[Bug 228780] Strict aliasing violations in libc / qsort.c

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=228780

--- Comment #3 from commit-hook at freebsd.org ---
A commit references this bug:

Author: kib
Date: Sun Jun 10 17:54:44 UTC 2018
New revision: 334928
URL: https://svnweb.freebsd.org/changeset/base/334928

Log:
  libc qsort(3): stop aliasing.

  Qsort swap code aliases the sorted array elements to ints and longs in
  order to do swap by machine words.  Unfortunately this breaks with the
  full code optimization, e.g. LTO.

  See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83201 which seems to
  reference code directly copied from libc/stdlib/qsort.c.

  PR:   228780
  Reported by:  mliska at suse.cz
  Reviewed by:  brooks
  Sponsored by: The FreeBSD Foundation
  MFC after:    2 weeks
  Differential revision:        https://reviews.freebsd.org/D15714

Changes:
  head/lib/libc/stdlib/qsort.c

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