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This bug was fixed in the package x11-apps - 7.7+5+nmu1ubuntu1

---------------
x11-apps (7.7+5+nmu1ubuntu1) xenial; urgency=medium

  * Build using -O2 on ppc64el; working around a -Werror=array-bounds build
    error. LP: #1544053.

 -- Matthias Klose <doko@xxxxxxxxxx>  Wed, 10 Feb 2016 14:31:09 +0100

** Changed in: x11-apps (Ubuntu)
       Status: Confirmed => Fix Released

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https://bugs.launchpad.net/bugs/1544053

Title:
  x11-apps fails to build on ppc64el when built with -O3

Status in x11-apps package in Ubuntu:
  Fix Released

Bug description:
  x11-apps fails to build on ppc64el when built with -O3. can be worked
  around with -O2

  see
  https://launchpad.net/ubuntu/+source/x11-apps/7.7+5+nmu1/+build/8913431

  ../xedit/lisp/re/re.c: In function 'rec_build_pat':
  ../xedit/lisp/re/re.c:2328:17: error: array subscript is above array bounds [-Werror=array-bounds]
        if (inf->sp[i]) {
                   ^
  ../xedit/lisp/re/re.c:2329:21: error: array subscript is above array bounds [-Werror=array-bounds]
     distance = inf->sj[i] - inf->sr[i];
                       ^
  ../xedit/lisp/re/re.c:2329:34: error: array subscript is above array bounds [-Werror=array-bounds]
     distance = inf->sj[i] - inf->sr[i];
                                    ^
  ../xedit/lisp/re/re.c:2331:19: error: array subscript is above array bounds [-Werror=array-bounds]
     inf->cod[inf->sr[i] + 4] = (distance & 0xff00) >> 8;
                     ^

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