[patch] findutils-4.5.11-unlinkat.patch

findutils-4.5.11-unlinkat.patch (text/plain), 45.38 KB, created by Martin von Gagern on 2013-05-28 18:58:42 UTC

Include unlinkat in the gnulib include list.

Difference from findutils 4.5.11 tarball to findutils based on
findutils git 6b240251d5e8e1da4c6057b1c2eac1aca3012d70
gnulib git    fd9f1acededd74f8cd095e657528aa8fad183536
with unlinkat added to the list of gnulib modules to import.
Files like .gitignore were omitted, as was the removal of
parse-datetime.c and the automatically generated Makefile.in files.

2013-05-28 Martin von Gagern

References:
https://bugs.gentoo.org/show_bug.cgi?id=469206
https://savannah.gnu.org/bugs/index.php?38963

--- a/import-gnulib.config
+++ b/import-gnulib.config
@@ -139,6 +139,7 @@
 sys_wait
 timespec
 uname
+unlinkat
 verify
 version-etc
 version-etc-fsf
--- a/gl/lib/Makefile.am
+++ b/gl/lib/Makefile.am
@@ -21,7 +21,7 @@
 # the same distribution terms as the rest of that program.
 #
 # Generated by gnulib-tool.
-# Reproduce by: gnulib-tool --import --dir=. --local-dir=gnulib-local --lib=libgnulib --source-base=gl/lib --m4-base=gl/m4 --doc-base=doc --tests-base=tests --aux-dir=build-aux --with-tests --no-conditional-dependencies --no-libtool --macro-prefix=gl alloca areadlinkat argmatch assert byteswap c-strcasestr c-strstr canonicalize cloexec closein closeout ctype d-ino d-type dirent-safer dirname errno error faccessat fchdir fcntl fdl fdopendir fflush fileblocks filemode fnmatch-gnu fopen-safer fts getdelim getline getopt-gnu gettext gettimeofday gpl-3.0 hash human idcache inline inttypes isblank locale lstat maintainer-makefile malloc manywarnings math mbrtowc mbscasestr mbsstr mktime modechange modf mountlist open parse-datetime pathmax perror progname quotearg readlink realloc regex rpmatch save-cwd savedir selinux-at snprintf stat stat-macros stat-size stat-time stdarg stdbool stddef stdint stdio stdlib stpcpy strcasestr strdup-posix strftime string strndup strtol strtoul strtoull strtoumax sys_stat sys_time sys_wait timespec uname update-copyright verify version-etc version-etc-fsf warnings wchar wcwidth xalloc xalloc-die xgetcwd xstrtod xstrtol xstrtoumax yesno
+# Reproduce by: gnulib-tool --import --dir=. --local-dir=gnulib-local --lib=libgnulib --source-base=gl/lib --m4-base=gl/m4 --doc-base=doc --tests-base=tests --aux-dir=build-aux --with-tests --no-conditional-dependencies --no-libtool --macro-prefix=gl alloca areadlinkat argmatch assert byteswap c-strcasestr c-strstr canonicalize cloexec closein closeout ctype d-ino d-type dirent-safer dirname errno error faccessat fchdir fcntl fdl fdopendir fflush fileblocks filemode fnmatch-gnu fopen-safer fts getdelim getline getopt-gnu gettext gettimeofday gpl-3.0 hash human idcache inline inttypes isblank locale lstat maintainer-makefile malloc manywarnings math mbrtowc mbscasestr mbsstr mktime modechange modf mountlist open parse-datetime pathmax perror progname quotearg readlink realloc regex rpmatch save-cwd savedir selinux-at snprintf stat stat-macros stat-size stat-time stdarg stdbool stddef stdint stdio stdlib stpcpy strcasestr strdup-posix strftime string strndup strtol strtoul strtoull strtoumax sys_stat sys_time sys_wait timespec uname unlinkat update-copyright verify version-etc version-etc-fsf warnings wchar wcwidth xalloc xalloc-die xgetcwd xstrtod xstrtol xstrtoumax yesno
 
 AUTOMAKE_OPTIONS = 1.5 gnits subdir-objects
 
@@ -1977,6 +1977,15 @@
 
 ## end   gnulib module rewinddir
 
+## begin gnulib module rmdir
+
+
+EXTRA_DIST += rmdir.c
+
+EXTRA_libgnulib_a_SOURCES += rmdir.c
+
+## end   gnulib module rmdir
+
 ## begin gnulib module root-uid
 
 
@@ -3450,6 +3459,24 @@
 
 ## end   gnulib module uniwidth/width
 
+## begin gnulib module unlink
+
+
+EXTRA_DIST += unlink.c
+
+EXTRA_libgnulib_a_SOURCES += unlink.c
+
+## end   gnulib module unlink
+
+## begin gnulib module unlinkat
+
+
+EXTRA_DIST += at-func.c unlinkat.c
+
+EXTRA_libgnulib_a_SOURCES += at-func.c unlinkat.c
+
+## end   gnulib module unlinkat
+
 ## begin gnulib module unsetenv
 
