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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