Index: src/main.cc
===================================================================
--- src/main.cc	(revision 4a8c8752b2846dd89aff5883d03ff72a840d09fa)
+++ src/main.cc	(revision 2a7e29b9f4c8e0d554bac2d1b9356c11a4fbcaba)
@@ -203,4 +203,7 @@
 		} else {
 			input = stdin;
+			// if running cfa-cpp directly, might forget to pass -F option. Since this takes from stdin, pass
+			// a fake name along
+			if ( filename == NULL ) filename = "stdin";
 		} // if