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)
19if(NOT MSVC)
20  option(BENCHMARK_BUILD_32_BITS "Build a 32 bit version of the library." OFF)
21else()
22  set(BENCHMARK_BUILD_32_BITS OFF CACHE BOOL "Build a 32 bit version of the library - unsupported when using MSVC)" FORCE)
23endif()
24option(BENCHMARK_ENABLE_INSTALL "Enable installation of benchmark. (Projects embedding benchmark may want to turn this OFF.)" ON)
25
26# Allow unmet dependencies to be met using CMake's ExternalProject mechanics, which
27# may require downloading the source code.
28option(BENCHMARK_DOWNLOAD_DEPENDENCIES "Allow the downloading and in-tree building of unmet dependencies" OFF)
29
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.
32option(BENCHMARK_ENABLE_GTEST_TESTS "Enable building the unit tests which depend on gtest" ON)
33
34set(ENABLE_ASSEMBLY_TESTS_DEFAULT OFF)
35function(should_enable_assembly_tests)
36  if(CMAKE_BUILD_TYPE)
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.
41      return()
42    endif()
43  endif()
44  if (MSVC)
45    return()
46  elseif(NOT CMAKE_SYSTEM_PROCESSOR MATCHES "x86_64")
47    return()
48  elseif(NOT CMAKE_SIZEOF_VOID_P EQUAL 8)
49    # FIXME: Make these work on 32 bit builds
50    return()
51  elseif(BENCHMARK_BUILD_32_BITS)
52     # FIXME: Make these work on 32 bit builds
53    return()
54  endif()
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}")
59  else()
60    message(STATUS "Failed to find LLVM FileCheck")
61    return()
62  endif()
63  set(ENABLE_ASSEMBLY_TESTS_DEFAULT ON PARENT_SCOPE)
64endfunction()
65should_enable_assembly_tests()
66
67# This option disables the building and running of the assembly verification tests
68option(BENCHMARK_ENABLE_ASSEMBLY_TESTS "Enable building and running the assembly tests"
69    ${ENABLE_ASSEMBLY_TESTS_DEFAULT})
70
71# Make sure we can import out CMake functions
72list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake/Modules")
73list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake")
74
75
76# Read the git tags to determine the project version
77include(GetGitVersion)
78get_git_version(GIT_VERSION)
79
80# Tell the user what versions we are using
81string(REGEX MATCH "[0-9]+\\.[0-9]+\\.[0-9]+" VERSION ${GIT_VERSION})
82message(STATUS "Version: ${VERSION}")
83
84# The version of the libraries
85set(GENERIC_LIB_VERSION ${VERSION})
86string(SUBSTRING ${VERSION} 0 1 GENERIC_LIB_SOVERSION)
87
88# Import our CMake modules
89include(CheckCXXCompilerFlag)
90include(AddCXXCompilerFlag)
91include(CXXFeatureCheck)
92
93if (BENCHMARK_BUILD_32_BITS)
94  add_required_cxx_compiler_flag(-m32)
95endif()
96
97if (MSVC)
98  # Turn compiler warnings up to 11
99  string(REGEX REPLACE "[-/]W[1-4]" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
100  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /W4")
101  add_definitions(-D_CRT_SECURE_NO_WARNINGS)
102
103  if (NOT BENCHMARK_ENABLE_EXCEPTIONS)
104    add_cxx_compiler_flag(-EHs-)
105    add_cxx_compiler_flag(-EHa-)
106    add_definitions(-D_HAS_EXCEPTIONS=0)
107  endif()
108  # Link time optimisation
109  if (BENCHMARK_ENABLE_LTO)
110    set(CMAKE_CXX_FLAGS_RELEASE "${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 "${CMAKE_EXE_LINKER_FLAGS_RELEASE} /LTCG")
114
115    set(CMAKE_CXX_FLAGS_RELWITHDEBINFO "${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")
122
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")
127  endif()
128else()
129  # Try and enable C++11. Don't use C++14 because it doesn't work in some
130  # configurations.