 
--- a/gl/lib/rmdir.c
+++ b/gl/lib/rmdir.c
@@ -0,0 +1,53 @@
+/* Work around rmdir bugs.
+
+   Copyright (C) 1988, 1990, 1999, 2003-2006, 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
+   the Free Software Foundation; either version 3 of the License, 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/>.  */
+
+#include <config.h>
+
+#include <unistd.h>
+
+#include <errno.h>
+#include <string.h>
+
+#include "dosname.h"
+
+#undef rmdir
+
+/* Remove directory DIR.
+   Return 0 if successful, -1 if not.  */
+
+int
+rpl_rmdir (char const *dir)
+{
+  /* Work around cygwin 1.5.x bug where rmdir("dir/./") succeeds.  */
+  size_t len = strlen (dir);
+  int result;
+  while (len && ISSLASH (dir[len - 1]))
+    len--;
+  if (len && dir[len - 1] == '.' && (1 == len || ISSLASH (dir[len - 2])))
+    {
+      errno = EINVAL;
+      return -1;
+    }
+  result = rmdir (dir);
+  /* Work around mingw bug, where rmdir("file/") fails with EINVAL
+     instead of ENOTDIR.  We've already filtered out trailing ., the
+     only reason allowed by POSIX for EINVAL.  */
+  if (result == -1 && errno == EINVAL)
+    errno = ENOTDIR;
+  return result;
+}
--- a/gl/lib/unlinkat.c
+++ b/gl/lib/unlinkat.c
@@ -0,0 +1,109 @@
+/* Work around unlinkat bugs on Solaris 9 and Hurd.
+
+   Copyright (C) 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
+   the Free Software Foundation; either version 3 of the License, 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 Eric Blake.  */
+
+#include <config.h>
+
+#include <unistd.h>
+
+#include <errno.h>
+#include <fcntl.h>
+#include <string.h>
+#include <sys/stat.h>
+
+#include <stdlib.h>
+
+#include "dosname.h"
+#include "openat.h"
+
+#if HAVE_UNLINKAT
+
+# undef unlinkat
+
+/* unlinkat without AT_REMOVEDIR does not honor trailing / on Solaris
+   9.  Solve it in a similar manner to unlink.  Hurd has the same
+   issue. */
+
+int
+rpl_unlinkat (int fd, char const *name, int flag)
+{
+  size_t len;
+  int result = 0;
+  /* rmdir behavior has no problems with trailing slash.  */
+  if (flag & AT_REMOVEDIR)
+    return unlinkat (fd, name, flag);
+
+  len = strlen (name);
+  if (len && ISSLASH (name[len - 1]))
+    {
+      /* See the lengthy comment in unlink.c why we disobey the POSIX
+         rule of letting unlink("link-to-dir/") attempt to unlink a
+         directory.  */
+      struct stat st;
+      result = lstatat (fd, name, &st);
+      if (result == 0)
+        {
+          /* Trailing NUL will overwrite the trailing slash.  */
+          char *short_name = malloc (len);
+          if (!short_name)
+            {
+              errno = EPERM;
+              return -1;
+            }
+          memcpy (short_name, name, len);
+          while (len && ISSLASH (short_name[len - 1]))
+            short_name[--len] = '\0';
+          if (len && (lstatat (fd, short_name, &st) || S_ISLNK (st.st_mode)))
+            {
+              free (short_name);
+              errno = EPERM;
+              return -1;
+            }
+          free (short_name);
+        }
+    }
+  if (!result)
+    result = unlinkat (fd, name, flag);
+  return result;
+}
+
+#else /* !HAVE_UNLINKAT */
+
+/* Replacement for Solaris' function by the same name.
+   <http://www.google.com/search?q=unlinkat+site:docs.sun.com>
+   First, try to simulate it via (unlink|rmdir) ("/proc/self/fd/FD/FILE").
+   Failing that, simulate it via save_cwd/fchdir/(unlink|rmdir)/restore_cwd.
+   If either the save_cwd or the restore_cwd fails (relatively unlikely),
+   then give a diagnostic and exit nonzero.
+   Otherwise, this function works just like Solaris' unlinkat.  */
+
+# define AT_FUNC_NAME unlinkat
+# define AT_FUNC_F1 rmdir
+# define AT_FUNC_F2 unlink
+# define AT_FUNC_USE_F1_COND AT_REMOVEDIR
+# define AT_FUNC_POST_FILE_PARAM_DECLS , int flag
+# define AT_FUNC_POST_FILE_ARGS        /* empty */
+# include "at-func.c"
+# undef AT_FUNC_NAME
+# undef AT_FUNC_F1
+# undef AT_FUNC_F2
+# undef AT_FUNC_USE_F1_COND
+# undef AT_FUNC_POST_FILE_PARAM_DECLS
+# undef AT_FUNC_POST_FILE_ARGS
+
+#endif /* !HAVE_UNLINKAT */
--- a/gl/lib/unlink.c
+++ b/gl/lib/unlink.c
@@ -0,0 +1,97 @@
+/* Work around unlink bugs.
+
+   Copyright (C) 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
+   the Free Software Foundation; either version 3 of the License, 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/>.  */
+
+#include <config.h>
+
+#include <unistd.h>
+
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+
+#include "dosname.h"
+
+#undef unlink
+
+/* Remove file NAME.
+   Return 0 if successful, -1 if not.  */
+
+int
+rpl_unlink (char const *name)
+{
+  /* Work around Solaris 9 bug where unlink("file/") succeeds.  */
+  size_t len = strlen (name);
+  int result = 0;
+  if (len && ISSLASH (name[len - 1]))
+    {
+      /* We can't unlink(2) something if it doesn't exist.  If it does
+         exist, then it resolved to a directory, due to the trailing
+         slash, and POSIX requires that the unlink attempt to remove
+         that directory (which would leave the symlink dangling).
+         Unfortunately, Solaris 9 is one of the platforms where the
+         root user can unlink directories, and we don't want to
+         cripple this behavior on real directories, even if it is
+         seldom needed (at any rate, it's nicer to let coreutils'
+         unlink(1) give the correct errno for non-root users).  But we
+         don't know whether name was an actual directory, or a symlink
+         to a directory; and due to the bug of ignoring trailing
+         slash, Solaris 9 would end up successfully unlinking the
+         symlink instead of the directory.  Technically, we could use
+         realpath to find the canonical directory name to attempt
+         deletion on.  But that is a lot of work for a corner case; so
+         we instead just use an lstat on the shortened name, and
+         reject symlinks with trailing slashes.  The root user of
+         unlink(1) will just have to live with the rule that they
+         can't delete a directory via a symlink.  */
+      struct stat st;
+      result = lstat (name, &st);
+      if (result == 0)
+        {
+          /* Trailing NUL will overwrite the trailing slash.  */
+          char *short_name = malloc (len);
+          if (!short_name)
+            {
+              errno = EPERM;
+              return -1;
+            }
+          memcpy (short_name, name, len);
+          while (len && ISSLASH (short_name[len - 1]))
+            short_name[--len] = '\0';
+          if (len && (lstat (short_name, &st) || S_ISLNK (st.st_mode)))
+            {
+              free (short_name);
+              errno = EPERM;
+              return -1;
+            }
+          free (short_name);
+        }
+    }
+  if (!result)
+    {
+#if UNLINK_PARENT_BUG
+      if (len >= 2 && name[len - 1] == '.' && name[len - 2] == '.'
+          && (len == 2 || ISSLASH (name[len - 3])))
+        {
+          errno = EISDIR; /* could also use EPERM */
+          return -1;
+        }
+#endif
+      result = unlink (name);
+    }
+  return result;
+}
--- a/gl/m4/glibc2.m4
+++ b/gl/m4/glibc2.m4
@@ -0,0 +1,31 @@
+# glibc2.m4 serial 3
+dnl Copyright (C) 2000-2002, 2004, 2008, 2010-2012 Free Software Foundation,
+dnl 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.
+
+# Test for the GNU C Library, version 2.0 or newer.
+# From Bruno Haible.
+
+AC_DEFUN([gt_GLIBC2],
+  [
+    AC_CACHE_CHECK([whether we are using the GNU C Library 2 or newer],
+      [ac_cv_gnu_library_2],
+      [AC_EGREP_CPP([Lucky GNU user],
+        [
+#include <features.h>
+#ifdef __GNU_LIBRARY__
+ #if (__GLIBC__ >= 2) && !defined __UCLIBC__
+  Lucky GNU user
+ #endif
+#endif
+        ],
+        [ac_cv_gnu_library_2=yes],
+        [ac_cv_gnu_library_2=no])
+      ]
+    )
+    AC_SUBST([GLIBC2])
+    GLIBC2="$ac_cv_gnu_library_2"
+  ]
+)
--- a/gl/m4/gnulib-cache.m4
+++ b/gl/m4/gnulib-cache.m4
@@ -27,7 +27,7 @@
 
