Single stepping and "no line information"

Stefano Sabatini stefano.sabatini-lala@poste.it
Mon Sep 8 13:46:00 GMT 2008


On date Monday 2008-09-08 15:39:53 +0200, Stefano Sabatini wrote:
> I'm debugging an application which use a shared lib.
> 
> That library has been compiled on my system, and I added to the CFLAGS
> used the -ggdb -O0 flags, so I'm quite sure that lib should contain
> the source line symbol informations.
> 
> Nonetheless when I try to step into the library functions I get:
> 
> (gdb) s
> Single stepping until exit from function su_clone_start, 
> which has no line number information.
> 
> stefano@geppetto ~/s/ptlib> gdb --version
> GNU gdb 6.8-debian
> Copyright (C) 2008 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 "i486-linux-gnu".
> 
> Why gdb can't find the source line informations?
> 
> How can I verify (e.g. with a commandline tool) wether that
> information is present directly analyzing the library files?

I tried with:
nm --line-numbers libfoo.so | grep foo

and indeed I get the symbol with its line and file information.

Could it be a gdb bug?

Regards.



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