Re: Emacs (today's cvs) aborts under X.

[Lute Kamstra]

Lute Kamstra <address@hidden> writes:

> Richard Stallman <address@hidden> writes:
>
>> Can you see what happens if you put the older X libraries (including
>> LessTif) onto Red Hat 8.0?  Does that make it work?
>
> I tried this with the help of a kind system administrator.  The bug
> does not seem to be related to the X libraries or LessTif.  On a
> Redhat 8.0 system, we replaced XFree86-4.2.0 with XFree86-4.0.3 and
> lesstif-0.93.18 with lesstif-0.92.0.  However, this did not make the
> bug go away.
>
>> If not, the only way to make progress is to study and debug the code
>> in detail.
>
> As I don't have to much time at the moment, I looked at it briefly.
> If I understand things correctly, `abort' is called when Emacs is
> trying to set up the main menubar widget.  Somewhere in the process of
> creating the menubar, `make_menu_in_widget' from lwlib/lwlib-Xm.c is
> called. (This is actually the first time that this function is
> called.)  `abort' is called here:
>
> ,----[ lwlib/lwlib-Xm.c; line 536--542 ]
> |   /* Determine whether WIDGET is a menu bar.  */
> |   type = -1;
> |   XtSetArg (al[0], XmNrowColumnType, &type);
> |   XtGetValues (widget, al, 1);
> |   if (type != XmMENU_BAR && type != XmMENU_PULLDOWN && type != XmMENU_POPUP)
> |     abort ();
> |   menubar_p = type == XmMENU_BAR;
> `----
>
> On the old Redhat 7.1 system, `XtGetValues' sets `type' to
> `XmMENU_BAR'; on Redhat 8.0, `type' remains -1 resulting in the
> `abort' call.
>
> Incidentally, the released Emacs 21.3 works fine on my new Redhat 8.0
> system.
>
> I'm afraid this is as far as my limited understanding of the GUI
> related code takes me.  Maybe you could ask an expert in this field if
> he/she can reproduce the bug?

FWIW, we tested Emacs for this bug in some more environments.  Here is
a summary of the results.


                      Redhat 7.1   Redhat 8.0    Redhat 8.0   Redhat 9
                                   with X libs
                                   and LessTif
                                   from 7.1


XFree86               4.0.3        4.0.3         4.2.0        4.3.0      
LessTif               0.92.0       0.92.0        0.93.18      0.93.36

Emacs 21.3    motif   OK                         OK

Emacs 21.3.50 lucid   OK                         OK           OK
Emacs 21.3.50 motif   OK           aborts        aborts       aborts
Emacs 21.3.50 gtk                                OK           OK


Regards,

  Lute.

-- 
Lute Kamstra  <address@hidden>
CWI  department PNA4
Room M233  phone (+31) 20 592 4214
[Echelon material: CDMA argus unclassified]