Hi,

This is part of a series of patches from a CodeSourcery branch which 
enable the output of ARM's RVCT 2.2 compiler to be debugged with gdb.

ARMCC's support for DWARF 3 is superior to its DWARF 2 support, and GDB 
apparently supports much of DWARF 3 already. This patch allows DWARF 3 
format debug info to be accepted by gdb.

(Some things are notably missing from the DWARF 3 support -- one thing 
I've noticed so far is lack of support for DW_TAG_partial_unit, but RVDS 
2.2 doesn't seem to need that. A couple of other minor things will be 
addressed in followup patches.)

Tested with cross to arm-none-eabi, and natively on 
x86_64-unknown-linux-gnu. OK to apply on mainline?

Cheers,

Julian

ChangeLog (Daniel Jacobowitz):

     * gdb/dwarf2read.c (partial_read_comp_unit_head): Accept version 3.