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-rw-r--r--lib/stdalign.in.h23
1 files changed, 17 insertions, 6 deletions
diff --git a/lib/stdalign.in.h b/lib/stdalign.in.h
index 29861efe1..41913c0be 100644
--- a/lib/stdalign.in.h
+++ b/lib/stdalign.in.h
@@ -1,6 +1,6 @@
/* A substitute for ISO C11 <stdalign.h>.
- Copyright 2011-2014 Free Software Foundation, Inc.
+ Copyright 2011-2016 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
@@ -52,7 +52,10 @@
#undef _Alignas
#undef _Alignof
-#if !defined __STDC_VERSION__ || __STDC_VERSION__ < 201112
+/* GCC releases before GCC 4.9 had a bug in _Alignof. See GCC bug 52023
+ <http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52023>. */
+#if (!defined __STDC_VERSION__ || __STDC_VERSION__ < 201112 \
+ || (defined __GNUC__ && __GNUC__ < 4 + (__GNUC_MINOR__ < 9)))
# ifdef __cplusplus
# if 201103 <= __cplusplus
# define _Alignof(type) alignof (type)
@@ -64,7 +67,9 @@
# 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
@@ -95,15 +100,21 @@
#if !defined __STDC_VERSION__ || __STDC_VERSION__ < 201112
# if defined __cplusplus && 201103 <= __cplusplus
# define _Alignas(a) alignas (a)
-# elif (__GNUC__ || __HP_cc || __HP_aCC || __IBMC__ || __IBMCPP__ \
- || __ICC || 0x5110 <= __SUNPRO_C)
+# elif ((defined __APPLE__ && defined __MACH__ \
+ ? 4 < __GNUC__ + (1 <= __GNUC_MINOR__) \
+ : __GNUC__) \
+ || 061200 <= __HP_cc || 061200 <= __HP_aCC \
+ || __ICC || 0x590 <= __SUNPRO_C || 0x0600 <= __xlC__)
# define _Alignas(a) __attribute__ ((__aligned__ (a)))
# elif 1300 <= _MSC_VER
# 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