Updated gnulib.

22 files changed, 216 insertions, 45 deletions

diff --git a/libextra/gl/gnulib.mk b/libextra/gl/gnulib.mk
index 1dee17723e..98d92898d2 100644
--- a/libextra/gl/gnulib.mk
+++ b/libextra/gl/gnulib.mk
@@ -1,6 +1,6 @@
 ## DO NOT EDIT! GENERATED AUTOMATICALLY!
 ## Process this file with automake to produce Makefile.in.
-# Copyright (C) 2002-2011 Free Software Foundation, Inc.
+# Copyright (C) 2002-2012 Free Software Foundation, Inc.
 #
 # This file is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -66,6 +66,29 @@ EXTRA_DIST += memxor.h
 
 ## end   gnulib module memxor
 
+## begin gnulib module stdalign
+
+BUILT_SOURCES += $(STDALIGN_H)
+
+# We need the following in order to create <stdalign.h> when the system
+# doesn't have one that works.
+if GL_GENERATE_STDALIGN_H
+stdalign.h: stdalign.in.h $(top_builddir)/config.status
+	$(AM_V_GEN)rm -f $@-t $@ && \
+	{ echo '/* DO NOT EDIT! GENERATED AUTOMATICALLY! */'; \
+	  cat $(srcdir)/stdalign.in.h; \
+	} > $@-t && \
+	mv $@-t $@
+else
+stdalign.h: $(top_builddir)/config.status
+	rm -f $@
+endif
+MOSTLYCLEANFILES += stdalign.h stdalign.h-t
+
+EXTRA_DIST += stdalign.in.h
+
+## end   gnulib module stdalign
+
 
 mostlyclean-local: mostlyclean-generic
 	@for dir in '' $(MOSTLYCLEANDIRS); do \
diff --git a/libextra/gl/hmac-md5.c b/libextra/gl/hmac-md5.c
index eed16573ba..eb05b1995d 100644
--- a/libextra/gl/hmac-md5.c
+++ b/libextra/gl/hmac-md5.c
@@ -1,5 +1,5 @@
 /* hmac-md5.c -- hashed message authentication codes
-   Copyright (C) 2005-2006, 2009-2011 Free Software Foundation, Inc.
+   Copyright (C) 2005-2006, 2009-2012 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
@@ -12,8 +12,7 @@
    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 Simon Josefsson.  */
 
diff --git a/libextra/gl/hmac.h b/libextra/gl/hmac.h
index 67cb72e7e4..4bb0a74b90 100644
--- a/libextra/gl/hmac.h
+++ b/libextra/gl/hmac.h
@@ -1,5 +1,5 @@
 /* hmac.h -- hashed message authentication codes
-   Copyright (C) 2005, 2009-2011 Free Software Foundation, Inc.
+   Copyright (C) 2005, 2009-2012 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
@@ -12,8 +12,7 @@
    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 Simon Josefsson.  */
 
diff --git a/libextra/gl/m4/00gnulib.m4 b/libextra/gl/m4/00gnulib.m4
index 7feed46694..d978cb898c 100644
--- a/libextra/gl/m4/00gnulib.m4
+++ b/libextra/gl/m4/00gnulib.m4
@@ -1,5 +1,5 @@
 # 00gnulib.m4 serial 2
-dnl Copyright (C) 2009-2011 Free Software Foundation, Inc.
+dnl Copyright (C) 2009-2012 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/libextra/gl/m4/extensions.m4 b/libextra/gl/m4/extensions.m4
index 22156e068c..0bfaef6f90 100644
--- a/libextra/gl/m4/extensions.m4
+++ b/libextra/gl/m4/extensions.m4
@@ -1,7 +1,7 @@
-# serial 10  -*- Autoconf -*-
+# serial 11  -*- Autoconf -*-
 # Enable extensions on systems that normally disable them.
 
