# Defines functions and macros useful for building Google Test and

# Google Mock.

#

# Note:

#

# - This file will be run twice when building Google Mock (once via

#   Google Test's CMakeLists.txt, and once via Google Mock's).

#   Therefore it shouldn't have any side effects other than defining

#   the functions and macros.

#

# - The functions/macros defined in this file may depend on Google

#   Test and Google Mock's option() definitions, and thus must be

#   called *after* the options have been defined.

# Tweaks CMake's default compiler/linker settings to suit Google Test's needs.

#

# This must be a macro(), as inside a function string() can only

# update variables in the function scope.

macro(fix_default_compiler_settings_)

  if (MSVC)

    # For MSVC, CMake sets certain flags to defaults we want to override.

    # This replacement code is taken from sample in the CMake Wiki at

    # http://www.cmake.org/Wiki/CMake_FAQ#Dynamic_Replace.

    foreach (flag_var

             CMAKE_CXX_FLAGS CMAKE_CXX_FLAGS_DEBUG CMAKE_CXX_FLAGS_RELEASE

             CMAKE_CXX_FLAGS_MINSIZEREL CMAKE_CXX_FLAGS_RELWITHDEBINFO)

      if (NOT BUILD_SHARED_LIBS AND NOT gtest_force_shared_crt)

        # When Google Test is built as a shared library, it should also use

        # shared runtime libraries.  Otherwise, it may end up with multiple

        # copies of runtime library data in different modules, resulting in

        # hard-to-find crashes. When it is built as a static library, it is

        # preferable to use CRT as static libraries, as we don't have to rely

        # on CRT DLLs being available. CMake always defaults to using shared

        # CRT libraries, so we override that default here.

        string(REPLACE "/MD" "-MT" ${flag_var} "${${flag_var}}")

      endif()

      # We prefer more strict warning checking for building Google Test.

      # Replaces /W3 with /W4 in defaults.

      string(REPLACE "/W3" "/W4" ${flag_var} "${${flag_var}}")

    endforeach()

  endif()

endmacro()

# Defines the compiler/linker flags used to build Google Test and

# Google Mock.  You can tweak these definitions to suit your need.  A

# variable's value is empty before it's explicitly assigned to.

macro(config_compiler_and_linker)

  if (NOT gtest_disable_pthreads)

    # Defines CMAKE_USE_PTHREADS_INIT and CMAKE_THREAD_LIBS_INIT.

    find_package(Threads)

  endif()

  fix_default_compiler_settings_()

  if (MSVC)

    # Newlines inside flags variables break CMake's NMake generator.

    # TODO(vladl@google.com): Add -RTCs and -RTCu to debug builds.

    set(cxx_base_flags "-GS -W4 -WX -wd4251 -wd4275 -nologo -J -Zi")

    if (MSVC_VERSION LESS 1400)  # 1400 is Visual Studio 2005

      # Suppress spurious warnings MSVC 7.1 sometimes issues.

      # Forcing value to bool.

      set(cxx_base_flags "${cxx_base_flags} -wd4800")

      # Copy constructor and assignment operator could not be generated.

      set(cxx_base_flags "${cxx_base_flags} -wd4511 -wd4512")

      # Compatibility warnings not applicable to Google Test.

      # Resolved overload was found by argument-dependent lookup.

      set(cxx_base_flags "${cxx_base_flags} -wd4675")

    endif()

    if (MSVC_VERSION LESS 1500)  # 1500 is Visual Studio 2008

      # Conditional expression is constant.

      # When compiling with /W4, we get several instances of C4127

      # (Conditional expression is constant). In our code, we disable that

      # warning on a case-by-case basis. However, on Visual Studio 2005,

      # the warning fires on std::list. Therefore on that compiler and earlier,

      # we disable the warning project-wide.

      set(cxx_base_flags "${cxx_base_flags} -wd4127")

    endif()

    if (NOT (MSVC_VERSION LESS 1700))  # 1700 is Visual Studio 2012.

