[Gambas-devel] Problem while running gbx2/3 with gdb

[Benoit Minisini]

On samedi 30 août 2008, Laurent Carlier wrote:
> I was not able to run gambas 2/3 apps in gdb, as it failed on dlopen()
> calls with an error while loading shared library symbols:
>
> ---8<---
> lordh at ...607...:~/gb2projets/TunnelSDL$ gdb gbx3
> 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 "x86_64-linux-gnu"...
> (gdb) run
> Starting program: /usr/local/bin/gbx3
> [Thread debugging using libthread_db enabled]
> Error while reading shared library symbols:
> Cannot find new threads: generic error
> Cannot find new threads: generic error
> (gdb) bt
> #0  0x00007fe7ac19c7b7 in dl_open_worker () from
> /lib64/ld-linux-x86-64.so.2 #1  0x00007fe7ac198366 in _dl_catch_error ()
> from /lib64/ld-linux-x86-64.so.2 #2  0x00007fe7ac19c0eb in _dl_open () from
> /lib64/ld-linux-x86-64.so.2 #3  0x00007fe7abd04fbb in dlopen_doit () from
> /lib/libdl.so.2
> #4  0x00007fe7ac198366 in _dl_catch_error () from
> /lib64/ld-linux-x86-64.so.2 #5  0x00007fe7abd0536c in _dlerror_run () from
> /lib/libdl.so.2
> #6  0x00007fe7abd04f21 in dlopen@@GLIBC_2.2.5 () from /lib/libdl.so.2
> #7  0x0000000000420999 in LIBRARY_load (lib=0x1eb8400) at gbx_library.c:468
> #8  0x0000000000442377 in COMPONENT_load (comp=0x1eb83a0) at
> gbx_component.c:250
> #9  0x0000000000441f4e in COMPONENT_load_all () at gbx_component.c:110
> #10 0x0000000000420073 in PROJECT_load () at gbx_project.c:456
> #11 0x00000000004330aa in init (file=0x4467b8 ".") at gbx.c:85
> #12 0x000000000043366b in main (argc=1, argv=0x7fffb43a4808) at gbx.c:299
> (gdb) quit
> ---8<---
>
> So i was not able to run gbx code inside gdb (and it's not really  easy to
> do debugging without gdb !).
>
> Then i've filled a bug report in debian (i'm running debian sid x86_64):
> http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=496494
>
> And ask for some help on the gdb Mailing List.
>
> Tonight i've succeeded to find a workaround in forcing linking of gbx with
> the libpthread library.
>
> As far as i know, ubuntu hardy got the same problem, i would ike to ask you
> if you got the same problem, and so this is a possible workaround :-)
>
> Regards,
>

First, you must run gbx3 with the "-p" option to prevent it from forking at 
startup. then, I don't see that gdb has crashed, but just breaked. So maybe 
you can continue the program?

-- 
Benoit Minisini