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# check for atomic library, which is needed on some architectures
include(CheckCXXSourceCompiles)
function(check_cxx_atomic_compiles varname)
check_cxx_source_compiles("
#include <atomic>
std::atomic<bool> x;
int main() {
bool y = false;
return !x.compare_exchange_strong(y, true);
}" ${varname})
endfunction()
function(check_working_cxx_atomic varname)
check_cxx_atomic_compiles(${varname}_NOFLAG)
if(${varname}_NOFLAG)
set(${varname} TRUE PARENT_SCOPE)
return()
endif()
set(old_CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS}")
list(APPEND CMAKE_REQUIRED_FLAGS "-std=c++11")
check_cxx_atomic_compiles(${varname}_STD11)
set(CMAKE_REQUIRED_FLAGS "${old_CMAKE_REQUIRED_FLAGS}")
if(${varname}_STD11)
set(${varname} TRUE PARENT_SCOPE)
return()
endif()
list(APPEND CMAKE_REQUIRED_FLAGS "-std=c++0x")
check_cxx_atomic_compiles(${varname}_STD0X)
set(CMAKE_REQUIRED_FLAGS "${old_CMAKE_REQUIRED_FLAGS}")
if(${varname}_STD0X)
set(${varname} TRUE PARENT_SCOPE)
return()
endif()
set(${varname} FALSE PARENT_SCOPE)
endfunction()
check_working_cxx_atomic(HAVE_CXX_ATOMIC)
if(NOT HAVE_CXX_ATOMIC)
set(old_CMAKE_REQUIRED_LIBRARIES "${CMAKE_REQUIRED_LIBRARIES}")
list(APPEND CMAKE_REQUIRED_LIBRARIES "-latomic")
check_working_cxx_atomic(NEED_LIBRARY_FOR_CXX_ATOMIC)
set(CMAKE_REQUIRED_LIBRARIES "${old_CMAKE_REQUIRED_LIBRARIES}")
if(NOT NEED_LIBRARY_FOR_CXX_ATOMIC)
message(FATAL_ERROR "Host compiler does not support std::atomic")
endif()
endif()
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