[Bug 207712] FreeBSD buildworld fails if option WITHOUT_SYMVER is set

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=207712

--- Comment #2 from commit-hook at freebsd.org ---
A commit references this bug:

Author: emaste
Date: Tue Mar  8 00:09:34 UTC 2016
New revision: 296474
URL: https://svnweb.freebsd.org/changeset/base/296474

Log:
  libc/{i386,amd64}: Do not export .cerror when building WITHOUT_SYMVER

  Further to r240152 (i386) and r240178 (amd64), hide the .cerror symbol
  so that it is not exported if symbol versioning is not in use.  Without
  this change WITHOUT_SYMVER libc contains .text relocations for .cerror,
  as described in LLVM PR 26813 (http://llvm.org/pr26813).

  This is a no-op for the regular build as the symbol version script
  already controls .cerror visibility.

  PR:           207712
  Submitted by: Rafael Esp?ndola
  Reviewed by:  jilles, kib
  Differential Revision:        https://reviews.freebsd.org/D5571

Changes:
  head/lib/libc/amd64/sys/cerror.S
  head/lib/libc/i386/sys/cerror.S

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