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# Check if std::atomic needs -latomic
set(LIBATOMIC_STATIC_PATH "" CACHE PATH "Directory containing static libatomic.a")
include(CheckCXXSourceCompiles)
set(
check_std_atomic_source_code
[=[
#include <atomic>
int main()
{
std::atomic<long long> x;
++x;
(void)x.load();
return 0;
}
]=])
check_cxx_source_compiles("${check_std_atomic_source_code}" std_atomic_without_libatomic)
if(NOT std_atomic_without_libatomic)
set(CMAKE_REQUIRED_LIBRARIES atomic)
check_cxx_source_compiles("${check_std_atomic_source_code}" std_atomic_with_libatomic)
set(CMAKE_REQUIRED_LIBRARIES)
if(NOT std_atomic_with_libatomic)
message(FATAL_ERROR "Toolchain doesn't support std::atomic with nor without -latomic")
else()
if(STATIC_LINK)
find_library(ATOMIC_STATIC NAMES libatomic.a PATHS /usr/lib /usr/local/lib ${LIBATOMIC_STATIC_PATH} NO_DEFAULT_PATH)
if(ATOMIC_STATIC)
message(STATUS "Linking static libatomic: ${ATOMIC_STATIC}")
target_link_libraries(standard_settings INTERFACE ${ATOMIC_STATIC})
else()
message(WARNING "STATIC_LINK is set but static libatomic not found; falling back to -latomic")
target_link_libraries(standard_settings INTERFACE atomic)
endif()
else()
target_link_libraries(standard_settings INTERFACE atomic)
endif()
endif()
endif()
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