 
 # Specification in the form of a command-line invocation:
-#   gnulib-tool --import --dir=. --local-dir=gnulib-local --lib=libgnulib --source-base=gl/lib --m4-base=gl/m4 --doc-base=doc --tests-base=tests --aux-dir=build-aux --with-tests --no-conditional-dependencies --no-libtool --macro-prefix=gl alloca areadlinkat argmatch assert byteswap c-strcasestr c-strstr canonicalize cloexec closein closeout ctype d-ino d-type dirent-safer dirname errno error faccessat fchdir fcntl fdl fdopendir fflush fileblocks filemode fnmatch-gnu fopen-safer fts getdelim getline getopt-gnu gettext gettimeofday gpl-3.0 hash human idcache inline inttypes isblank locale lstat maintainer-makefile malloc manywarnings math mbrtowc mbscasestr mbsstr mktime modechange modf mountlist open parse-datetime pathmax perror progname quotearg readlink realloc regex rpmatch save-cwd savedir selinux-at snprintf stat stat-macros stat-size stat-time stdarg stdbool stddef stdint stdio stdlib stpcpy strcasestr strdup-posix strftime string strndup strtol strtoul strtoull strtoumax sys_stat sys_time sys_wait timespec uname update-copyright verify version-etc version-etc-fsf warnings wchar wcwidth xalloc xalloc-die xgetcwd xstrtod xstrtol xstrtoumax yesno
+#   gnulib-tool --import --dir=. --local-dir=gnulib-local --lib=libgnulib --source-base=gl/lib --m4-base=gl/m4 --doc-base=doc --tests-base=tests --aux-dir=build-aux --with-tests --no-conditional-dependencies --no-libtool --macro-prefix=gl alloca areadlinkat argmatch assert byteswap c-strcasestr c-strstr canonicalize cloexec closein closeout ctype d-ino d-type dirent-safer dirname errno error faccessat fchdir fcntl fdl fdopendir fflush fileblocks filemode fnmatch-gnu fopen-safer fts getdelim getline getopt-gnu gettext gettimeofday gpl-3.0 hash human idcache inline inttypes isblank locale lstat maintainer-makefile malloc manywarnings math mbrtowc mbscasestr mbsstr mktime modechange modf mountlist open parse-datetime pathmax perror progname quotearg readlink realloc regex rpmatch save-cwd savedir selinux-at snprintf stat stat-macros stat-size stat-time stdarg stdbool stddef stdint stdio stdlib stpcpy strcasestr strdup-posix strftime string strndup strtol strtoul strtoull strtoumax sys_stat sys_time sys_wait timespec uname unlinkat update-copyright verify version-etc version-etc-fsf warnings wchar wcwidth xalloc xalloc-die xgetcwd xstrtod xstrtol xstrtoumax yesno
 
