1 files changed, 6 insertions, 0 deletions
diff --git a/common.h b/common.h
index 117972b..e70d922 100644
--- a/common.h
+++ b/common.h
@@ -11,6 +11,12 @@
 #include <string.h>
 
 
+#if defined(__GNUC__)
+__attribute__((__const__))
+#endif
+uint8_t libhashsum_reverse_byte__(uint8_t);
+
+
 #ifdef TEST
 # include <stdlib.h>
 # include <stdio.h>