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# Check if platform needs to explicitly specify linking with libatomic.
# It creates an interface target eProsima_atomic that will include the dependency if needed.
# The variable FASTDDS_REQUIRED_FLAGS can be used to pass specific compiler flags use in the build
# and that we want to mimick in the testing like --std=c++20
if(TARGET eProsima_atomic)
return()
endif()
set(Atomic_FOUND FALSE CACHE BOOL "The atomic module testing has already been performed")
set(ATOMIC_TEST_CODE
"#define _ENABLE_ATOMIC_ALIGNMENT_FIX
#include <atomic>
#include <cstdint>
std::atomic<bool> b;
int main()
{
using namespace std;
bool b2 = true;
volatile atomic_ullong i(0xcafebabedeadbeeful);
i += 0xfeedbadc0de8f00dul;
struct Pointer
{
uint32_t write_p;
uint32_t free_cells;
};
Pointer dummy{1,1};
atomic<Pointer> pointer;
pointer = dummy;
return !b.compare_exchange_strong(b2, false);
}"
)
include(CheckCXXSourceCompiles)
# Test linking without atomic
unset(ATOMIC_WITHOUT_LIB)
check_cxx_source_compiles(
"${ATOMIC_TEST_CODE}"
ATOMIC_WITHOUT_LIB
)
if(NOT ATOMIC_WITHOUT_LIB)
unset(ATOMIC_WITH_LIB)
set(CMAKE_REQUIRED_LIBRARIES -latomic)
# Test linking with atomic
check_cxx_source_compiles(
"${ATOMIC_TEST_CODE}"
ATOMIC_WITH_LIB
)
endif()
# add interface target associated (cannot be imported to avoid propagation on static libraries)
add_library(eProsima_atomic INTERFACE)
# Populate the interface target properties
if (ATOMIC_WITH_LIB)
# force to link to atomic when the dummy target is present
target_link_libraries(eProsima_atomic INTERFACE atomic)
elseif(NOT ATOMIC_WITHOUT_LIB)
message(FATAL_ERROR "Unable to create binaries with atomic dependencies")
endif()
# clean local variables
unset(ATOMIC_TEST_CODE)
unset(ATOMIC_WITH_LIB)
unset(ATOMIC_WITHOUT_LIB)
unset(HAVE_LIBATOMIC)
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