Tests/RunCMake/XcodeProject/XcodeGenerateTopLevelProjectOnly-check.cmake - third_party/github.com/Kitware/CMake - Git at Google

 if(EXISTS "${RunCMake_TEST_BINARY_DIR}/subproject/subproject.xcodeproj")
   message(SEND_ERROR "Unexpected project file for subproject found.")
 endif()
	if(EXISTS "${RunCMake_TEST_BINARY_DIR}/subproject/subproject.xcodeproj")
	message(SEND_ERROR "Unexpected project file for subproject found.")
	endif()