2021-10-15 00:05:34 +00:00
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function(check_working_cxx_atomics64 varname)
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set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS})
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if (EMBEDDED_CFG)
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set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -m32 -march=i486")
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elseif(MSVC OR MSVC_VERSION)
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set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -arch:IA32 -std:c++14")
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else()
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# CMAKE_CXX_STANDARD does not propagate to cmake compile tests
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set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -std=c++14")
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endif()
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check_cxx_source_compiles("
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#include <atomic>
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#include <cstdint>
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std::atomic<uint64_t> x (0);
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int main() {
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uint64_t i = x.load(std::memory_order_relaxed);
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return 0;
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}
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" ${varname})
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set(CMAKE_REQUIRED_FLAGS ${OLD_CMAKE_REQUIRED_FLAGS})
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endfunction()
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function(link_libatomic)
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check_working_cxx_atomics64(HAVE_CXX_ATOMICS64_WITHOUT_LIB)
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if(HAVE_CXX_ATOMICS64_WITHOUT_LIB)
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message(STATUS "Have working 64bit atomics")
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return()
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endif()
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if (NOT MSVC AND NOT MSVC_VERSION)
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check_library_exists(atomic __atomic_load_8 "" HAVE_CXX_LIBATOMICS64)
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if (HAVE_CXX_LIBATOMICS64)
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message(STATUS "Have 64bit atomics via library")
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list(APPEND CMAKE_REQUIRED_LIBRARIES "atomic")
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check_working_cxx_atomics64(HAVE_CXX_ATOMICS64_WITH_LIB)
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if (HAVE_CXX_ATOMICS64_WITH_LIB)
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message(STATUS "Can link with libatomic")
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link_libraries(-latomic)
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return()
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endif()
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endif()
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endif()
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if (MSVC OR MSVC_VERSION)
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message(FATAL_ERROR "Host compiler must support 64-bit std::atomic! (What does MSVC do to inline atomics?)")
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else()
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message(FATAL_ERROR "Host compiler must support 64-bit std::atomic!")
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endif()
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endfunction()
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