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55 lines
1.6 KiB
CMake
55 lines
1.6 KiB
CMake
# Copyright (C) 2022 The Qt Company Ltd.
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# SPDX-License-Identifier: BSD-3-Clause
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# We can't create the same interface imported target multiple times, CMake will complain if we do
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# that. This can happen if the find_package call is done in multiple different subdirectories.
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if(TARGET WrapAtomic::WrapAtomic)
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set(WrapAtomic_FOUND ON)
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return()
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endif()
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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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int main(int, char **)
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{
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volatile std::atomic<char> size_1;
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volatile std::atomic<short> size_2;
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volatile std::atomic<int> size_4;
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volatile std::atomic<int64_t> size_8;
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++size_1;
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++size_2;
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++size_4;
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++size_8;
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(void)size_1.load(std::memory_order_relaxed);
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(void)size_2.load(std::memory_order_relaxed);
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(void)size_4.load(std::memory_order_relaxed);
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(void)size_8.load(std::memory_order_relaxed);
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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_REQUIRED_LIBRARIES}")
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set(atomic_LIB "-latomic")
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set(CMAKE_REQUIRED_LIBRARIES ${atomic_LIB})
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check_cxx_source_compiles("${atomic_test_sources}" HAVE_STDATOMIC_WITH_LIB)
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set(CMAKE_REQUIRED_LIBRARIES "${_req_libraries}")
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endif()
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add_library(WrapAtomic::WrapAtomic INTERFACE IMPORTED)
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if(HAVE_STDATOMIC_WITH_LIB)
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# atomic_LIB is already found above.
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target_link_libraries(WrapAtomic::WrapAtomic INTERFACE ${atomic_LIB})
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endif()
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set(WrapAtomic_FOUND 1)
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include(FindPackageHandleStandardArgs)
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find_package_handle_standard_args(WrapAtomic DEFAULT_MSG WrapAtomic_FOUND)
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