gnome-session [mc-gnome] on amd64 problems.

Joe Marcus Clarke marcus at
Mon Apr 17 22:03:48 UTC 2006

Hash: SHA1

Pascal Hofstee wrote:
> Hi,
> It looks like i stumbled across some pointer-truncation in the current
> MC-gnome gnome-session port on amd64.
> I'll try to outline the problem as i understand it below .. any assistence
> here would be appreciated.
> in ${WORKDIR}/gnome-session/gsm-xrandr.c there's a function called
> "gsm_set_display_properties"
> at line 134 the following call get's made:
> client = gsm_get_conf_client ();
> client is defined in the function definition as GConfClient *client;
> (this definition is inside an #ifdef HAVE_RANDR .. i have tried moving it
> outside the ifdef to no avail though).
> I have stepped through the gsm_get_conf_client() call in a gdb session ..
> and everything seems to be alright including the function's return call. The
> function tries to return a valid 64-bit pointer.
> However .. immediately after the assignment has been done. client now points
> to a (truncated) 32-bit address.
> This obviously causes a problem whenever client is used to get any gconf
> data, which in turn causes gnome-session to segfault.
> My first guess is that somehow the storagesize/datatype for GConfClient is
> being obscured causing the compiler to default it to a 32bit integer, which
> would explain the sudden pointer truncation upon assignment.
> I currently do not have an actual backtrace available .. as i am not writing
> this on my FreeBSD system.
> If anybody has any idea why the pointer gets truncated to 32bit in this
> case, please enlighten me so i can try to test potential fixes.



- --
Joe Marcus Clarke
FreeBSD GNOME Team	::	gnome at
FreeNode / #freebsd-gnome
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