bug#38771: Allow face-attribute to be 'reset, (in addition the usual 'unspecified and valid-values)

[Lars Ingebrigtsen]

Eli Zaretskii <eliz@gnu.org> writes:

> I've now implemented this on master. 

Great!

I'm getting the following compilation warning (gcc (Ubuntu
11.2.0-19ubuntu1)) now:

In file included from xfaces.c:226:
xfaces.c: In function ‘Finternal_set_lisp_face_attribute’:
lisp.h:337:26: warning: ‘tmp’ may be used uninitialized in this function 
[-Wmaybe-uninitialized]
  337 | #  define lisp_h_XLI(o) ((EMACS_INT) (o))
      |                          ^
xfaces.c:3539:23: note: ‘tmp’ was declared here
 3539 |           Lisp_Object tmp;
      |                       ^~~

(I haven't checked whether it's a valid warning or not.)

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