-# Copyright (C) 2003, 2006-2011 Free Software Foundation, Inc.
+# Copyright (C) 2003, 2006-2012 Free Software Foundation, Inc.
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
 # with or without modifications, as long as this notice is preserved.
@@ -43,7 +43,7 @@ AC_BEFORE([$0], [AC_RUN_IFELSE])dnl
   AC_CHECK_HEADER([minix/config.h], [MINIX=yes], [MINIX=])
   if test "$MINIX" = yes; then
     AC_DEFINE([_POSIX_SOURCE], [1],
-      [Define to 1 if you need to in order for `stat' and other
+      [Define to 1 if you need to in order for 'stat' and other
        things to work.])
     AC_DEFINE([_POSIX_1_SOURCE], [2],
       [Define to 2 if the system does not provide POSIX.1 features
diff --git a/libextra/gl/m4/gnulib-cache.m4 b/libextra/gl/m4/gnulib-cache.m4
index 261dfdfbfc..bad68b01f9 100644
--- a/libextra/gl/m4/gnulib-cache.m4
+++ b/libextra/gl/m4/gnulib-cache.m4
@@ -1,4 +1,4 @@
-# Copyright (C) 2002-2011 Free Software Foundation, Inc.
+# Copyright (C) 2002-2012 Free Software Foundation, Inc.
 #
 # This file is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/libextra/gl/m4/gnulib-common.m4 b/libextra/gl/m4/gnulib-common.m4
index 7d83299959..ae4d25483c 100644
--- a/libextra/gl/m4/gnulib-common.m4
+++ b/libextra/gl/m4/gnulib-common.m4
@@ -1,5 +1,5 @@
-# gnulib-common.m4 serial 31
-dnl Copyright (C) 2007-2011 Free Software Foundation, Inc.
+# gnulib-common.m4 serial 32
+dnl Copyright (C) 2007-2012 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
@@ -13,12 +13,12 @@ AC_DEFUN([gl_COMMON], [
 ])
 AC_DEFUN([gl_COMMON_BODY], [
   AH_VERBATIM([_Noreturn],
-[/* The _Noreturn keyword of draft C1X.  */
+[/* The _Noreturn keyword of C11.  */
 #ifndef _Noreturn
 # if (3 <= __GNUC__ || (__GNUC__ == 2 && 8 <= __GNUC_MINOR__) \
       || 0x5110 <= __SUNPRO_C)
 #  define _Noreturn __attribute__ ((__noreturn__))
-# elif 1200 <= _MSC_VER
+# elif defined _MSC_VER && 1200 <= _MSC_VER
 #  define _Noreturn __declspec (noreturn)
 # else
 #  define _Noreturn
@@ -224,7 +224,7 @@ m4_ifndef([AS_VAR_IF],
 # - When AC_PROG_CC_STDC is invoked twice, it adds the C99 enabling options
 #   to CC twice
 #   <http://lists.gnu.org/archive/html/bug-gnulib/2011-09/msg00431.html>.
-# - AC_PROG_CC_STDC is likely to change when C1X is an ISO standard.
+# - AC_PROG_CC_STDC is likely to change now that C11 is an ISO standard.
 AC_DEFUN([gl_PROG_CC_C99],
 [
   dnl Change that version number to the minimum Autoconf version that supports
diff --git a/libextra/gl/m4/gnulib-comp.m4 b/libextra/gl/m4/gnulib-comp.m4
index 707948ed9d..d8ea91acd0 100644
--- a/libextra/gl/m4/gnulib-comp.m4
+++ b/libextra/gl/m4/gnulib-comp.m4
@@ -1,5 +1,5 @@
 # DO NOT EDIT! GENERATED AUTOMATICALLY!
-# Copyright (C) 2002-2011 Free Software Foundation, Inc.
+# Copyright (C) 2002-2012 Free Software Foundation, Inc.
 #
 # This file is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -46,6 +46,7 @@ AC_DEFUN([xgl_EARLY],
   # Code from module lib-msvc-compat:
   # Code from module lib-symbol-versions:
   # Code from module memxor:
+  # Code from module stdalign:
 ])
 
