1cmake_minimum_required (VERSION 2.8.12) 2 3project (benchmark) 4 5foreach(p 6 CMP0054 # CMake 3.1 7 CMP0056 # export EXE_LINKER_FLAGS to try_run 8 CMP0057 # Support no if() IN_LIST operator 9 ) 10 if(POLICY ${p}) 11 cmake_policy(SET ${p} NEW) 12 endif() 13endforeach() 14 15option(BENCHMARK_ENABLE_TESTING "Enable testing of the benchmark library." ON) 16option(BENCHMARK_ENABLE_EXCEPTIONS "Enable the use of exceptions in the benchmark library." ON) 17option(BENCHMARK_ENABLE_LTO "Enable link time optimisation of the benchmark library." OFF) 18option(BENCHMARK_USE_LIBCXX "Build and test using libc++ as the standard library." OFF) 19option(BENCHMARK_BUILD_32_BITS "Build a 32 bit version of the library." OFF) 20option(BENCHMARK_ENABLE_INSTALL "Enable installation of benchmark. (Projects embedding benchmark may want to turn this OFF.)" ON) 21 22# Allow unmet dependencies to be met using CMake's ExternalProject mechanics, which 23# may require downloading the source code. 24option(BENCHMARK_DOWNLOAD_DEPENDENCIES "Allow the downloading and in-tree building of unmet dependencies" OFF) 25 26# This option can be used to disable building and running unit tests which depend on gtest 27# in cases where it is not possible to build or find a valid version of gtest. 28option(BENCHMARK_ENABLE_GTEST_TESTS "Enable building the unit tests which depend on gtest" ON) 29 30set(ENABLE_ASSEMBLY_TESTS_DEFAULT OFF) 31function(should_enable_assembly_tests) 32 if(CMAKE_BUILD_TYPE) 33 string(TOLOWER ${CMAKE_BUILD_TYPE} CMAKE_BUILD_TYPE_LOWER) 34 if (${CMAKE_BUILD_TYPE_LOWER} MATCHES "coverage") 35 # FIXME: The --coverage flag needs to be removed when building assembly 36 # tests for this to work. 37 return() 38 endif() 39 endif() 40 if (MSVC) 41 return() 42 elseif(NOT CMAKE_SYSTEM_PROCESSOR MATCHES "x86_64") 43 return() 44 elseif(NOT CMAKE_SIZEOF_VOID_P EQUAL 8) 45 # FIXME: Make these work on 32 bit builds 46 return() 47 elseif(BENCHMARK_BUILD_32_BITS) 48 # FIXME: Make these work on 32 bit builds 49 return() 50 endif() 51 find_program(LLVM_FILECHECK_EXE FileCheck) 52 if (LLVM_FILECHECK_EXE) 53 set(LLVM_FILECHECK_EXE "${LLVM_FILECHECK_EXE}" CACHE PATH "llvm filecheck" FORCE) 54 message(STATUS "LLVM FileCheck Found: ${LLVM_FILECHECK_EXE}") 55 else() 56 message(STATUS "Failed to find LLVM FileCheck") 57 return() 58 endif() 59 set(ENABLE_ASSEMBLY_TESTS_DEFAULT ON PARENT_SCOPE) 60endfunction() 61should_enable_assembly_tests() 62 63# This option disables the building and running of the assembly verification tests 64option(BENCHMARK_ENABLE_ASSEMBLY_TESTS "Enable building and running the assembly tests" 65 ${ENABLE_ASSEMBLY_TESTS_DEFAULT}) 66 67# Make sure we can import out CMake functions 68list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake/Modules") 69list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake") 70 71 72# Read the git tags to determine the project version 73include(GetGitVersion) 74get_git_version(GIT_VERSION) 75 76# Tell the user what versions we are using 77string(REGEX MATCH "[0-9]+\\.[0-9]+\\.