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https://github.com/PDB-REDO/libcifpp.git
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64 lines
1.5 KiB
CMake
64 lines
1.5 KiB
CMake
# Simple check to see if we need a library for std::atomic
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if(TARGET std::atomic)
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return()
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endif()
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cmake_minimum_required(VERSION 3.10)
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include(CMakePushCheckState)
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include(CheckIncludeFileCXX)
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include(CheckCXXSourceRuns)
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cmake_push_check_state()
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check_include_file_cxx("atomic" _CXX_ATOMIC_HAVE_HEADER)
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mark_as_advanced(_CXX_ATOMIC_HAVE_HEADER)
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set(code [[
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#include <atomic>
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int main(int argc, char** argv) {
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std::atomic<long long> s;
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++s;
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return 0;
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}
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]])
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check_cxx_source_runs("${code}" _CXX_ATOMIC_BUILTIN)
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if(_CXX_ATOMIC_BUILTIN)
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set(_found 1)
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else()
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list(APPEND CMAKE_REQUIRED_LIBRARIES atomic)
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list(APPEND FOLLY_LINK_LIBRARIES atomic)
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check_cxx_source_runs("${code}" _CXX_ATOMIC_LIB_NEEDED)
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if (NOT _CXX_ATOMIC_LIB_NEEDED)
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message(FATAL_ERROR "unable to link C++ std::atomic code: you may need \
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to install GNU libatomic")
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else()
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set(_found 1)
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endif()
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endif()
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if(_found)
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add_library(std::atomic INTERFACE IMPORTED)
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set_property(TARGET std::atomic APPEND PROPERTY INTERFACE_COMPILE_FEATURES cxx_std_14)
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if(_CXX_ATOMIC_BUILTIN)
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# Nothing to add...
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elseif(_CXX_ATOMIC_LIB_NEEDED)
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set_target_properties(std::atomic PROPERTIES IMPORTED_LIBNAME atomic)
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set(STDCPPATOMIC_LIBRARY atomic)
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endif()
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endif()
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cmake_pop_check_state()
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set(Atomic_FOUND ${_found} CACHE BOOL "TRUE if we can run a program using std::atomic" FORCE)
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mark_as_advanced(Atomic_FOUND)
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if(Atomic_FIND_REQUIRED AND NOT Atomic_FOUND)
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message(FATAL_ERROR "Cannot run simple program using std::atomic")
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endif()
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