[Vala] How can I disable the gdb integration?

[Alberto Mardegan <alberto mardegan canonical com>]

Hi all,
  when running my application under gdb I get the following:

=============
> Program received signal SIGSEGV, Segmentation fault.
> publishing_ui_publishing_dialog_account_service_copy (self=self entry=0x0, dest=dest entry=0x7fffffffcae0)
>     at /media/mardy/Data/src/bzr/shotwell/build-area/shotwell-0.12.90/src/publishing/PublishingUI.vala:133
> 133         private struct AccountService {
> (gdb) bt
> #0  publishing_ui_publishing_dialog_account_service_copy (self=self entry=0x0, dest=dest entry=0x7fffffffcae0)
>     at /media/mardy/Data/src/bzr/shotwell/build-area/shotwell-0.12.90/src/publishing/PublishingUI.vala:133
> #1  0x00000000004e1f25 in publishing_ui_publishing_dialog_on_service_changed (self=self entry=0xa5e2a0)
>     at /media/mardy/Data/src/bzr/shotwell/build-area/shotwell-0.12.90/src/publishing/PublishingUI.vala:415
[...]
=============

"publishing_ui_publishing_dialog_account_service_copy" is a C function 
generated by Vala. However, if I type "list" in gdb all I see is the 
definition of my "struct AccountService".
I would like to be able to see a backtrace with the C functions, and be 
able to navigate through them.
Any hints?

TIA,
  Alberto