Re: Insight/gdb display issues

[Paul Whitfield <paulw at microsol dot iinet dot net dot au>]

Adam Bezanson wrote:
> Hi,
>
> I'm having issues when I use Insight 5.3 to single step through
> my code. The GUI seems to step around erratically not following
> the exact sequence of commands in my source code. This even happens
> in straight-forward code. For instance, if I have 3 or 4 assignments in a
> row
> like
> 1 a=b;
> 2 c=d;
> 3 e=f;
> 4 g=h
>
> breaking on line 1 and single stepping through will cause the display
> to move from line 1 to line 4, then back to line 1, then line 2, then
> line 1 again, etc... This is the type of behavior I'm seeing.
>
> More on my setup:
> I'm connected to my ARM 920T chip via remote/TCP. I've compiled Insight 5.3
> with --target=arm-linux using the following:
>
> 1) binutils version 2.12.1
> 2) gcc 2.95.3
>
> I'm connected to a Abatron BDI2000 JTAG debugger for ARM targets.
> I've also seen this same behavior using DDD version 3.3.
> I've also spoken to someone else who said they've seen this type of
> behavior on a PPC platform as well.
>
> Since it happens on both Insight and DDD, it seems it must be something with
> GDB???
>
> Am I doing something wrong?
> Any suggestions would be helpful.

What level of optimisation to you have turned on when you compile your code?

If you are using optimisation, what the debugger may be doing is 
actually showing you how the compiler has optimised your code.

Try compiling the code with -O0 and see if that make it behave better.

Paul