1cmake_minimum_required (VERSION 3.5.1) 2 3foreach(p 4 CMP0048 # OK to clear PROJECT_VERSION on project() 5 CMP0054 # CMake 3.1 6 CMP0056 # export EXE_LINKER_FLAGS to try_run 7 CMP0057 # Support no if() IN_LIST operator 8 CMP0063 # Honor visibility properties for all targets 9 CMP0077 # Allow option() overrides in importing projects 10 ) 11 if(POLICY ${p}) 12 cmake_policy(SET ${p} NEW) 13 endif() 14endforeach() 15 16project (benchmark CXX) 17 18option(BENCHMARK_ENABLE_TESTING "Enable testing of the benchmark library." ON) 19option(BENCHMARK_ENABLE_EXCEPTIONS "Enable the use of exceptions in the benchmark library." ON) 20option(BENCHMARK_ENABLE_LTO "Enable link time optimisation of the benchmark library." OFF) 21option(BENCHMARK_USE_LIBCXX "Build and test using libc++ as the standard library." OFF) 22if(NOT MSVC) 23 option(BENCHMARK_BUILD_32_BITS "Build a 32 bit version of the library." OFF) 24else() 25 set(BENCHMARK_BUILD_32_BITS OFF CACHE BOOL "Build a 32 bit version of the library - unsupported when using MSVC)" FORCE) 26endif() 27option(BENCHMARK_ENABLE_INSTALL "Enable installation of benchmark. (Projects embedding benchmark may want to turn this OFF.)" ON) 28 29# Allow unmet dependencies to be met using CMake's ExternalProject mechanics, which 30# may require downloading the source code. 31option(BENCHMARK_DOWNLOAD_DEPENDENCIES "Allow the downloading and in-tree building of unmet dependencies" OFF) 32 33# This option can be used to disable building and running unit tests which depend on gtest 34# in cases where it is not possible to build or find a valid version of gtest. 35option(BENCHMARK_ENABLE_GTEST_TESTS "Enable building the unit tests which depend on gtest" ON) 36 37set(CMAKE_WINDOWS_EXPORT_ALL_SYMBOLS ON) 38set(ENABLE_ASSEMBLY_TESTS_DEFAULT OFF) 39function(should_enable_assembly_tests) 40 if(CMAKE_BUILD_TYPE) 41 string(TOLOWER ${CMAKE_BUILD_TYPE} CMAKE_BUILD_TYPE_LOWER) 42 if (${CMAKE_BUILD_TYPE_LOWER} MATCHES "coverage") 43 # FIXME: The --coverage flag needs to be removed when building assembly 44 # tests for this to work. 45 return() 46 endif() 47 endif() 48 if (MSVC) 49 return() 50 elseif(NOT CMAKE_SYSTEM_PROCESSOR MATCHES "x86_64") 51 return() 52 elseif(NOT CMAKE_SIZEOF_VOID_P EQUAL 8) 53 # FIXME: Make these work on 32 bit builds 54 return() 55 elseif(BENCHMARK_BUILD_32_BITS) 56 # FIXME: Make these work on 32 bit builds 57 return() 58 endif() 59 find_program(LLVM_FILECHECK_EXE FileCheck) 60 if (LLVM_FILECHECK_EXE) 61 set(LLVM_FILECHECK_EXE "${LLVM_FILECHECK_EXE}" CACHE PATH "llvm filecheck" FORCE) 62 message(STATUS "LLVM FileCheck Found: ${LLVM_FILECHECK_EXE}") 63 else() 64 message(STATUS "Failed to find LLVM FileCheck") 65 return() 66 endif() 67 set(ENABLE_ASSEMBLY_TESTS_DEFAULT ON PARENT_SCOPE) 68endfunction() 69should_enable_assembly_tests() 70 71# This option disables the building and running of the assembly verification tests 72option(BENCHMARK_ENABLE_ASSEMBLY_TESTS "Enable building and running the assembly tests" 73 ${ENABLE_ASSEMBLY_TESTS_DEFAULT}) 74 75# Make sure we can import out CMake functions 76list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake/Modules") 77list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake") 78 79 80# Read the git tags to determine the project version 81include(GetGitVersion) 82get_git_version(GIT_VERSION) 83 84# Tell the user what versions we are using 85string(REGEX MATCH "[0-9]+\\.