1
2include(split_list)
3
4macro(build_external_gtest)
5  include(ExternalProject)
6  set(GTEST_FLAGS "")
7  if (BENCHMARK_USE_LIBCXX)
8    if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
9      list(APPEND GTEST_FLAGS -stdlib=libc++)
10    else()
11      message(WARNING "Unsupported compiler (${CMAKE_CXX_COMPILER}) when using libc++")
12    endif()
13  endif()
14  if (BENCHMARK_BUILD_32_BITS)
15    list(APPEND GTEST_FLAGS -m32)
16  endif()
17  if (NOT "${CMAKE_CXX_FLAGS}" STREQUAL "")
18    list(APPEND GTEST_FLAGS ${CMAKE_CXX_FLAGS})
19  endif()
20  string(TOUPPER "${CMAKE_BUILD_TYPE}" GTEST_BUILD_TYPE)
21  if ("${GTEST_BUILD_TYPE}" STREQUAL "COVERAGE")
22    set(GTEST_BUILD_TYPE "DEBUG")
23  endif()
24  # FIXME: Since 10/Feb/2017 the googletest trunk has had a bug where
25  # -Werror=unused-function fires during the build on OS X. This is a temporary
26  # workaround to keep our travis bots from failing. It should be removed
27  # once gtest is fixed.
28  if (NOT "${CMAKE_CXX_COMPILER_ID}" STREQUAL "MSVC")
29    list(APPEND GTEST_FLAGS "-Wno-unused-function")
30  endif()
31  split_list(GTEST_FLAGS)
32  set(EXCLUDE_FROM_ALL_OPT "")
33  set(EXCLUDE_FROM_ALL_VALUE "")
34  if (${CMAKE_VERSION} VERSION_GREATER "3.0.99")
35      set(EXCLUDE_FROM_ALL_OPT "EXCLUDE_FROM_ALL")
36      set(EXCLUDE_FROM_ALL_VALUE "ON")
37  endif()
38  ExternalProject_Add(googletest
39      ${EXCLUDE_FROM_ALL_OPT} ${EXCLUDE_FROM_ALL_VALUE}
40      GIT_REPOSITORY https://github.com/google/googletest.git
41      GIT_TAG master
42      PREFIX "${CMAKE_BINARY_DIR}/googletest"
43      INSTALL_DIR "${CMAKE_BINARY_DIR}/googletest"
44      CMAKE_CACHE_ARGS
45        -DCMAKE_BUILD_TYPE:STRING=${GTEST_BUILD_TYPE}
46        -DCMAKE_C_COMPILER:STRING=${CMAKE_C_COMPILER}
47        -DCMAKE_CXX_COMPILER:STRING=${CMAKE_CXX_COMPILER}
48        -DCMAKE_INSTALL_PREFIX:PATH=<INSTALL_DIR>
49        -DCMAKE_INSTALL_LIBDIR:PATH=<INSTALL_DIR>/lib
50        -DCMAKE_CXX_FLAGS:STRING=${GTEST_FLAGS}
51        -Dgtest_force_shared_crt:BOOL=ON
52      )
53
54  ExternalProject_Get_Property(googletest install_dir)
55  set(GTEST_INCLUDE_DIRS ${install_dir}/include)
56  file(MAKE_DIRECTORY ${GTEST_INCLUDE_DIRS})
57
58  set(LIB_SUFFIX "${CMAKE_STATIC_LIBRARY_SUFFIX}")
59  set(LIB_PREFIX "${CMAKE_STATIC_LIBRARY_PREFIX}")
60  if("${GTEST_BUILD_TYPE}" STREQUAL "DEBUG")
61    set(LIB_SUFFIX "d${CMAKE_STATIC_LIBRARY_SUFFIX}")
62  endif()
63
64  # Use gmock_main instead of gtest_main because it initializes gtest as well.
65  # Note: The libraries are listed in reverse order of their dependancies.
66  foreach(LIB gtest gmock gmock_main)
67    add_library(${LIB} UNKNOWN IMPORTED)
68    set_target_properties(${LIB} PROPERTIES
69      IMPORTED_LOCATION ${install_dir}/lib/${LIB_PREFIX}${LIB}${LIB_SUFFIX}
70      INTERFACE_INCLUDE_DIRECTORIES ${GTEST_INCLUDE_DIRS}
71      INTERFACE_LINK_LIBRARIES "${GTEST_BOTH_LIBRARIES}"
72    )
73    add_dependencies(${LIB} googletest)
74    list(APPEND GTEST_BOTH_LIBRARIES ${LIB})
75  endforeach()
76endmacro(build_external_gtest)
77
78if (BENCHMARK_ENABLE_GTEST_TESTS)
79  if (IS_DIRECTORY ${CMAKE_SOURCE_DIR}/googletest)
80    set(GTEST_ROOT "${CMAKE_SOURCE_DIR}/googletest")
81    set(INSTALL_GTEST OFF CACHE INTERNAL "")
82    set(INSTALL_GMOCK OFF CACHE INTERNAL "")
83    add_subdirectory(${CMAKE_SOURCE_DIR}/googletest)
84    set(GTEST_BOTH_LIBRARIES gtest gmock gmock_main)
85    foreach(HEADER test mock)
86      # CMake 2.8 and older don't respect INTERFACE_INCLUDE_DIRECTORIES, so we
87      # have to add the paths ourselves.
88      set(HFILE g${HEADER}/g${HEADER}.h)
89      set(HPATH ${GTEST_ROOT}/google${HEADER}/include)
90      find_path(HEADER_PATH_${HEADER} ${HFILE}
91          NO_DEFAULT_PATHS
92          HINTS ${HPATH}
93      )
94      if (NOT HEADER_PATH_${HEADER})
95        message(FATAL_ERROR "Failed to find header ${HFILE} in ${HPATH}")
96      endif()
97      list(APPEND GTEST_INCLUDE_DIRS ${HEADER_PATH_${HEADER}})
98    endforeach()
99  elseif(BENCHMARK_DOWNLOAD_DEPENDENCIES)
100    build_external_gtest()
101  else()
102    find_package(GTest REQUIRED)
103    find_path(GMOCK_INCLUDE_DIRS gmock/gmock.h
104        HINTS ${GTEST_INCLUDE_DIRS})
105    if (NOT GMOCK_INCLUDE_DIRS)
106      message(FATAL_ERROR "Failed to find header gmock/gmock.h with hint ${GTEST_INCLUDE_DIRS}")
107    endif()
108    set(GTEST_INCLUDE_DIRS ${GTEST_INCLUDE_DIRS} ${GMOCK_INCLUDE_DIRS})
109    # FIXME: We don't currently require the gmock library to build the tests,
110    # and it's likely we won't find it, so we don't try. As long as we've
111    # found the gmock/gmock.h header and gtest_main that should be good enough.
112  endif()
113endif()
114