # glibc 2.23 changed string.h in a way that breaks CUDA compilation in
72 # many projects, but which has a trivial workaround. It would be nicer
73 # to compile with nvcc and see that the workaround is necessary and
74 # effective, but it is unclear how to do that. Also, grepping in the
75 # glibc source shows that _FORCE_INLINES is only used in this string.h
76 # feature and performance of memcpy variants is unimportant for CUDA
77 # code in GROMACS. So this workaround is good enough to keep problems
78 # away from users installing GROMACS. See Redmine 1942.
79 function(work_around_glibc_2_23)
80 try_compile(IS_GLIBC_2_23_OR_HIGHER ${CMAKE_BINARY_DIR} ${CMAKE_SOURCE_DIR}/cmake/TestGlibcVersion.cpp)
81 if(IS_GLIBC_2_23_OR_HIGHER)
82 message(STATUS "Adding work-around for issue compiling CUDA code with glibc 2.23 string.h")
83 list(APPEND CUDA_HOST_COMPILER_OPTIONS "-D_FORCE_INLINES")
84 set(CUDA_HOST_COMPILER_OPTIONS ${CUDA_HOST_COMPILER_OPTIONS} PARENT_SCOPE)
88 # set up host compiler and its options
89 if(CUDA_HOST_COMPILER_CHANGED)
90 set(CUDA_HOST_COMPILER_OPTIONS "")
92 if(APPLE AND CMAKE_C_COMPILER_ID MATCHES "GNU")
93 # Some versions of gcc-4.8 and gcc-4.9 produce errors (in particular on OS X)
94 # if we do not use -D__STRICT_ANSI__. It is harmless, so we might as well add it for all versions.
95 list(APPEND CUDA_HOST_COMPILER_OPTIONS "-D__STRICT_ANSI__")
98 work_around_glibc_2_23()
100 set(CUDA_HOST_COMPILER_OPTIONS "${CUDA_HOST_COMPILER_OPTIONS}"
101 CACHE STRING "Options for nvcc host compiler (do not edit!).")
103 mark_as_advanced(CUDA_HOST_COMPILER CUDA_HOST_COMPILER_OPTIONS)
106 # If any of these manual override variables for target CUDA GPU architectures
107 # or virtual architecture is set, parse the values and assemble the nvcc
108 # command line for these. Otherwise use our defaults.
109 # Note that the manual override variables require a semicolon separated
110 # architectures codes.
111 if (GMX_CUDA_TARGET_SM OR GMX_CUDA_TARGET_COMPUTE)
112 set(GMX_CUDA_NVCC_GENCODE_FLAGS)
113 set(_target_sm_list ${GMX_CUDA_TARGET_SM})
114 foreach(_target ${_target_sm_list})
115 list(APPEND GMX_CUDA_NVCC_GENCODE_FLAGS "-gencode;arch=compute_${_target},code=sm_${_target}")
117 set(_target_compute_list ${GMX_CUDA_TARGET_COMPUTE})
118 foreach(_target ${_target_compute_list})
119 list(APPEND GMX_CUDA_NVCC_GENCODE_FLAGS "-gencode;arch=compute_${_target},code=compute_${_target}")
122 # Set the CUDA GPU architectures to compile for:
123 # - with CUDA >=5.0 <6.5: CC <=3.5 is supported
124 # => compile sm_20, sm_30, sm_35 SASS, and compute_35 PTX
125 # - with CUDA ==6.5: CC <=3.7 and 5.0 are supported
126 # => compile sm_20, sm_30, sm_35, sm_37 sm_50, SASS, and compute_50 PTX
127 # - with CUDA >=7.0 CC 5.2 is supported (5.3, Tegra X1 we don't generate code for)
128 # => compile sm_20, sm_30, sm_35, sm_37, sm_50, & sm_52 SASS, and compute_52 PTX
129 # - with CUDA >=8.0 CC 6.0-6.2 is supported (but we know nothing about CC 6.2, so we won't generate code or it)
130 # => compile sm_20, sm_30, sm_35, sm_37, sm_50, sm_52, sm_60, sm_61 SASS, and compute_60 and compute_61 PTX
133 # Note that CUDA 6.5.19 second patch release supports cc 5.2 too, but
134 # CUDA_VERSION does not contain patch version and having PTX 5.0 JIT-ed is
135 # equally fast as compiling with sm_5.2 anyway.
