(VECSIZE): Use OFFSETOF.

2 files changed, 7 insertions, 3 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index f5da623e24c..67227b56702 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,7 @@
+2007-04-29  Andreas Schwab  <schwab@suse.de>
+
+        * lisp.h (VECSIZE): Use OFFSETOF.
+
 2007-04-29  YAMAMOTO Mitsuharu  <mituharu@math.s.chiba-u.ac.jp>
 
         * xdisp.c (try_window_reusing_current_matrix): Fix number of
diff --git a/src/lisp.h b/src/lisp.h
index 40ed548e494..d92f4045742 100644
--- a/src/lisp.h
+++ b/src/lisp.h
@@ -735,9 +735,9 @@ struct Lisp_Vector
 
 /* If a struct is made to look like a vector, this macro returns the length
    of the shortest vector that would hold that struct.  */
-#define VECSIZE(type) ((sizeof (type) - (sizeof (struct Lisp_Vector)  \
-                                         - sizeof (Lisp_Object))      \
-                        + sizeof(Lisp_Object) - 1) /* round up */     \
+#define VECSIZE(type) ((sizeof (type)                                     \
+                        - OFFSETOF (struct Lisp_Vector, contents[0])      \
+                        + sizeof(Lisp_Object) - 1) /* round up */         \
                        / sizeof (Lisp_Object))
 
 /* Like VECSIZE, but used when the pseudo-vector has non-Lisp_Object fields