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if("x${CMAKE_GENERATOR_INSTANCE}" STREQUAL "x")
message(FATAL_ERROR "CMAKE_GENERATOR_INSTANCE is empty but should have a value.")
elseif("x${CMAKE_GENERATOR_INSTANCE}" MATCHES [[\\]])
message(FATAL_ERROR
"CMAKE_GENERATOR_INSTANCE is\n"
" ${CMAKE_GENERATOR_INSTANCE}\n"
"which contains a backslash.")
elseif(NOT IS_DIRECTORY "${CMAKE_GENERATOR_INSTANCE}")
message(FATAL_ERROR
"CMAKE_GENERATOR_INSTANCE is\n"
" ${CMAKE_GENERATOR_INSTANCE}\n"
"which is not an existing directory.")
endif()
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