diff options
author | Simon Hausmann <simon.hausmann@qt.io> | 2018-10-24 15:20:27 +0200 |
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committer | Tobias Hunger <tobias.hunger@qt.io> | 2018-11-01 11:48:46 +0000 |
commit | e9c45bbdddd4df005bdaa5eea9740d351e6eaea2 (patch) | |
tree | 23765d4650f8f349d1f32e0fe4b1bc678cae7568 /cmake/FindAtomic.cmake | |
parent | 345e6b0213b1273b698163064f80d33bc7ce64a9 (diff) |
Begin port of qtbase to CMake
Done-by: Alexandru Croitor <alexandru.croitor@qt.io>
Done-by: Frederik Gladhorn <frederik.gladhorn@qt.io>
Done-by: Kevin Funk <kevin.funk@kdab.com>
Done-by: Mikhail Svetkin <mikhail.svetkin@qt.io>
Done-by: Simon Hausmann <simon.hausmann@qt.io>
Done-by: Tobias Hunger <tobias.hunger@qt.io>
Done-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>
Done-by: Volker Krause <volker.krause@kdab.com>
Change-Id: Ida4f8bd190f9a4849a1af7b5b7981337a5df5310
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>
Reviewed-by: Tobias Hunger <tobias.hunger@qt.io>
Reviewed-by: Mikhail Svetkin <mikhail.svetkin@qt.io>
Diffstat (limited to 'cmake/FindAtomic.cmake')
-rw-r--r-- | cmake/FindAtomic.cmake | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/cmake/FindAtomic.cmake b/cmake/FindAtomic.cmake new file mode 100644 index 0000000000..6676378686 --- /dev/null +++ b/cmake/FindAtomic.cmake @@ -0,0 +1,37 @@ +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_REQUIRE_LIBRARIES}") + set(CMAKE_REQUIRE_LIBRARIES "atomic") + check_cxx_source_compiles("${atomic_test_sources}" HAVE_STDATOMIC_WITH_LIB) + set(CMAKE_REQUIRE_LIBRARIES "${_req_libraries}") +endif() + +add_library(Atomic INTERFACE) +if(HAVE_STDATOMIC_WITH_LIB) + target_link_libraries(Atomic INTERFACE atomic) +endif() + +set(Atomic_FOUND 1) |