Re: patch for 64 bit IRIX support

[Stan Shebs <shebs@cygnus.com>]

   From: Benjamin Gamsa <ben@sys.toronto.edu>
   Date: Wed, 3 Mar 1999 23:21:00 -0500

   I've included below a patch to gdb-4.17.85 to support the IRIX 64-bit
   ABI.  I've tried to keep the changes in line with the general structure
   of gdb, but it still contains a few hacks.  In particular, I'm not sure
   about the configure stuff; such as how to specify that I want to build
   for 64bit SGI targets rather than the default 32 bit target (for now I
   just default irix6 to a new configuration file irix6-64, rather than the
   previous irix5 that built the 32 bit version; this is clearly wrong).

Thanks for working on this!  You're right, this will need some more
tinkering before it can go into the repository.  Ideally, GDB would be
able to auto-detect whether an executable is 32- or 64-bit and adjust
its computations dynamically; so instead of assuming a particular
format of stack frame, the macros expand into functions that look
at a per-executable variable before jumping into the real code.

If that isn't going to work, perhaps because of old stupid ifdefs in
GDB that wire it to a particular size, then you will need to have a
separate config.  I would suggest a name like mips-sgi-irix6n64, with
mips-sgi-irix6 falling back to the old 32-bit version.

  Although I've done some simple preliminary testing to verify that it
   can at least step through 64 bit programs and read variables, more
   testing is clearly needed.

You can give your port a pretty good workout by using the GDB testsuite.
All the DejaGNU bits needed are on the ftp site, just build/install
it, go to gdb/testsuite in the objdir, and do "make check".

								Stan