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#
# Copyright © 2021 pastdue ( https://github.com/past-due/ ) and contributors
# License: MIT License ( https://opensource.org/licenses/MIT )
#
# Script Version: 2021-05-21a
#
INCLUDE(CheckCXXSourceRuns)
INCLUDE(CheckCXXSourceCompiles)
# CHECK_CXX_STD_THREAD( <_RESULT>
# [QUIET] )
#
# CHECK_CXX_STD_THREAD checks if std::thread seems to be supported by the current (specified) compiler + linker.
#
function(CHECK_CXX_STD_THREAD _RESULT)
set(_options QUIET)
set(_oneValueArgs)
set(_multiValueArgs)
CMAKE_PARSE_ARGUMENTS(_parsedArguments "${_options}" "${_oneValueArgs}" "${_multiValueArgs}" ${ARGN})
set(_check_cached_status)
if(DEFINED "${_RESULT}")
set(_check_cached_status " (cached)")
endif()
find_package(Threads QUIET)
if (TARGET Threads::Threads)
set(CMAKE_REQUIRED_LIBRARIES "Threads::Threads")
endif()
if(_parsedArguments_QUIET)
set(CMAKE_REQUIRED_QUIET OFF)
endif()
set(_test_source
"#include<thread>\n \
void foo() { /* do nothing */ }\n \
int main() {\n \
std::thread a (foo);\n \
a.join();\n \
return 0;\n \
}"
)
if(NOT CMAKE_CROSSCOMPILING AND NOT CMAKE_GENERATOR_PLATFORM)
CHECK_CXX_SOURCE_RUNS("${_test_source}" ${_RESULT})
else()
CHECK_CXX_SOURCE_COMPILES("${_test_source}" ${_RESULT})
endif()
if(_parsedArguments_QUIET)
unset(CMAKE_REQUIRED_QUIET)
endif()
if(NOT _parsedArguments_QUIET)
if(${_RESULT})
message( STATUS "std::thread support... YES${_check_cached_status}" )
else()
message( STATUS "std::thread support... no${_check_cached_status}" )
endif()
endif()
set(CMAKE_REQUIRED_LIBRARIES "")
endfunction(CHECK_CXX_STD_THREAD)
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