Problems printing variables in sparc-rtems4.11-gdb 7.6

[Jiri Gaisler]

On 05/29/2013 01:42 PM, Ralf Kirchner wrote:
> Hi All,
> I noticed a strange problem with gdb version 7.6 (our current RPM version)
> Printing variables in in gdb is not possible.

I have the same problem on both gdb-7.5 and 7.6 (ubuntu 12.04 x64).
Some variables print OK, some get the 'can't compute CFA' error.
Gdb version 7.4 and earlier cannot read the symbol table at all, probably
due to unsupported dwarf version 4 produced by sparc-rtems4.11-gcc (gcc-4.8).
Most annoying ....


Jiri.

> 
> Scenario:
> rk at linux-aiv4:~/git-rtems-testing/rtems/build-sparc-sis-rtems/sparc-rtems4.11/c/sis/testsuites/fstests/fsdosfsname01
>> sparc-rtems4.11-gdb *.exe
> GNU gdb (GDB) 7.6
> Copyright (C) 2013 Free Software Foundation, Inc.
> License GPLv3+: GNU GPL version 3 or later
> <http://gnu.org/licenses/gpl.html>
> This is free software: you are free to change and redistribute it.
> There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
> and "show warranty" for details.
> This GDB was configured as "--host=x86_64-suse-linux-gnu
> --target=sparc-rtems4.11".
> For bug reporting instructions, please see:
> <http://www.gnu.org/software/gdb/bugs/>...
> Reading symbols from
> /scratch/git-rtems-testing/rtems/build-sparc-sis-rtems/sparc-rtems4.11/c/sis/testsuites/fstests/fsdosfsname01/fsdosfsname01.exe...done.
> (gdb) tar sim
> Connected to the simulator.
> (gdb) load
> (gdb) break Init
> Breakpoint 1 at 0x2004338: file
> ../../../../../../../git-rtems/c/src/../../testsuites/fstests/fsdosfsname01/init.c,
> line 1295.
> (gdb) run
> Starting program:
> /scratch/git-rtems-testing/rtems/build-sparc-sis-rtems/sparc-rtems4.11/c/sis/testsuites/fstests/fsdosfsname01/fsdosfsname01.exe
> 
> 
> Breakpoint 1, Init (arg=<error reading variable: can't compute CFA for
> this frame>) at
> ../../../../../../../git-rtems/c/src/../../testsuites/fstests/fsdosfsname01/init.c:1295
> 1295	  puts( "\n\n*** TEST fsdosfsname01 ***" );
> (gdb) p arg
> can't compute CFA for this frame
> (gdb)
> 
> Has anybody else seen such problems with gdb 7.6?
> Am I doing anything wrong? Does version 7.6 need any special treatment
> to work correctly?
> 
> Kind Regards
> 	Ralf Kirchner
>