80 lines
2.7 KiB
CMake
80 lines
2.7 KiB
CMake
# Copyright (c) 2020-2021, Arm Limited and Contributors
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#
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# SPDX-License-Identifier: Apache-2.0
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#
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# Licensed under the Apache License, Version 2.0 the "License";
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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# check whether need to link atomic library explicitly
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INCLUDE(CheckCXXSourceCompiles)
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INCLUDE(CheckLibraryExists)
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if(NOT DEFINED VULKAN_COMPILER_IS_GCC_COMPATIBLE)
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if(CMAKE_COMPILER_IS_GNUCXX)
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set(VULKAN_COMPILER_IS_GCC_COMPATIBLE ON)
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elseif( MSVC )
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set(VULKAN_COMPILER_IS_GCC_COMPATIBLE OFF)
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elseif( "${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang" )
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set(VULKAN_COMPILER_IS_GCC_COMPATIBLE ON)
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elseif( "${CMAKE_CXX_COMPILER_ID}" MATCHES "Intel" )
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set(VULKAN_COMPILER_IS_GCC_COMPATIBLE ON)
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endif()
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endif()
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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 ${CMAKE_REQUIRED_FLAGS})
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set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -std=c++11")
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CHECK_CXX_SOURCE_COMPILES("
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#include <atomic>
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std::atomic<int> x;
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std::atomic<short> y;
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std::atomic<char> z;
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int main() {
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++z;
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++y;
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return ++x;
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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_working_cxx_atomics)
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function(check_working_cxx_atomics64 varname)
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set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS})
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set(CMAKE_REQUIRED_FLAGS "-std=c++11 ${CMAKE_REQUIRED_FLAGS}")
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CHECK_CXX_SOURCE_COMPILES("
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#include <atomic>
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#include <cstdint>
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std::atomic<uint64_t> x (0);
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int main() {
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uint64_t i = x.load(std::memory_order_relaxed);
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(void)i;
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return 0;
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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_working_cxx_atomics64)
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set(NEED_LINK_ATOMIC OFF CACHE BOOL "whether need to link against atomic library")
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if(VULKAN_COMPILER_IS_GCC_COMPATIBLE)
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# check if non-64-bit atomics work without the library.
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check_working_cxx_atomics(HAVE_CXX_ATOMICS_WITHOUT_LIB)
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# check 64-bit atomics work without the library.
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check_working_cxx_atomics64(HAVE_CXX_ATOMICS64_WITHOUT_LIB)
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if (NOT HAVE_CXX_ATOMICS_WITHOUT_LIB OR NOT HAVE_CXX_ATOMICS64_WITHOUT_LIB)
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set(NEED_LINK_ATOMIC ON CACHE BOOL "whether need to link to atomic library" FORCE)
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endif()
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endif()
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