Help: Clarify file(COPY) directory semantics (#15561)
State explicitly that directory structure is preserved.
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@ -313,8 +313,12 @@ preserves input file timestamps, and optimizes out a file if it exists
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at the destination with the same timestamp. Copying preserves input
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permissions unless explicit permissions or ``NO_SOURCE_PERMISSIONS``
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are given (default is ``USE_SOURCE_PERMISSIONS``).
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See the :command:`install(DIRECTORY)` command for documentation of
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permissions, ``PATTERN``, ``REGEX``, and ``EXCLUDE`` options.
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permissions, ``FILES_MATCHING``, ``PATTERN``, ``REGEX``, and
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``EXCLUDE`` options. Copying directories preserves the structure
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of their content even if options are used to select a subset of
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files.
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The ``INSTALL`` signature differs slightly from ``COPY``: it prints
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status messages (subject to the :variable:`CMAKE_INSTALL_MESSAGE` variable),
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