131  add_cxx_compiler_flag(-std=c++11)
132  if (NOT HAVE_CXX_FLAG_STD_CXX11)
133    add_cxx_compiler_flag(-std=c++0x)
134  endif()
135
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)
155  endif()
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)
162  endif()
163
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)
167    endif()
168  endif()
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)
175  endif()
176
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.
181  if (CYGWIN)
182    add_definitions(-D_GNU_SOURCE=1)
183  endif()
184
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)
190      if (GCC_AR)
191        set(CMAKE_AR ${GCC_AR})
192      endif()
193      find_program(GCC_RANLIB gcc-ranlib)
194      if (GCC_RANLIB)
195        set(CMAKE_RANLIB ${GCC_RANLIB})
196      endif()
197    elseif("${CMAKE_C_COMPILER_ID}" MATCHES "Clang")
198      include(llvm-toolchain)
199    endif()
200  endif()
201
202  # Coverage build type
203  set(BENCHMARK_CXX_FLAGS_COVERAGE "${CMAKE_CXX_FLAGS_DEBUG}"
204    CACHE STRING "Flags used by the C++ compiler during coverage builds."
205    FORCE)
206  set(BENCHMARK_EXE_LINKER_FLAGS_COVERAGE "${CMAKE_EXE_LINKER_FLAGS_DEBUG}"
207    CACHE STRING "Flags used for linking binaries during coverage builds."
208    FORCE)
209  set(BENCHMARK_SHARED_LINKER_FLAGS_COVERAGE "${CMAKE_SHARED_LINKER_FLAGS_DEBUG}"
210    CACHE STRING "Flags used by the shared libraries linker during coverage builds."
211    FORCE)
212  mark_as_advanced(
213    BENCHMARK_CXX_FLAGS_COVERAGE
214    BENCHMARK_EXE_LINKER_FLAGS_COVERAGE
215    BENCHMARK_SHARED_LINKER_FLAGS_COVERAGE)
216  set(CMAKE_BUILD_TYPE "${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)
219endif()
220
221if (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          "${CMAKE_CXX_COMPILER_ID}" STREQUAL "Intel")
226    add_cxx_compiler_flag(-nostdinc++)
227    message(WARNING "libc++ header path must be manually specified using CMAKE_CXX_FLAGS")
228    # Adding -nodefaultlibs directly to CMAKE_<TYPE>_LINKER_FLAGS will break
229    # configuration checks such as 'find_package(Threads)'
230    list(APPEND BENCHMARK_CXX_LINKER_FLAGS -nodefaultlibs)
231    # -lc++ cannot be added directly to CMAKE_<TYPE>_LINKER_FLAGS because
232    # linker flags appear before all linker inputs and -lc++ must appear after.
233    list(APPEND BENCHMARK_CXX_LIBRARIES c++)
234  else()
235    message(FATAL_ERROR "-DBENCHMARK_USE_LIBCXX:BOOL=ON is not supported for compiler")
236  endif()
237endif(BENCHMARK_USE_LIBCXX)
238
239# C++ feature checks
240# Determine the correct regular expression engine to use
241cxx_feature_check(STD_REGEX)
242cxx_feature_check(GNU_POSIX_REGEX)
243cxx_feature_check(POSIX_REGEX)
244if(NOT HAVE_STD_REGEX AND NOT HAVE_GNU_POSIX_REGEX AND NOT HAVE_POSIX_REGEX)
245  message(FATAL_ERROR "Failed to determine the source files for the regular expression backend")
246endif()
247if (NOT BENCHMARK_ENABLE_EXCEPTIONS AND HAVE_STD_REGEX
248        AND NOT HAVE_GNU_POSIX_REGEX AND NOT HAVE_POSIX_REGEX)
249  message(WARNING "Using std::regex with exceptions disabled is not fully supported")
250endif()
251cxx_feature_check(STEADY_CLOCK)
252# Ensure we have pthreads
253find_package(Threads REQUIRED)
254
255# Set up directories
256include_directories(${PROJECT_SOURCE_DIR}/include)
257
258# Build the targets
259add_subdirectory(src)
260
261if (BENCHMARK_ENABLE_TESTING)
262  enable_testing()
263  if (BENCHMARK_ENABLE_GTEST_TESTS)
264    include(HandleGTest)
265  endif()
266  add_subdirectory(test)
267endif()
268