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63 lines
1.5 KiB
CMake
63 lines
1.5 KiB
CMake
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#
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# SRT - Secure, Reliable, Transport
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# Copyright (c) 2021 Haivision Systems Inc.
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#
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# This Source Code Form is subject to the terms of the Mozilla Public
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# License, v. 2.0. If a copy of the MPL was not distributed with this
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# file, You can obtain one at http://mozilla.org/MPL/2.0/.
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#
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# Check for c++11 std::atomic.
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#
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# Sets:
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# HAVE_CXX_ATOMIC
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# HAVE_CXX_ATOMIC_STATIC
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include(CheckCXXSourceCompiles)
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include(CheckLibraryExists)
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function(CheckCXXAtomic)
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unset(HAVE_CXX_ATOMIC CACHE)
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unset(HAVE_CXX_ATOMIC_STATIC CACHE)
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unset(CMAKE_REQUIRED_FLAGS)
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unset(CMAKE_REQUIRED_LIBRARIES)
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unset(CMAKE_REQUIRED_LINK_OPTIONS)
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set(CheckCXXAtomic_CODE
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"
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#include<cstdint>
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#include<atomic>
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int main(void)
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{
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std::atomic<std::ptrdiff_t> x(0);
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std::atomic<std::intmax_t> y(0);
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return x + y;
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}
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")
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set(CMAKE_REQUIRED_FLAGS "-std=c++11")
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check_cxx_source_compiles(
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"${CheckCXXAtomic_CODE}"
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HAVE_CXX_ATOMIC)
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if(HAVE_CXX_ATOMIC)
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# CMAKE_REQUIRED_LINK_OPTIONS was introduced in CMake 3.14.
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if(CMAKE_VERSION VERSION_LESS "3.14")
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set(CMAKE_REQUIRED_LINK_OPTIONS "-static")
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else()
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set(CMAKE_REQUIRED_FLAGS "-std=c++11 -static")
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endif()
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check_cxx_source_compiles(
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"${CheckCXXAtomic_CODE}"
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HAVE_CXX_ATOMIC_STATIC)
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endif()
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unset(CMAKE_REQUIRED_FLAGS)
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unset(CMAKE_REQUIRED_LIBRARIES)
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unset(CMAKE_REQUIRED_LINK_OPTIONS)
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endfunction(CheckCXXAtomic)
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