cmake/Modules/FindGTest.cmake

# Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
# file Copyright.txt or https://cmake.org/licensing for details.

#.rst:
# FindGTest
# ---------
#
# Locate the Google C++ Testing Framework.
#
# Imported targets
# ^^^^^^^^^^^^^^^^
#
# This module defines the following :prop_tgt:`IMPORTED` targets:
#
# ``GTest::GTest``
#   The Google Test ``gtest`` library, if found; adds Thread::Thread
#   automatically
# ``GTest::Main``
#   The Google Test ``gtest_main`` library, if found
#
#
# Result variables
# ^^^^^^^^^^^^^^^^
#
# This module will set the following variables in your project:
#
# ``GTEST_FOUND``
#   Found the Google Testing framework
# ``GTEST_INCLUDE_DIRS``
#   the directory containing the Google Test headers
#
# The library variables below are set as normal variables.  These
# contain debug/optimized keywords when a debugging library is found.
#
# ``GTEST_LIBRARIES``
#   The Google Test ``gtest`` library; note it also requires linking
#   with an appropriate thread library
# ``GTEST_MAIN_LIBRARIES``
#   The Google Test ``gtest_main`` library
# ``GTEST_BOTH_LIBRARIES``
#   Both ``gtest`` and ``gtest_main``
#
# Cache variables
# ^^^^^^^^^^^^^^^
#
# The following cache variables may also be set:
#
# ``GTEST_ROOT``
#   The root directory of the Google Test installation (may also be
#   set as an environment variable)
# ``GTEST_MSVC_SEARCH``
#   If compiling with MSVC, this variable can be set to ``MT`` or
#   ``MD`` (the default) to enable searching a GTest build tree
#
#
# Example usage
# ^^^^^^^^^^^^^
#
# ::
#
#     enable_testing()
#     find_package(GTest REQUIRED)
#
#     add_executable(foo foo.cc)
#     target_link_libraries(foo GTest::GTest GTest::Main)
#
#     add_test(AllTestsInFoo foo)
#
#
# Deeper integration with CTest
# ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
#
# See :module:`GoogleTest` for information on the :command:`gtest_add_tests`
# and :command:`gtest_discover_tests` commands.

include(${CMAKE_CURRENT_LIST_DIR}/GoogleTest.cmake)

function(__gtest_append_debugs _endvar _library)
    if(${_library} AND ${_library}_DEBUG)
        set(_output optimized ${${_library}} debug ${${_library}_DEBUG})
    else()
        set(_output ${${_library}})
    endif()
    set(${_endvar} ${_output} PARENT_SCOPE)
endfunction()

function(__gtest_find_library _name)
    find_library(${_name}
        NAMES ${ARGN}
        HINTS
            ENV GTEST_ROOT
            ${GTEST_ROOT}
        PATH_SUFFIXES ${_gtest_libpath_suffixes}
    )
    mark_as_advanced(${_name})
endfunction()

macro(__gtest_determine_windows_library_type _var)
    if(EXISTS "${${_var}}")
        file(TO_NATIVE_PATH "${${_var}}" _lib_path)
        get_filename_component(_name "${${_var}}" NAME_WE)
        file(STRINGS "${${_var}}" _match REGEX "${_name}\\.dll" LIMIT_COUNT 1)
        if(NOT _match STREQUAL "")
            set(${_var}_TYPE SHARED PARENT_SCOPE)
        else()
            set(${_var}_TYPE UNKNOWN PARENT_SCOPE)
        endif()
        return()
    endif()
endmacro()

function(__gtest_determine_library_type _var)
    if(WIN32)
        # For now, at least, only Windows really needs to know the library type
        __gtest_determine_windows_library_type(${_var})
        __gtest_determine_windows_library_type(${_var}_RELEASE)
        __gtest_determine_windows_library_type(${_var}_DEBUG)
    endif()
    # If we get here, no determination was made from the above checks
    set(${_var}_TYPE UNKNOWN PARENT_SCOPE)
endfunction()

function(__gtest_import_library _target _var _config)
    if(_config)
        set(_config_suffix "_${_config}")
    else()
        set(_config_suffix "")
    endif()

    set(_lib "${${_var}${_config_suffix}}")
    if(EXISTS "${_lib}")
        if(_config)
            set_property(TARGET ${_target} APPEND PROPERTY
                IMPORTED_CONFIGURATIONS ${_config})
        endif()
        set_target_properties(${_target} PROPERTIES
            IMPORTED_LINK_INTERFACE_LANGUAGES${_config_suffix} "CXX")
        if(WIN32 AND ${_var}_TYPE STREQUAL SHARED)
            set_target_properties(${_target} PROPERTIES
                IMPORTED_IMPLIB${_config_suffix} "${_lib}")
        else()
            set_target_properties(${_target} PROPERTIES
                IMPORTED_LOCATION${_config_suffix} "${_lib}")
        endif()
    endif()
endfunction()

