1 cmake_minimum_required (VERSION 2.8.12)
7 CMP0056 # export EXE_LINKER_FLAGS to try_run
8 CMP0057 # Support no if() IN_LIST operator
11 cmake_policy(SET ${p} NEW)
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)
20 option(BENCHMARK_BUILD_32_BITS "Build a 32 bit version of the library." OFF)
22 set(BENCHMARK_BUILD_32_BITS OFF CACHE BOOL "Build a 32 bit version of the library - unsupported when using MSVC)" FORCE)
24 option(BENCHMARK_ENABLE_INSTALL "Enable installation of benchmark. (Projects embedding benchmark may want to turn this OFF.)" ON)
26 # Allow unmet dependencies to be met using CMake's ExternalProject mechanics, which
27 # may require downloading the source code.
28 option(BENCHMARK_DOWNLOAD_DEPENDENCIES "Allow the downloading and in-tree building of unmet dependencies" OFF)
30 # This option can be used to disable building and running unit tests which depend on gtest
31 # in cases where it is not possible to build or find a valid version of gtest.
32 option(BENCHMARK_ENABLE_GTEST_TESTS "Enable building the unit tests which depend on gtest" ON)
34 set(ENABLE_ASSEMBLY_TESTS_DEFAULT OFF)
35 function(should_enable_assembly_tests)
37 string(TOLOWER ${CMAKE_BUILD_TYPE} CMAKE_BUILD_TYPE_LOWER)
38 if (${CMAKE_BUILD_TYPE_LOWER} MATCHES "coverage")
39 # FIXME: The --coverage flag needs to be removed when building assembly
40 # tests for this to work.
46 elseif(NOT CMAKE_SYSTEM_PROCESSOR MATCHES "x86_64")
48 elseif(NOT CMAKE_SIZEOF_VOID_P EQUAL 8)
49 # FIXME: Make these work on 32 bit builds
51 elseif(BENCHMARK_BUILD_32_BITS)
52 # FIXME: Make these work on 32 bit builds
55 find_program(LLVM_FILECHECK_EXE FileCheck)
56 if (LLVM_FILECHECK_EXE)
57 set(LLVM_FILECHECK_EXE "${LLVM_FILECHECK_EXE}" CACHE PATH "llvm filecheck" FORCE)
58 message(STATUS "LLVM FileCheck Found: ${LLVM_FILECHECK_EXE}")
60 message(STATUS "Failed to find LLVM FileCheck")
63 set(ENABLE_ASSEMBLY_TESTS_DEFAULT ON PARENT_SCOPE)
65 should_enable_assembly_tests()
67 # This option disables the building and running of the assembly verification tests
68 option(BENCHMARK_ENABLE_ASSEMBLY_TESTS "Enable building and running the assembly tests"
69 ${ENABLE_ASSEMBLY_TESTS_DEFAULT})
71 # Make sure we can import out CMake functions
72 list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake/Modules")
73 list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake")
76 # Read the git tags to determine the project version
77 include(GetGitVersion)
78 get_git_version(GIT_VERSION)
80 # Tell the user what versions we are using
81 string(REGEX MATCH "[0-9]+\\.[0-9]+\\.[0-9]+" VERSION ${GIT_VERSION})
82 message(STATUS "Version: ${VERSION}")
84 # The version of the libraries
85 set(GENERIC_LIB_VERSION ${VERSION})
86 string(SUBSTRING ${VERSION} 0 1 GENERIC_LIB_SOVERSION)
88 # Import our CMake modules
89 include(CheckCXXCompilerFlag)
90 include(AddCXXCompilerFlag)
91 include(CXXFeatureCheck)
93 if (BENCHMARK_BUILD_32_BITS)
94 add_required_cxx_compiler_flag(-m32)
98 # Turn compiler warnings up to 11
99 string(REGEX REPLACE "[-/]W[1-4]" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
100 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /W4")
101 add_definitions(-D_CRT_SECURE_NO_WARNINGS)
103 if (NOT BENCHMARK_ENABLE_EXCEPTIONS)
104 add_cxx_compiler_flag(-EHs-)
105 add_cxx_compiler_flag(-EHa-)
106 add_definitions(-D_HAS_EXCEPTIONS=0)
108 # Link time optimisation
109 if (BENCHMARK_ENABLE_LTO)
110 set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} /GL")
