diff --git a/cmake/modules/findATOMIC.cmake b/cmake/modules/findATOMIC.cmake new file mode 100644 index 000000000..1669983c3 --- /dev/null +++ b/cmake/modules/findATOMIC.cmake @@ -0,0 +1,36 @@ +include(CheckCXXSourceCompiles) + +set(ATOMIC_CXX_TEST_SOURCE +" +#include +int main() { + std::atomic b(false); + std::atomic i(0); + std::atomic ui(0); + b.exchange(true); + ++i; + return ++ui; +} +") + +set(SAFE_CMAKE_REQUIRED_LIBRARIES "${CMAKE_REQUIRED_LIBRARIES}") +list(REMOVE_ITEM CMAKE_REQUIRED_LIBRARIES "atomic") + +check_cxx_source_compiles("${ATOMIC_CXX_TEST_SOURCE}" HAVE_CXX_ATOMICS_WITHOUT_LIB) + +if(NOT HAVE_CXX_ATOMICS_WITHOUT_LIB) + list(APPEND CMAKE_REQUIRED_LIBRARIES "atomic") + check_cxx_source_compiles("${ATOMIC_CXX_TEST_SOURCE}" HAVE_CXX_ATOMICS_WITH_LIB) + if (NOT HAVE_CXX_ATOMICS_WITH_LIB) + message(FATAL_ERROR "libatomic support needed for std::atomic<> but not +found.") + endif() + set(ATOMIC_LIBRARIES "atomic") + set(ATOMIC_FOUND ON) +endif() + +set(CMAKE_REQUIRED_LIBRARIES "${SAFE_CMAKE_REQUIRED_LIBRARIES}") +unset(SAFE_CMAKE_REQUIRED_LIBRARIES) + +mark_as_advanced(ATOMIC_LIBRARIES) +mark_as_advanced(ATOMIC_FOUND)