diff --git a/CMakeLists.txt b/CMakeLists.txt index 7dc31d2..c6f0ec0 100644 --- a/CMakeLists.txt +++ b/CMakeLists.txt @@ -109,6 +109,11 @@ target_link_libraries(abaddon ${ZLIB_LIBRARY}) target_link_libraries(abaddon ${NLOHMANN_JSON_LIBRARIES}) target_link_libraries(abaddon ${CMAKE_DL_LIBS}) +include(CheckAtomic) +if (NOT HAVE_CXX_ATOMICS_WITHOUT_LIB OR NOT HAVE_CXX_ATOMICS64_WITHOUT_LIB) + target_link_libraries(abaddon atomic) +endif () + if (USE_LIBHANDY) find_package(libhandy REQUIRED) target_include_directories(abaddon PUBLIC ${libhandy_INCLUDE_DIRS}) diff --git a/cmake/CheckAtomic.cmake b/cmake/CheckAtomic.cmake new file mode 100644 index 0000000..f7e79e8 --- /dev/null +++ b/cmake/CheckAtomic.cmake @@ -0,0 +1,107 @@ +#[[ +From https://github.com/pothosware/SoapyRTLSDR/blob/master/CheckAtomic.cmake +This file is licensed as MIT: +The MIT License (MIT) + +Copyright (c) 2015 Charles J. Cliffe + +Permission is hereby granted, free of charge, to any person obtaining a copy +of this software and associated documentation files (the "Software"), to deal +in 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: + +The above copyright notice and this permission notice shall be included in +all copies or substantial portions of the Software. + +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 +AUTHORS 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 IN +THE SOFTWARE. +]] + +# - Try to find if atomics need -latomic linking +# Once done this will define +# HAVE_CXX_ATOMICS_WITHOUT_LIB - Wether atomic types work without -latomic +# HAVE_CXX_ATOMICS64_WITHOUT_LIB - Wether 64 bit atomic types work without -latomic + +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 ${CMAKE_REQUIRED_FLAGS}) +set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -std=c++11") +CHECK_CXX_SOURCE_COMPILES(" +#include +std::atomic x; +int main() { +return std::atomic_is_lock_free(&x); +} +" ${varname}) +set(CMAKE_REQUIRED_FLAGS ${OLD_CMAKE_REQUIRED_FLAGS}) +endfunction(check_working_cxx_atomics) + +function(check_working_cxx_atomics64 varname) +set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS}) +set(CMAKE_REQUIRED_FLAGS "-std=c++11 ${CMAKE_REQUIRED_FLAGS}") +CHECK_CXX_SOURCE_COMPILES(" +#include +#include +std::atomic x (0); +int main() { +uint64_t i = x.load(std::memory_order_relaxed); +return std::atomic_is_lock_free(&x); +} +" ${varname}) +set(CMAKE_REQUIRED_FLAGS ${OLD_CMAKE_REQUIRED_FLAGS}) +endfunction(check_working_cxx_atomics64) + +# Check for atomic operations. +if(MSVC) + # This isn't necessary on MSVC. + set(HAVE_CXX_ATOMICS_WITHOUT_LIB True) +else() + # First check if atomics work without the library. + check_working_cxx_atomics(HAVE_CXX_ATOMICS_WITHOUT_LIB) +endif() + +# 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(NOT HAVE_LIBATOMIC) + message(STATUS "Host compiler appears to require libatomic, but cannot locate it.") + endif() + 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() +endif() + +# Check for 64 bit atomic operations. +if(MSVC) + set(HAVE_CXX_ATOMICS64_WITHOUT_LIB True) +else() + check_working_cxx_atomics64(HAVE_CXX_ATOMICS64_WITHOUT_LIB) +endif() + +# If not, check if the library exists, and atomics work with it. +if(NOT HAVE_CXX_ATOMICS64_WITHOUT_LIB) + check_library_exists(atomic __atomic_load_8 "" HAVE_LIBATOMIC64) + if(NOT HAVE_LIBATOMIC64) + message(STATUS "Host compiler appears to require libatomic, but cannot locate it.") + endif() + list(APPEND CMAKE_REQUIRED_LIBRARIES "atomic") + check_working_cxx_atomics64(HAVE_CXX_ATOMICS64_WITH_LIB) + if (NOT HAVE_CXX_ATOMICS64_WITH_LIB) + message(FATAL_ERROR "Host compiler must support std::atomic!") + endif() +endif() +