111 set(CMAKE_STATIC_LINKER_FLAGS_RELEASE "${CMAKE_STATIC_LINKER_FLAGS_RELEASE} /LTCG")
112 set(CMAKE_SHARED_LINKER_FLAGS_RELEASE "${CMAKE_SHARED_LINKER_FLAGS_RELEASE} /LTCG")
113 set(CMAKE_EXE_LINKER_FLAGS_RELEASE "${CMAKE_EXE_LINKER_FLAGS_RELEASE} /LTCG")
115 set(CMAKE_CXX_FLAGS_RELWITHDEBINFO "${CMAKE_CXX_FLAGS_RELWITHDEBINFO} /GL")
116 string(REGEX REPLACE "[-/]INCREMENTAL" "/INCREMENTAL:NO" CMAKE_STATIC_LINKER_FLAGS_RELWITHDEBINFO "${CMAKE_STATIC_LINKER_FLAGS_RELWITHDEBINFO}")
117 set(CMAKE_STATIC_LINKER_FLAGS_RELWITHDEBINFO "${CMAKE_STATIC_LINKER_FLAGS_RELWITHDEBINFO} /LTCG")
118 string(REGEX REPLACE "[-/]INCREMENTAL" "/INCREMENTAL:NO" CMAKE_SHARED_LINKER_FLAGS_RELWITHDEBINFO "${CMAKE_SHARED_LINKER_FLAGS_RELWITHDEBINFO}")
119 set(CMAKE_SHARED_LINKER_FLAGS_RELWITHDEBINFO "${CMAKE_SHARED_LINKER_FLAGS_RELWITHDEBINFO} /LTCG")
120 string(REGEX REPLACE "[-/]INCREMENTAL" "/INCREMENTAL:NO" CMAKE_EXE_LINKER_FLAGS_RELWITHDEBINFO "${CMAKE_EXE_LINKER_FLAGS_RELWITHDEBINFO}")
121 set(CMAKE_EXE_LINKER_FLAGS_RELWITHDEBINFO "${CMAKE_EXE_LINKER_FLAGS_RELWITHDEBINFO} /LTCG")
123 set(CMAKE_CXX_FLAGS_MINSIZEREL "${CMAKE_CXX_FLAGS_MINSIZEREL} /GL")
124 set(CMAKE_STATIC_LINKER_FLAGS_MINSIZEREL "${CMAKE_STATIC_LINKER_FLAGS_MINSIZEREL} /LTCG")
125 set(CMAKE_SHARED_LINKER_FLAGS_MINSIZEREL "${CMAKE_SHARED_LINKER_FLAGS_MINSIZEREL} /LTCG")
126 set(CMAKE_EXE_LINKER_FLAGS_MINSIZEREL "${CMAKE_EXE_LINKER_FLAGS_MINSIZEREL} /LTCG")
129 # Try and enable C++11. Don't use C++14 because it doesn't work in some
131 add_cxx_compiler_flag(-std=c++11)
132 if (NOT HAVE_CXX_FLAG_STD_CXX11)
133 add_cxx_compiler_flag(-std=c++0x)
136 # Turn compiler warnings up to 11
137 add_cxx_compiler_flag(-Wall)
138 add_cxx_compiler_flag(-Wextra)
139 add_cxx_compiler_flag(-Wshadow)
140 add_cxx_compiler_flag(-Werror RELEASE)
141 add_cxx_compiler_flag(-Werror RELWITHDEBINFO)
142 add_cxx_compiler_flag(-Werror MINSIZEREL)
143 add_cxx_compiler_flag(-pedantic)
144 add_cxx_compiler_flag(-pedantic-errors)
145 add_cxx_compiler_flag(-Wshorten-64-to-32)
146 add_cxx_compiler_flag(-fstrict-aliasing)
147 # Disable warnings regarding deprecated parts of the library while building
148 # and testing those parts of the library.
149 add_cxx_compiler_flag(-Wno-deprecated-declarations)
150 if (CMAKE_CXX_COMPILER_ID STREQUAL "Intel")
151 # Intel silently ignores '-Wno-deprecated-declarations',
152 # warning no. 1786 must be explicitly disabled.
153 # See #631 for rationale.
154 add_cxx_compiler_flag(-wd1786)
156 # Disable deprecation warnings for release builds (when -Werror is enabled).
157 add_cxx_compiler_flag(-Wno-deprecated RELEASE)
158 add_cxx_compiler_flag(-Wno-deprecated RELWITHDEBINFO)
159 add_cxx_compiler_flag(-Wno-deprecated MINSIZEREL)
160 if (NOT BENCHMARK_ENABLE_EXCEPTIONS)
161 add_cxx_compiler_flag(-fno-exceptions)
164 if (HAVE_CXX_FLAG_FSTRICT_ALIASING)
165 if (NOT CMAKE_CXX_COMPILER_ID STREQUAL "Intel") #ICC17u2: Many false positives for Wstrict-aliasing
166 add_cxx_compiler_flag(-Wstrict-aliasing)
169 # ICC17u2: overloaded virtual function "benchmark::Fixture::SetUp" is only partially overridden
170 # (because of deprecated overload)
171 add_cxx_compiler_flag(-wd654)
172 add_cxx_compiler_flag(-Wthread-safety)
173 if (HAVE_CXX_FLAG_WTHREAD_SAFETY)
174 cxx_feature_check(THREAD_SAFETY_ATTRIBUTES)
177 # On most UNIX like platforms g++ and clang++ define _GNU_SOURCE as a
178 # predefined macro, which turns on all of the wonderful libc extensions.
