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`.hidden NAMES'

   This one of the ELF visibility directives.  The other two are
`.internal' (*note `.internal': Internal.) and `.protected' (*note
`.protected': Protected.).

   This directive overrides the named symbols default visibility (which
is set by their binding: local, global or weak).  The directive sets
the visibility to `hidden' which means that the symbols are not visible
to other components.  Such symbols are always considered to be
`protected' as well.