[0-9]+" VERSION ${GIT_VERSION}) 78message("-- Version: ${VERSION}") 79 80# The version of the libraries 81set(GENERIC_LIB_VERSION ${VERSION}) 82string(SUBSTRING ${VERSION} 0 1 GENERIC_LIB_SOVERSION) 83 84# Import our CMake modules 85include(CheckCXXCompilerFlag) 86include(AddCXXCompilerFlag) 87include(CXXFeatureCheck) 88 89if (BENCHMARK_BUILD_32_BITS) 90 add_required_cxx_compiler_flag(-m32) 91endif() 92 93if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "MSVC") 94 # Turn compiler warnings up to 11 95 string(REGEX REPLACE "[-/]W[1-4]" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}") 96 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /W4") 97 add_definitions(-D_CRT_SECURE_NO_WARNINGS) 98 99 if (NOT BENCHMARK_ENABLE_EXCEPTIONS) 100 add_cxx_compiler_flag(-EHs-) 101 add_cxx_compiler_flag(-EHa-) 102 endif() 103 # Link time optimisation 104 if (BENCHMARK_ENABLE_LTO) 105 set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} /GL") 106 set(CMAKE_STATIC_LINKER_FLAGS_RELEASE "${CMAKE_STATIC_LINKER_FLAGS_RELEASE} /LTCG") 107 set(CMAKE_SHARED_LINKER_FLAGS_RELEASE "${CMAKE_SHARED_LINKER_FLAGS_RELEASE} /LTCG") 108 set(CMAKE_EXE_LINKER_FLAGS_RELEASE "${CMAKE_EXE_LINKER_FLAGS_RELEASE} /LTCG") 109 110 set(CMAKE_CXX_FLAGS_RELWITHDEBINFO "${CMAKE_CXX_FLAGS_RELWITHDEBINFO} /GL") 111 string(REGEX REPLACE "[-/]INCREMENTAL" "/INCREMENTAL:NO" CMAKE_STATIC_LINKER_FLAGS_RELWITHDEBINFO "${CMAKE_STATIC_LINKER_FLAGS_RELWITHDEBINFO}") 112 set(CMAKE_STATIC_LINKER_FLAGS_RELWITHDEBINFO "${CMAKE_STATIC_LINKER_FLAGS_RELWITHDEBINFO} /LTCG") 113 string(REGEX REPLACE "[-/]INCREMENTAL" "/INCREMENTAL:NO" CMAKE_SHARED_LINKER_FLAGS_RELWITHDEBINFO "${CMAKE_SHARED_LINKER_FLAGS_RELWITHDEBINFO}") 114 set(CMAKE_SHARED_LINKER_FLAGS_RELWITHDEBINFO "${CMAKE_SHARED_LINKER_FLAGS_RELWITHDEBINFO} /LTCG") 115 string(REGEX REPLACE "[-/]INCREMENTAL" "/INCREMENTAL:NO" CMAKE_EXE_LINKER_FLAGS_RELWITHDEBINFO "${CMAKE_EXE_LINKER_FLAGS_RELWITHDEBINFO}") 116 set(CMAKE_EXE_LINKER_FLAGS_RELWITHDEBINFO "${CMAKE_EXE_LINKER_FLAGS_RELWITHDEBINFO} /LTCG") 117 118 set(CMAKE_CXX_FLAGS_MINSIZEREL "${CMAKE_CXX_FLAGS_MINSIZEREL} /GL") 119 set(CMAKE_STATIC_LINKER_FLAGS_MINSIZEREL "${CMAKE_STATIC_LINKER_FLAGS_MINSIZEREL} /LTCG") 120 set(CMAKE_SHARED_LINKER_FLAGS_MINSIZEREL "${CMAKE_SHARED_LINKER_FLAGS_MINSIZEREL} /LTCG") 121 set(CMAKE_EXE_LINKER_FLAGS_MINSIZEREL "${CMAKE_EXE_LINKER_FLAGS_MINSIZEREL} /LTCG") 122 endif() 123else() 124 # Try and enable C++11. Don't use C++14 because it doesn't work in some 125 # configurations. 126 add_cxx_compiler_flag(-std=c++11) 127 if (NOT HAVE_CXX_FLAG_STD_CXX11) 128 add_cxx_compiler_flag(-std=c++0x) 129 endif() 130 131 # Turn compiler warnings up to 11 132 add_cxx_compiler_flag(-Wall) 133 134 add_cxx_compiler_flag(-Wextra) 135 add_cxx_compiler_flag(-Wshadow) 136 add_cxx_compiler_flag(-Werror RELEASE) 137 add_cxx_compiler_flag(-Werror RELWITHDEBINFO) 138 add_cxx_compiler_flag(-Werror MINSIZEREL) 139 add_cxx_compiler_flag(-pedantic) 140 add_cxx_compiler_flag(-pedantic-errors) 141 add_cxx_compiler_flag(-Wshorten-64-to-32) 142 add_cxx_compiler_flag(-Wfloat-equal) 143 add_cxx_compiler_flag(-fstrict-aliasing) 144 if (NOT BENCHMARK_ENABLE_EXCEPTIONS) 145 add_cxx_compiler_flag(-fno-exceptions) 146 endif() 147 148 if (HAVE_CXX_FLAG_FSTRICT_ALIASING) 149 if (NOT CMAKE_CXX_COMPILER_ID STREQUAL "Intel") #ICC17u2: Many false positives for Wstrict-aliasing 150 add_cxx_compiler_flag(-Wstrict-aliasing) 151 endif() 152 endif() 153 # ICC17u2: overloaded virtual function "benchmark::Fixture::SetUp" is only partially overridden 154 # (because of deprecated overload) 155 add_cxx_compiler_flag(-wd654) 156 add_cxx_compiler_flag(-Wthread-safety) 157 if (HAVE_CXX_FLAG_WTHREAD_SAFETY) 158 cxx_feature_check(THREAD_SAFETY_ATTRIBUTES) 159 endif() 160 161 # On most UNIX like platforms g++ and clang++ define _GNU_SOURCE as a 162 # predefined macro, which turns on all of the wonderful libc extensions. 