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# Based on https://stackoverflow.com/q/69281559
if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU" OR "${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
include(CheckCXXSourceCompiles)
include(CMakePushCheckState)
set(ATOMIC32_TEST_CODE "
#include <atomic>
#include <stdint.h>
int main()
{
std::atomic<int32_t> x;
x.store(1);
x--;
return x.load();
}")
set(ATOMIC64_TEST_CODE "
#include <atomic>
#include <stdint.h>
int main()
{
std::atomic<int64_t> x;
x.store(1);
x--;
return x.load();
}")
# Attempt to compile the two atomic tests
set(CMAKE_REQUIRED_QUIET ON)
check_cxx_source_compiles("${ATOMIC32_TEST_CODE}" atomic32_test)
check_cxx_source_compiles("${ATOMIC64_TEST_CODE}" atomic64_test)
# If a test does not compile, look for the atomic library, link with it and try again
if(NOT atomic32_test OR NOT atomic64_test)
find_library(ATOMIC_LIBRARY
NAMES atomic atomic.so.1 libatomic.so.1
HINTS
${ATOMIC_ROOT}
$ENV{HOME}/local/lib64
$ENV{HOME}/local/lib
/usr/local/lib64
/usr/local/lib
/opt/local/lib64
/opt/local/lib
/usr/lib64
/usr/lib
/lib64
/lib
/usr/lib/arm-linux-gnueabihf
)
if(ATOMIC_LIBRARY)
message(STATUS "Atomic library found at: ${ATOMIC_LIBRARY}")
get_filename_component(ATOMIC_DIRECTORY ${ATOMIC_LIBRARY} DIRECTORY)
# Preserving current state before setting CMAKE_REQUIRED_LIBRARIES
cmake_push_check_state()
set(CMAKE_REQUIRED_LIBRARIES "-L${ATOMIC_DIRECTORY}" "-latomic")
check_cxx_source_compiles("${ATOMIC32_TEST_CODE}" atomic32_test_with_library)
check_cxx_source_compiles("${ATOMIC64_TEST_CODE}" atomic64_test_with_library)
cmake_pop_check_state()
if(NOT atomic32_test_with_library)
message(FATAL_ERROR "Can't compile the 32-bit atomic test after linking with the atomic library")
endif()
if(NOT atomic64_test_with_library)
message(FATAL_ERROR "Can't compile the 64-bit atomic test after linking with the atomic library")
endif()
set(ATOMIC_FOUND 1)
else()
message(FATAL_ERROR "Can't find the library required to compile atomic code")
endif()
endif()
set(CMAKE_REQUIRED_QUIET OFF)
endif()
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