Re: Question concerning "Local Variables" window and missing variables

["Donna S. Womble" <dsw at mbay dot net>]

Thanks you, Fernando.

The problem is (as you correctly diagnosed) associated with GDB
directly, and not Insight.  It is NOT an optimization issue.  I turned
all optimizing off and the problem remains as initially described... 
the local variables are missing.

I will proceed on to ask the GDB gurus and see what they come up with.
Cheers, Donna.

Fernando Nasser wrote:
> 
> Donna,
> 
> The GUI (Insight) just asks GDB which are the local variables (and GDB, on its turn, gets this information from the compiler).
> 
> Try invoking gdb without the GUI:
>   gdb -nw <your prog>
> 
> It will give you a (gdb) prompt.  Set a breakpoint on line 11 (if the cout is on line 11) with the command:
>   (gdb) break 11
> 
> And then try:
>   (gdb) info locals
> 
> It will, most certainly, not show anything in the first example and show the locals in the second.
> 
> You can them post the same message, removing all references to Windows of any sort and adding the command line commands and output printed, to:
> 
>    gdb@sources.redhat.com
> 
> The people that work with the GDB core may be able to help you.  Or at least this will become a bug report for GDB's handling of C++.
> 
> Regards,
> Fernando
> 
> Donna S Womble wrote:
> >
> > Hello,
> >
> > Please forgive my naivete...  I have generated a very simple C++ program
> > to outline my question/problem.  When I run the following with Insight,
> > and I pull up the "Local Variables" window,  it shows that I have
> > absolutely no local variables no matter where I set a breakpoint.
> >
> > #include <iostream>
> > int main()
> > {
> >   for (int i(0); i < 10; i++)
> >     {
> >       double foo(100.);
> >       for (int j(10); j < 20; j++)
> >         {
> >           double goo(i*1000.);
> >           double hoo(j*500.);
> >           cout << i << "\t" << j << "\t" << goo << "\t" << hoo << endl;
> >         }
> >     }
> >   return 0;
> > }
> >
> > Shouldn't one be able to *see* the variable "i" as a local from within
> > the scope of the i-loop (e.g. at line 6 = double foo(100.); )???
> > Likewise for "j", "goo", and "hoo" inside the j-loop.
> >
> > Strangely enough, if I define foo, goo, and hoo  as doubles before the
> > "i" loop, then I can *see* ALL the variables (including i and j) as in
> > the same code (modified) below:
> >
> > #include <iostream>
> > int main()
> > {
> >   double foo, goo, hoo;
> >   for (int i(0); i < 10; i++)
> >     {
> >       foo = 100.;
> >       int j;
> >       for ( j = 10 ; j < 20; j++)
> >         {
> >           goo = i*1000.;
> >           hoo = j*500.;
> >           cout << i << "\t" << j << "\t" << goo << "\t" << hoo << endl;
> >         }
> >     }
> >   return 0;
> > }
> >
> > Am I missing something really simple here??? Please help.
> > Thanks, Donna Womble.
> >
> > P.S.  I am using Insight version 5.0 with gcc version 2.96 (20000731) on
> > RedHat Linux 7.0
> 
> --
> Fernando Nasser
> Red Hat - Toronto                       E-Mail:  fnasser@redhat.com
> 2323 Yonge Street, Suite #300
> Toronto, Ontario   M4P 2C9