add BUILD_BUG_ON from the kernel

diff --git a/utils.h b/utils.h
index 99b1c0d2d8798e9427195d31dfc118be44d24e6a..3918cace912ae745496f68a08ae7effd3ee5525f 100644 (file)
--- a/utils.h
+++ b/utils.h
@@ -5,6 +5,17 @@
 #include <libubox/avl.h>
 #include <libubox/blobmsg.h>
 
+#ifndef __OPTIMIZE__
+#define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))
+#else
+extern int __build_bug_on_failed;
+#define BUILD_BUG_ON(condition)                                 \
+       do {                                                    \
+               ((void)sizeof(char[1 - 2*!!(condition)]));  \
+               if (condition) __build_bug_on_failed = 1;   \
+       } while(0)
+#endif
+
 static inline bool blobmsg_get_bool_default(struct blob_attr *attr, bool val)
 {
        if (!attr)