[0-9]+\\.[0-9]+" VERSION ${GIT_VERSION}) 86message(STATUS "Version: ${VERSION}") 87 88# The version of the libraries 89set(GENERIC_LIB_VERSION ${VERSION}) 90string(SUBSTRING ${VERSION} 0 1 GENERIC_LIB_SOVERSION) 91 92# Import our CMake modules 93include(CheckCXXCompilerFlag) 94include(AddCXXCompilerFlag) 95include(CXXFeatureCheck) 96 97if (BENCHMARK_BUILD_32_BITS) 98 add_required_cxx_compiler_flag(-m32) 99endif() 100 101if (MSVC) 102 # Turn compiler warnings up to 11 103 string(REGEX REPLACE "[-/]W[1-4]" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}") 104 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /W4") 105 add_definitions(-D_CRT_SECURE_NO_WARNINGS) 106 107 if (NOT BENCHMARK_ENABLE_EXCEPTIONS) 108 add_cxx_compiler_flag(-EHs-) 109 add_cxx_compiler_flag(-EHa-) 110 add_definitions(-D_HAS_EXCEPTIONS=0) 111 endif() 112 # Link time optimisation 113 if (BENCHMARK_ENABLE_LTO) 114 set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} /GL") 115 set(CMAKE_STATIC_LINKER_FLAGS_RELEASE "${CMAKE_STATIC_LINKER_FLAGS_RELEASE} /LTCG") 116 set(CMAKE_SHARED_LINKER_FLAGS_RELEASE "${CMAKE_SHARED_LINKER_FLAGS_RELEASE} /LTCG") 117 set(CMAKE_EXE_LINKER_FLAGS_RELEASE "${CMAKE_EXE_LINKER_FLAGS_RELEASE} /LTCG") 118 119 set(CMAKE_CXX_FLAGS_RELWITHDEBINFO "${CMAKE_CXX_FLAGS_RELWITHDEBINFO} /GL") 120 string(REGEX REPLACE "[-/]INCREMENTAL" "/INCREMENTAL:NO" CMAKE_STATIC_LINKER_FLAGS_RELWITHDEBINFO "${CMAKE_STATIC_LINKER_FLAGS_RELWITHDEBINFO}") 121 set(CMAKE_STATIC_LINKER_FLAGS_RELWITHDEBINFO "${CMAKE_STATIC_LINKER_FLAGS_RELWITHDEBINFO} /LTCG") 122 string(REGEX REPLACE "[-/]INCREMENTAL" "/INCREMENTAL:NO" CMAKE_SHARED_LINKER_FLAGS_RELWITHDEBINFO "${CMAKE_SHARED_LINKER_FLAGS_RELWITHDEBINFO}") 123 set(CMAKE_SHARED_LINKER_FLAGS_RELWITHDEBINFO "${CMAKE_SHARED_LINKER_FLAGS_RELWITHDEBINFO} /LTCG") 124 string(REGEX REPLACE "[-/]INCREMENTAL" "/INCREMENTAL:NO" CMAKE_EXE_LINKER_FLAGS_RELWITHDEBINFO "${CMAKE_EXE_LINKER_FLAGS_RELWITHDEBINFO}") 125 set(CMAKE_EXE_LINKER_FLAGS_RELWITHDEBINFO "${CMAKE_EXE_LINKER_FLAGS_RELWITHDEBINFO} /LTCG") 126 127 set(CMAKE_CXX_FLAGS_MINSIZEREL "${CMAKE_CXX_FLAGS_MINSIZEREL} /GL") 128 set(CMAKE_STATIC_LINKER_FLAGS_MINSIZEREL "${CMAKE_STATIC_LINKER_FLAGS_MINSIZEREL} /LTCG") 129 set(CMAKE_SHARED_LINKER_FLAGS_MINSIZEREL "${CMAKE_SHARED_LINKER_FLAGS_MINSIZEREL} /LTCG") 130 set(CMAKE_EXE_LINKER_FLAGS_MINSIZEREL "${CMAKE_EXE_LINKER_FLAGS_MINSIZEREL} /LTCG") 131 endif() 132else() 133 # Try and enable C++11. Don't use C++14 because it doesn't work in some 134 # configurations. 