Index: libcfa/src/concurrency/io/setup.cfa
===================================================================
--- libcfa/src/concurrency/io/setup.cfa	(revision d3605f8b23383df7dd28db382d22350cf8eb7e71)
+++ libcfa/src/concurrency/io/setup.cfa	(revision 08e4e6a1759271a9927038cb8b6d639b85db3fde)
@@ -32,5 +32,5 @@
 
 	void __cfa_io_start( processor * proc ) {}
-	bool __cfa_io_flush( processor * proc, int ) {}
+	bool __cfa_io_flush( processor * proc, int ) { return false; }
 	void __cfa_io_stop ( processor * proc ) {}