 # Specification in the form of a few gnulib-tool.m4 macro invocations:
 gl_LOCAL_DIR([gnulib-local])
@@ -125,6 +125,7 @@
   sys_wait
   timespec
   uname
+  unlinkat
   update-copyright
   verify
   version-etc
--- a/gl/m4/gnulib-comp.m4
+++ b/gl/m4/gnulib-comp.m4
@@ -1045,6 +1045,11 @@
     AC_LIBOBJ([rewinddir])
   fi
   gl_DIRENT_MODULE_INDICATOR([rewinddir])
+  gl_FUNC_RMDIR
+  if test $REPLACE_RMDIR = 1; then
+    AC_LIBOBJ([rmdir])
+  fi
+  gl_UNISTD_MODULE_INDICATOR([rmdir])
   gl_FUNC_RPMATCH
   if test $HAVE_RPMATCH = 0; then
     AC_LIBOBJ([rpmatch])
@@ -1223,6 +1228,16 @@
   gl_LIBUNISTRING_LIBHEADER([0.9], [unitypes.h])
   gl_LIBUNISTRING_LIBHEADER([0.9], [uniwidth.h])
   gl_LIBUNISTRING_MODULE([0.9.4], [uniwidth/width])
+  gl_FUNC_UNLINK
+  if test $REPLACE_UNLINK = 1; then
+    AC_LIBOBJ([unlink])
+  fi
+  gl_UNISTD_MODULE_INDICATOR([unlink])
+  gl_FUNC_UNLINKAT
+  if test $HAVE_UNLINKAT = 0 || test $REPLACE_UNLINKAT = 1; then
+    AC_LIBOBJ([unlinkat])
+  fi
+  gl_UNISTD_MODULE_INDICATOR([unlinkat])
   gl_FUNC_UNSETENV
   if test $HAVE_UNSETENV = 0 || test $REPLACE_UNSETENV = 1; then
     AC_LIBOBJ([unsetenv])
@@ -1368,11 +1383,6 @@
     AC_LIBOBJ([putenv])
   fi
   gl_STDLIB_MODULE_INDICATOR([putenv])
-  gl_FUNC_RMDIR
-  if test $REPLACE_RMDIR = 1; then
-    AC_LIBOBJ([rmdir])
-  fi
-  gl_UNISTD_MODULE_INDICATOR([rmdir])
   gl_FUNC_SETLOCALE
   if test $REPLACE_SETLOCALE = 1; then
     AC_LIBOBJ([setlocale])
@@ -1412,16 +1422,6 @@
   gl_UNISTD_MODULE_INDICATOR([symlinkat])
   AC_CHECK_FUNCS_ONCE([shutdown])
   gl_THREAD
-  gl_FUNC_UNLINK
-  if test $REPLACE_UNLINK = 1; then
-    AC_LIBOBJ([unlink])
-  fi
-  gl_UNISTD_MODULE_INDICATOR([unlink])
-  gl_FUNC_UNLINKAT
-  if test $HAVE_UNLINKAT = 0 || test $REPLACE_UNLINKAT = 1; then
-    AC_LIBOBJ([unlinkat])
-  fi
-  gl_UNISTD_MODULE_INDICATOR([unlinkat])
   gl_UNLINKDIR
   abs_aux_dir=`cd "$ac_aux_dir"; pwd`
   AC_SUBST([abs_aux_dir])
@@ -1791,6 +1791,7 @@
   lib/regex_internal.h
   lib/regexec.c
   lib/rewinddir.c
+  lib/rmdir.c
   lib/root-uid.h
   lib/rpmatch.c
   lib/same-inode.h
@@ -1872,6 +1873,8 @@
   lib/uniwidth.in.h
   lib/uniwidth/cjk.h
   lib/uniwidth/width.c
+  lib/unlink.c
+  lib/unlinkat.c
   lib/unsetenv.c
   lib/vasnprintf.c
   lib/vasnprintf.h
@@ -2464,15 +2467,12 @@
   tests=lib/priv-set.c
   tests=lib/priv-set.h
   tests=lib/putenv.c
-  tests=lib/rmdir.c
   tests=lib/setlocale.c
   tests=lib/sleep.c
   tests=lib/symlink.c
   tests=lib/symlinkat.c
   tests=lib/uinttostr.c
   tests=lib/umaxtostr.c
-  tests=lib/unlink.c
-  tests=lib/unlinkat.c
   tests=lib/unlinkdir.c
   tests=lib/unlinkdir.h
   tests=lib/usleep.c
--- a/gl/m4/gnulib-tool.m4
+++ b/gl/m4/gnulib-tool.m4
@@ -0,0 +1,57 @@
+# gnulib-tool.m4 serial 2
+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.
+
+dnl The following macros need not be invoked explicitly.
+dnl Invoking them does nothing except to declare default arguments
+dnl for "gnulib-tool --import".
+
+dnl Usage: gl_LOCAL_DIR([DIR])
+AC_DEFUN([gl_LOCAL_DIR], [])
+
+dnl Usage: gl_MODULES([module1 module2 ...])
+AC_DEFUN([gl_MODULES], [])
+
+dnl Usage: gl_AVOID([module1 module2 ...])
+AC_DEFUN([gl_AVOID], [])
+
+dnl Usage: gl_SOURCE_BASE([DIR])
+AC_DEFUN([gl_SOURCE_BASE], [])
+
+dnl Usage: gl_M4_BASE([DIR])
+AC_DEFUN([gl_M4_BASE], [])
+
+dnl Usage: gl_PO_BASE([DIR])
+AC_DEFUN([gl_PO_BASE], [])
+
+dnl Usage: gl_DOC_BASE([DIR])
+AC_DEFUN([gl_DOC_BASE], [])
+
+dnl Usage: gl_TESTS_BASE([DIR])
+AC_DEFUN([gl_TESTS_BASE], [])
+
+dnl Usage: gl_WITH_TESTS
+AC_DEFUN([gl_WITH_TESTS], [])
+
+dnl Usage: gl_LIB([LIBNAME])
+AC_DEFUN([gl_LIB], [])
+
+dnl Usage: gl_LGPL or gl_LGPL([VERSION])
+AC_DEFUN([gl_LGPL], [])
+
+dnl Usage: gl_MAKEFILE_NAME([FILENAME])
+AC_DEFUN([gl_MAKEFILE_NAME], [])
+
+dnl Usage: gl_LIBTOOL
+AC_DEFUN([gl_LIBTOOL], [])
+
+dnl Usage: gl_MACRO_PREFIX([PREFIX])
+AC_DEFUN([gl_MACRO_PREFIX], [])
+
+dnl Usage: gl_PO_DOMAIN([DOMAIN])
+AC_DEFUN([gl_PO_DOMAIN], [])
+
+dnl Usage: gl_VC_FILES([BOOLEAN])
