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oxen-mq
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Merge a5f1574af7 into a27961d787

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Jason Rhinelander 2023-11-10 12:28:02 +08:00 committed by GitHub
parent a27961d787 a5f1574af7
commit faccac8e84
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2 changed files with 51 additions and 0 deletions
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2
CMakeLists.txt
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@ -22,6 +22,8 @@ project(liboxenmq
include(GNUInstallDirs)
include(cmake/libatomic.cmake)
message(STATUS "oxenmq v${PROJECT_VERSION}")
set(OXENMQ_LIBVERSION 0)

49
cmake/libatomic.cmake Normal file
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@ -0,0 +1,49 @@
include(CheckCXXSourceCompiles)
function(check_working_cxx_atomics64 varname)
set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS})
if (EMBEDDED_CFG)
set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -m32 -march=i486")
elseif(MSVC OR MSVC_VERSION)
set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -arch:IA32 -std:c++14")
else()
# CMAKE_CXX_STANDARD does not propagate to cmake compile tests
set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -std=c++14")
endif()
check_cxx_source_compiles("
#include <atomic>
#include <cstdint>
std::atomic<uint64_t> x (0);
int main() {
uint64_t i = x.load(std::memory_order_relaxed);
return 0;
}
" ${varname})
set(CMAKE_REQUIRED_FLAGS ${OLD_CMAKE_REQUIRED_FLAGS})
endfunction()
check_working_cxx_atomics64(HAVE_CXX_ATOMICS64_WITHOUT_LIB)
if(HAVE_CXX_ATOMICS64_WITHOUT_LIB)
message(STATUS "Have working 64bit atomics")
return()
endif()
if (NOT MSVC AND NOT MSVC_VERSION)
check_library_exists(atomic __atomic_load_8 "" HAVE_CXX_LIBATOMICS64)
if (HAVE_CXX_LIBATOMICS64)
message(STATUS "Have 64bit atomics via library")
list(APPEND CMAKE_REQUIRED_LIBRARIES "atomic")
check_working_cxx_atomics64(HAVE_CXX_ATOMICS64_WITH_LIB)
if (HAVE_CXX_ATOMICS64_WITH_LIB)
message(STATUS "Can link with libatomic")
link_libraries(-latomic)
return()
endif()
endif()
endif()
if (MSVC OR MSVC_VERSION)
message(FATAL_ERROR "Host compiler must support 64-bit std::atomic! (What does MSVC do to inline atomics?)")
else()
message(FATAL_ERROR "Host compiler must support 64-bit std::atomic!")
endif()