# Require CMake 3.10. If available, use the policies up to CMake 3.22. cmake_minimum_required (VERSION 3.10...3.22) project (benchmark VERSION 1.8.3 LANGUAGES CXX) option(BENCHMARK_ENABLE_TESTING "Enable testing of the benchmark library." ON) option(BENCHMARK_ENABLE_EXCEPTIONS "Enable the use of exceptions in the benchmark library." ON) option(BENCHMARK_ENABLE_LTO "Enable link time optimisation of the benchmark library." OFF) option(BENCHMARK_USE_LIBCXX "Build and test using libc++ as the standard library." OFF) option(BENCHMARK_ENABLE_WERROR "Build Release candidates with -Werror." ON) option(BENCHMARK_FORCE_WERROR "Build Release candidates with -Werror regardless of compiler issues." OFF) if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "PGI") # PGC++ maybe reporting false positives. set(BENCHMARK_ENABLE_WERROR OFF) endif() if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "NVHPC") set(BENCHMARK_ENABLE_WERROR OFF) endif() if(BENCHMARK_FORCE_WERROR) set(BENCHMARK_ENABLE_WERROR ON) endif(BENCHMARK_FORCE_WERROR) if(NOT MSVC) option(BENCHMARK_BUILD_32_BITS "Build a 32 bit version of the library." OFF) else() set(BENCHMARK_BUILD_32_BITS OFF CACHE BOOL "Build a 32 bit version of the library - unsupported when using MSVC)" FORCE) endif() option(BENCHMARK_ENABLE_INSTALL "Enable installation of benchmark. (Projects embedding benchmark may want to turn this OFF.)" ON) option(BENCHMARK_ENABLE_DOXYGEN "Build documentation with Doxygen." OFF) option(BENCHMARK_INSTALL_DOCS "Enable installation of documentation." ON) # Allow unmet dependencies to be met using CMake's ExternalProject mechanics, which # may require downloading the source code. option(BENCHMARK_DOWNLOAD_DEPENDENCIES "Allow the downloading and in-tree building of unmet dependencies" OFF) # This option can be used to disable building and running unit tests which depend on gtest # in cases where it is not possible to build or find a valid version of gtest. option(BENCHMARK_ENABLE_GTEST_TESTS "Enable building the unit tests which depend on gtest" ON) option(BENCHMARK_USE_BUNDLED_GTEST "Use bundled GoogleTest. If disabled, the find_package(GTest) will be used." ON) option(BENCHMARK_ENABLE_LIBPFM "Enable performance counters provided by libpfm" OFF) # Export only public symbols set(CMAKE_CXX_VISIBILITY_PRESET hidden) set(CMAKE_VISIBILITY_INLINES_HIDDEN ON) if(MSVC) # As of CMake 3.18, CMAKE_SYSTEM_PROCESSOR is not set properly for MSVC and # cross-compilation (e.g. Host=x86_64, target=aarch64) requires using the # undocumented, but working variable. # See https://gitlab.kitware.com/cmake/cmake/-/issues/15170 set(CMAKE_SYSTEM_PROCESSOR ${MSVC_CXX_ARCHITECTURE_ID}) if(${CMAKE_SYSTEM_PROCESSOR} MATCHES "ARM") set(CMAKE_CROSSCOMPILING TRUE) endif() endif() set(ENABLE_ASSEMBLY_TESTS_DEFAULT OFF) function(should_enable_assembly_tests) if(CMAKE_BUILD_TYPE) string(TOLOWER ${CMAKE_BUILD_TYPE} CMAKE_BUILD_TYPE_LOWER) if (${CMAKE_BUILD_TYPE_LOWER} MATCHES "coverage") # FIXME: The --coverage flag needs to be removed when building assembly # tests for this to work. return() endif() endif() if (MSVC) return() elseif(NOT CMAKE_SYSTEM_PROCESSOR MATCHES "x86_64") return() elseif(NOT CMAKE_SIZEOF_VOID_P EQUAL 8) # FIXME: Make these work on 32 bit builds