+AC_DEFUN([gl_VC_FILES], [])
--- a/gl/m4/intdiv0.m4
+++ b/gl/m4/intdiv0.m4
@@ -0,0 +1,87 @@
+# intdiv0.m4 serial 6 (gettext-0.18.2)
+dnl Copyright (C) 2002, 2007-2008, 2010-2012 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.
+
+dnl From Bruno Haible.
+
+AC_DEFUN([gt_INTDIV0],
+[
+  AC_REQUIRE([AC_PROG_CC])dnl
+  AC_REQUIRE([AC_CANONICAL_HOST])dnl
+
+  AC_CACHE_CHECK([whether integer division by zero raises SIGFPE],
+    gt_cv_int_divbyzero_sigfpe,
+    [
+      gt_cv_int_divbyzero_sigfpe=
+changequote(,)dnl
+      case "$host_os" in
+        macos* | darwin[6-9]* | darwin[1-9][0-9]*)
+          # On Mac OS X 10.2 or newer, just assume the same as when cross-
+          # compiling. If we were to perform the real test, 1 Crash Report
+          # dialog window would pop up.
+          case "$host_cpu" in
+            i[34567]86 | x86_64)
+              gt_cv_int_divbyzero_sigfpe="guessing yes" ;;
+          esac
+          ;;
+      esac
+changequote([,])dnl
+      if test -z "$gt_cv_int_divbyzero_sigfpe"; then
+        AC_RUN_IFELSE(
+          [AC_LANG_SOURCE([[
+#include <stdlib.h>
+#include <signal.h>
+
+static void
+sigfpe_handler (int sig)
+{
+  /* Exit with code 0 if SIGFPE, with code 1 if any other signal.  */
+  exit (sig != SIGFPE);
+}
+
+int x = 1;
+int y = 0;
+int z;
+int nan;
+
+int main ()
+{
+  signal (SIGFPE, sigfpe_handler);
+/* IRIX and AIX (when "xlc -qcheck" is used) yield signal SIGTRAP.  */
+#if (defined (__sgi) || defined (_AIX)) && defined (SIGTRAP)
+  signal (SIGTRAP, sigfpe_handler);
+#endif
+/* Linux/SPARC yields signal SIGILL.  */
+#if defined (__sparc__) && defined (__linux__)
+  signal (SIGILL, sigfpe_handler);
+#endif
+
+  z = x / y;
+  nan = y / y;
+  exit (2);
+}
+]])],
+          [gt_cv_int_divbyzero_sigfpe=yes],
+          [gt_cv_int_divbyzero_sigfpe=no],
+          [
+            # Guess based on the CPU.
+changequote(,)dnl
+            case "$host_cpu" in
+              alpha* | i[34567]86 | x86_64 | m68k | s390*)
+                gt_cv_int_divbyzero_sigfpe="guessing yes";;
+              *)
+                gt_cv_int_divbyzero_sigfpe="guessing no";;
+            esac
+changequote([,])dnl
+          ])
+      fi
+    ])
+  case "$gt_cv_int_divbyzero_sigfpe" in
+    *yes) value=1;;
+    *) value=0;;
+  esac
+  AC_DEFINE_UNQUOTED([INTDIV0_RAISES_SIGFPE], [$value],
+    [Define if integer division by zero raises signal SIGFPE.])
+])
--- a/gl/m4/intldir.m4
+++ b/gl/m4/intldir.m4
@@ -0,0 +1,19 @@
+# intldir.m4 serial 2 (gettext-0.18)
+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.
+dnl
+dnl This file can can be used in projects which are not available under
+dnl the GNU General Public License or the GNU Library General Public
+dnl License but which still want to provide support for the GNU gettext
+dnl functionality.
+dnl Please note that the actual code of the GNU gettext library is covered
+dnl by the GNU Library General Public License, and the rest of the GNU
+dnl gettext package package is covered by the GNU General Public License.
+dnl They are *not* in the public domain.
+
+AC_PREREQ([2.52])
+
+dnl Tells the AM_GNU_GETTEXT macro to consider an intl/ directory.
+AC_DEFUN([AM_GNU_GETTEXT_INTL_SUBDIR], [])
--- a/gl/m4/intl.m4
+++ b/gl/m4/intl.m4
@@ -0,0 +1,294 @@
+# intl.m4 serial 17 (gettext-0.18)
+dnl Copyright (C) 1995-2009 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.
+dnl
+dnl This file can can be used in projects which are not available under
+dnl the GNU General Public License or the GNU Library General Public
+dnl License but which still want to provide support for the GNU gettext
+dnl functionality.
+dnl Please note that the actual code of the GNU gettext library is covered
+dnl by the GNU Library General Public License, and the rest of the GNU
+dnl gettext package package is covered by the GNU General Public License.
+dnl They are *not* in the public domain.
+
+dnl Authors:
+dnl   Ulrich Drepper <[e-mail]>, 1995-2000.