 # This macro should be invoked from ./configure.ac, in the section
@@ -66,6 +67,7 @@ gl_MD5
 gl_LD_OUTPUT_DEF
 gl_LD_VERSION_SCRIPT
 gl_MEMXOR
+gl_STDALIGN_H
   # End of code from modules
   m4_ifval(xgl_LIBSOURCES_LIST, [
     m4_syscmd([test ! -d ]m4_defn([xgl_LIBSOURCES_DIR])[ ||
@@ -209,6 +211,7 @@ AC_DEFUN([xgl_FILE_LIST], [
   lib/md5.h
   lib/memxor.c
   lib/memxor.h
+  lib/stdalign.in.h
   m4/00gnulib.m4
   m4/extensions.m4
   m4/gnulib-common.m4
@@ -219,4 +222,5 @@ AC_DEFUN([xgl_FILE_LIST], [
   m4/lib-prefix.m4
   m4/md5.m4
   m4/memxor.m4
+  m4/stdalign.m4
 ])
diff --git a/libextra/gl/m4/gnulib-tool.m4 b/libextra/gl/m4/gnulib-tool.m4
index ed41e9d415..a09ffc1d1a 100644
--- a/libextra/gl/m4/gnulib-tool.m4
+++ b/libextra/gl/m4/gnulib-tool.m4
@@ -1,5 +1,5 @@
 # gnulib-tool.m4 serial 2
-dnl Copyright (C) 2004-2005, 2009-2011 Free Software Foundation, Inc.
+dnl Copyright (C) 2004-2005, 2009-2012 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/libextra/gl/m4/ld-output-def.m4 b/libextra/gl/m4/ld-output-def.m4
index 2169f51510..35116843b0 100644
--- a/libextra/gl/m4/ld-output-def.m4
+++ b/libextra/gl/m4/ld-output-def.m4
@@ -1,5 +1,5 @@
 # ld-output-def.m4 serial 2
-dnl Copyright (C) 2008-2011 Free Software Foundation, Inc.
+dnl Copyright (C) 2008-2012 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/libextra/gl/m4/ld-version-script.m4 b/libextra/gl/m4/ld-version-script.m4
index aec2f41c1e..5ed93efdbb 100644
--- a/libextra/gl/m4/ld-version-script.m4
+++ b/libextra/gl/m4/ld-version-script.m4
@@ -1,5 +1,5 @@
-# ld-version-script.m4 serial 2
-dnl Copyright (C) 2008-2011 Free Software Foundation, Inc.
+# ld-version-script.m4 serial 3
+dnl Copyright (C) 2008-2012 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
@@ -26,6 +26,12 @@ AC_DEFUN([gl_LD_VERSION_SCRIPT],
     save_LDFLAGS="$LDFLAGS"
     LDFLAGS="$LDFLAGS -Wl,--version-script=conftest.map"
     cat > conftest.map <<EOF
+foo
+EOF
+    AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])],
+                   [accepts_syntax_errors=yes], [accepts_syntax_errors=no])
+    if test "$accepts_syntax_errors" = no; then
+      cat > conftest.map <<EOF
 VERS_1 {
         global: sym;
 };
@@ -34,8 +40,11 @@ VERS_2 {
         global: sym;
 } VERS_1;
 EOF
-    AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])],
-                   [have_ld_version_script=yes], [have_ld_version_script=no])
+      AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])],
+                     [have_ld_version_script=yes], [have_ld_version_script=no])
+    else
+      have_ld_version_script=no
+    fi
     rm -f conftest.map
     LDFLAGS="$save_LDFLAGS"
     AC_MSG_RESULT($have_ld_version_script)
diff --git a/libextra/gl/m4/lib-ld.m4 b/libextra/gl/m4/lib-ld.m4
index ae003f7c59..4e1374d9bc 100644
--- a/libextra/gl/m4/lib-ld.m4
+++ b/libextra/gl/m4/lib-ld.m4
@@ -1,5 +1,5 @@
 # lib-ld.m4 serial 5 (gettext-0.18.2)
-dnl Copyright (C) 1996-2003, 2009-2011 Free Software Foundation, Inc.
+dnl Copyright (C) 1996-2003, 2009-2012 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/libextra/gl/m4/lib-link.m4 b/libextra/gl/m4/lib-link.m4
index e7c9ba9d3d..d11b4b4350 100644
--- a/libextra/gl/m4/lib-link.m4
+++ b/libextra/gl/m4/lib-link.m4
@@ -1,5 +1,5 @@
 # lib-link.m4 serial 26 (gettext-0.18.2)
-dnl Copyright (C) 2001-2011 Free Software Foundation, Inc.
+dnl Copyright (C) 2001-2012 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/libextra/gl/m4/lib-prefix.m4 b/libextra/gl/m4/lib-prefix.m4
index 7e5f0bde03..007aa0532e 100644
--- a/libextra/gl/m4/lib-prefix.m4
+++ b/libextra/gl/m4/lib-prefix.m4
@@ -1,5 +1,5 @@
 # lib-prefix.m4 serial 7 (gettext-0.18)
-dnl Copyright (C) 2001-2005, 2008-2011 Free Software Foundation, Inc.
+dnl Copyright (C) 2001-2005, 2008-2012 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/libextra/gl/m4/md5.m4 b/libextra/gl/m4/md5.m4
index 4b41a85b35..e22f7bdb17 100644
--- a/libextra/gl/m4/md5.m4
+++ b/libextra/gl/m4/md5.m4
@@ -1,5 +1,5 @@
 # md5.m4 serial 12
-dnl Copyright (C) 2002-2006, 2008-2011 Free Software Foundation, Inc.
+dnl Copyright (C) 2002-2006, 2008-2012 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/libextra/gl/m4/memxor.m4 b/libextra/gl/m4/memxor.m4
index 10c3313e85..ba68d50df9 100644
--- a/libextra/gl/m4/memxor.m4
+++ b/libextra/gl/m4/memxor.m4
@@ -1,5 +1,5 @@
 # memxor.m4 serial 4
-dnl Copyright (C) 2006, 2009-2011 Free Software Foundation, Inc.
+dnl Copyright (C) 2006, 2009-2012 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
diff --git a/libextra/gl/m4/stdalign.m4 b/libextra/gl/m4/stdalign.m4
new file mode 100644
index 0000000000..6659c9c3ec
--- /dev/null
+++ b/libextra/gl/m4/stdalign.m4
@@ -0,0 +1,51 @@
+# Check for stdalign.h that conforms to C11.
+
+dnl Copyright 2011-2012 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+# Prepare for substituting <stdalign.h> if it is not supported.
+
+AC_DEFUN([gl_STDALIGN_H],
+[
+  AC_CACHE_CHECK([for working stdalign.h],
+    [gl_cv_header_working_stdalign_h],
+    [AC_COMPILE_IFELSE(
+       [AC_LANG_PROGRAM(
+          [[#include <stdalign.h>
+            #include <stddef.h>
+
+            /* Test that alignof yields a result consistent with offsetof.
+               This catches GCC bug 52023
+               <http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52023>.  */
+            #ifdef __cplusplus
+               template <class t> struct alignof_helper { char a; t b; };
+            # define ao(type) offsetof (alignof_helper<type>, b)
+            #else
+            # define ao(type) offsetof (struct { char a; type b; }, b)
+            #endif
+            char test_double[ao (double) % _Alignof (double) == 0 ? 1 : -1];
+            char test_long[ao (long int) % _Alignof (long int) == 0 ? 1 : -1];
+            char test_alignof[alignof (double) == _Alignof (double) ? 1 : -1];
+
+            /* Test _Alignas only on platforms where gnulib can help.  */
+            #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];
+            #endif
+          ]])],
+       [gl_cv_header_working_stdalign_h=yes],
+       [gl_cv_header_working_stdalign_h=no])])
+
+  if test $gl_cv_header_working_stdalign_h = yes; then
+    STDALIGN_H=''
+  else
+    STDALIGN_H='stdalign.h'
+  fi
+
+  AC_SUBST([STDALIGN_H])
+  AM_CONDITIONAL([GL_GENERATE_STDALIGN_H], [test -n "$STDALIGN_H"])
+])
diff --git a/libextra/gl/md5.c b/libextra/gl/md5.c
index a4933953c7..0747e9b5ea 100644
--- a/libextra/gl/md5.c
+++ b/libextra/gl/md5.c
@@ -1,6 +1,6 @@
 /* Functions to compute MD5 message digest of files or memory blocks.
    according to the definition of MD5 in RFC 1321 from April 1992.
-   Copyright (C) 1995-1997, 1999-2001, 2005-2006, 2008-2011 Free Software
+   Copyright (C) 1995-1997, 1999-2001, 2005-2006, 2008-2012 Free Software
    Foundation, Inc.
    This file is part of the GNU C Library.
 
