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Merge pull request #22952 from tchaikov/wip-cmake-atomic

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cmake: should link against libatomic if libcxx/libstdc++ does not off…

Reviewed-by: Casey Bodley <cbodley@redhat.com>
This commit is contained in:
Kefu Chai 2018-07-12 20:40:41 +08:00 committed by GitHub
commit 467411ba6b
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2 changed files with 43 additions and 0 deletions
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5
CMakeLists.txt
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@ -171,6 +171,11 @@ if(WITH_STATIC_LIBSTDCXX)
message(FATAL_ERROR "Please use GCC to enable WITH_STATIC_LIBSTDCXX")
endif()
endif()
include(CheckCxxAtomic)
if(NOT HAVE_CXX11_ATOMIC)
set(CMAKE_CXX_STANDARD_LIBRARIES
"${CMAKE_CXX_STANDARD_LIBRARIES} ${LIBATOMIC_LINK_FLAGS}")
endif()
option(WITH_RDMA "Enable RDMA in async messenger" ON)
if(WITH_RDMA)

38
cmake/modules/CheckCxxAtomic.cmake Normal file
View File

@ -0,0 +1,38 @@
# some platforms do not offer support for atomic primitive for all integer
# types, in that case we need to link against libatomic
include(CheckCXXSourceCompiles)
include(CMakePushCheckState)
function(check_cxx_atomics var)
set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -std=c++11")
check_cxx_source_compiles("
#include <atomic>
#include <cstdint>
int main() {
std::atomic<uint8_t> w1;
std::atomic<uint16_t> w2;
std::atomic<uint32_t> w4;
std::atomic<uint64_t> w8;
return w1 + w2 + w4 + w8;
}
" ${var})
endfunction(check_cxx_atomics)
cmake_push_check_state()
check_cxx_atomics(HAVE_CXX11_ATOMIC)
cmake_pop_check_state()
if(NOT HAVE_CXX11_ATOMIC)
cmake_push_check_state()
set(CMAKE_REQUIRED_LIBRARIES "atomic")
check_cxx_atomics(HAVE_LIBATOMIC)
cmake_pop_check_state()
if(HAVE_LIBATOMIC)
set(LIBATOMIC_LINK_FLAGS "-Wl,--as-needed -latomic")
else()
message(FATAL_ERROR
"Host compiler ${CMAKE_CXX_COMPILER} requires libatomic, but it is not found")
endif()
endif()