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Date: Sat, 03 Aug 2013 21:16:29 +0300
From: Andris Pavenis <andris DOT pavenis AT iki DOT fi>
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To: djgpp AT delorie DOT com
CC: Juan Manuel Guerrero <juan DOT guerrero AT gmx DOT de>
Subject: Re: Programs compiled with gcc481 cannot be debugged with gdb.
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Reply-To: djgpp AT delorie DOT com

On 06/08/2013 07:57 PM, Juan Manuel Guerrero wrote:
> I have compiled it using gcc-4.8.1 with the following command:
>    gcc -Wall -g2 -O0 a.c
> When I try to use gdb to step through the code I get
> the following error message:
>
> GNU gdb (GDB) 7.6
> Copyright (C) 2013 Free Software Foundation, Inc.
> (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)
>
>
> The important issue is to try to step into a function.
> As long as I do not step into a function every thing works OK.
> The same happens if I use gcc480.  If I use gcc473 every thing
> works OK.  The program itself runs flawlessly.
> Am I missing something?  Is the coff/dwarf support in gcc-4.8.N
> brocken?
>
> If more info is needed, please tell.

I do not really know. I have the same problem with gcc-4.9 snapshots. So
something has changed with release of gcc-4.8. I guess somebody should try to
debug gdb and check what happens in dwarf2_frame_cfa() in dwarf2_frame.c.

Tried to build gdb-6.6 for DJGPP myself (using gcc-4.6), but the built
gdb.exe did not work (it failed when I tried to start debugging some program).

Andris