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-rw-r--r--gl/lib/rand-isaac.c14
1 files changed, 13 insertions, 1 deletions
diff --git a/gl/lib/rand-isaac.c b/gl/lib/rand-isaac.c
index c03242f66..3462b6d4b 100644
--- a/gl/lib/rand-isaac.c
+++ b/gl/lib/rand-isaac.c
@@ -35,6 +35,18 @@
#include "rand-isaac.h"
#include <limits.h>
+#include <string.h>
+
+/* If the platform supports unaligned access,
+ then don't have -fsanitize=undefined warn about it. */
+#undef ATTRIBUTE_NO_WARN_SANITIZE_UNDEFINED
+#if !_STRING_ARCH_unaligned \
+ || __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 9)
+# define ATTRIBUTE_NO_WARN_SANITIZE_UNDEFINED /* empty */
+#else
+# define ATTRIBUTE_NO_WARN_SANITIZE_UNDEFINED \
+ __attribute__ ((__no_sanitize_undefined__))
+#endif
/* The minimum of two sizes A and B. */
static inline size_t
@@ -81,7 +93,7 @@ ind (isaac_word const *m, isaac_word x)
}
/* Use and update *S to generate random data to fill RESULT. */
-void
+void ATTRIBUTE_NO_WARN_SANITIZE_UNDEFINED
isaac_refill (struct isaac_state *s, isaac_word result[ISAAC_WORDS])
{
/* Caches of S->a and S->b. */