      # Suppress "unreachable code" warning on VS 2012 and later.

      # http://stackoverflow.com/questions/3232669 explains the issue.

      set(cxx_base_flags "${cxx_base_flags} -wd4702")

    endif()

    if (NOT (MSVC_VERSION GREATER 1900))  # 1900 is Visual Studio 2015

      # BigObj required for tests.

      set(cxx_base_flags "${cxx_base_flags} -bigobj")

    endif()

    set(cxx_base_flags "${cxx_base_flags} -D_UNICODE -DUNICODE -DWIN32 -D_WIN32")

    set(cxx_base_flags "${cxx_base_flags} -DSTRICT -DWIN32_LEAN_AND_MEAN")

    set(cxx_exception_flags "-EHsc -D_HAS_EXCEPTIONS=1")

    set(cxx_no_exception_flags "-D_HAS_EXCEPTIONS=0")

    set(cxx_no_rtti_flags "-GR-")

  elseif (CMAKE_COMPILER_IS_GNUCXX)

    set(cxx_base_flags "-Wall -Wshadow")

    set(cxx_exception_flags "-fexceptions")

    set(cxx_no_exception_flags "-fno-exceptions")

    # Until version 4.3.2, GCC doesn't define a macro to indicate

    # whether RTTI is enabled.  Therefore we define GTEST_HAS_RTTI

    # explicitly.

    set(cxx_no_rtti_flags "-fno-rtti -DGTEST_HAS_RTTI=0")

    set(cxx_strict_flags

      "-Wextra -Wno-unused-parameter -Wno-missing-field-initializers")

  elseif (CMAKE_CXX_COMPILER_ID STREQUAL "SunPro")

    set(cxx_exception_flags "-features=except")

    # Sun Pro doesn't provide macros to indicate whether exceptions and

    # RTTI are enabled, so we define GTEST_HAS_* explicitly.

    set(cxx_no_exception_flags "-features=no%except -DGTEST_HAS_EXCEPTIONS=0")

    set(cxx_no_rtti_flags "-features=no%rtti -DGTEST_HAS_RTTI=0")

  elseif (CMAKE_CXX_COMPILER_ID STREQUAL "VisualAge" OR

      CMAKE_CXX_COMPILER_ID STREQUAL "XL")

    # CMake 2.8 changes Visual Age's compiler ID to "XL".

    set(cxx_exception_flags "-qeh")

    set(cxx_no_exception_flags "-qnoeh")

    # Until version 9.0, Visual Age doesn't define a macro to indicate

    # whether RTTI is enabled.  Therefore we define GTEST_HAS_RTTI

    # explicitly.

    set(cxx_no_rtti_flags "-qnortti -DGTEST_HAS_RTTI=0")

  elseif (CMAKE_CXX_COMPILER_ID STREQUAL "HP")

    set(cxx_base_flags "-AA -mt")

    set(cxx_exception_flags "-DGTEST_HAS_EXCEPTIONS=1")

    set(cxx_no_exception_flags "+noeh -DGTEST_HAS_EXCEPTIONS=0")

    # RTTI can not be disabled in HP aCC compiler.

    set(cxx_no_rtti_flags "")

  endif()

  if (CMAKE_USE_PTHREADS_INIT)  # The pthreads library is available and allowed.

    set(cxx_base_flags "${cxx_base_flags} -DGTEST_HAS_PTHREAD=1")

  else()

    set(cxx_base_flags "${cxx_base_flags} -DGTEST_HAS_PTHREAD=0")

  endif()

  # For building gtest's own tests and samples.

  set(cxx_exception "${CMAKE_CXX_FLAGS} ${cxx_base_flags} ${cxx_exception_flags}")

  set(cxx_no_exception

    "${CMAKE_CXX_FLAGS} ${cxx_base_flags} ${cxx_no_exception_flags}")

  set(cxx_default "${cxx_exception}")

  set(cxx_no_rtti "${cxx_default} ${cxx_no_rtti_flags}")

  set(cxx_use_own_tuple "${cxx_default} -DGTEST_USE_OWN_TR1_TUPLE=1")

  # For building the gtest libraries.

  set(cxx_strict "${cxx_default} ${cxx_strict_flags}")

endmacro()

# Defines the gtest & gtest_main libraries.  User tests should link

# with one of them.

function(cxx_library_with_type name type cxx_flags)

  # type can be either STATIC or SHARED to denote a static or shared library.

  # ARGN refers to additional arguments after 'cxx_flags'.

  add_library(${name} ${type} ${ARGN})

  set_target_properties(${name}

    PROPERTIES

    COMPILE_FLAGS "${cxx_flags}")

  if (BUILD_SHARED_LIBS OR type STREQUAL "SHARED")

    set_target_properties(${name}

      PROPERTIES

      COMPILE_DEFINITIONS "GTEST_CREATE_SHARED_LIBRARY=1")

  endif()

  if (CMAKE_USE_PTHREADS_INIT)

    target_link_libraries(${name} ${CMAKE_THREAD_LIBS_INIT})

  endif()

endfunction()