163 # However g++ doesn't do this in Cygwin so we have to define it ourselfs 164 # since we depend on GNU/POSIX/BSD extensions. 165 if (CYGWIN) 166 add_definitions(-D_GNU_SOURCE=1) 167 endif() 168 169 # Link time optimisation 170 if (BENCHMARK_ENABLE_LTO) 171 add_cxx_compiler_flag(-flto) 172 if ("${CMAKE_C_COMPILER_ID}" STREQUAL "GNU") 173 find_program(GCC_AR gcc-ar) 174 if (GCC_AR) 175 set(CMAKE_AR ${GCC_AR}) 176 endif() 177 find_program(GCC_RANLIB gcc-ranlib) 178 if (GCC_RANLIB) 179 set(CMAKE_RANLIB ${GCC_RANLIB}) 180 endif() 181 elseif("${CMAKE_C_COMPILER_ID}" STREQUAL "Clang") 182 include(llvm-toolchain) 183 endif() 184 endif() 185 186 # Coverage build type 187 set(BENCHMARK_CXX_FLAGS_COVERAGE "${CMAKE_CXX_FLAGS_DEBUG}" 188 CACHE STRING "Flags used by the C++ compiler during coverage builds." 189 FORCE) 190 set(BENCHMARK_EXE_LINKER_FLAGS_COVERAGE "${CMAKE_EXE_LINKER_FLAGS_DEBUG}" 191 CACHE STRING "Flags used for linking binaries during coverage builds." 192 FORCE) 193 set(BENCHMARK_SHARED_LINKER_FLAGS_COVERAGE "${CMAKE_SHARED_LINKER_FLAGS_DEBUG}" 194 CACHE STRING "Flags used by the shared libraries linker during coverage builds." 195 FORCE) 196 mark_as_advanced( 197 BENCHMARK_CXX_FLAGS_COVERAGE 198 BENCHMARK_EXE_LINKER_FLAGS_COVERAGE 199 BENCHMARK_SHARED_LINKER_FLAGS_COVERAGE) 200 set(CMAKE_BUILD_TYPE "${CMAKE_BUILD_TYPE}" CACHE STRING 201 "Choose the type of build, options are: None Debug Release RelWithDebInfo MinSizeRel Coverage.") 202 add_cxx_compiler_flag(--coverage COVERAGE) 203endif() 204 205if (BENCHMARK_USE_LIBCXX) 206 if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang") 207 add_cxx_compiler_flag(-stdlib=libc++) 208 elseif ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU" OR 209 "${CMAKE_CXX_COMPILER_ID}" STREQUAL "Intel") 210 add_cxx_compiler_flag(-nostdinc++) 211 message("libc++ header path must be manually specified using CMAKE_CXX_FLAGS") 212 # Adding -nodefaultlibs directly to CMAKE_<TYPE>_LINKER_FLAGS will break 213 # configuration checks such as 'find_package(Threads)' 214 list(APPEND BENCHMARK_CXX_LINKER_FLAGS -nodefaultlibs) 215 # -lc++ cannot be added directly to CMAKE_<TYPE>_LINKER_FLAGS because 216 # linker flags appear before all linker inputs and -lc++ must appear after. 217 list(APPEND BENCHMARK_CXX_LIBRARIES c++) 218 else() 219 message(FATAL_ERROR "-DBENCHMARK_USE_LIBCXX:BOOL=ON is not supported for compiler") 220 endif() 221endif(BENCHMARK_USE_LIBCXX) 222 223# C++ feature checks 224# Determine the correct regular expression engine to use 225cxx_feature_check(STD_REGEX) 226cxx_feature_check(GNU_POSIX_REGEX) 227cxx_feature_check(POSIX_REGEX) 228if(NOT HAVE_STD_REGEX AND NOT HAVE_GNU_POSIX_REGEX AND NOT HAVE_POSIX_REGEX) 229 message(FATAL_ERROR "Failed to determine the source files for the regular expression backend") 230endif() 231if (NOT BENCHMARK_ENABLE_EXCEPTIONS AND HAVE_STD_REGEX 232 AND NOT HAVE_GNU_POSIX_REGEX AND NOT HAVE_POSIX_REGEX) 233 message(WARNING "Using std::regex with exceptions disabled is not fully supported") 234endif() 235cxx_feature_check(STEADY_CLOCK) 236# Ensure we have pthreads 237find_package(Threads REQUIRED) 238 239# Set up directories 240include_directories(${PROJECT_SOURCE_DIR}/include) 241 242# Build the targets 243add_subdirectory(src) 244 245if (BENCHMARK_ENABLE_TESTING) 246 enable_testing() 247 if (BENCHMARK_ENABLE_GTEST_TESTS) 248 include(HandleGTest) 249 endif() 250 add_subdirectory(test) 251endif() 252