@@ -15,8 +15,7 @@
    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 Ulrich Drepper <drepper@gnu.ai.mit.edu>, 1995.  */
 
@@ -24,7 +23,8 @@
 
 #include "md5.h"
 
-#include <stddef.h>
+#include <stdalign.h>
+#include <stdint.h>
 #include <stdlib.h>
 #include <string.h>
 #include <sys/types.h>
@@ -257,8 +257,7 @@ md5_process_bytes (const void *buffer, size_t len, struct md5_ctx *ctx)
   if (len >= 64)
     {
 #if !_STRING_ARCH_unaligned
-# define alignof(type) offsetof (struct { char c; type x; }, x)
-# define UNALIGNED_P(p) (((size_t) p) % alignof (uint32_t) != 0)
+# define UNALIGNED_P(p) ((uintptr_t) (p) % alignof (uint32_t) != 0)
       if (UNALIGNED_P (buffer))
         while (len > 64)
           {
diff --git a/libextra/gl/md5.h b/libextra/gl/md5.h
index 53e6048029..75d6bce5c3 100644
--- a/libextra/gl/md5.h
+++ b/libextra/gl/md5.h
@@ -1,6 +1,6 @@
 /* Declaration of functions and data types used for MD5 sum computing
    library functions.
-   Copyright (C) 1995-1997, 1999-2001, 2004-2006, 2008-2011 Free Software
+   Copyright (C) 1995-1997, 1999-2001, 2004-2006, 2008-2012 Free Software
    Foundation, Inc.
    This file is part of the GNU C Library.
 
