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https://github.com/ceph/ceph
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39 lines
1014 B
CMake
39 lines
1014 B
CMake
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# some platforms do not offer support for atomic primitive for all integer
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# types, in that case we need to link against libatomic
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include(CheckCXXSourceCompiles)
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include(CMakePushCheckState)
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function(check_cxx_atomics var)
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set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -std=c++11")
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check_cxx_source_compiles("
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#include <atomic>
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#include <cstdint>
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int main() {
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std::atomic<uint8_t> w1;
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std::atomic<uint16_t> w2;
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std::atomic<uint32_t> w4;
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std::atomic<uint64_t> w8;
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return w1 + w2 + w4 + w8;
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}
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" ${var})
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endfunction(check_cxx_atomics)
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cmake_push_check_state()
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check_cxx_atomics(HAVE_CXX11_ATOMIC)
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cmake_pop_check_state()
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if(NOT HAVE_CXX11_ATOMIC)
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cmake_push_check_state()
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set(CMAKE_REQUIRED_LIBRARIES "atomic")
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check_cxx_atomics(HAVE_LIBATOMIC)
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cmake_pop_check_state()
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if(HAVE_LIBATOMIC)
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set(LIBATOMIC_LINK_FLAGS "-Wl,--as-needed -latomic")
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else()
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message(FATAL_ERROR
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"Host compiler ${CMAKE_CXX_COMPILER} requires libatomic, but it is not found")
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endif()
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endif()
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