gdb 6.5 on Solaris x86 can't debug programs from g++ 4.2.0

I have gdb 6.5 on Solaris-for-x86, and I find that I can't run programs 
compiled with g++4.2.0. When I run these programs under GDB, the debugee 
dumps core.

Furthermore, when I try to use gdb to read the core file generated by the 
first crash, gdb dumps core.

In addition, the "dbx" command supplied by Sun in SunStudio 12 for 
Solaris-on-x86 also crashes when debugging a program compiled by g++ 
4.2.0.

When I dump the uninstrumented 
/usr/p/tools/sunos5_x86/install/gcc/4.2.0/lib/amd64/libstc++.so.6 using 
dwarfdump -l I get this error message:
    dwarfdump ERROR: dwarf_linesrc: DW_DLE_LINE_FILE_NUM_BAD (61)

I downloaded and built gdb 6.6 and it does not crash when running a C++ 
program built with g++ 4.2.0. 

It doesn't seem reasonable that I have to get the absolute newest release 
in order to debug successfully. Also, it is unfriendly of g++ to be 
incompatible with the vendor's debugger on a current, supported platform.

Is this interesting? Where do I report a bug/crash like this so it gets 
the right people's attention? Thanks.

-- Allan Pratt, [email protected]
Rational software division of IBM