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7b563be4ff
Sometimes linking against libatomic is required for atomic ops, if the platform doesn't support lock-free atomics.
98 lines
3.7 KiB
CMake
98 lines
3.7 KiB
CMake
# University of Illinois/NCSA
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# Open Source License
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#
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# Copyright (c) 2003-2017 University of Illinois at Urbana-Champaign.
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# All rights reserved.
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#
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# Developed by:
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#
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# LLVM Team
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#
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# University of Illinois at Urbana-Champaign
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#
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# http://llvm.org
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#
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# Permission is hereby granted, free of charge, to any person obtaining a copy of
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# this software and associated documentation files (the "Software"), to deal with
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# the Software without restriction, including without limitation the rights to
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# use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
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# of the Software, and to permit persons to whom the Software is furnished to do
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# so, subject to the following conditions:
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#
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# * Redistributions of source code must retain the above copyright notice,
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# this list of conditions and the following disclaimers.
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#
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# * Redistributions in binary form must reproduce the above copyright notice,
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# this list of conditions and the following disclaimers in the
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# documentation and/or other materials provided with the distribution.
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#
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# * Neither the names of the LLVM Team, University of Illinois at
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# Urbana-Champaign, nor the names of its contributors may be used to
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# endorse or promote products derived from this Software without specific
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# prior written permission.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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# FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# CONTRIBUTORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS WITH THE
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# SOFTWARE.
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include(CheckCXXSourceCompiles)
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include(CheckLibraryExists)
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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_working_cxx_atomics varname)
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set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS})
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get_directory_property(compile_options COMPILE_OPTIONS)
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set(CMAKE_REQUIRED_FLAGS ${compile_options})
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CHECK_CXX_SOURCE_COMPILES("
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#include <atomic>
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int main() {
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struct Test { int val; };
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std::atomic<Test> s;
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s.is_lock_free();
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}" ${varname})
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set(CMAKE_REQUIRED_FLAGS ${OLD_CMAKE_REQUIRED_FLAGS})
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endfunction(check_working_cxx_atomics)
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if(NOT DEFINED COMPILER_IS_GCC_COMPATIBLE)
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if(CMAKE_COMPILER_IS_GNUCXX)
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set(COMPILER_IS_GCC_COMPATIBLE ON)
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elseif(MSVC)
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set(COMPILER_IS_GCC_COMPATIBLE OFF)
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elseif(APPLE)
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set(COMPILER_IS_GCC_COMPATIBLE OFF)
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elseif("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang")
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set(COMPILER_IS_GCC_COMPATIBLE ON)
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elseif("${CMAKE_CXX_COMPILER_ID}" MATCHES "Intel")
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set(COMPILER_IS_GCC_COMPATIBLE ON)
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endif()
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endif()
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# This isn't necessary on MSVC, so avoid command-line switch annoyance
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# by only running on GCC-like hosts.
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if(COMPILER_IS_GCC_COMPATIBLE)
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# First check if atomics work without the library.
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check_working_cxx_atomics(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 HAVE_CXX_ATOMICS_WITHOUT_LIB)
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check_library_exists(atomic __atomic_fetch_add_4 "" HAVE_LIBATOMIC)
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if(HAVE_LIBATOMIC)
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list(APPEND CMAKE_REQUIRED_LIBRARIES "atomic")
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check_working_cxx_atomics(HAVE_CXX_ATOMICS_WITH_LIB)
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if (NOT HAVE_CXX_ATOMICS_WITH_LIB)
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message(FATAL_ERROR "Host compiler must support std::atomic!")
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endif()
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list(APPEND CMAKE_C_STANDARD_LIBRARIES -latomic)
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list(APPEND CMAKE_CXX_STANDARD_LIBRARIES -latomic)
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else()
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message(FATAL_ERROR "Host compiler appears to require libatomic, but cannot find it.")
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endif()
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endif()
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endif()
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