Re: [avr-gcc-list] local variables in ddd

[Gre7g Luterman]

--- Javier Almansa Sobrino <address@hidden>
wrote:

> Hi everyone. I'm trying to simulate and trace a
> program developed with
> avr-gcc, but I'm not able to see the value of any
> local variable with
> ddd or avr-gdb.

This is a common problem that is not simply solved. 
gcc is optimizing your code to the point where the
variable you are interested is no longer being stored
in memory, this keeps ddd from looking at it.

Some options:

* Reduce gcc's optimization while debugging (be sure
to turn it back on once the bugs are removed).

* Mark the variable(s) you are interested in as
"volatile" (again, make sure you un-do this later).

* Add code to store important values in a volatile
location:

#ifdef DEBUG
volatile uint16_t DebugTrace;
#endif

x = f(y);
#ifdef DEBUG
DebugTrace = x;
#endif
z = g(x);
#ifdef DEBUG
DebugTrace = z;
#endif

HTH,
Gre7g

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