########################################################################

#

# Helper functions for creating build targets.

function(cxx_shared_library name cxx_flags)

  cxx_library_with_type(${name} SHARED "${cxx_flags}" ${ARGN})

endfunction()

function(cxx_library name cxx_flags)

  cxx_library_with_type(${name} "" "${cxx_flags}" ${ARGN})

endfunction()

# cxx_executable_with_flags(name cxx_flags libs srcs...)

#

# creates a named C++ executable that depends on the given libraries and

# is built from the given source files with the given compiler flags.

function(cxx_executable_with_flags name cxx_flags libs)

  add_executable(${name} ${ARGN})

  if (cxx_flags)

    set_target_properties(${name}

      PROPERTIES

      COMPILE_FLAGS "${cxx_flags}")

  endif()

  if (BUILD_SHARED_LIBS)

    set_target_properties(${name}

      PROPERTIES

      COMPILE_DEFINITIONS "GTEST_LINKED_AS_SHARED_LIBRARY=1")

  endif()

  # To support mixing linking in static and dynamic libraries, link each

  # library in with an extra call to target_link_libraries.

  foreach (lib "${libs}")

    target_link_libraries(${name} ${lib})

  endforeach()

endfunction()

# cxx_executable(name dir lib srcs...)

#

# creates a named target that depends on the given libs and is built

# from the given source files.  dir/name.cc is implicitly included in

# the source file list.

function(cxx_executable name dir libs)

  cxx_executable_with_flags(

    ${name} "${cxx_default}" "${libs}" "${dir}/${name}.cc" ${ARGN})

endfunction()

# Sets PYTHONINTERP_FOUND and PYTHON_EXECUTABLE.

find_package(PythonInterp)

# cxx_test_with_flags(name cxx_flags libs srcs...)

#

# creates a named C++ test that depends on the given libs and is built

# from the given source files with the given compiler flags.

function(cxx_test_with_flags name cxx_flags libs)

  cxx_executable_with_flags(${name} "${cxx_flags}" "${libs}" ${ARGN})

  add_test(${name} ${name})

endfunction()

# cxx_test(name libs srcs...)

#

# creates a named test target that depends on the given libs and is

# built from the given source files.  Unlike cxx_test_with_flags,

# test/name.cc is already implicitly included in the source file list.

function(cxx_test name libs)

  cxx_test_with_flags("${name}" "${cxx_default}" "${libs}"

    "test/${name}.cc" ${ARGN})

endfunction()

# py_test(name)

#

# creates a Python test with the given name whose main module is in

# test/name.py.  It does nothing if Python is not installed.

function(py_test name)

  # We are not supporting Python tests on Linux yet as they consider

  # all Linux environments to be google3 and try to use google3 features.

  if (PYTHONINTERP_FOUND)

    # ${CMAKE_BINARY_DIR} is known at configuration time, so we can

    # directly bind it from cmake. ${CTEST_CONFIGURATION_TYPE} is known

    # only at ctest runtime (by calling ctest -c <Configuration>), so

    # we have to escape $ to delay variable substitution here.

    if (${CMAKE_MAJOR_VERSION}.${CMAKE_MINOR_VERSION} GREATER 3.1)

      add_test(

        NAME ${name}

        COMMAND ${PYTHON_EXECUTABLE} ${CMAKE_CURRENT_SOURCE_DIR}/test/${name}.py

            --build_dir=${CMAKE_CURRENT_BINARY_DIR}/$<CONFIGURATION>)

    else (${CMAKE_MAJOR_VERSION}.${CMAKE_MINOR_VERSION} GREATER 3.1)

      add_test(

        ${name}

        ${PYTHON_EXECUTABLE} ${CMAKE_CURRENT_SOURCE_DIR}/test/${name}.py

          --build_dir=${CMAKE_CURRENT_BINARY_DIR}/\${CTEST_CONFIGURATION_TYPE})

    endif (${CMAKE_MAJOR_VERSION}.${CMAKE_MINOR_VERSION} GREATER 3.1)

  endif()

endfunction()