c-decl.c (define_label): Warn about identifier conflicts with labels in traditional C.

* c-decl.c (define_label): Warn about identifier conflicts with
	labels in traditional C.

	* c-parse.in (unop +): Warn about the unary plus operator for
	traditional C.

	* c-typeck.c (store_init_value): Warn about automatic aggregate
	initialization for traditional C.

	* invoke.texi (-Wtraditional): Document new warnings.

From-SVN: r34997

gcc/ChangeLog

@@ -1,3 +1,16 @@
+2000-07-12  Kaveh R. Ghazi  <ghazi@caip.rutgers.edu>
+
+	* c-decl.c (define_label): Warn about identifier conflicts with
+	labels in traditional C.
+
+	* c-parse.in (unop +): Warn about the unary plus operator for
+	traditional C.
+
+	* c-typeck.c (store_init_value): Warn about automatic aggregate
+	initialization for traditional C.
+
+	* invoke.texi (-Wtraditional): Document new warnings.
+
 2000-07-12  Gabriel Dos Reis  <gdr@codesourcery.com>
 
 	* Makefile.in (c-errors.o): Fix thinko in dependency.

gcc/c-decl.c

@@ -2706,6 +2706,10 @@ define_label (filename, line, name)
       decl = lookup_label (name);
     }
 
+  if (warn_traditional && lookup_name (name))
+    warning ("traditional C lacks a separate namespace for labels, identifier `%s' conflicts",
+	     IDENTIFIER_POINTER (name));
+  
   if (DECL_INITIAL (decl) != 0)
     {
       error ("duplicate label `%s'", IDENTIFIER_POINTER (name));

gcc/c-parse.in

@@ -411,7 +411,12 @@ unop:     '&'
 	| '-'
 		{ $$ = NEGATE_EXPR; }
 	| '+'
-		{ $$ = CONVERT_EXPR; }
+		{ $$ = CONVERT_EXPR;
+ifc
+  if (warn_traditional)
+    warning ("traditional C rejects the unary plus operator");
+end ifc
+		}
 	| PLUSPLUS
 		{ $$ = PREINCREMENT_EXPR; }
 	| MINUSMINUS

gcc/c-typeck.c

@@ -4401,6 +4401,10 @@ store_init_value (decl, init)
     }
 #endif
 
+  if (warn_traditional
+      && AGGREGATE_TYPE_P (TREE_TYPE (decl)) && ! TREE_STATIC (decl))
+    warning ("traditional C rejects automatic aggregate initialization");
+
   DECL_INITIAL (decl) = value;
 
   /* ANSI wants warnings about out-of-range constant initializers.  */

gcc/invoke.texi

@@ -1824,6 +1824,16 @@ Usage of ANSI string concatenation is detected.
 
 @item
 A function macro appears without arguments.
+
+@item
+The unary plus operator.
+
+@item
+Initialization of automatic aggregates.
+
+@item
+Identifier conflicts with labels.  Traditional C lacks a separate
+namespace for labels.
 @end itemize
 
 @item -Wundef