Define type mrb_bool. It is typedef-ed to _Bool on C99, unsigned int on MSVC.

It is safer than applying 1bit bit-fields to signed int.

For forward compatibility, you should substiture only 1 or 0 for the variable typed mrb_bool.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/gc.c b/src/gc.c
index da6844fa5..ab50529f7 100644
--- a/src/gc.c
+++ b/src/gc.c
@@ -197,7 +197,7 @@ struct heap_page {
   struct heap_page *next;
   struct heap_page *free_next;
   struct heap_page *free_prev;
-  unsigned int old:1;
+  mrb_bool old:1;
   RVALUE objects[MRB_HEAP_PAGE_SIZE];
 };