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-rw-r--r--lib/stdalign.in.h9
1 files changed, 7 insertions, 2 deletions
diff --git a/lib/stdalign.in.h b/lib/stdalign.in.h
index a990050b67..c6115b6dbe 100644
--- a/lib/stdalign.in.h
+++ b/lib/stdalign.in.h
@@ -64,7 +64,9 @@
# define _Alignof(type) offsetof (struct { char __a; type __b; }, __b)
# endif
#endif
-#define alignof _Alignof
+#if ! (defined __cplusplus && 201103 <= __cplusplus)
+# define alignof _Alignof
+#endif
#define __alignof_is_defined 1
/* alignas (A), also known as _Alignas (A), aligns a variable or type
@@ -105,8 +107,11 @@
# define _Alignas(a) __declspec (align (a))
# endif
#endif
-#if defined _Alignas || (defined __STDC_VERSION && 201112 <= __STDC_VERSION__)
+#if ((defined _Alignas && ! (defined __cplusplus && 201103 <= __cplusplus)) \
+ || (defined __STDC_VERSION && 201112 <= __STDC_VERSION__))
# define alignas _Alignas
+#endif
+#if defined alignas || (defined __cplusplus && 201103 <= __cplusplus)
# define __alignas_is_defined 1
#endif