[Bug 1704401] [NEW] Upstream bug/PR 66343: UBSan sometimes generates broken code

[Christian Henz]

Public bug reported:

gcc (Ubuntu 5.4.0-6ubuntu1~16.04.4) 5.4.0 20160609

Ran into this today - under certain circumstances,
"-fsanitize=undefined" generates ambiguous local labels so that the code
cannot be assembled.

This is already fixed upstream, also backported to the gcc-5-branch, but
not released as of today.

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66343

** Affects: gcc-5 (Ubuntu)
     Importance: Undecided
         Status: New

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Title:
  Upstream bug/PR 66343: UBSan sometimes generates broken code

Status in gcc-5 package in Ubuntu:
  New

Bug description:
  gcc (Ubuntu 5.4.0-6ubuntu1~16.04.4) 5.4.0 20160609

  Ran into this today - under certain circumstances,
  "-fsanitize=undefined" generates ambiguous local labels so that the
  code cannot be assembled.

  This is already fixed upstream, also backported to the gcc-5-branch,
  but not released as of today.

  https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66343

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