DownloadGTest.cmake

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# Integrates googletest at configure time.  Based on the instructions at

# https://github.com/google/googletest/tree/master/googletest#incorporating-into-an-existing-cmake-project

# Set up the external googletest project, downloading the latest from Github

# master if requested.

configure_file(

  ${CMAKE_CURRENT_LIST_DIR}/CMakeLists.txt.in

  ${CMAKE_BINARY_DIR}/googletest-external/CMakeLists.txt

set(ABSL_SAVE_CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS})

set(ABSL_SAVE_CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_RUNTIME_OUTPUT_DIRECTORY})

if (BUILD_SHARED_LIBS)

  set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)

  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DGTEST_CREATE_SHARED_LIBRARY=1")

endif()

# Configure and build the googletest source.

execute_process(COMMAND ${CMAKE_COMMAND} -G "${CMAKE_GENERATOR}" .

  RESULT_VARIABLE result

  WORKING_DIRECTORY ${CMAKE_BINARY_DIR}/googletest-external )

if(result)

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

endif()

execute_process(COMMAND ${CMAKE_COMMAND} --build .

  RESULT_VARIABLE result

  WORKING_DIRECTORY ${CMAKE_BINARY_DIR}/googletest-external)

if(result)

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

endif()

set(CMAKE_CXX_FLAGS ${ABSL_SAVE_CMAKE_CXX_FLAGS})

set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${ABSL_SAVE_CMAKE_RUNTIME_OUTPUT_DIRECTORY})

# Prevent overriding the parent project's compiler/linker settings on Windows

set(gtest_force_shared_crt ON CACHE BOOL "" FORCE)

# Add googletest directly to our build. This defines the gtest and gtest_main

# targets.

add_subdirectory(${absl_gtest_src_dir} ${absl_gtest_build_dir} EXCLUDE_FROM_ALL)