lex.c (parse_strconst_pragma): Return error_mark_node instead of "(tree)-1" to indicate failure.

	* lex.c (parse_strconst_pragma): Return error_mark_node instead of
	"(tree)-1" to indicate failure.  Simplify.
	(handle_pragma_interface): Test for error_mark_node instead of
	"(tree)-1".
	(handle_pragma_implementation): Likewise.

From-SVN: r110932

gcc/cp/ChangeLog

 2006-02-13  Volker Reichelt  <reichelt@igpm.rwth-aachen.de>
 
+	* lex.c (parse_strconst_pragma): Return error_mark_node instead of
+	"(tree)-1" to indicate failure.  Simplify.
+	(handle_pragma_interface): Test for error_mark_node instead of
+	"(tree)-1".
+	(handle_pragma_implementation): Likewise.
+
+2006-02-13  Volker Reichelt  <reichelt@igpm.rwth-aachen.de>
+
 	PR c++/26151
 	* parser.c (cp_parser_decl_specifier_seq): Check for duplicate
 	decl-specifiers.  Remove extra check for duplicate 'friend'.

gcc/cp/lex.c

@@ -460,20 +460,19 @@ parse_strconst_pragma (const char* name, int opt)
   tree result, x;
   enum cpp_ttype t;
 
-  t = pragma_lex (&x);
+  t = pragma_lex (&result);
   if (t == CPP_STRING)
     {
-      result = x;
       if (pragma_lex (&x) != CPP_EOF)
 	warning (0, "junk at end of #pragma %s", name);
       return result;
     }
 
   if (t == CPP_EOF && opt)
-    return 0;
+    return NULL_TREE;
 
   error ("invalid #pragma %s", name);
-  return (tree)-1;
+  return error_mark_node;
 }
 
 static void
@@ -497,7 +496,7 @@ handle_pragma_interface (cpp_reader* dfile ATTRIBUTE_UNUSED )
   struct c_fileinfo *finfo;
   const char *filename;
 
-  if (fname == (tree)-1)
+  if (fname == error_mark_node)
     return;
   else if (fname == 0)
     filename = lbasename (input_filename);
@@ -537,7 +536,7 @@ handle_pragma_implementation (cpp_reader* dfile ATTRIBUTE_UNUSED )
   const char *filename;
   struct impl_files *ifiles = impl_file_chain;
 
-  if (fname == (tree)-1)
+  if (fname == error_mark_node)
     return;
 
   if (fname == 0)