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add_custom_command(
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OUTPUT gen-byproduct gen-byproduct-stamp
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BYPRODUCTS byproduct
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COMMAND ${CMAKE_COMMAND} -E touch gen-byproduct-stamp
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COMMAND ${CMAKE_COMMAND} -E copy_if_different gen-byproduct-stamp byproduct
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)
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set_property(SOURCE gen-byproduct PROPERTY SYMBOLIC 1)
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add_custom_target(produce DEPENDS gen-byproduct)
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add_custom_command(
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OUTPUT use-byproduct
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DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/byproduct
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COMMAND ${CMAKE_COMMAND} -E sleep 1.125 # workaround buggy filesystem timestamps
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COMMAND ${CMAKE_COMMAND} -E touch use-byproduct
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)
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add_custom_target(drive ALL DEPENDS use-byproduct)
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add_dependencies(drive produce)
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file(GENERATE OUTPUT check-$<LOWER_CASE:$<CONFIG>>.cmake CONTENT "
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if (check_step EQUAL 1)
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set(check_pairs
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\"${CMAKE_CURRENT_BINARY_DIR}/use-byproduct|${CMAKE_CURRENT_BINARY_DIR}/gen-byproduct-stamp\"
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)
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else()
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set(check_pairs
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\"${CMAKE_CURRENT_BINARY_DIR}/gen-byproduct-stamp|${CMAKE_CURRENT_BINARY_DIR}/use-byproduct\"
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)
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endif()
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")
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