Print warning if not using native coroutine.

1 files changed, 2 insertions, 0 deletions

diff --git a/cont.c b/cont.c
index dacc241515..3a141c4440 100644
--- a/cont.c
+++ b/cont.c
@@ -45,6 +45,8 @@
 #ifdef FIBER_USE_COROUTINE
 #include FIBER_USE_COROUTINE
 #define FIBER_USE_NATIVE 1
+#else
+#pragma message "Native coroutine not available!" 
 #endif
 
 #if !defined(FIBER_USE_NATIVE)