OK
Thanks.
Good to know.
> From: "Jakub Jelinek" <ja...@redhat.com>
> To: "Community support for Fedora users" <users@lists.fedoraproject.org>
> Cc: "Patrick Dupre" <pdu...@gmx.com>
> Subject: Re: gcc
>
> On Mon, Jul 07, 2025 at 02:37:44PM +0200, Patrick Dupre via users wrote:
> > Hello,
> >
> > I am trying to generate a rpm package (perl-Tk-Zinc) from a source file.
> > No problem in fedora 40, but it fails in fedora 42
> > The reason seems to be due to gcc: gcc 14 in fedora 40, and gcc 15 in
> > fedora 15
> >
> > Th error message is
> > Field.c:1746:8: error: too many arguments to function ‘cb’; expected 0,
> > have 9
> > 1746 | (*cb)(wi, fptr, &bbox, &pm_bbox,
> > | ~^~~~ ~~
> > Field.c: In function ‘RenderField’:
> >
> >
> > It is due to
> > static void
> > FieldsEngine(ZnFieldSet field_set,
> > void (*cb)())
> > {
> > ZnWInfo *wi = field_set->item->wi;
> > /*int i; This one *NEED* to be an int */
> > unsigned int i, num_fields, num_chars;
> > Field fptr;
> > ZnTextInfo *ti = &wi->text_info;
> > ZnBBox lclip_bbox, fclip_bbox, bbox, *global_clip_box;
> > ZnBBox tmp_bbox, text_bbox, pm_bbox;
> > ZnPoint pts[2];
> > ZnTriStrip tristrip;
> > ZnPoint text_pos;
> > ZnBool restore = False;
> > ZnDim lwidth, lheight;
> > ZnReal val;
> > int cursor;
> > int sel_start, sel_stop;
> >
> > if (!field_set->num_fields) {
> > return;
> > }
> >
> > with the call
> >
> > (*cb)(wi, fptr, &bbox, &pm_bbox,
> > &text_pos, &text_bbox, cursor, sel_start, sel_stop);
>
> That is invalid C23, and GCC 15 defaults to -std=gnu23.
> In C17 and earlier, type fn (); meant a function with type return type
> and unspecified arguments, in C23 this means the same as in C++,
> function with no arguments, same as type fn (void);
> If cb is only used for functions with 9 arguments with compatible types,
> then fix it by changing void (*cb)() to
> void (*cb)(ZnWinfo *, Field, ZnBBox *, ZnBBox *, ZnPoint *, ZnBBox *, int,
> int, int)
> If it is used for functions with different argument types and their count,
> then you need to rework the code. Perhaps it could use ... functions (but
> note that all the functions passed to it have to be then declared and
> defined with ...), or pass union of several different function pointers,
> whatever.
>
> Or temporarily use -std=gnu17.
>
> See also https://gcc.gnu.org/gcc-15/porting_to.html#c23
>
> Jakub
>
>
--
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