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# Simple check to see if we need a library for std::atomic
if(TARGET std::atomic)
return()
endif()
cmake_minimum_required(VERSION 3.10)
include(CMakePushCheckState)
include(CheckIncludeFileCXX)
include(CheckCXXSourceRuns)
cmake_push_check_state()
check_include_file_cxx("atomic" _CXX_ATOMIC_HAVE_HEADER)
mark_as_advanced(_CXX_ATOMIC_HAVE_HEADER)
set(code [[
#include <atomic>
int main(int argc, char** argv) {
std::atomic<long long> s;
++s;
return 0;
}
]])
check_cxx_source_runs("${code}" _CXX_ATOMIC_BUILTIN)
if(_CXX_ATOMIC_BUILTIN)
set(_found 1)
else()
list(APPEND CMAKE_REQUIRED_LIBRARIES atomic)
list(APPEND FOLLY_LINK_LIBRARIES atomic)
check_cxx_source_runs("${code}" _CXX_ATOMIC_LIB_NEEDED)
if (NOT _CXX_ATOMIC_LIB_NEEDED)
message(FATAL_ERROR "unable to link C++ std::atomic code: you may need \
to install GNU libatomic")
else()
set(_found 1)
endif()
endif()
if(_found)
add_library(std::atomic INTERFACE IMPORTED)
set_property(TARGET std::atomic APPEND PROPERTY INTERFACE_COMPILE_FEATURES cxx_std_14)
if(_CXX_ATOMIC_BUILTIN)
# Nothing to add...
elseif(_CXX_ATOMIC_LIB_NEEDED)
set_target_properties(std::atomic PROPERTIES IMPORTED_LIBNAME atomic)
set(STDCPPATOMIC_LIBRARY atomic)
endif()
endif()
cmake_pop_check_state()
set(Atomic_FOUND ${_found} CACHE BOOL "TRUE if we can run a program using std::atomic" FORCE)
mark_as_advanced(Atomic_FOUND)
if(Atomic_FIND_REQUIRED AND NOT Atomic_FOUND)
message(FATAL_ERROR "Cannot run simple program using std::atomic")
endif()
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