Date: Thu, 24 Feb 2000 16:28:03 +0200 (WET)
From: Andris Pavenis <pavenis AT lanet DOT lv>
To: Eli Zaretskii <eliz AT is DOT elta DOT co DOT il>
cc: djgpp-workers AT delorie DOT com
Subject: Re: Debugging difficulties with GCC 2.95.2
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On Thu, 24 Feb 2000, Eli Zaretskii wrote:

> Did someone notice some debugging problems with GCC 2.95.2?  For example, 
> the short test program below, when compiled with GCC 2.95.2, cannot be 
> stepped on the source level.  That is, the following sequence:
> 
> 	gdb fpfunc
> 	b main
> 	r
> 	s
> 
> causes the program to run to completion after the `s' command, instead of 
> stepping into dfunc().  This doesn't happen with GCC 2.7.2.1.  I tried 
> both -g and -gstabs with 2.95.2, it behaves the same with both.
> 
> FWIW, the command to compile was "gcc -Wall -O -g -o fpfunc fpfunc.c".
> 
> This might seem like a toy problem, but I have seen similar problems in 
> much larger programs, like Emacs: some breakpoints simply don't break 
> even though I *know* the program passed those points.  Come to think of 
> it, all the cases I saw were when the breakpoint was set on the entry to 
> a function.  Again, when compiled with GCC 2.7.2.1, the breakpoints 
> behave like expected.
> 
> Any ideas?
> 

Seems that there are similar problems. However for this example using
-gstabs+ instead of -g would help. I sometimes met similar problems with
my own code which heavily uses STL (most tests doen under Linux)

Andris

> 
> #include <math.h>
> 
> double dfunc (double a)
> {
>   return a * sqrt (a);
> }
> 
> float ffunc (float b)
> {
>   return b * (float)dfunc (b);
> }
> 
> int main (int argc, char *argv[])
> {
>   return (dfunc (argc) > 2 ? 0 : 1);
> }
> 
>