Merge from gnulib

This incorporates:
2013-03-29 stdalign: port to stricter ISO C11
This helps to run 'configure' on MS-Windows; see Eli Zaretskii in
<http://lists.gnu.org/archive/html/emacs-devel/2013-03/msg00999.html>.

2 files changed, 10 insertions, 2 deletions

diff --git a/ChangeLog b/ChangeLog
index 2426565a66f..2ddcd03bfcb 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+2013-03-30  Paul Eggert  <eggert@cs.ucla.edu>
+
+        Merge from gnulib, incorporating:
+        2013-03-29 stdalign: port to stricter ISO C11
+        This helps to run 'configure' on MS-Windows; see Eli Zaretskii in
+        <http://lists.gnu.org/archive/html/emacs-devel/2013-03/msg00999.html>.
+
 2013-03-27  Paul Eggert  <eggert@cs.ucla.edu>
 
         * configure.ac (HAVE_XKBGETKEYBOARD): Remove.
diff --git a/m4/stdalign.m4 b/m4/stdalign.m4
index 3d7993dbec8..a866ff670b1 100644
--- a/m4/stdalign.m4
+++ b/m4/stdalign.m4
@@ -33,8 +33,9 @@ AC_DEFUN([gl_STDALIGN_H],
             #if \
                 (__GNUC__ || __IBMC__ || __IBMCPP__ \
                  || 0x5110 <= __SUNPRO_C || 1300 <= _MSC_VER)
-              int alignas (8) alignas_int = 1;
-              char test_alignas[_Alignof (alignas_int) == 8 ? 1 : -1];
+              struct alignas_test { char c; char alignas (8) alignas_8; };
+              char test_alignas[offsetof (struct alignas_test, alignas_8) == 8
+                                ? 1 : -1];
             #endif
           ]])],
        [gl_cv_header_working_stdalign_h=yes],