137 # First add flags that trigger SASS (binary) code generation for physical arch
138 list (APPEND GMX_CUDA_NVCC_GENCODE_FLAGS "-gencode;arch=compute_20,code=sm_20")
139 list (APPEND GMX_CUDA_NVCC_GENCODE_FLAGS "-gencode;arch=compute_30,code=sm_30")
140 list (APPEND GMX_CUDA_NVCC_GENCODE_FLAGS "-gencode;arch=compute_35,code=sm_35")
142 if(NOT CUDA_VERSION VERSION_LESS "6.5") # >= 6.5
143 list (APPEND GMX_CUDA_NVCC_GENCODE_FLAGS "-gencode;arch=compute_37,code=sm_37")
144 list (APPEND GMX_CUDA_NVCC_GENCODE_FLAGS "-gencode;arch=compute_50,code=sm_50")
146 if(NOT CUDA_VERSION VERSION_LESS "7.0") # >= 7.0
147 list (APPEND GMX_CUDA_NVCC_GENCODE_FLAGS "-gencode;arch=compute_52,code=sm_52")
149 if(NOT CUDA_VERSION VERSION_LESS "8.0") # >= 8.0
150 list (APPEND GMX_CUDA_NVCC_GENCODE_FLAGS "-gencode;arch=compute_60,code=sm_60")
151 list (APPEND GMX_CUDA_NVCC_GENCODE_FLAGS "-gencode;arch=compute_61,code=sm_61")
154 # Next add flags that trigger PTX code generation for the newest supported virtual arch
155 # that's useful to JIT to future architectures
156 if(CUDA_VERSION VERSION_LESS "6.5")
157 list (APPEND GMX_CUDA_NVCC_GENCODE_FLAGS "-gencode;arch=compute_35,code=compute_35")
158 elseif(CUDA_VERSION VERSION_LESS "7.0")
159 list (APPEND GMX_CUDA_NVCC_GENCODE_FLAGS "-gencode;arch=compute_50,code=compute_50")
160 elseif(CUDA_VERSION VERSION_LESS "8.0")
161 list (APPEND GMX_CUDA_NVCC_GENCODE_FLAGS "-gencode;arch=compute_52,code=compute_52")
162 else() # version >= 8.0
163 list (APPEND GMX_CUDA_NVCC_GENCODE_FLAGS "-gencode;arch=compute_60,code=compute_60")
164 list (APPEND GMX_CUDA_NVCC_GENCODE_FLAGS "-gencode;arch=compute_61,code=compute_61")
168 gmx_dependent_cache_variable(GMX_CUDA_TARGET_SM "List of CUDA GPU architecture codes to compile for (without the sm_ prefix)" STRING "" GMX_CUDA_TARGET_SM)
169 gmx_dependent_cache_variable(GMX_CUDA_TARGET_COMPUTE "List of CUDA virtual architecture codes to compile for (without the compute_ prefix)" STRING "" GMX_CUDA_TARGET_COMPUTE)
171 # assemble the CUDA flags
172 list(APPEND GMX_CUDA_NVCC_FLAGS "${GMX_CUDA_NVCC_GENCODE_FLAGS}")
173 list(APPEND GMX_CUDA_NVCC_FLAGS "-use_fast_math")
175 # assemble the CUDA host compiler flags
176 list(APPEND GMX_CUDA_NVCC_FLAGS "${CUDA_HOST_COMPILER_OPTIONS}")
178 # The flags are set as local variables which shadow the cache variables. The cache variables
179 # (can be set by the user) are appended. This is done in a macro to set the flags when all
180 # host compiler flags are already set.
181 macro(GMX_SET_CUDA_NVCC_FLAGS)
182 set(CUDA_NVCC_FLAGS "${GMX_CUDA_NVCC_FLAGS};${CUDA_NVCC_FLAGS}")