#

if(NOT DEFINED GTEST_MSVC_SEARCH)
    set(GTEST_MSVC_SEARCH MD)
endif()

set(_gtest_libpath_suffixes lib)
if(MSVC)
    if(GTEST_MSVC_SEARCH STREQUAL "MD")
        list(APPEND _gtest_libpath_suffixes
            msvc/gtest-md/Debug
            msvc/gtest-md/Release
            msvc/x64/Debug
            msvc/x64/Release
            )
    elseif(GTEST_MSVC_SEARCH STREQUAL "MT")
        list(APPEND _gtest_libpath_suffixes
            msvc/gtest/Debug
            msvc/gtest/Release
            msvc/x64/Debug
            msvc/x64/Release
            )
    endif()
endif()


find_path(GTEST_INCLUDE_DIR gtest/gtest.h
    HINTS
        $ENV{GTEST_ROOT}/include
        ${GTEST_ROOT}/include
)
mark_as_advanced(GTEST_INCLUDE_DIR)

if(MSVC AND GTEST_MSVC_SEARCH STREQUAL "MD")
    # The provided /MD project files for Google Test add -md suffixes to the
    # library names.
    __gtest_find_library(GTEST_LIBRARY            gtest-md  gtest)
    __gtest_find_library(GTEST_LIBRARY_DEBUG      gtest-mdd gtestd)
    __gtest_find_library(GTEST_MAIN_LIBRARY       gtest_main-md  gtest_main)
    __gtest_find_library(GTEST_MAIN_LIBRARY_DEBUG gtest_main-mdd gtest_maind)
else()
    __gtest_find_library(GTEST_LIBRARY            gtest)
    __gtest_find_library(GTEST_LIBRARY_DEBUG      gtestd)
    __gtest_find_library(GTEST_MAIN_LIBRARY       gtest_main)
    __gtest_find_library(GTEST_MAIN_LIBRARY_DEBUG gtest_maind)
endif()

include(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake)
FIND_PACKAGE_HANDLE_STANDARD_ARGS(GTest DEFAULT_MSG GTEST_LIBRARY GTEST_INCLUDE_DIR GTEST_MAIN_LIBRARY)

if(GTEST_FOUND)
    set(GTEST_INCLUDE_DIRS ${GTEST_INCLUDE_DIR})
    __gtest_append_debugs(GTEST_LIBRARIES      GTEST_LIBRARY)
    __gtest_append_debugs(GTEST_MAIN_LIBRARIES GTEST_MAIN_LIBRARY)
    set(GTEST_BOTH_LIBRARIES ${GTEST_LIBRARIES} ${GTEST_MAIN_LIBRARIES})

    find_package(Threads QUIET)

    if(NOT TARGET GTest::GTest)
        __gtest_determine_library_type(GTEST_LIBRARY)
        add_library(GTest::GTest ${GTEST_LIBRARY_TYPE} IMPORTED)
        if(TARGET Threads::Threads)
            set_target_properties(GTest::GTest PROPERTIES
                INTERFACE_LINK_LIBRARIES Threads::Threads)
        endif()
        if(GTEST_LIBRARY_TYPE STREQUAL "SHARED")
            set_target_properties(GTest::GTest PROPERTIES
                INTERFACE_COMPILE_DEFINITIONS "GTEST_LINKED_AS_SHARED_LIBRARY=1")
        endif()
        if(GTEST_INCLUDE_DIRS)
            set_target_properties(GTest::GTest PROPERTIES
                INTERFACE_INCLUDE_DIRECTORIES "${GTEST_INCLUDE_DIRS}")
        endif()
        __gtest_import_library(GTest::GTest GTEST_LIBRARY "")
        __gtest_import_library(GTest::GTest GTEST_LIBRARY "RELEASE")
        __gtest_import_library(GTest::GTest GTEST_LIBRARY "DEBUG")
    endif()
    if(NOT TARGET GTest::Main)
        __gtest_determine_library_type(GTEST_MAIN_LIBRARY)
        add_library(GTest::Main ${GTEST_MAIN_LIBRARY_TYPE} IMPORTED)
        set_target_properties(GTest::Main PROPERTIES
            INTERFACE_LINK_LIBRARIES "GTest::GTest")
        __gtest_import_library(GTest::Main GTEST_MAIN_LIBRARY "")
        __gtest_import_library(GTest::Main GTEST_MAIN_LIBRARY "RELEASE")
        __gtest_import_library(GTest::Main GTEST_MAIN_LIBRARY "DEBUG")
    endif()
endif()