[Bug 1330099] [NEW] gfortran 4.8.2-19ubuntu1 miscompiles CASTEP

[Miguel Martinez]

Public bug reported:

The current gfortran-4.8 package in Trusty (4.8.2-19ubuntu1 as of today)
miscompiles CASTEP to a useless state, regardless of compile flags. Even
-O0 will result in a useless binary. The main problem is the binary
misreads values stored in between blocks, such as

%block lattice_cart
2.6954645 2.6954645 0.0 
2.6954645 0.0 2.6954645
0.0 2.6954645 2.6954645
%endblock lattice_cart

This regression is apparently caused by a patch in GCC 4.9 backported
into Debian/Ubuntu. It certainly does not affect Macports' gfortran
4.8.2, nor in the gfortran 4.8.x compilation at archer.ac.uk. I'll try
to find out if a gcc regression has been filed about this, and post it
later, so it is easier to revert the patch or otherwise fix the issue.

In any case, CASTEP is proprietary source code, and won't be able to
share the source in order to further diagnose the issue.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: gfortran 4:4.8.2-1ubuntu6
ProcVersionSignature: Ubuntu 3.13.0-29.53-generic 3.13.11.2
Uname: Linux 3.13.0-29-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.2
Architecture: amd64
CurrentDesktop: GNOME
Date: Sat Jun 14 17:29:19 2014
InstallationDate: Installed on 2011-12-21 (906 days ago)
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
SourcePackage: gcc-defaults
UpgradeStatus: Upgraded to trusty on 2014-04-17 (58 days ago)

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


** Tags: amd64 apport-bug trusty

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https://bugs.launchpad.net/bugs/1330099

Title:
  gfortran 4.8.2-19ubuntu1 miscompiles CASTEP

Status in “gcc-defaults” package in Ubuntu:
  New

Bug description:
  The current gfortran-4.8 package in Trusty (4.8.2-19ubuntu1 as of
  today) miscompiles CASTEP to a useless state, regardless of compile
  flags. Even -O0 will result in a useless binary. The main problem is
  the binary misreads values stored in between blocks, such as

  %block lattice_cart
  2.6954645 2.6954645 0.0 
  2.6954645 0.0 2.6954645
  0.0 2.6954645 2.6954645
  %endblock lattice_cart

  This regression is apparently caused by a patch in GCC 4.9 backported
  into Debian/Ubuntu. It certainly does not affect Macports' gfortran
  4.8.2, nor in the gfortran 4.8.x compilation at archer.ac.uk. I'll try
  to find out if a gcc regression has been filed about this, and post it
  later, so it is easier to revert the patch or otherwise fix the issue.

  In any case, CASTEP is proprietary source code, and won't be able to
  share the source in order to further diagnose the issue.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: gfortran 4:4.8.2-1ubuntu6
  ProcVersionSignature: Ubuntu 3.13.0-29.53-generic 3.13.11.2
  Uname: Linux 3.13.0-29-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.2
  Architecture: amd64
  CurrentDesktop: GNOME
  Date: Sat Jun 14 17:29:19 2014
  InstallationDate: Installed on 2011-12-21 (906 days ago)
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
  SourcePackage: gcc-defaults
  UpgradeStatus: Upgraded to trusty on 2014-04-17 (58 days ago)

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