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CheckLanguage: Report CMAKE_CUDA_HOST_COMPILER if needed for compilation

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Fixes: #19013
This commit is contained in:
Robert Maynard
2019-05-31 08:39:16 -04:00
committed by Brad King
parent 22d58e07e5
commit fada8cbfd6
2 changed files with 25 additions and 5 deletions
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27
Modules/CheckLanguage.cmake
View File

@@ -18,7 +18,9 @@ such as ``Fortran``. If :variable:`CMAKE_<LANG>_COMPILER` is already defined
the check does nothing. Otherwise it tries enabling the language in a
test project. The result is cached in :variable:`CMAKE_<LANG>_COMPILER`
as the compiler that was found, or ``NOTFOUND`` if the language cannot be
enabled.
enabled. For CUDA which can have an explicit host compiler, the cache
:variable:`CMAKE_CUDA_HOST_COMPILER` variable will be set if it was required
for compilation.
Example:
@@ -39,13 +41,23 @@ macro(check_language lang)
set(_desc "Looking for a ${lang} compiler")
message(STATUS ${_desc})
file(REMOVE_RECURSE ${CMAKE_CURRENT_BINARY_DIR}/CMakeFiles/Check${lang})
file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/CMakeFiles/Check${lang}/CMakeLists.txt"
set(extra_compiler_variables)
if(lang STREQUAL CUDA)
set(extra_compiler_variables "set(CMAKE_CUDA_HOST_COMPILER \\\"\${CMAKE_CUDA_HOST_COMPILER}\\\")")
endif()
set(content
"cmake_minimum_required(VERSION ${CMAKE_VERSION})
project(Check${lang} ${lang})
file(WRITE \"\${CMAKE_CURRENT_BINARY_DIR}/result.cmake\"
\"set(CMAKE_${lang}_COMPILER \\\"\${CMAKE_${lang}_COMPILER}\\\")\\n\"
)
")
\"${extra_compiler_variables}\\n\"
)"
)
file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/CMakeFiles/Check${lang}/CMakeLists.txt"
"${content}")
if(CMAKE_GENERATOR_INSTANCE)
set(_D_CMAKE_GENERATOR_INSTANCE "-DCMAKE_GENERATOR_INSTANCE:INTERNAL=${CMAKE_GENERATOR_INSTANCE}")
else()
@@ -75,5 +87,12 @@ file(WRITE \"\${CMAKE_CURRENT_BINARY_DIR}/result.cmake\"
message(STATUS "${_desc} - ${CMAKE_${lang}_COMPILER}")
set(CMAKE_${lang}_COMPILER "${CMAKE_${lang}_COMPILER}" CACHE FILEPATH "${lang} compiler")
mark_as_advanced(CMAKE_${lang}_COMPILER)
if(CMAKE_${lang}_HOST_COMPILER)
message(STATUS "Looking for a ${lang} host compiler - ${CMAKE_${lang}_HOST_COMPILER}")
set(CMAKE_${lang}_HOST_COMPILER "${CMAKE_${lang}_HOST_COMPILER}" CACHE FILEPATH "${lang} host compiler")
mark_as_advanced(CMAKE_${lang}_HOST_COMPILER)
endif()
endif()
endmacro()

3
Tests/CMakeOnly/CheckLanguage/CMakeLists.txt
View File

@@ -7,7 +7,8 @@ set(expect_C 1)
set(expect_CXX 1)
unset(expect_Fortran)
set(expect_NoSuchLanguage 0)
foreach(lang C CXX Fortran NoSuchLanguage)
foreach(lang C CXX Fortran CUDA NoSuchLanguage)
check_language(${lang})
if(NOT DEFINED CMAKE_${lang}_COMPILER)
message(FATAL_ERROR "check_language(${lang}) did not set result")