[Bug 264839] ObsoleteFiles.inc miss few things

From: <bugzilla-noreply_at_freebsd.org>
Date: Thu, 23 Jun 2022 17:56:00 UTC

--- Comment #1 from John Baldwin <jhb@FreeBSD.org> ---
The third category is because install will not overwrite an existing file if
the contents are identical.  The reason is to avoid causing unnecessary
rebuilds (e.g. if we bumped the mtime on all headers in /usr/include on each
install world, then every subsequent make has to rebuild everything even when
it isn't needed).

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