Re: GType typedef API/ABI break.

[Tim Janik <timj gtk org>]

On Fri, 22 Jun 2007, Murray Cumming wrote:

> I sent this to gtk-list by mistake. Re-sending it to gtk-devel-list:
>
> I think the recent change to the GType definition is causing linker
> errors by changing the GType definition from gulong to gsize. We are
> left with the #else definition that was previously commented as "/* hm,
> shouldn't happen? */"
>
> This is the change:
> http://svn.gnome.org/viewcvs/glib/trunk/gobject/gtype.h?r1=5497&r2=5560
> With this ChangeLog entry:
> http://svn.gnome.org/viewcvs/glib?view=revision&revision=5560
>
> This is causing linker errors in almost everything that uses glib and C
> ++, such as gtkmm and Inkscape, because the parameter type in, e.g.
>  void get_defs(GType)
> is part of the function signature.
>
> For instance, glibmm's library contains a
>  void get_defs(unsigned long)
> But now, when building gtkmm, the linker is looking for
>  void get_defs(unsigned int)
> and failing.

hm, just to clarify explicitely, actual C ABI wasn't broken by
this change. i guess we can workaround the C++ linking issues
by reintroducing
  typedef gulong GType;
if GLIB_SIZEOF_LONG == GLIB_SIZEOF_SIZE_T && defined __cplusplus.
that'll just leave C++ with bogus warnings about %zu again.

> --
> Murray Cumming

---
ciaoTJ