135 add_cxx_compiler_flag(-std=c++11) 136 if (NOT HAVE_CXX_FLAG_STD_CXX11) 137 add_cxx_compiler_flag(-std=c++0x) 138 endif() 139 140 # Turn compiler warnings up to 11 141 add_cxx_compiler_flag(-Wall) 142 add_cxx_compiler_flag(-Wextra) 143 add_cxx_compiler_flag(-Wshadow) 144 add_cxx_compiler_flag(-Werror RELEASE) 145 add_cxx_compiler_flag(-Werror RELWITHDEBINFO) 146 add_cxx_compiler_flag(-Werror MINSIZEREL) 147 # Disabled until googletest (gmock) stops emitting variadic macro warnings 148 #add_cxx_compiler_flag(-pedantic) 149 #add_cxx_compiler_flag(-pedantic-errors) 150 add_cxx_compiler_flag(-Wshorten-64-to-32) 151 add_cxx_compiler_flag(-fstrict-aliasing) 152 # Disable warnings regarding deprecated parts of the library while building 153 # and testing those parts of the library. 154 add_cxx_compiler_flag(-Wno-deprecated-declarations) 155 if (CMAKE_CXX_COMPILER_ID STREQUAL "Intel") 156 # Intel silently ignores '-Wno-deprecated-declarations', 157 # warning no. 1786 must be explicitly disabled. 158 # See #631 for rationale. 159 add_cxx_compiler_flag(-wd1786) 160 endif() 161 # Disable deprecation warnings for release builds (when -Werror is enabled). 162 add_cxx_compiler_flag(-Wno-deprecated RELEASE) 163 add_cxx_compiler_flag(-Wno-deprecated RELWITHDEBINFO) 164 add_cxx_compiler_flag(-Wno-deprecated MINSIZEREL) 165 if (NOT BENCHMARK_ENABLE_EXCEPTIONS) 166 add_cxx_compiler_flag(-fno-exceptions) 167 endif() 168 169 if (HAVE_CXX_FLAG_FSTRICT_ALIASING) 170 if (NOT CMAKE_CXX_COMPILER_ID STREQUAL "Intel") #ICC17u2: Many false positives for Wstrict-aliasing 171 add_cxx_compiler_flag(-Wstrict-aliasing) 172 endif() 173 endif() 174 # ICC17u2: overloaded virtual function "benchmark::Fixture::SetUp" is only partially overridden 175 # (because of deprecated overload) 176 add_cxx_compiler_flag(-wd654) 177 add_cxx_compiler_flag(-Wthread-safety) 178 if (HAVE_CXX_FLAG_WTHREAD_SAFETY) 179 cxx_feature_check(THREAD_SAFETY_ATTRIBUTES) 180 endif() 181 182 # On most UNIX like platforms g++ and clang++ define _GNU_SOURCE as a 183 # predefined macro, which turns on all of the wonderful libc extensions. 184 # However g++ doesn't do this in Cygwin so we have to define it ourselfs 185 # since we depend on GNU/POSIX/BSD extensions. 186 if (CYGWIN) 187 add_definitions(-D_GNU_SOURCE=1) 188 endif() 189 190 if (QNXNTO) 191 add_definitions(-D_QNX_SOURCE) 192 endif() 193 194 # Link time optimisation 195 if (BENCHMARK_ENABLE_LTO) 196 add_cxx_compiler_flag(-flto) 197 add_cxx_compiler_flag(-Wno-lto-type-mismatch) 198 if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU") 199 find_program(GCC_AR gcc-ar) 200 if (GCC_AR) 201 set(CMAKE_AR ${GCC_AR}) 202 endif() 203 find_program(GCC_RANLIB gcc-ranlib) 204 if (GCC_RANLIB) 205 set(CMAKE_RANLIB ${GCC_RANLIB}) 206 endif() 207 elseif("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang") 208 include(llvm-toolchain) 209 endif() 210 endif() 211 212 # Coverage build type 213 set(BENCHMARK_CXX_FLAGS_COVERAGE "${CMAKE_CXX_FLAGS_DEBUG}" 214 CACHE STRING "Flags used by the C++ compiler during coverage builds." 