return() elseif(BENCHMARK_BUILD_32_BITS) # FIXME: Make these work on 32 bit builds return() endif() find_program(LLVM_FILECHECK_EXE FileCheck) if (LLVM_FILECHECK_EXE) set(LLVM_FILECHECK_EXE "${LLVM_FILECHECK_EXE}" CACHE PATH "llvm filecheck" FORCE) message(STATUS "LLVM FileCheck Found: ${LLVM_FILECHECK_EXE}") else() message(STATUS "Failed to find LLVM FileCheck") return() endif() set(ENABLE_ASSEMBLY_TESTS_DEFAULT ON PARENT_SCOPE) endfunction() should_enable_assembly_tests() # This option disables the building and running of the assembly verification tests option(BENCHMARK_ENABLE_ASSEMBLY_TESTS "Enable building and running the assembly tests" ${ENABLE_ASSEMBLY_TESTS_DEFAULT}) # Make sure we can import out CMake functions list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake/Modules") list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake") # Read the git tags to determine the project version include(GetGitVersion) get_git_version(GIT_VERSION) # If no git version can be determined, use the version # from the project() command if ("${GIT_VERSION}" STREQUAL "0.0.0") set(VERSION "${benchmark_VERSION}") else() set(VERSION "${GIT_VERSION}") endif() # Tell the user what versions we are using message(STATUS "Google Benchmark version: ${VERSION}") # The version of the libraries set(GENERIC_LIB_VERSION ${VERSION}) string(SUBSTRING ${VERSION} 0 1 GENERIC_LIB_SOVERSION) # Import our CMake modules include(AddCXXCompilerFlag) include(CheckCXXCompilerFlag) include(CheckLibraryExists) include(CXXFeatureCheck) check_library_exists(rt shm_open "" HAVE_LIB_RT) if (BENCHMARK_BUILD_32_BITS) add_required_cxx_compiler_flag(-m32) endif() if (MSVC) set(BENCHMARK_CXX_STANDARD 14) else() set(BENCHMARK_CXX_STANDARD 11) endif() set(CMAKE_CXX_STANDARD ${BENCHMARK_CXX_STANDARD}) set(CMAKE_CXX_STANDARD_REQUIRED YES) set(CMAKE_CXX_EXTENSIONS OFF) if (MSVC) # Turn compiler warnings up to 11 string(REGEX REPLACE "[-/]W[1-4]" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}") set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /W4") add_definitions(-D_CRT_SECURE_NO_WARNINGS) if (NOT BENCHMARK_ENABLE_EXCEPTIONS) add_cxx_compiler_flag(-EHs-) add_cxx_compiler_flag(-EHa-) add_definitions(-D_HAS_EXCEPTIONS=0) endif() # Link time optimisation if (BENCHMARK_ENABLE_LTO) set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} /GL") set(CMAKE_STATIC_LINKER_FLAGS_RELEASE "${CMAKE_STATIC_LINKER_FLAGS_RELEASE} /LTCG") set(CMAKE_SHARED_LINKER_FLAGS_RELEASE "${CMAKE_SHARED_LINKER_FLAGS_RELEASE} /LTCG") set(CMAKE_EXE_LINKER_FLAGS_RELEASE "${CMAKE_EXE_LINKER_FLAGS_RELEASE} /LTCG") set(CMAKE_CXX_FLAGS_RELWITHDEBINFO "${CMAKE_CXX_FLAGS_RELWITHDEBINFO} /GL") string(REGEX REPLACE "[-/]INCREMENTAL" "/INCREMENTAL:NO" CMAKE_STATIC_LINKER_FLAGS_RELWITHDEBINFO "${CMAKE_STATIC_LINKER_FLAGS_RELWITHDEBINFO}") set(CMAKE_STATIC_LINKER_FLAGS_RELWITHDEBINFO "${CMAKE_STATIC_LINKER_FLAGS_RELWITHDEBINFO} /LTCG") string(REGEX REPLACE "[-/]INCREMENTAL" "/INCREMENTAL:NO" CMAKE_SHARED_LINKER_FLAGS_RELWITHDEBINFO "${CMAKE_SHARED_LINKER_FLAGS_RELWITHDEBINFO}") set(CMAKE_SHARED_LINKER_FLAGS_RELWITHDEBINFO "${CMAKE_SHARED_LINKER_FLAGS_RELWITHDEBINFO} /LTCG") string(REGEX REPLACE "[-/]INCREMENTAL" "/INCREMENTAL:NO" CMAKE_EXE_LINKER_FLAGS_RELWITHDEBINFO "${CMAKE_EXE_LINKER_FLAGS_RELWITHDEBINFO}") set(CMAKE_EXE_LINKER_FLAGS_RELWITHDEBINFO "${CMAKE_EXE_LINKER_FLAGS_RELWITHDEBINFO} /LTCG") set(CMAKE_CXX_FLAGS_MINSIZEREL "${CMAKE_CXX_FLAGS_MINSIZEREL} /GL") set(CMAKE_STATIC_LINKER_FLAGS_MINSIZEREL "${CMAKE_STATIC_LINKER_FLAGS_MINSIZEREL} /LTCG") set(CMAKE_SHARED_LINKER_FLAGS_MINSIZEREL "${CMAKE_SHARED_LINKER_FLAGS_MINSIZEREL} /LTCG") set(CMAKE_EXE_LINKER_FLAGS_MINSIZEREL "${CMAKE_EXE_LINKER_FLAGS_MINSIZEREL} /LTCG") endif() else() # Turn compiler warnings up to 11 add_cxx_compiler_flag(-Wall) add_cxx_compiler_flag(-Wextra) add_cxx_compiler_flag(-Wshadow) add_cxx_compiler_flag(-Wfloat-equal) add_cxx_compiler_flag(-Wold-style-cast) if(BENCHMARK_ENABLE_WERROR) add_cxx_compiler_flag(-Werror) endif() if (NOT BENCHMARK_ENABLE_TESTING) # Disable warning when compiling tests as gtest does not use 'override'. add_cxx_compiler_flag(-Wsuggest-override) endif() add_cxx_compiler_flag(-pedantic) add_cxx_compiler_flag(-pedantic-errors) add_cxx_compiler_flag(-Wshorten-64-to-32) add_cxx_compiler_flag(-fstrict-aliasing) # Disable warnings regarding deprecated parts of the library while building # and testing those parts of the library. add_cxx_compiler_flag(-Wno-deprecated-declarations) if (CMAKE_CXX_COMPILER_ID STREQUAL "Intel" OR CMAKE_CXX_COMPILER_ID STREQUAL "IntelLLVM") # Intel silently ignores '-Wno-deprecated-declarations', # warning no. 1786 must be explicitly disabled. # See #631 for rationale. add_cxx_compiler_flag(-wd1786) add_cxx_compiler_flag(-fno-finite-math-only) endif() # Disable deprecation warnings for release builds (when -Werror is enabled). if(BENCHMARK_ENABLE_WERROR) add_cxx_compiler_flag(-Wno-deprecated) endif() if (NOT BENCHMARK_ENABLE_EXCEPTIONS) add_cxx_compiler_flag(-fno-exceptions) endif() if (HAVE_CXX_FLAG_FSTRICT_ALIASING) if (NOT CMAKE_CXX_COMPILER_ID STREQUAL "Intel" AND NOT CMAKE_CXX_COMPILER_ID STREQUAL "IntelLLVM") #ICC17u2: Many false positives for Wstrict-aliasing add_cxx_compiler_flag(-Wstrict-aliasing) endif() endif() # ICC17u2: overloaded virtual function "benchmark::Fixture::SetUp" is only partially overridden # (because of deprecated overload) add_cxx_compiler_flag(-wd654) add_cxx_compiler_flag(-Wthread-safety) if (HAVE_CXX_FLAG_WTHREAD_SAFETY) cxx_feature_check(THREAD_SAFETY_ATTRIBUTES "-DINCLUDE_DIRECTORIES=${PROJECT_SOURCE_DIR}/include") endif() # On most UNIX like platforms g++ and clang++ define _GNU_SOURCE as a # predefined macro, which turns on all of the wonderful libc extensions. # However g++ doesn't do this in Cygwin so we have to define it ourselves # since we depend on GNU/POSIX/BSD extensions. if (CYGWIN) add_definitions(-D_GNU_SOURCE=1) endif() if (QNXNTO) add_definitions(-D_QNX_SOURCE) endif() # Link time optimisation if (BENCHMARK_ENABLE_LTO) add_cxx_compiler_flag(-flto) add_cxx_compiler_flag(-Wno-lto-type-mismatch) if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU") find_program(GCC_AR gcc-ar) if (GCC_AR) set(CMAKE_AR ${GCC_AR}) endif() find_program(GCC_RANLIB gcc-ranlib) if (GCC_RANLIB) set(CMAKE_RANLIB ${GCC_RANLIB}) endif() elseif("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang") include(llvm-toolchain) endif() endif() # Coverage build type set(BENCHMARK_CXX_FLAGS_COVERAGE "${CMAKE_CXX_FLAGS_DEBUG}" CACHE