Merge FreeBSD modifications into gcc 3.2.1-prerelease:

1.2  framework for our kernel printf enhancements
  1.3  suppress prototype warning for K&R main

Approved by:	obrien

contrib/gcc/c-common.h

@@ -474,6 +474,11 @@ extern int warn_conversion;
 
 extern int warn_long_long;
 
+/* Nonzero means the expression being parsed will never be evaluated.
+   This is a count, since unevaluated expressions can nest.  */
+
+extern int skip_evaluation;
+
 /* C types are partitioned into three subsets: object, function, and
    incomplete types.  */
 #define C_TYPE_OBJECT_P(type) \