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$NetBSD: patch-ac,v 1.1 2007/11/30 20:30:22 rillig Exp $
gcc4 complains about an invalid lvalue.
--- src/obstack.h.orig 1998-09-12 16:59:34.000000000 +0200
+++ src/obstack.h 2007-11-30 21:27:21.000000000 +0100
@@ -417,7 +417,7 @@ __extension__ \
({ struct obstack *__o = (OBSTACK); \
if (__o->next_free + sizeof (void *) > __o->chunk_limit) \
_obstack_newchunk (__o, sizeof (void *)); \
- *((void **)__o->next_free)++ = ((void *)datum); \
+ *(*((void ***)&(__o->next_free)))++ = ((void *)datum); \
(void) 0; })
#define obstack_int_grow(OBSTACK,datum) \
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