STRING "Flags used by the C++ compiler during coverage builds." FORCE) set(BENCHMARK_EXE_LINKER_FLAGS_COVERAGE "${CMAKE_EXE_LINKER_FLAGS_DEBUG}" CACHE STRING "Flags used for linking binaries during coverage builds." FORCE) set(BENCHMARK_SHARED_LINKER_FLAGS_COVERAGE "${CMAKE_SHARED_LINKER_FLAGS_DEBUG}" CACHE STRING "Flags used by the shared libraries linker during coverage builds." FORCE) mark_as_advanced( BENCHMARK_CXX_FLAGS_COVERAGE BENCHMARK_EXE_LINKER_FLAGS_COVERAGE BENCHMARK_SHARED_LINKER_FLAGS_COVERAGE) set(CMAKE_BUILD_TYPE "${CMAKE_BUILD_TYPE}" CACHE STRING "Choose the type of build, options are: None Debug Release RelWithDebInfo MinSizeRel Coverage.") add_cxx_compiler_flag(--coverage COVERAGE) endif() if (BENCHMARK_USE_LIBCXX) if ("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang") add_cxx_compiler_flag(-stdlib=libc++) elseif ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU" OR "${CMAKE_CXX_COMPILER_ID}" STREQUAL "Intel" OR "${CMAKE_CXX_COMPILER_ID}" STREQUAL "IntelLLVM") add_cxx_compiler_flag(-nostdinc++) message(WARNING "libc++ header path must be manually specified using CMAKE_CXX_FLAGS") # Adding -nodefaultlibs directly to CMAKE__LINKER_FLAGS will break # configuration checks such as 'find_package(Threads)' list(APPEND BENCHMARK_CXX_LINKER_FLAGS -nodefaultlibs) # -lc++ cannot be added directly to CMAKE__LINKER_FLAGS because # linker flags appear before all linker inputs and -lc++ must appear after. list(APPEND BENCHMARK_CXX_LIBRARIES c++) else() message(FATAL_ERROR "-DBENCHMARK_USE_LIBCXX:BOOL=ON is not supported for compiler") endif() endif(BENCHMARK_USE_LIBCXX) set(EXTRA_CXX_FLAGS "") if (WIN32 AND "${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang") # Clang on Windows fails to compile the regex feature check under C++11 set(EXTRA_CXX_FLAGS "-DCMAKE_CXX_STANDARD=14") endif() # C++ feature checks # Determine the correct regular expression engine to use cxx_feature_check(STD_REGEX ${EXTRA_CXX_FLAGS}) cxx_feature_check(GNU_POSIX_REGEX ${EXTRA_CXX_FLAGS}) cxx_feature_check(POSIX_REGEX ${EXTRA_CXX_FLAGS}) if(NOT HAVE_STD_REGEX AND NOT HAVE_GNU_POSIX_REGEX AND NOT HAVE_POSIX_REGEX) message(FATAL_ERROR "Failed to determine the source files for the regular expression backend") endif() if (NOT BENCHMARK_ENABLE_EXCEPTIONS AND HAVE_STD_REGEX AND NOT HAVE_GNU_POSIX_REGEX AND NOT HAVE_POSIX_REGEX) message(WARNING "Using std::regex with exceptions disabled is not fully supported") endif() cxx_feature_check(STEADY_CLOCK) # Ensure we have pthreads set(THREADS_PREFER_PTHREAD_FLAG ON) find_package(Threads REQUIRED) cxx_feature_check(PTHREAD_AFFINITY) if (BENCHMARK_ENABLE_LIBPFM) find_package(PFM) endif() # Set up directories include_directories(${PROJECT_SOURCE_DIR}/include) # Build the targets add_subdirectory(src) if (BENCHMARK_ENABLE_TESTING) enable_testing() if (BENCHMARK_ENABLE_GTEST_TESTS AND NOT (TARGET gtest AND TARGET gtest_main AND TARGET gmock AND TARGET gmock_main)) if (BENCHMARK_USE_BUNDLED_GTEST) include(GoogleTest) else() find_package(GTest CONFIG REQUIRED) add_library(gtest ALIAS GTest::gtest) add_library(gtest_main ALIAS GTest::gtest_main) add_library(gmock ALIAS GTest::gmock) add_library(gmock_main ALIAS GTest::gmock_main) endif() endif() add_subdirectory(test) endif()