# HG changeset patch
# User Paul Eggert <eggert@cs.ucla.edu>
# Date 1092114989 0
# Node ID 663a1b941e5141916137b2db1245293250f45877
# Parent  43b6cc039c4910bd9a1d6fa13f727efc0d144172
(obstack_empty_p): Don't assume that chunk->contents is suitably
aligned.

diff --git a/lib/obstack.h b/lib/obstack.h
--- a/lib/obstack.h
+++ b/lib/obstack.h
@@ -287,7 +287,10 @@
 # define obstack_empty_p(OBSTACK)					\
   __extension__								\
   ({ struct obstack const *__o = (OBSTACK);				\
-     (__o->chunk->prev == 0 && __o->next_free - __o->chunk->contents == 0); })
+     (__o->chunk->prev == 0						\
+      && __o->next_free == __PTR_ALIGN ((char *) __o->chunk,		\
+					__o->chunk->contents,		\
+					__o->alignment_mask)); })
 
 # define obstack_grow(OBSTACK,where,length)				\
 __extension__								\
@@ -411,7 +414,10 @@
  (unsigned) ((h)->chunk_limit - (h)->next_free)
 
 # define obstack_empty_p(h) \
- ((h)->chunk->prev == 0 && (h)->next_free - (h)->chunk->contents == 0)
+ ((h)->chunk->prev == 0							\
+  && (h)->next_free == __PTR_ALIGN ((char *) (h)->chunk,		\
+				    (h)->chunk->contents,		\
+				    (h)->alignment_mask))
 
 /* Note that the call to _obstack_newchunk is enclosed in (..., 0)
    so that we can avoid having void expressions