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Fix CMake CUDA documentation.

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This commit is contained in:
Markus Blatt 2020-04-29 13:28:23 +02:00
parent 2c7556d286
commit 2d32fde1c9
1 changed files with 7 additions and 12 deletions
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19
CMakeLists.txt
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@ -84,7 +84,7 @@ include ("${project}-prereqs")
# Make sure we are using the same compiler underneath
# NVCC as for the rest. In the case that NVCC does not support
# that compiler it will error out. Unfortunately this will only
# work CMake >= 3.8. We found no way to make FindCUDA.cmake error
# work for CMake >= 3.8. We found no way to make FindCUDA.cmake error
# out. It seems to ignore CMAKE_NVCC_FLAGS and CMAKE. Additionally
# our way of specifying cuda source files never worked for CMake
# version < 3.8. Hence we deactivate cuda for these versions.
@ -102,23 +102,18 @@ if(NOT CMAKE_DISABLE_FIND_PACKAGE_CUDA AND
"prevent incompatibilities. Note that this might report that there "
"is not CUDA compiler if your system's CUDA compiler does not support "
"${CMAKE_CXX_COMPILER}.")
# set(CMAKE_CUDA_FLAGS "-ccbin ${CMAKE_CXX_COMPILER} ${CMAKE_CUDA_FLAGS}")
# check_language does not seem to care about ${CMAKE_CUDA_FLAGS}.
# Hence set(CMAKE_CUDA_FLAGS$(_flags_suffix) "-ccbin ${CMAKE_CXX_COMPILER} ${CMAKE_CUDA_FLAGS${_flags_suffix}}")
# would have no effect. We need to set the environment variable ENV{CUDAHOSTCXX} such
# that cuda picks up the correct compiler during check_language.
# In check_language(CUDA) we will get and error if we set and put
# "-ccbin ${CMAKE_CXX_COMPILER}" into the CMAKE_CUDA_FLAGS as this results
# check_language does not seem to care about ${CMAKE_CUDA_FLAGS} or $(CUDA_NVCC_FLAGS}.
# Hence we set CMAKE_CUDA_HOST_COMPILER to our C++ compiler.
# In check_language(CUDA) we will get an error if we in addition put
# "-ccbin ${CMAKE_CXX_COMPILER}" into CMAKE_CUDA_FLAGS. It results
# in "${NVCC} -ccbin=${CMAKE_CXX_COMPILER} -ccbin ${CMAKE_CXX_COMPILER}"
# which causes nvcc to abort
set(CMAKE_CUDA_HOST_COMPILER ${CMAKE_CXX_COMPILER})
endif()
include(CheckLanguage)
# Unfortunately check_language(CUDA) will only check whether there is
# a nvcc compiler. It will not check whether compilation with the above
# option works. Since the OPTIONAL flag of enable_language is currently
# ignored CMake will error out below if the options do not work.
check_language(CUDA)
if(CMAKE_CUDA_COMPILER)
# OPTIONAL is ignored. Hence the magic above to check whether enabling CUDA works
enable_language(CUDA OPTIONAL)
# While the documentation says that it is deprecated, FindCUDA seems the
# only easy way to determine the cublas and cusparse libraries.