C11: Provide the missing half of <stdalign.h>

llvm-svn: 173900

diff --git a/clang/lib/Headers/stdalign.h b/clang/lib/Headers/stdalign.h
index e7fbfa0..97b18f1 100644 (file)
--- a/clang/lib/Headers/stdalign.h
+++ b/clang/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/clang/test/Headers/c11.c b/clang/test/Headers/c11.c
index 1a3d4d4..24a1c2a 100644 (file)
--- a/clang/test/Headers/c11.c
+++ b/clang/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, "");