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47 lines
1.9 KiB
47 lines
1.9 KiB
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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# |
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# We could modify LLVM's CheckAtomic module and have it check for 64-bit |
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# atomics instead. However, we would like to avoid careless uses of 64-bit |
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# atomics inside LLVM over time on 32-bit platforms. |
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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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set(CMAKE_REQUIRED_FLAGS "-nodefaultlibs -std=c++11 -nostdinc++ -isystem ${LIBCXX_SOURCE_DIR}/include") |
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if (${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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#include <atomic> |
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std::atomic<uintptr_t> x; |
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std::atomic<uintmax_t> y; |
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int main() { |
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return x + y; |
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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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check_cxx_atomics(LIBCXX_HAVE_CXX_ATOMICS_WITHOUT_LIB) |
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check_library_exists(atomic __atomic_fetch_add_8 "" LIBCXX_HAS_ATOMIC_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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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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