execute: Revert last change, but use a different condition.

[gnulib.git] / lib / stdalign.in.h

diff --git a/lib/stdalign.in.h b/lib/stdalign.in.h
index 8e64a2a..93d7da3 100644 (file)
--- a/lib/stdalign.in.h
+++ b/lib/stdalign.in.h
@@ -1,6 +1,6 @@
-/* A substitute for ISO C 1x <stdalign.h>.
+/* A substitute for ISO C11 <stdalign.h>.
 
-   Copyright 2011 Free Software Foundation, Inc.
+   Copyright 2011-2013 Free Software Foundation, Inc.
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -13,20 +13,21 @@
    GNU General Public License for more details.
 
    You should have received a copy of the GNU General Public License
-   along with this program; if not, write to the Free Software Foundation,
-   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
+   along with this program; if not, see <http://www.gnu.org/licenses/>.  */
 
 /* Written by Paul Eggert and Bruno Haible.  */
 
 #ifndef _GL_STDALIGN_H
 #define _GL_STDALIGN_H
 
-/* ISO C1X <stdalign.h> for platforms that lack it.
+/* ISO C11 <stdalign.h> for platforms that lack it.
 
    References:
-   ISO C1X <http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1570.pdf>
+   ISO C11 (latest free draft
+   <http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1570.pdf>)
    sections 6.5.3.4, 6.7.5, 7.15.
-   C++0X <http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2011/n3242.pdf>
+   C++11 (latest free draft
+   <http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2011/n3242.pdf>)
    section 18.10. */
 
 /* alignof (TYPE), also known as _Alignof (TYPE), yields the alignment
@@ -62,9 +63,13 @@
 
    A should be a power of two that is at least the type's alignment
    and at most the implementation's alignment limit.  This limit is
-   2**28 on typical GNUish hosts, and 2**13 on MSVC.
+   2**28 on typical GNUish hosts, and 2**13 on MSVC.  To be portable
+   to MSVC through at least version 10.0, A should be an integer
+   constant, as MSVC does not support expressions such as 1 << 3.
+   To be portable to Sun C 5.11, do not align auto variables to
+   anything stricter than their default alignment.
 
-   The following draft C1X requirements are not supported here:
+   The following C11 requirements are not supported here:
 
      - If A is zero, alignas has no effect.
      - alignas can be used multiple times; the strictest one wins.
@@ -75,7 +80,7 @@
 #if __GNUC__ || __IBMC__ || __IBMCPP__ || 0x5110 <= __SUNPRO_C
 # define _Alignas(a) __attribute__ ((__aligned__ (a)))
 #elif 1300 <= _MSC_VER
-# define _Alignas(a) __declspec ((align (a)))
+# define _Alignas(a) __declspec (align (a))
 #endif
 #ifdef _Alignas
 # define alignas _Alignas