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-rw-r--r--lib/Headers/stdalign.h2
-rw-r--r--test/Headers/c11.c6
2 files changed, 8 insertions, 0 deletions
diff --git a/lib/Headers/stdalign.h b/lib/Headers/stdalign.h
index e7fbfa0499..97b18f175b 100644
--- a/lib/Headers/stdalign.h
+++ b/lib/Headers/stdalign.h
@@ -25,6 +25,8 @@
#define __STDALIGN_H
#define alignas _Alignas
+#define alignof _Alignof
#define __alignas_is_defined 1
+#define __alignof_is_defined 1
#endif /* __STDALIGN_H */
diff --git a/test/Headers/c11.c b/test/Headers/c11.c
index 1a3d4d41fe..24a1c2a60d 100644
--- a/test/Headers/c11.c
+++ b/test/Headers/c11.c
@@ -10,3 +10,9 @@ int g();
noreturn int g();
int noreturn g();
int g();
+
+#include <stdalign.h>
+_Static_assert(__alignas_is_defined, "");
+_Static_assert(__alignof_is_defined, "");
+alignas(alignof(int)) char c[4];
+_Static_assert(__alignof(c) == 4, "");