Re: Debug info for 'complex' types

[Daniel Jacobowitz <drow@mvista.com>]

On Fri, Feb 01, 2002 at 10:34:24AM +0000, George Helffrich +44 117 954 5437 wrote:
> I proposed this change also to fix complex value support in GDB (I use
> g77, gdb and complex arithmetic extensively in my line of work).  My base
> version was GDB 4.16.  (I can send you patches if you are interested.)  After
> studying all stabs documentation I could find (with no particular illumination
> on the issue of complex types), I also compared stabs output from other
> Fortran compilers available to me.  Here they are:
> 
> >From Solaris 2.7 SC4.2 f77:
> 
> 	.stabs  "complex*8:t9=R3;8",32,0,0,0
> 
> >From SunOS 4.1.3 f77:
> 
> 	.stabs  "complex:t7=r7;8;0;",0x20,0,0,0
> 
> and with the patch I proposed for g77 (2.95.2 19991024 release, patched):
> 
> .stabs "complex float:t(0,16)=r(0,16);8;0;",128,0,0,0
> 
> I think this indicates the length should be 8 for a single precision complex
> value.  If you want gdb to even think about supporting Sun Fortran compiler
> stabs (my gdb tries to do so), *don't* withdraw this patch.  Tell your users
> to recompile if they want to debug code with complex arithmetic.

No, I'm sorry, that's not acceptable logic.  You broke compatibility
with released 2.95.x; 'fixing' GDB for it would break support for that
version of g77.

Also note that the newer of your two compilers above - the Solaris 2.7
package is, I assume, newer - 'R' is used instead of 'r'.  That'll be
handled correctly in GDB whatever the outcome of this discussion (or at
least separately).

-- 
Daniel Jacobowitz                           Carnegie Mellon University
MontaVista Software                         Debian GNU/Linux Developer