RHBA-2012:0941 - Bug Fix Advisory

Topic

Updated gcc packages that fix various bugs and add one enhancement are now
available for Red Hat Enterprise Linux 6.

Description

The gcc packages include C, C++, Java, Fortran, Objective C, Objective C++, and
Ada 95 GNU compilers, along with related support libraries.

This update fixes the following bugs:

• The gfortran compiler could fail to compile the code with an internal compiler

error. This happened because the gfc_type_for_size() function from the
trans-types.c library did not return the correct data type if the demanded bit
precision was less than the built-in bit precision size of the corresponding
type. With this update, the function returns the corresponding wider type if no
suitable narrower type has been found and the code is compiled correctly.
(BZ#751767)

• The G++ compiler terminated unexpectedly with a segmentation fault and

returned an internal compiler error when compiling with the -O2 or -O3
optimization option. This happened because the compiler tried to cancel the same
loop twice in the remove_path() function. With this update, the loop is canceled
only once and the segmentation fault no longer occurs in this scenario.
(BZ#756138)

• Previously, GCC could generate incorrect code if combining instructions when

splitting a two-set pattern. This was due to an error in the way the split
patterns were handled while combining the instructions. With this update, the
code handling instruction combining has been fixed and the problem no longer
occurs. (BZ#756651)

• Previously, GCC could terminate unexpectedly with an internal compiler error,

which was triggered by aggressive loop peeling enabled by the "-mtune=z10"
setting when moving registers. With this update, the registers are determined
from the instruction patterns correctly and the compilation succeeds in this
scenario. (BZ#767604)

• Typing into Web Console in Firefox caused Firefox to terminate unexpectedly.

This happened because the compiler incorrectly cloned one of the functions
called under these circumstances. With this update, the function is no longer
cloned and the problem no longer occurs. (BZ#799491)

In addition, this update adds the following enhancement:

• Previously, the GCC compiler did not contain the header with functions for

converting the half-float type. This update adds the header and also fixes GCC
so that it works correctly with the "-march=native" option on AMD FX processor
microarchitectures. (BZ#739443)

All users of gcc are advised to upgrade to these updated packages, which fix
these bugs and add this enhancement.

Solution

Before applying this update, make sure all previously-released errata
relevant to your system have been applied.

This update is available via the Red Hat Network. Details on how to
use the Red Hat Network to apply this update are available at
https://access.redhat.com/knowledge/articles/11258

Affected Products

• Red Hat Enterprise Linux Server 6 x86_64
• Red Hat Enterprise Linux Server 6 i386
• Red Hat Enterprise Linux Server - Extended Life Cycle Support 6 x86_64
• Red Hat Enterprise Linux Workstation 6 x86_64
• Red Hat Enterprise Linux Workstation 6 i386
• Red Hat Enterprise Linux Desktop 6 x86_64
• Red Hat Enterprise Linux Desktop 6 i386
• Red Hat Enterprise Linux for IBM z Systems 6 s390x
• Red Hat Enterprise Linux for Power, big endian 6 ppc64
• Red Hat Enterprise Linux for Scientific Computing 6 x86_64
• Red Hat Enterprise Linux Server from RHUI 6 x86_64
• Red Hat Enterprise Linux Server from RHUI 6 i386
• Red Hat Enterprise Linux Server - Extended Life Cycle Support 6 i386
• Red Hat Enterprise Linux Server - Extended Life Cycle Support (for IBM z Systems) 6 s390x
• Red Hat Enterprise Linux Server - Extended Life Cycle Support Extension 6 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support Extension 6 i386
• Red Hat Enterprise Linux Server - Extended Life Cycle Support Extension (for IBM z Systems) 6 s390x

Fixes

• BZ - 729042 - Debuginfo package issues in gcc
• BZ - 751767 - gfortran fails to compile stbt05.f (lapack 3.1) with -O2
• BZ - 756138 - g++ internal compiler error compiling Rosetta 3.3 (-O2/-O3, fine with -O0/-O1)
• BZ - 799491 - Typing into Web Console in Firefox causes crashing - gcc 4.4.3

CVEs

(none)

References

(none)