cppexp.c (parse_defined): Improve diagnostics for invalid syntax.

        * cppexp.c (parse_defined): Improve diagnostics for invalid
        syntax.

From-SVN: r39500

gcc/ChangeLog

 2001-02-06  Neil Booth  <neil@daikokuya.demon.co.uk>
 
+        * cppexp.c (parse_defined): Improve diagnostics for invalid
+        syntax.
+
+2001-02-06  Neil Booth  <neil@daikokuya.demon.co.uk>
+
         * cppmacro.c (cpp_get_token): Avoid pasting after a builtin.
 
 2001-02-06  Mark Mitchell  <mark@codesourcery.com>

gcc/cppexp.c

@@ -344,7 +344,20 @@ parse_defined (pfile)
 	}
     }
   else
-    cpp_error (pfile, "\"defined\" without an identifier");
+    {
+      cpp_error (pfile, "operator \"defined\" requires an identifier");
+      if (token.flags & NAMED_OP)
+	{
+	  cpp_token op;
+
+	  op.flags = 0;
+	  op.type = token.type;
+	  cpp_error (pfile,
+		     "(\"%s\" is an alternative token for \"%s\" in C++)",
+		     cpp_token_as_text (pfile, &token),
+		     cpp_token_as_text (pfile, &op));
+	}
+    }
 
   if (!node)
     op.op = CPP_ERROR;