parse.y (sizeof, [...]): New non-terminals to increment skip_evaluation.

* parse.y (sizeof, alignof, typeof): New non-terminals to
increment skip_evaluation.  Replace terminals with them and
decrement skip_evaluation at the end of rules using them.
* decl2.c (mark_used): Don't assemble_external if
skipping evaluation.

From-SVN: r56359

gcc/cp/ChangeLog

+2002-08-15  Alexandre Oliva  <aoliva@redhat.com>
+
+	* parse.y (sizeof, alignof, typeof): New non-terminals to
+	increment skip_evaluation.  Replace terminals with them and
+	decrement skip_evaluation at the end of rules using them.
+	* decl2.c (mark_used): Don't assemble_external if
+	skipping evaluation.
+
 2002-08-15  Gabriel Dos Reis  <gdr@nerim.net>
 
 	Fix PR/7504

gcc/cp/decl2.c

@@ -4717,7 +4717,8 @@ mark_used (decl)
   TREE_USED (decl) = 1;
   if (processing_template_decl)
     return;
-  assemble_external (decl);
+  if (!skip_evaluation)
+    assemble_external (decl);
 
   /* Is it a synthesized method that needs to be synthesized?  */
   if (TREE_CODE (decl) == FUNCTION_DECL

gcc/cp/parse.y

@@ -1277,16 +1277,20 @@ unary_expr:
 	/* Refer to the address of a label as a pointer.  */
 	| ANDAND identifier
 		{ $$ = finish_label_address_expr ($2); }
-	| SIZEOF unary_expr  %prec UNARY
-		{ $$ = finish_sizeof ($2); }
-	| SIZEOF '(' type_id ')'  %prec HYPERUNARY
+	| sizeof unary_expr  %prec UNARY
+		{ $$ = finish_sizeof ($2);
+		  skip_evaluation--; }
+	| sizeof '(' type_id ')'  %prec HYPERUNARY
 		{ $$ = finish_sizeof (groktypename ($3.t));
-		  check_for_new_type ("sizeof", $3); }
-	| ALIGNOF unary_expr  %prec UNARY
-		{ $$ = finish_alignof ($2); }
-	| ALIGNOF '(' type_id ')'  %prec HYPERUNARY
+		  check_for_new_type ("sizeof", $3);
+		  skip_evaluation--; }
+	| alignof unary_expr  %prec UNARY
+		{ $$ = finish_alignof ($2);
+		  skip_evaluation--; }
+	| alignof '(' type_id ')'  %prec HYPERUNARY
 		{ $$ = finish_alignof (groktypename ($3.t));
-		  check_for_new_type ("alignof", $3); }
+		  check_for_new_type ("alignof", $3);
+		  skip_evaluation--; }
 
 	/* The %prec EMPTY's here are required by the = init initializer
 	   syntax extension; see below.  */
@@ -2004,6 +2008,18 @@ reserved_typespecquals:
 		{ $$ = tree_cons ($1, NULL_TREE, NULL_TREE); }
 	;
 
+sizeof:
+	SIZEOF { skip_evaluation++; }
+	;
+
+alignof:
+	ALIGNOF { skip_evaluation++; }
+	;
+
+typeof:
+	TYPEOF { skip_evaluation++; }
+	;
+
 /* A typespec (but not a type qualifier).
    Once we have seen one of these in a declaration,
    if a typedef name appears then it is being redeclared.  */
@@ -2015,12 +2031,14 @@ typespec:
 		{ $$.t = $1; $$.new_type_flag = 0; $$.lookups = NULL_TREE; }
 	| complete_type_name
 		{ $$.t = $1; $$.new_type_flag = 0; $$.lookups = NULL_TREE; }
-	| TYPEOF '(' expr ')'
+	| typeof '(' expr ')'
 		{ $$.t = finish_typeof ($3);
-		  $$.new_type_flag = 0; $$.lookups = NULL_TREE; }
-	| TYPEOF '(' type_id ')'
+		  $$.new_type_flag = 0; $$.lookups = NULL_TREE;
+		  skip_evaluation--; }
+	| typeof '(' type_id ')'
 		{ $$.t = groktypename ($3.t);
-		  $$.new_type_flag = 0; $$.lookups = NULL_TREE; }
+		  $$.new_type_flag = 0; $$.lookups = NULL_TREE;
+		  skip_evaluation--; }
 	| SIGOF '(' expr ')'
 		{ tree type = TREE_TYPE ($3);