RHBA-2011:0102 - Bug Fix Advisory

Topic

Updated gcc44 packages that fix several bugs are now available.

Description

The gcc44 packages provide the GNU Compiler Collection (GCC), which includes GNU
compilers and related support libraries for C, C++, and Fortran programming
languages. These packages also include libgomp, the GNU implementation of the
OpenMP Application Programming Interface for multi-platform shared-memory
parallel programming.

These updated gcc44 packages provide fixes for the following bugs:

• Prior to this update, irregularities in the debuginfo package prevented the

user from seeing local variables in a debugger. This was caused by overlapping
entries in the '.debug_ranges' variable. This update fixes the aforementioned
issue so that using a debbuger now works as expected. (BZ#510958)

• Under certain circumstances, compiling a program with g++ caused a

segmentation fault. This was caused by a flaw in the 'dynamic_cast' code. With
this update, the aforementioned fault has been fixed and the crash no longer
occurs. (BZ#519517)

• A common block thread private variable was out of scope inside the OpenMP

parallel region. Since the variable was thread private, it should have pointed
to different addresses in each of the different threads in the common block,
but, failed to do so. The variable also exposed a different error where the
address of the variable could not be found by gdb. This update fixes the
aforementioned flaws. (BZ#533183)

• Under certain circumstances, compiling with the "g++44 -m32 -O2" command on

Red Hat Enterprise Linux 5.4 resulted in the following error:

internal compiler error: in emit_swap_insn, at reg-stack.c:827

This update fixes the issue above, and compilation now works as expected.
(BZ#548384)

• Compiling certain programs with the '-O2' option resulted in the following

error:

error: unable to find a register to spill in class

This error is no longer returned with this update, and the operation now
completes as expected. (BZ#558549)

• Passing a variable reference of type 'const' to a function caused the compiler

to crash and return an error. This update fixes the flaw in the code so that
passing variable references now works as expected. (BZ#593060)

• A certain test case did not compile due to the xor instructions in the code

being optimized out. With this update, the aforementioned issue has been fixed
and no longer occurs. (BZ#593117)

Users are advised to upgrade to these updated gcc44 packages, which resolve
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 5 x86_64
• Red Hat Enterprise Linux Server 5 ia64
• Red Hat Enterprise Linux Server 5 i386
• Red Hat Enterprise Linux Workstation 5 x86_64
• Red Hat Enterprise Linux Workstation 5 i386
• Red Hat Enterprise Linux Desktop 5 x86_64
• Red Hat Enterprise Linux Desktop 5 i386
• Red Hat Enterprise Linux for IBM z Systems 5 s390x
• Red Hat Enterprise Linux for Power, big endian 5 ppc
• Red Hat Enterprise Linux Server from RHUI 5 x86_64
• Red Hat Enterprise Linux Server from RHUI 5 i386

Fixes

• BZ - 510958 - Overlapping .debug_ranges (C++)
• BZ - 519517 - [RHEL5 gcc44-c++] Code with virtual inheritance compiled by g++ crash at run-time
• BZ - 533183 - common block thread private variables out of scope inside OpenMP parallel region
• BZ - 548384 - [RHEL5] g++44 -m32 -O2 ICE in emit_swap_insn, at reg-stack.c:827
• BZ - 558549 - [RHEL5][GCC] UNABLE TO FIND A REGISTER TO SPILL IN CLASS `AREG'
• BZ - 593060 - gcc 4.1.2, 4.3.2, 4.4 bug: passing const-reference-to-function
• BZ - 593117 - gcc44 -O issue Xor instructions optimized out.

CVEs

(none)

References

(none)