(VECSIZE): Use OFFSETOF.

diff --git a/src/lisp.h b/src/lisp.h
index 40ed548e494005eb262d28102f29b0630aaf57e6..d92f4045742f639b2db7eb0cc606efe561a59427 100644 (file)
--- 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