Re: c++/8542: GBD broken under gcc 3.2 - can't print any local variables or class members

[Daniel Jacobowitz <drow at mvista dot com>]

Ron,

FYI, your problem is different from the originally reported problem in
this PR (which I still haven't looked at...).  If you get a CVS version
of GDB, I think you'll be able to see local variables again (most of
the time).  The most complex cases still don't work quite right.

On Tue, Nov 19, 2002 at 11:17:33AM -0800, Ron Eastman wrote:
> Salutations,
> 
> I've been having the same problem with gcc 3.2 and gdb...
> 
> I don't know whether this will be of much use to anyone, but  after some
> amount of experimentation it seems to me that the problem is related in
> somehow to objects which have destructors (or constructors?). Unfortunately
> the code I am working on is large and proprietary, so I can't provide you
> with an example as I would like. What I found --by removing all the code
> from main() and then adding it back bit by bit--is that a certain point was
> reached where, if I added just one additional declaration (e.g. "string
> datapath;") then when compiled and fired up in gdb, the local variables are
> not visible. Remove that one declaration, and they are. I don't think there
> was anything wrong with that particular declaration--other string variables
> were declared further up in main. Furthermore, if instead of "string
> datapath" I put in "double foo;", then local variables ARE visible. "double"
> has no destructor. Make it "vector foo;" and the problem returns.  I tried
> several different objects with constructors/destructors and reliably
> reproduced the problem. Note also that: if I put braces around the
> declaration ("{string foo;}") then the problem disappeared.
> 
> I hope this helps.
> 
> Ron Eastman
> 
> http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&p
> r=8542
> 
> 
> Ronald G. Eastman
> Schonfeld Securities LLC
> 2185 North California Boulevard
> Suite 320, Walnut Creek, CA 94596
> (925) 256-2464
> (925) 256-4548 (fax)
> ron_eastman@schonfeld.com
> 

-- 
Daniel Jacobowitz
MontaVista Software                         Debian GNU/Linux Developer