do yy_flex_debug prefix for both C++ and C

diff --git a/main.c b/main.c
index 97f5064cf605ae8535defb9895592a245bda3e94..aee483c296cb1ba88f3ec8fe00649396ebd24b00 100644 (file)
--- a/main.c
+++ b/main.c
@@ -310,6 +310,8 @@ void check_options()
                if ( do_yywrap )
                        GEN_PREFIX( "wrap" );
 
+               GEN_PREFIX( "_flex_debug" );
+
                outn( "" );
                }