179 # However g++ doesn't do this in Cygwin so we have to define it ourselfs
180 # since we depend on GNU/POSIX/BSD extensions.
182 add_definitions(-D_GNU_SOURCE=1)
185 # Link time optimisation
186 if (BENCHMARK_ENABLE_LTO)
187 add_cxx_compiler_flag(-flto)
188 if ("${CMAKE_C_COMPILER_ID}" STREQUAL "GNU")
189 find_program(GCC_AR gcc-ar)
191 set(CMAKE_AR ${GCC_AR})
193 find_program(GCC_RANLIB gcc-ranlib)
195 set(CMAKE_RANLIB ${GCC_RANLIB})
197 elseif("${CMAKE_C_COMPILER_ID}" MATCHES "Clang")
198 include(llvm-toolchain)
202 # Coverage build type
203 set(BENCHMARK_CXX_FLAGS_COVERAGE "${CMAKE_CXX_FLAGS_DEBUG}"
204 CACHE STRING "Flags used by the C++ compiler during coverage builds."
206 set(BENCHMARK_EXE_LINKER_FLAGS_COVERAGE "${CMAKE_EXE_LINKER_FLAGS_DEBUG}"
207 CACHE STRING "Flags used for linking binaries during coverage builds."
209 set(BENCHMARK_SHARED_LINKER_FLAGS_COVERAGE "${CMAKE_SHARED_LINKER_FLAGS_DEBUG}"
210 CACHE STRING "Flags used by the shared libraries linker during coverage builds."
213 BENCHMARK_CXX_FLAGS_COVERAGE
214 BENCHMARK_EXE_LINKER_FLAGS_COVERAGE
215 BENCHMARK_SHARED_LINKER_FLAGS_COVERAGE)
216 set(CMAKE_BUILD_TYPE "${CMAKE_BUILD_TYPE}" CACHE STRING
217 "Choose the type of build, options are: None Debug Release RelWithDebInfo MinSizeRel Coverage.")
218 add_cxx_compiler_flag(--coverage COVERAGE)
221 if (BENCHMARK_USE_LIBCXX)
222 if ("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang")
223 add_cxx_compiler_flag(-stdlib=libc++)
224 elseif ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU" OR
225 "${CMAKE_CXX_COMPILER_ID}" STREQUAL "Intel")
226 add_cxx_compiler_flag(-nostdinc++)
227 message(WARNING "libc++ header path must be manually specified using CMAKE_CXX_FLAGS")
228 # Adding -nodefaultlibs directly to CMAKE_<TYPE>_LINKER_FLAGS will break
229 # configuration checks such as 'find_package(Threads)'
230 list(APPEND BENCHMARK_CXX_LINKER_FLAGS -nodefaultlibs)
231 # -lc++ cannot be added directly to CMAKE_<TYPE>_LINKER_FLAGS because
232 # linker flags appear before all linker inputs and -lc++ must appear after.
233 list(APPEND BENCHMARK_CXX_LIBRARIES c++)
235 message(FATAL_ERROR "-DBENCHMARK_USE_LIBCXX:BOOL=ON is not supported for compiler")
237 endif(BENCHMARK_USE_LIBCXX)
240 # Determine the correct regular expression engine to use
241 cxx_feature_check(STD_REGEX)
242 cxx_feature_check(GNU_POSIX_REGEX)
243 cxx_feature_check(POSIX_REGEX)
244 if(NOT HAVE_STD_REGEX AND NOT HAVE_GNU_POSIX_REGEX AND NOT HAVE_POSIX_REGEX)
245 message(FATAL_ERROR "Failed to determine the source files for the regular expression backend")
247 if (NOT BENCHMARK_ENABLE_EXCEPTIONS AND HAVE_STD_REGEX
248 AND NOT HAVE_GNU_POSIX_REGEX AND NOT HAVE_POSIX_REGEX)
249 message(WARNING "Using std::regex with exceptions disabled is not fully supported")
251 cxx_feature_check(STEADY_CLOCK)
252 # Ensure we have pthreads
253 find_package(Threads REQUIRED)
256 include_directories(${PROJECT_SOURCE_DIR}/include)
259 add_subdirectory(src)
261 if (BENCHMARK_ENABLE_TESTING)
263 if (BENCHMARK_ENABLE_GTEST_TESTS)
266 add_subdirectory(test)