mesh-periodic…

gtest.cmake
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			set(_working_dir ${PROJECT_BINARY_DIR}/third-party/src/gtest-download)

			configure_file(${PROJECT_SOURCE_DIR}/third-party/gtest.cmake.in ${_working_dir}/CMakeLists.txt)

			set(GTEST_ROOT ${PROJECT_BINARY_DIR}/third-party)
			find_package(GTest QUIET)

			if(NOT GTEST_FOUND)
			if(NOT EXISTS ${PROJECT_SOURCE_DIR}/third-party/google-test)
			message(STATUS "Downloading googletest")
			execute_process(COMMAND ${CMAKE_COMMAND} -G "${CMAKE_GENERATOR}" .
			RESULT_VARIABLE result WORKING_DIRECTORY ${_working_dir}
			OUTPUT_FILE ${_working_dir}/configure-out.log
			ERROR_FILE ${_working_dir}/configure-error.log)

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

			execute_process(COMMAND ${CMAKE_COMMAND} --build .
			RESULT_VARIABLE result WORKING_DIRECTORY ${_working_dir}
			OUTPUT_FILE ${_working_dir}/build-out.log
			ERROR_FILE ${_working_dir}/build-error.log)

			if(result)
			message(SEND_ERROR "Downloading googletest failed: ${result}")
			return()
			endif()
			endif()

			set(BUILD_GTEST ON CACHE INTERNAL "" FORCE)
			set(BUILD_GMOCK OFF CACHE INTERNAL "" FORCE)

			add_subdirectory(third-party/google-test)

			add_library(GTest::Main ALIAS gtest_main)
			add_library(GTest::GTest ALIAS gtest)
			set(gtest_FOUND TRUE CACHE INTERNAL "" FORCE)
			set(GTEST_INCLUDE_DIRS third-party/google-test/googletest/include CACHE INTERNAL "" FORCE)
			set(GTEST_LIBRARIES GTest::Main CACHE INTERNAL "" FORCE)
			mask_package_options(gtest)
			endif()