@@ -15,8 +15,7 @@
    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/>.  */
 
 #ifndef _MD5_H
 #define _MD5_H 1
@@ -73,7 +72,7 @@ struct md5_ctx
 
 /*
  * The following three functions are build up the low level used in
- * the functions `md5_stream' and `md5_buffer'.
+ * the functions 'md5_stream' and 'md5_buffer'.
  */
 
 /* Initialize structure containing state of computation.
diff --git a/libextra/gl/memxor.c b/libextra/gl/memxor.c
index 4eeebcbd56..8e1ab36de5 100644
--- a/libextra/gl/memxor.c
+++ b/libextra/gl/memxor.c
@@ -1,5 +1,5 @@
 /* memxor.c -- perform binary exclusive OR operation of two memory blocks.
-   Copyright (C) 2005-2006, 2009-2011 Free Software Foundation, Inc.
+   Copyright (C) 2005-2006, 2009-2012 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
@@ -12,8 +12,7 @@
    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 Simon Josefsson.  The interface was inspired by memxor
    in Niels Möller's Nettle. */
diff --git a/libextra/gl/memxor.h b/libextra/gl/memxor.h
index dafa2cfca7..731ac36784 100644
--- a/libextra/gl/memxor.h
+++ b/libextra/gl/memxor.h
@@ -1,5 +1,5 @@
 /* memxor.h -- perform binary exclusive OR operation on memory blocks.
-   Copyright (C) 2005, 2009-2011 Free Software Foundation, Inc.
+   Copyright (C) 2005, 2009-2012 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
@@ -12,8 +12,7 @@
    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 Simon Josefsson.  The interface was inspired by memxor
    in Niels Möller's Nettle. */
diff --git a/libextra/gl/stdalign.in.h b/libextra/gl/stdalign.in.h
new file mode 100644
index 0000000000..8fba6943f6
--- /dev/null
+++ b/libextra/gl/stdalign.in.h
@@ -0,0 +1,90 @@
+/* A substitute for ISO C11 <stdalign.h>.
+
+   Copyright 2011-2012 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
+   the Free Software Foundation; either version 3, or (at your option)
+   any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   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, see <http://www.gnu.org/licenses/>.  */
+
+/* Written by Paul Eggert and Bruno Haible.  */
+
+#ifndef _GL_STDALIGN_H
+#define _GL_STDALIGN_H
+
+/* ISO C11 <stdalign.h> for platforms that lack it.
+
+   References:
+   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++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
+   requirement of a structure member (i.e., slot or field) that is of
+   type TYPE, as an integer constant expression.
+
+   This differs from GCC's __alignof__ operator, which can yield a
+   better-performing alignment for an object of that type.  For
+   example, on x86 with GCC, __alignof__ (double) and __alignof__
+   (long long) are 8, whereas alignof (double) and alignof (long long)
+   are 4 unless the option '-malign-double' is used.
+
+   The result cannot be used as a value for an 'enum' constant, if you
+   want to be portable to HP-UX 10.20 cc and AIX 3.2.5 xlc.  */
+#include <stddef.h>
+#if defined __cplusplus
+   template <class __t> struct __alignof_helper { char __a; __t __b; };
+# define _Alignof(type) offsetof (__alignof_helper<type>, __b)
+#else
+# define _Alignof(type) offsetof (struct { char __a; type __b; }, __b)
+#endif
+#define alignof _Alignof
+#define __alignof_is_defined 1
+
+/* alignas (A), also known as _Alignas (A), aligns a variable or type
+   to the alignment A, where A is an integer constant expression.  For
+   example:
+
+      int alignas (8) foo;
+      struct s { int a; int alignas (8) bar; };
+
+   aligns the address of FOO and the offset of BAR to be multiples of 8.
+
+   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.  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 C11 requirements are not supported here:
+
+     - If A is zero, alignas has no effect.
+     - alignas can be used multiple times; the strictest one wins.
+     - alignas (TYPE) is equivalent to alignas (alignof (TYPE)).
+
+   */
+
+#if __GNUC__ || __IBMC__ || __IBMCPP__ || 0x5110 <= __SUNPRO_C
+# define _Alignas(a) __attribute__ ((__aligned__ (a)))
+#elif 1300 <= _MSC_VER
+# define _Alignas(a) __declspec (align (a))
+#endif
+#ifdef _Alignas
+# define alignas _Alignas
+# define __alignas_is_defined 1
+#endif
+
+#endif /* _GL_STDALIGN_H */