+dnl   Bruno Haible <[e-mail]>, 2000-2009.
+
+AC_PREREQ([2.52])
+
+dnl Checks for all prerequisites of the intl subdirectory,
+dnl except for INTL_LIBTOOL_SUFFIX_PREFIX (and possibly LIBTOOL), INTLOBJS,
+dnl            USE_INCLUDED_LIBINTL, BUILD_INCLUDED_LIBINTL.
+AC_DEFUN([AM_INTL_SUBDIR],
+[
+  AC_REQUIRE([AC_PROG_INSTALL])dnl
+  AC_REQUIRE([AM_PROG_MKDIR_P])dnl defined by automake
+  AC_REQUIRE([AC_PROG_CC])dnl
+  AC_REQUIRE([AC_CANONICAL_HOST])dnl
+  AC_REQUIRE([gt_GLIBC2])dnl
+  AC_REQUIRE([AC_PROG_RANLIB])dnl
+  AC_REQUIRE([gl_VISIBILITY])dnl
+  AC_REQUIRE([gt_INTL_SUBDIR_CORE])dnl
+  AC_REQUIRE([AC_TYPE_LONG_LONG_INT])dnl
+  AC_REQUIRE([gt_TYPE_WCHAR_T])dnl
+  AC_REQUIRE([gt_TYPE_WINT_T])dnl
+  AC_REQUIRE([gl_AC_HEADER_INTTYPES_H])
+  AC_REQUIRE([gt_TYPE_INTMAX_T])
+  AC_REQUIRE([gt_PRINTF_POSIX])
+  AC_REQUIRE([gl_GLIBC21])dnl
+  AC_REQUIRE([gl_XSIZE])dnl
+  AC_REQUIRE([gl_FCNTL_O_FLAGS])dnl
+  AC_REQUIRE([gt_INTL_MACOSX])dnl
+
+  dnl Support for automake's --enable-silent-rules.
+  case "$enable_silent_rules" in
+    yes) INTL_DEFAULT_VERBOSITY=0;;
+    no)  INTL_DEFAULT_VERBOSITY=1;;
+    *)   INTL_DEFAULT_VERBOSITY=1;;
+  esac
+  AC_SUBST([INTL_DEFAULT_VERBOSITY])
+
+  AC_CHECK_TYPE([ptrdiff_t], ,
+    [AC_DEFINE([ptrdiff_t], [long],
+       [Define as the type of the result of subtracting two pointers, if the system doesn't define it.])
+    ])
+  AC_CHECK_HEADERS([stddef.h stdlib.h string.h])
+  AC_CHECK_FUNCS([asprintf fwprintf newlocale putenv setenv setlocale \
+    snprintf strnlen wcslen wcsnlen mbrtowc wcrtomb])
+
+  dnl Use the _snprintf function only if it is declared (because on NetBSD it
+  dnl is defined as a weak alias of snprintf; we prefer to use the latter).
+  gt_CHECK_DECL(_snprintf, [#include <stdio.h>])
+  gt_CHECK_DECL(_snwprintf, [#include <stdio.h>])
+
+  dnl Use the *_unlocked functions only if they are declared.
+  dnl (because some of them were defined without being declared in Solaris
+  dnl 2.5.1 but were removed in Solaris 2.6, whereas we want binaries built
+  dnl on Solaris 2.5.1 to run on Solaris 2.6).
+  dnl Don't use AC_CHECK_DECLS because it isn't supported in autoconf-2.13.
+  gt_CHECK_DECL(getc_unlocked, [#include <stdio.h>])
+
+  case $gt_cv_func_printf_posix in
+    *yes) HAVE_POSIX_PRINTF=1 ;;
+    *) HAVE_POSIX_PRINTF=0 ;;
+  esac
+  AC_SUBST([HAVE_POSIX_PRINTF])
+  if test "$ac_cv_func_asprintf" = yes; then
+    HAVE_ASPRINTF=1
+  else
+    HAVE_ASPRINTF=0
+  fi
+  AC_SUBST([HAVE_ASPRINTF])
+  if test "$ac_cv_func_snprintf" = yes; then
+    HAVE_SNPRINTF=1
+  else
+    HAVE_SNPRINTF=0
+  fi
+  AC_SUBST([HAVE_SNPRINTF])
+  if test "$ac_cv_func_newlocale" = yes; then
+    HAVE_NEWLOCALE=1
+  else
+    HAVE_NEWLOCALE=0
+  fi
+  AC_SUBST([HAVE_NEWLOCALE])
+  if test "$ac_cv_func_wprintf" = yes; then
+    HAVE_WPRINTF=1
+  else
+    HAVE_WPRINTF=0
+  fi
+  AC_SUBST([HAVE_WPRINTF])
+
+  AM_LANGINFO_CODESET
+  gt_LC_MESSAGES
+
+  dnl Compilation on mingw and Cygwin needs special Makefile rules, because
+  dnl 1. when we install a shared library, we must arrange to export
+  dnl    auxiliary pointer variables for every exported variable,
+  dnl 2. when we install a shared library and a static library simultaneously,
+  dnl    the include file specifies __declspec(dllimport) and therefore we
+  dnl    must arrange to define the auxiliary pointer variables for the
+  dnl    exported variables _also_ in the static library.
+  if test "$enable_shared" = yes; then
+    case "$host_os" in
+      mingw* | cygwin*) is_woe32dll=yes ;;
+      *) is_woe32dll=no ;;
+    esac
+  else
+    is_woe32dll=no
+  fi
+  WOE32DLL=$is_woe32dll
+  AC_SUBST([WOE32DLL])
+
+  dnl On mingw and Cygwin, we can activate special Makefile rules which add
+  dnl version information to the shared libraries and executables.
+  case "$host_os" in
+    mingw* | cygwin*) is_woe32=yes ;;
+    *) is_woe32=no ;;
+  esac
+  WOE32=$is_woe32
+  AC_SUBST([WOE32])
+  if test $WOE32 = yes; then
