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

Benoit Minisini gambas at ...1...
Sat Aug 30 07:58:02 CEST 2008


On samedi 30 août 2008, Benoit Minisini wrote:
> 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?

I read your bug report: what prevents gbx from being linked with "-lphtread"? 
It is already the case on BSD systems.

-- 
Benoit Minisini




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