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Add check to cmake to see if we need to link against -latomic (#8183) 

Summary:
For some compilers/environments (e.g. Clang, riscv64), we need to link against -latomic.  Check if this is a requirement and add the library to the third-party libs if it is.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/8183

Reviewed By: pdillinger

Differential Revision: D27773564

Pulled By: mrambacher

fbshipit-source-id: 68e15d823144f83fb02221c7bf5b1e43323419bf
This commit is contained in:
mrambacher 2021-04-22 08:28:20 -07:00 committed by Facebook GitHub Bot
parent 314352761f
commit 47b424f4bd
1 changed files with 22 additions and 1 deletions
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23
CMakeLists.txt
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@ -296,6 +296,7 @@ else()
endif()
include(CheckCXXSourceCompiles)
set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS})
if(NOT MSVC)
set(CMAKE_REQUIRED_FLAGS "-msse4.2 -mpclmul")
endif()
@ -312,7 +313,6 @@ int main() {
auto d = _mm_cvtsi128_si64(c);
}
" HAVE_SSE42)
unset(CMAKE_REQUIRED_FLAGS)
if(HAVE_SSE42)
add_definitions(-DHAVE_SSE42)
add_definitions(-DHAVE_PCLMUL)
@ -320,6 +320,27 @@ elseif(FORCE_SSE42)
message(FATAL_ERROR "FORCE_SSE42=ON but unable to compile with SSE4.2 enabled")
endif()
# Check if -latomic is required or not
if (NOT MSVC)
set(CMAKE_REQUIRED_FLAGS "--std=c++11")
CHECK_CXX_SOURCE_COMPILES("
#include <atomic>
std::atomic<uint64_t> x(0);
int main() {
uint64_t i = x.load(std::memory_order_relaxed);
bool b = x.is_lock_free();
return 0;
}
" BUILTIN_ATOMIC)
if (NOT BUILTIN_ATOMIC)
#TODO: Check if -latomic exists
list(APPEND THIRDPARTY_LIBS atomic)
endif()
endif()
# Reset the required flags
set(CMAKE_REQUIRED_FLAGS ${OLD_CMAKE_REQUIRED_FLAGS})
CHECK_CXX_SOURCE_COMPILES("
#if defined(_MSC_VER) && !defined(__thread)
#define __thread __declspec(thread)