2019-04-01 08:16:35 +00:00
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# Taken from https://chromium.googlesource.com/chromium/llvm-project/libcxx/+/refs/heads/master/cmake/Modules/CheckLibcxxAtomic.cmake
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# Apache License v2.0 with LLVM Exceptions
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INCLUDE(CheckCXXSourceCompiles)
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# Sometimes linking against libatomic is required for atomic ops, if
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# the platform doesn't support lock-free atomics.
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function(check_cxx_atomics varname)
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set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS})
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2019-04-01 12:32:08 +00:00
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set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -std=c++11")
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2019-04-01 08:16:35 +00:00
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if (${LIBCXX_GCC_TOOLCHAIN})
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set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} --gcc-toolchain=${LIBCXX_GCC_TOOLCHAIN}")
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endif()
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if (CMAKE_C_FLAGS MATCHES -fsanitize OR CMAKE_CXX_FLAGS MATCHES -fsanitize)
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set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -fno-sanitize=all")
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endif()
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if (CMAKE_C_FLAGS MATCHES -fsanitize-coverage OR CMAKE_CXX_FLAGS MATCHES -fsanitize-coverage)
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set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -fno-sanitize-coverage=edge,trace-cmp,indirect-calls,8bit-counters")
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endif()
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check_cxx_source_compiles("
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#include <cstdint>
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2019-04-01 12:32:08 +00:00
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#include <boost/lockfree/queue.hpp>
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boost::lockfree::queue<uint32_t*> q;
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2019-04-01 08:16:35 +00:00
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int main(int, char**) {
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2019-04-01 12:32:08 +00:00
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uint32_t* a;
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uint32_t* b;
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q.push(a);
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q.pop(b);
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2019-04-01 08:16:35 +00:00
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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(check_cxx_atomics)
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2019-04-01 12:32:08 +00:00
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# Perform the check for 64bit atomics without libatomic.
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2019-04-01 08:16:35 +00:00
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check_cxx_atomics(LIBCXX_HAVE_CXX_ATOMICS_WITHOUT_LIB)
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# If not, check if the library exists, and atomics work with it.
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if(NOT LIBCXX_HAVE_CXX_ATOMICS_WITHOUT_LIB)
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2019-04-01 12:32:08 +00:00
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check_library_exists(atomic __atomic_fetch_add_8 "" LIBCXX_HAS_ATOMIC_LIB)
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2019-04-01 08:16:35 +00:00
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if(LIBCXX_HAS_ATOMIC_LIB)
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list(APPEND CMAKE_REQUIRED_LIBRARIES "atomic")
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check_cxx_atomics(LIBCXX_HAVE_CXX_ATOMICS_WITH_LIB)
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if (NOT LIBCXX_HAVE_CXX_ATOMICS_WITH_LIB)
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message(WARNING "Host compiler must support std::atomic!")
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endif()
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else()
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message(WARNING "Host compiler appears to require libatomic, but cannot find it.")
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endif()
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endif()
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