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1.58. gcc
1.58.1. RHBA-2009:1533: bug fix update
Note
This update has already been released (prior to the GA of this release) as errata RHBA-2009:1533
The gcc packages include C, C++, Java, Fortran, Objective C, and Ada 95 GNU compilers, along with related support libraries.
This update fixes the following bug:
* if multiple "-fno-builtin-*" options were specified on the command line (for example, "-fno-builtin-iswalpha -fno-builtin-iswalnum") only the last option was honored (in the example, -fno-builtin-iswalnum). With this update, joined switches are no longer pruned, ensuring all such options are honored, as expected. (BZ#526421)
Users are advised to install this gcc update, which applies this fix.
1.58.2. RHSA-2010:0039: Moderate and gcc4 security update
Important
This update has already been released (prior to the GA of this release) as the security errata RHSA-2010:0039
This update has been rated as having moderate security impact by the Red Hat Security Response Team.
The gcc and gcc4 packages include, among others, C, C++, and Java GNU compilers and related support libraries. libgcj contains a copy of GNU Libtool's libltdl library.
A flaw was found in the way GNU Libtool's libltdl library looked for libraries to load. It was possible for libltdl to load a malicious library from the current working directory. In certain configurations, if a local attacker is able to trick a local user into running a Java application (which uses a function to load native libraries, such as System.loadLibrary) from within an attacker-controlled directory containing a malicious library or module, the attacker could possibly execute arbitrary code with the privileges of the user running the Java application. (CVE-2009-3736)
All gcc and gcc4 users should upgrade to these updated packages, which contain a backported patch to correct this issue. All running Java applications using libgcj must be restarted for this update to take effect.
1.58.3. RHBA-2010:0232: bug fix update
A gcc update that resolves several compiler bugs is now available.
The gcc packages include C, C++, Java, Fortran, Objective C, and Ada 95 GNU compilers, along with related support libraries.
This update applies the following bug fixes:
* when compiling a debug version of a C++ program, it was possible for gcc to lose debug information for some local variables in C++ constructors or destructors. This was because gcc incorrectly released information on abstract functions (specifically, contents of the DECL_INITIAL() function), which are needed for creating debug information. With this release, nodes containing abstract functions are flagged accordingly to prevent gcc from prematurely discarding needed debug information. (BZ#513184)
* when issuing multiple -fno-builtin-* switches to gcc, gcc only registered the last switch. With this release, gcc can now register multiple -fno-builtin-* switches correctly. (BZ#515799)
* in some cases, aggregates returned by value could cause reload failures in the caller function, resulting in an internal compiler error. This was caused by a bug in the combining code that incorrectly lengthens the lifetime of a hard register. This update applies a patch to expand_call function in gcc/calls.c that resolves the issue. (BZ#516028)
* using g++ to compile code containing virtual inheritances could result in a segmentation fault. This was because the dynamic_cast code in gcc did not use src2dst hints as expected; as a result, g++ could search an unnecessarily large address list for possible bases. With this release, the dynamic_cast code now uses src2dst hints; this allows g++ to defer searching bases that don't overlap with a virtual inheritance's address. (BZ#519519)
* On PowerPC, it was possible for DWARF access to function parameters to fail. This was caused by a bug in the GCC instruction set for PowerPC, where compiling with -mno-sched-prolog could discard debug location lists. This update fixes the bug, ensuring consistent DWARF access to function parameters on PowerPC. (BZ#528792)
* The libgcc undwinder now supports DW_OP_swap handling. This update also fixes bugs in the way unwinding code handled unwind information from DW_OP_{gt,ge,lt,le} and DW_CFA_{remember,restore}_state. (BZ#555731)
All GCC users are advised to install this update.