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