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# We can't create the same interface imported target multiple times, CMake will complain if we do
# that. This can happen if the find_package call is done in multiple different subdirectories.
if(TARGET WrapAtomic::WrapAtomic)
set(WrapAtomic_FOUND ON)
return()
endif()
include(CheckCXXSourceCompiles)
set (atomic_test_sources "#include <atomic>
#include <cstdint>
void test(volatile std::atomic<std::int64_t> &a)
{
std::int64_t v = a.load(std::memory_order_acquire);
while (!a.compare_exchange_strong(v, v + 1,
std::memory_order_acq_rel,
std::memory_order_acquire)) {
v = a.exchange(v - 1);
}
a.store(v + 1, std::memory_order_release);
}
int main(int, char **)
{
void *ptr = (void*)0xffffffc0; // any random pointer
test(*reinterpret_cast<std::atomic<std::int64_t> *>(ptr));
return 0;
}")
check_cxx_source_compiles("${atomic_test_sources}" HAVE_STDATOMIC)
if(NOT HAVE_STDATOMIC)
set(_req_libraries "${CMAKE_REQUIRED_LIBRARIES}")
set(CMAKE_REQUIRED_LIBRARIES "atomic")
check_cxx_source_compiles("${atomic_test_sources}" HAVE_STDATOMIC_WITH_LIB)
set(CMAKE_REQUIRED_LIBRARIES "${_req_libraries}")
endif()
add_library(WrapAtomic::WrapAtomic INTERFACE IMPORTED)
if(HAVE_STDATOMIC_WITH_LIB)
target_link_libraries(WrapAtomic::WrapAtomic INTERFACE atomic)
endif()
set(WrapAtomic_FOUND 1)
include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(WrapAtomic DEFAULT_MSG WrapAtomic_FOUND)
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