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13 lines
520 B
13 lines
520 B
3 years ago
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set(oldname "${CMAKE_CURRENT_BINARY_DIR}/input")
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set(newname "${CMAKE_CURRENT_BINARY_DIR}/output")
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file(WRITE "${oldname}" "")
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execute_process(COMMAND "${CMAKE_COMMAND} -E sleep 1")
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file(WRITE "${newname}" "")
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file(TIMESTAMP "${newname}" before_copy UTC)
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file(COPY_FILE "${oldname}" "${newname}" RESULT result ONLY_IF_DIFFERENT)
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file(TIMESTAMP "${newname}" after_copy UTC)
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if (NOT before_copy STREQUAL after_copy)
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message(FATAL_ERROR
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"${newname} was modified even though ONLY_IF_DIFFERENT was specified")
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endif ()
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