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Subject:	Re: Used DWARF version for GCC-4.8.1
From:	Juan Manuel Guerrero <juan DOT guerrero AT gmx DOT de>
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Am Montag, 2. September 2013 17:24:51 UTC+2 schrieb Andris Pavenis:
> Updated GCC-4.8.1 packages for DJGPP at
> 
> 
> 
> http://ap1.pp.fi/djgpp/gcc/index.html
> 
> 
> 
> to use DWARF2 by default (it means unless DWARF3/4 is explicitly required).
> 
> Some problems seems to:
> 
> 
> 
> I do not see:
> 
> Breakpoint 1, main () at 1.c:10
> 
> 10        int a = 1;
> 
> (gdb) s
> 
> 11        f(a);
> 
> (gdb)
> 
> f (i=<error reading variable: can't compute CFA for this frame>) at 1.c:5
> 
> 5         printf("a=%d\n", i);
> 
> (gdb) p i
> 
> can't compute CFA for this frame
> 
> (gdb)
> 
> 
> 
> any more with it.
> 
> 
> 
> I simply tried to use xgcc.exe from GCC build directory for testing
> 
> whether debugging works. For example:
> 
> 
> 
> gdb --args xgcc.exe --help
> 
> 
> 
> 1) Messages like 'error reading variable: can't compute CFA for this frame'
> 
>     does not appear any more as it was expected
> 
> 2) Backtrace is often broken: gdb fails to display frame info
> 
> 
> 
> I should perhaps check more with cross-compiler as building
> 
> native compiler simply requires too much time
> 
> 
> 
> Andris

I have given the new compiler a try using it with libiconv 1.14 that I am porting.  I have compiled with -g2 -O0 and I did not experienced the CTA issue anymore.  I also had no difficulties with the bt command, but the function stack was only 4 functions deep.  May be the debugged application that uses libiconv.a was not big enough to trigger the problem.

I am also working on a port of gdb-7.6.1.  Are there any issues that may be considered to allow DWARF4 support for djgpp?  At least at a first glance of
the configure script, there seems to be no switch to select the DWARF version that shall be supported by gdb.  Maybe a lot of time must be invested in this
port to implement djgpp specific issues concerning DWARF4 support.  I do not know if this will happen with this gdb port.

Regards,
Juan M. Guerrero

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