215 FORCE) 216 set(BENCHMARK_EXE_LINKER_FLAGS_COVERAGE "${CMAKE_EXE_LINKER_FLAGS_DEBUG}" 217 CACHE STRING "Flags used for linking binaries during coverage builds." 218 FORCE) 219 set(BENCHMARK_SHARED_LINKER_FLAGS_COVERAGE "${CMAKE_SHARED_LINKER_FLAGS_DEBUG}" 220 CACHE STRING "Flags used by the shared libraries linker during coverage builds." 221 FORCE) 222 mark_as_advanced( 223 BENCHMARK_CXX_FLAGS_COVERAGE 224 BENCHMARK_EXE_LINKER_FLAGS_COVERAGE 225 BENCHMARK_SHARED_LINKER_FLAGS_COVERAGE) 226 set(CMAKE_BUILD_TYPE "${CMAKE_BUILD_TYPE}" CACHE STRING 227 "Choose the type of build, options are: None Debug Release RelWithDebInfo MinSizeRel Coverage.") 228 add_cxx_compiler_flag(--coverage COVERAGE) 229endif() 230 231if (BENCHMARK_USE_LIBCXX) 232 if ("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang") 233 add_cxx_compiler_flag(-stdlib=libc++) 234 elseif ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU" OR 235 "${CMAKE_CXX_COMPILER_ID}" STREQUAL "Intel") 236 add_cxx_compiler_flag(-nostdinc++) 237 message(WARNING "libc++ header path must be manually specified using CMAKE_CXX_FLAGS") 238 # Adding -nodefaultlibs directly to CMAKE_<TYPE>_LINKER_FLAGS will break 239 # configuration checks such as 'find_package(Threads)' 240 list(APPEND BENCHMARK_CXX_LINKER_FLAGS -nodefaultlibs) 241 # -lc++ cannot be added directly to CMAKE_<TYPE>_LINKER_FLAGS because 242 # linker flags appear before all linker inputs and -lc++ must appear after. 243 list(APPEND BENCHMARK_CXX_LIBRARIES c++) 244 else() 245 message(FATAL_ERROR "-DBENCHMARK_USE_LIBCXX:BOOL=ON is not supported for compiler") 246 endif() 247endif(BENCHMARK_USE_LIBCXX) 248 249set(EXTRA_CXX_FLAGS "") 250if (WIN32 AND "${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang") 251 # Clang on Windows fails to compile the regex feature check under C++11 252 set(EXTRA_CXX_FLAGS "-DCMAKE_CXX_STANDARD=14") 253endif() 254 255# C++ feature checks 256# Determine the correct regular expression engine to use 257cxx_feature_check(STD_REGEX ${EXTRA_CXX_FLAGS}) 258cxx_feature_check(GNU_POSIX_REGEX ${EXTRA_CXX_FLAGS}) 259cxx_feature_check(POSIX_REGEX ${EXTRA_CXX_FLAGS}) 260if(NOT HAVE_STD_REGEX AND NOT HAVE_GNU_POSIX_REGEX AND NOT HAVE_POSIX_REGEX) 261 message(FATAL_ERROR "Failed to determine the source files for the regular expression backend") 262endif() 263if (NOT BENCHMARK_ENABLE_EXCEPTIONS AND HAVE_STD_REGEX 264 AND NOT HAVE_GNU_POSIX_REGEX AND NOT HAVE_POSIX_REGEX) 265 message(WARNING "Using std::regex with exceptions disabled is not fully supported") 266endif() 267 268cxx_feature_check(STEADY_CLOCK) 269# Ensure we have pthreads 270set(THREADS_PREFER_PTHREAD_FLAG ON) 271find_package(Threads REQUIRED) 272 273# Set up directories 274include_directories(${PROJECT_SOURCE_DIR}/include) 275 276# Build the targets 277add_subdirectory(src) 278 279if (BENCHMARK_ENABLE_TESTING) 280 enable_testing() 281 if (BENCHMARK_ENABLE_GTEST_TESTS AND 282 NOT (TARGET gtest AND TARGET gtest_main AND 283 TARGET gmock AND TARGET gmock_main)) 284 include(GoogleTest) 285 endif() 286 add_subdirectory(test) 287endif() 288