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Add CheckAtomic.cmake

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Sometimes linking against libatomic is required for atomic ops, if
the platform doesn't support lock-free atomics.
This commit is contained in:
yangfl 2022-01-01 15:25:35 +08:00
parent c59bc6595f
commit 7b563be4ff
2 changed files with 98 additions and 0 deletions
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1
CMakeLists.txt
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@ -83,6 +83,7 @@ endif()
include(CheckCCompilerFlag) include(CheckCCompilerFlag)
include(CheckCXXCompilerFlag) include(CheckCXXCompilerFlag)
include(CheckSymbolExists) include(CheckSymbolExists)
include(CheckAtomic)
check_symbol_exists(__i386 "" TARGET_ARCH_X86_i386) check_symbol_exists(__i386 "" TARGET_ARCH_X86_i386)
if(TARGET_ARCH_X86_i386) if(TARGET_ARCH_X86_i386)

97
cmake/CheckAtomic.cmake Normal file
View file

@ -0,0 +1,97 @@
# University of Illinois/NCSA
# Open Source License
#
# Copyright (c) 2003-2017 University of Illinois at Urbana-Champaign.
# All rights reserved.
#
# Developed by:
#
# LLVM Team
#
# University of Illinois at Urbana-Champaign
#
# http://llvm.org
#
# Permission is hereby granted, free of charge, to any person obtaining a copy of
# this software and associated documentation files (the "Software"), to deal with
# the Software without restriction, including without limitation the rights to
# use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
# of the Software, and to permit persons to whom the Software is furnished to do
# so, subject to the following conditions:
#
# * Redistributions of source code must retain the above copyright notice,
# this list of conditions and the following disclaimers.
#
# * Redistributions in binary form must reproduce the above copyright notice,
# this list of conditions and the following disclaimers in the
# documentation and/or other materials provided with the distribution.
#
# * Neither the names of the LLVM Team, University of Illinois at
# Urbana-Champaign, nor the names of its contributors may be used to
# endorse or promote products derived from this Software without specific
# prior written permission.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
# FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# CONTRIBUTORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS WITH THE
# SOFTWARE.
include(CheckCXXSourceCompiles)
include(CheckLibraryExists)
# Sometimes linking against libatomic is required for atomic ops, if
# the platform doesn't support lock-free atomics.
function(check_working_cxx_atomics varname)
set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS})
get_directory_property(compile_options COMPILE_OPTIONS)
set(CMAKE_REQUIRED_FLAGS ${compile_options})
CHECK_CXX_SOURCE_COMPILES("
#include <atomic>
int main() {
struct Test { int val; };
std::atomic<Test> s;
s.is_lock_free();
}" ${varname})
set(CMAKE_REQUIRED_FLAGS ${OLD_CMAKE_REQUIRED_FLAGS})
endfunction(check_working_cxx_atomics)
if(NOT DEFINED COMPILER_IS_GCC_COMPATIBLE)
if(CMAKE_COMPILER_IS_GNUCXX)
set(COMPILER_IS_GCC_COMPATIBLE ON)
elseif(MSVC)
set(COMPILER_IS_GCC_COMPATIBLE OFF)
elseif(APPLE)
set(COMPILER_IS_GCC_COMPATIBLE OFF)
elseif("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang")
set(COMPILER_IS_GCC_COMPATIBLE ON)
elseif("${CMAKE_CXX_COMPILER_ID}" MATCHES "Intel")
set(COMPILER_IS_GCC_COMPATIBLE ON)
endif()
endif()
# This isn't necessary on MSVC, so avoid command-line switch annoyance
# by only running on GCC-like hosts.
if(COMPILER_IS_GCC_COMPATIBLE)
# First check if atomics work without the library.
check_working_cxx_atomics(HAVE_CXX_ATOMICS_WITHOUT_LIB)
# If not, check if the library exists, and atomics work with it.
if(NOT HAVE_CXX_ATOMICS_WITHOUT_LIB)
check_library_exists(atomic __atomic_fetch_add_4 "" HAVE_LIBATOMIC)
if(HAVE_LIBATOMIC)
list(APPEND CMAKE_REQUIRED_LIBRARIES "atomic")
check_working_cxx_atomics(HAVE_CXX_ATOMICS_WITH_LIB)
if (NOT HAVE_CXX_ATOMICS_WITH_LIB)
message(FATAL_ERROR "Host compiler must support std::atomic!")
endif()
list(APPEND CMAKE_C_STANDARD_LIBRARIES -latomic)
list(APPEND CMAKE_CXX_STANDARD_LIBRARIES -latomic)
else()
message(FATAL_ERROR "Host compiler appears to require libatomic, but cannot find it.")
endif()
endif()
endif()