gcc gets upset when we do "((GDestroyNotify) destroy) (_p)" because
it's non-portable. But we don't care; we already know glib wouldn't
work on any platform where different pointer types have different
calling conventions. So tweak the code to avoid the warning.
https://bugzilla.gnome.org/show_bug.cgi?id=674634
/* Only one access, please */ \
gpointer *_pp = (gpointer *) (pp); \
gpointer _p; \
+ /* This assignment is needed to avoid a gcc warning */ \
+ GDestroyNotify _destroy = (GDestroyNotify) (destroy); \
\
(void) (0 ? (gpointer) *(pp) : 0); \
do \
while G_UNLIKELY (!g_atomic_pointer_compare_and_exchange (_pp, _p, NULL)); \
\
if (_p) \
- ((GDestroyNotify) (destroy)) (_p); \
+ _destroy (_p); \
} G_STMT_END
/* Optimise: avoid the call to the (slower) _n function if we can