+    dnl Check for a program that compiles Windows resource files.
+    AC_CHECK_TOOL([WINDRES], [windres])
+  fi
+
+  dnl Determine whether when creating a library, "-lc" should be passed to
+  dnl libtool or not. On many platforms, it is required for the libtool option
+  dnl -no-undefined to work. On HP-UX, however, the -lc - stored by libtool
+  dnl in the *.la files - makes it impossible to create multithreaded programs,
+  dnl because libtool also reorders the -lc to come before the -pthread, and
+  dnl this disables pthread_create() <http://docs.hp.com/en/1896/pthreads.html>.
+  case "$host_os" in
+    hpux*) LTLIBC="" ;;
+    *)     LTLIBC="-lc" ;;
+  esac
+  AC_SUBST([LTLIBC])
+
+  dnl Rename some macros and functions used for locking.
+  AH_BOTTOM([
+#define __libc_lock_t                   gl_lock_t
+#define __libc_lock_define              gl_lock_define
+#define __libc_lock_define_initialized  gl_lock_define_initialized
+#define __libc_lock_init                gl_lock_init
+#define __libc_lock_lock                gl_lock_lock
+#define __libc_lock_unlock              gl_lock_unlock
+#define __libc_lock_recursive_t                   gl_recursive_lock_t
+#define __libc_lock_define_recursive              gl_recursive_lock_define
+#define __libc_lock_define_initialized_recursive  gl_recursive_lock_define_initialized
+#define __libc_lock_init_recursive                gl_recursive_lock_init
+#define __libc_lock_lock_recursive                gl_recursive_lock_lock
+#define __libc_lock_unlock_recursive              gl_recursive_lock_unlock
+#define glthread_in_use  libintl_thread_in_use
+#define glthread_lock_init_func     libintl_lock_init_func
+#define glthread_lock_lock_func     libintl_lock_lock_func
+#define glthread_lock_unlock_func   libintl_lock_unlock_func
+#define glthread_lock_destroy_func  libintl_lock_destroy_func
+#define glthread_rwlock_init_multithreaded     libintl_rwlock_init_multithreaded
+#define glthread_rwlock_init_func              libintl_rwlock_init_func
+#define glthread_rwlock_rdlock_multithreaded   libintl_rwlock_rdlock_multithreaded
+#define glthread_rwlock_rdlock_func            libintl_rwlock_rdlock_func
+#define glthread_rwlock_wrlock_multithreaded   libintl_rwlock_wrlock_multithreaded
+#define glthread_rwlock_wrlock_func            libintl_rwlock_wrlock_func
+#define glthread_rwlock_unlock_multithreaded   libintl_rwlock_unlock_multithreaded
+#define glthread_rwlock_unlock_func            libintl_rwlock_unlock_func
+#define glthread_rwlock_destroy_multithreaded  libintl_rwlock_destroy_multithreaded
+#define glthread_rwlock_destroy_func           libintl_rwlock_destroy_func
+#define glthread_recursive_lock_init_multithreaded     libintl_recursive_lock_init_multithreaded
+#define glthread_recursive_lock_init_func              libintl_recursive_lock_init_func
+#define glthread_recursive_lock_lock_multithreaded     libintl_recursive_lock_lock_multithreaded
+#define glthread_recursive_lock_lock_func              libintl_recursive_lock_lock_func
+#define glthread_recursive_lock_unlock_multithreaded   libintl_recursive_lock_unlock_multithreaded
+#define glthread_recursive_lock_unlock_func            libintl_recursive_lock_unlock_func
+#define glthread_recursive_lock_destroy_multithreaded  libintl_recursive_lock_destroy_multithreaded
+#define glthread_recursive_lock_destroy_func           libintl_recursive_lock_destroy_func
+#define glthread_once_func            libintl_once_func
+#define glthread_once_singlethreaded  libintl_once_singlethreaded
+#define glthread_once_multithreaded   libintl_once_multithreaded
+])
+])
+
+
+dnl Checks for the core files of the intl subdirectory:
+dnl   dcigettext.c
+dnl   eval-plural.h
+dnl   explodename.c
+dnl   finddomain.c
+dnl   gettextP.h
+dnl   gmo.h
+dnl   hash-string.h hash-string.c
+dnl   l10nflist.c
+dnl   libgnuintl.h.in (except the *printf stuff)
+dnl   loadinfo.h
+dnl   loadmsgcat.c
+dnl   localealias.c
+dnl   log.c
