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[Matthias Klose <doko@xxxxxxxxxx>]

please re-check with the gcc-4.8 package in the ubuntu-toolchain-r/ppa
PPA.  This is a backport candidate for trusty.

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https://bugs.launchpad.net/bugs/1395019

Title:
  [4.8/4.9 Regression] Infinite loop generated with >=O2

Status in The GNU Compiler Collection:
  Fix Released
Status in “gcc-4.8” package in Ubuntu:
  New

Bug description:
  After some conditional blocks, it's possible that an infinite loop is
  generated.

  See: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59358

  This problem was fixed back in December 2013 in the 4.8 branch as well
  as the trunk branch.  However, the trusty package ended up without the
  fix.

  This is the patch that is missing:
  https://gcc.gnu.org/viewcvs/gcc/branches/gcc-4_8-branch/gcc/tree-vrp.c?view=patch&r1=205608&r2=205607&pathrev=205608

  This has already affected a separate package, that needed to workaround the problem:
  https://bugs.launchpad.net/ubuntu/+source/krb5/+bug/1347147

  And is now causing issues for users that run into this problem as
  well.

  Please apply the patch to the gcc-4.8 version shipped on trusty and on
  utopic.

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