set(GOOGLETEST_PREFIX "${RAWSPEED_BINARY_DIR}/src/external/googletest")

if(NOT EXISTS ${GOOGLETEST_PREFIX}/googletest-paths.cmake OR
   ${RAWSPEED_SOURCE_DIR}/cmake/Modules/GoogleTest.cmake.in IS_NEWER_THAN ${GOOGLETEST_PREFIX}/googletest-paths.cmake)
  # Download and unpack googletest at configure time
  configure_file(${RAWSPEED_SOURCE_DIR}/cmake/Modules/GoogleTest.cmake.in ${GOOGLETEST_PREFIX}/CMakeLists.txt @ONLY)

  execute_process(COMMAND ${CMAKE_COMMAND} -G "${CMAKE_GENERATOR}"
    -DALLOW_DOWNLOADING_GOOGLETEST=${ALLOW_DOWNLOADING_GOOGLETEST} -DGOOGLETEST_PATH:PATH=${GOOGLETEST_PATH} .
    RESULT_VARIABLE result
    WORKING_DIRECTORY ${GOOGLETEST_PREFIX}
  )

  if(result)
    message(FATAL_ERROR "CMake step for googletest failed: ${result}")
  endif()

  execute_process(
    COMMAND ${CMAKE_COMMAND} --build .
    RESULT_VARIABLE result
    WORKING_DIRECTORY ${GOOGLETEST_PREFIX}
  )

  if(result)
    message(FATAL_ERROR "Build step for googletest failed: ${result}")
  endif()
endif()

# shared googletest exibits various spurious failures.
# let's insist on static library.
set(BUILD_SHARED_LIBS OFF CACHE BOOL "" FORCE)

# Prevent overriding the parent project's compiler/linker
# settings on Windows
set(gtest_force_shared_crt ON CACHE BOOL "" FORCE)

if(NOT (UNIX OR APPLE))
  set(gtest_disable_pthreads ON CACHE BOOL "" FORCE)
endif()

set(CMAKE_C_FLAGS_SAVE "${CMAKE_C_FLAGS}")
set(CMAKE_CXX_FLAGS_SAVE "${CMAKE_CXX_FLAGS}")

set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -w")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -w")

set(CMAKE_CXX_CLANG_TIDY_SAVE "${CMAKE_CXX_CLANG_TIDY}")
set(CMAKE_CXX_INCLUDE_WHAT_YOU_USE_SAVE "${CMAKE_CXX_INCLUDE_WHAT_YOU_USE}")

unset(CMAKE_CXX_CLANG_TIDY)
unset(CMAKE_CXX_INCLUDE_WHAT_YOU_USE)

include(${GOOGLETEST_PREFIX}/googletest-paths.cmake)

# Add googletest directly to our build. This defines
# the gtest and gtest_main targets.
add_subdirectory(${GOOGLETEST_SOURCE_DIR}
                 ${GOOGLETEST_BINARY_DIR}
                 EXCLUDE_FROM_ALL)

set_target_properties(gtest PROPERTIES INTERFACE_SYSTEM_INCLUDE_DIRECTORIES $<TARGET_PROPERTY:gtest,INTERFACE_INCLUDE_DIRECTORIES>)
set_target_properties(gtest_main PROPERTIES INTERFACE_SYSTEM_INCLUDE_DIRECTORIES $<TARGET_PROPERTY:gtest_main,INTERFACE_INCLUDE_DIRECTORIES>)
set_target_properties(gmock PROPERTIES INTERFACE_SYSTEM_INCLUDE_DIRECTORIES $<TARGET_PROPERTY:gmock,INTERFACE_INCLUDE_DIRECTORIES>)
set_target_properties(gmock_main PROPERTIES INTERFACE_SYSTEM_INCLUDE_DIRECTORIES $<TARGET_PROPERTY:gmock_main,INTERFACE_INCLUDE_DIRECTORIES>)

foreach(target gtest gtest_main gmock gmock_main)
  target_compile_definitions(${target} PUBLIC -DGTEST_REMOVE_LEGACY_TEST_CASEAPI_)
endforeach()

set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS_SAVE}")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS_SAVE}")

set(CMAKE_CXX_CLANG_TIDY "${CMAKE_CXX_CLANG_TIDY_SAVE}")
set(CMAKE_CXX_INCLUDE_WHAT_YOU_USE "${CMAKE_CXX_INCLUDE_WHAT_YOU_USE_SAVE}")