# the following code to fetch googletest
# is inspired by and adapted after https://crascit.com/2015/07/25/cmake-gtest/
# download and unpack googletest at configure time

macro(fetch_googletest _download_module_path _download_root)
	set(GOOGLETEST_DOWNLOAD_ROOT ${_download_root})
	configure_file(
		${_download_module_path}/googletest-download.cmake
		${_download_root}/CMakeLists.txt
		@ONLY
		)
	unset(GOOGLETEST_DOWNLOAD_ROOT)

	execute_process(
		COMMAND
			"${CMAKE_COMMAND}" -G "${CMAKE_GENERATOR}" .
		WORKING_DIRECTORY
			${_download_root}
		)
	execute_process(
		COMMAND
			"${CMAKE_COMMAND}" --build .
		WORKING_DIRECTORY
			${_download_root}
		)

	# adds the targers: gtest, gtest_main, gmock, gmock_main
	add_subdirectory(
		${_download_root}/googletest-src
		${_download_root}/googletest-build
		)
endmacro()