RHBA-2011:0663 - Bug Fix Advisory

Topic

A gcc update that resolves several compiler bugs is now available.

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 applies the following bug fixes:

• These updated packages provide support for the "-mcmodel=medium" and

"-mcmodel=large" options on the 64-bit PowerPC architecture. These new options
provide the ability to extend the TOC addressing space up to 2GB. (BZ#630166)

• gcc now has the ability to emit pre-fetch instructions for "memcmp", "memcpy"

and "memset" in-line expansions when optimizing for IBM System z10 CPUs.
(BZ#632366)

• Previously, leaf functions that accessed TLS variables in the global or local

dynamic model were not generating a large enough stack frame on PowerPC 64-bit.
In this updated package, the generated stack frame is now larger than 112 bytes,
resolving this issue. (BZ#624889)

• Previously a regression in the gfortran compiler was causing the "-M" option

to not be recognized. In these updated packages the "-M" option is now
recognized and functions as expected. (BZ#675132)

• Previously, the optimizations performed when calculating induction variables

during the induction variable optimization (ivopts) pass were not as efficient
as previous releases. In these updated packages, the optimizations performed
during the the induction variable optimization (ivopts) pass is improved.
(BZ#592502)

• Previously, if a Java application built with gcj attempted to submit a print

job to a print queue that was disabled, the process would enter a busy loop.
This update fixes this issue by first checking if the print queue is null before
attempting to send it a print job. (BZ#618258)

• Previously, using "always_inline" on a function when compiling with "-g"

without any "-O" options would cause the compiler to insert debugging
annotations in unexpected locations. Consequently, the unexpected annotations
caused the compiler to crash with an internal error. In these updated packages,
the compiler is modified to properly handle attributes which change optimization
levels, such as always_inline, properly. (BZ#659582)

• This update provides code optimizations for the IBM System z architecture.

(BZ#632370)

• The mask operand for the AVX mask load/store is fixed. (BZ#635015)

All users of gcc are advised to upgrade to these updated packages which address
these issues.

Solution

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

This update is available via Red Hat Network. Details on how to use the Red
Hat Network to apply this update are available at
https://access.redhat.com/kb/docs/DOC-11259

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 Server - Extended Life Cycle Support 6 i386
• 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 (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 - 592502 - Performance regression 15% for single precision linpack benchmark
• BZ - 618258 - Printing from java fails when job-state-reasons contains printer-stopped
• BZ - 630166 - [6.1 FEAT] Large-TOC support
• BZ - 632366 - [6.1 FEAT] Exploitation of z10 prefetching instructions
• BZ - 632370 - [6.1 FEAT] System z optimizations for gcc 2009
• BZ - 655707 - Backport safe fixes from branches/gcc-4_4-branch and branches/redhat/gcc-4_4-branch
• BZ - 659582 - gcc: internal compiler error: in get_insn_template, at final.c:1726
• BZ - 675132 - -M option not available in gcc-gfortran-4.4

CVEs

(none)

References

(none)