38 lines
1.1 KiB
CMake
38 lines
1.1 KiB
CMake
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include(CheckCXXSourceCompiles)
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set (atomic_test_sources "#include <atomic>
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#include <cstdint>
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void test(volatile std::atomic<std::int64_t> &a)
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{
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std::int64_t v = a.load(std::memory_order_acquire);
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while (!a.compare_exchange_strong(v, v + 1,
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std::memory_order_acq_rel,
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std::memory_order_acquire)) {
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v = a.exchange(v - 1);
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}
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a.store(v + 1, std::memory_order_release);
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}
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int main(int, char **)
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{
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void *ptr = (void*)0xffffffc0; // any random pointer
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test(*reinterpret_cast<std::atomic<std::int64_t> *>(ptr));
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return 0;
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}")
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check_cxx_source_compiles("${atomic_test_sources}" HAVE_STDATOMIC)
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if(NOT HAVE_STDATOMIC)
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set(_req_libraries "${CMAKE_REQUIRE_LIBRARIES}")
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set(CMAKE_REQUIRE_LIBRARIES "atomic")
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check_cxx_source_compiles("${atomic_test_sources}" HAVE_STDATOMIC_WITH_LIB)
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set(CMAKE_REQUIRE_LIBRARIES "${_req_libraries}")
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endif()
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add_library(Atomic INTERFACE)
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if(HAVE_STDATOMIC_WITH_LIB)
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target_link_libraries(Atomic INTERFACE atomic)
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endif()
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set(Atomic_FOUND 1)
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