GDB on SGI Irix 6.5

[Eli Zaretskii <eliz@is.elta.co.il>]

Did someone successfully build the current CVS version on Irix 6.5?  If 
so, are there any special tricks one need to be aware of to do that?

I built GDB with "./configure; make" with the native C compiler and a 
native Make.  While it built okay, the resulting binary aborts at runtime 
like this:

  (src)gdb ./emacs
  GNU gdb 20010402
  Copyright 2001 Free Software Foundation, Inc.
  GDB is free software, covered by the GNU General Public License, and you are
  welcome to change it and/or distribute copies of it under certain  conditions.
  Type "show copying" to see the conditions.
  There is absolutely no warranty for GDB.  Type "show warranty" for details.
  This GDB was configured as "mips-sgi-irix6.5"...
  Environment variable "DISPLAY" not defined.
  TERM = vt220
  Breakpoint 1 at 0x100ff7d0: file emacs.c, line 384.
  Breakpoint 2 at 0x100d8e18: file xterm.c, line 11714.
  (gdb) b main
  Breakpoint 3 at 0x100ffe48: file emacs.c, line 736.
  (gdb) r -q
  Starting program: /gnu/emacs-21/emacs-21.0.101/src/./emacs -q
  regcache.c:282: gdb-internal-error: Assertion `regnum >= 0 && regnum < (NUM_REGS + NUM_PSEUDO_REGS)' failed.
  An internal GDB error was detected.  This may make further
  debugging unreliable.  Continue this debugging session? (y or n)

I've verified that this happens because legacy_read_register_gen is 
called with regnum = 72, while it doesn't expect any register to have a 
number greater than 71.

Any clues?