+dnl   plural-exp.h plural-exp.c
+dnl   plural.y
+dnl Used by libglocale.
+AC_DEFUN([gt_INTL_SUBDIR_CORE],
+[
+  AC_REQUIRE([AC_C_INLINE])dnl
+  AC_REQUIRE([AC_TYPE_SIZE_T])dnl
+  AC_REQUIRE([gl_AC_HEADER_STDINT_H])
+  AC_REQUIRE([AC_FUNC_ALLOCA])dnl
+  AC_REQUIRE([AC_FUNC_MMAP])dnl
+  AC_REQUIRE([gt_INTDIV0])dnl
+  AC_REQUIRE([gl_AC_TYPE_UINTMAX_T])dnl
+  AC_REQUIRE([gt_INTTYPES_PRI])dnl
+  AC_REQUIRE([gl_LOCK])dnl
+
+  AC_TRY_LINK(
+    [int foo (int a) { a = __builtin_expect (a, 10); return a == 10 ? 0 : 1; }],
+    [],
+    [AC_DEFINE([HAVE_BUILTIN_EXPECT], [1],
+       [Define to 1 if the compiler understands __builtin_expect.])])
+
+  AC_CHECK_HEADERS([argz.h inttypes.h limits.h unistd.h sys/param.h])
+  AC_CHECK_FUNCS([getcwd getegid geteuid getgid getuid mempcpy munmap \
+    stpcpy strcasecmp strdup strtoul tsearch uselocale argz_count \
+    argz_stringify argz_next __fsetlocking])
+
+  dnl Use the *_unlocked functions only if they are declared.
+  dnl (because some of them were defined without being declared in Solaris
+  dnl 2.5.1 but were removed in Solaris 2.6, whereas we want binaries built
+  dnl on Solaris 2.5.1 to run on Solaris 2.6).
+  dnl Don't use AC_CHECK_DECLS because it isn't supported in autoconf-2.13.
+  gt_CHECK_DECL([feof_unlocked], [#include <stdio.h>])
+  gt_CHECK_DECL([fgets_unlocked], [#include <stdio.h>])
+
+  AM_ICONV
+
+  dnl intl/plural.c is generated from intl/plural.y. It requires bison,
+  dnl because plural.y uses bison specific features. It requires at least
+  dnl bison-1.26 because earlier versions generate a plural.c that doesn't
+  dnl compile.
+  dnl bison is only needed for the maintainer (who touches plural.y). But in
+  dnl order to avoid separate Makefiles or --enable-maintainer-mode, we put
+  dnl the rule in general Makefile. Now, some people carelessly touch the
+  dnl files or have a broken "make" program, hence the plural.c rule will
+  dnl sometimes fire. To avoid an error, defines BISON to ":" if it is not
+  dnl present or too old.
+  AC_CHECK_PROGS([INTLBISON], [bison])
+  if test -z "$INTLBISON"; then
+    ac_verc_fail=yes
+  else
+    dnl Found it, now check the version.
+    AC_MSG_CHECKING([version of bison])
+changequote(<<,>>)dnl
+    ac_prog_version=`$INTLBISON --version 2>&1 | sed -n 's/^.*GNU Bison.* \([0-9]*\.[0-9.]*\).*$/\1/p'`
+    case $ac_prog_version in
+      '') ac_prog_version="v. ?.??, bad"; ac_verc_fail=yes;;
+      1.2[6-9]* | 1.[3-9][0-9]* | [2-9].*)
+changequote([,])dnl
+         ac_prog_version="$ac_prog_version, ok"; ac_verc_fail=no;;
+      *) ac_prog_version="$ac_prog_version, bad"; ac_verc_fail=yes;;
+    esac
+    AC_MSG_RESULT([$ac_prog_version])
+  fi
+  if test $ac_verc_fail = yes; then
+    INTLBISON=:
+  fi
+])
+
+
+dnl gt_CHECK_DECL(FUNC, INCLUDES)
+dnl Check whether a function is declared.
+AC_DEFUN([gt_CHECK_DECL],
+[
+  AC_CACHE_CHECK([whether $1 is declared], [ac_cv_have_decl_$1],
+    [AC_TRY_COMPILE([$2], [
+#ifndef $1
+  char *p = (char *) $1;
+#endif
+], ac_cv_have_decl_$1=yes, ac_cv_have_decl_$1=no)])
+  if test $ac_cv_have_decl_$1 = yes; then
+    gt_value=1
+  else
+    gt_value=0
+  fi
+  AC_DEFINE_UNQUOTED([HAVE_DECL_]translit($1, [a-z], [A-Z]), [$gt_value],
+    [Define to 1 if you have the declaration of `$1', and to 0 if you don't.])
+])
--- a/gl/m4/intmax.m4
+++ b/gl/m4/intmax.m4
@@ -0,0 +1,36 @@
+# intmax.m4 serial 6 (gettext-0.18.2)
+dnl Copyright (C) 2002-2005, 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.
+
+dnl From Bruno Haible.
+dnl Test whether the system has the 'intmax_t' type, but don't attempt to
+dnl find a replacement if it is lacking.
+
+AC_DEFUN([gt_TYPE_INTMAX_T],
+[
+  AC_REQUIRE([gl_AC_HEADER_INTTYPES_H])
+  AC_REQUIRE([gl_AC_HEADER_STDINT_H])
+  AC_CACHE_CHECK([for intmax_t], [gt_cv_c_intmax_t],
+    [AC_COMPILE_IFELSE(
+       [AC_LANG_PROGRAM(
+          [[
+#include <stddef.h>
+#include <stdlib.h>
+#if HAVE_STDINT_H_WITH_UINTMAX
+#include <stdint.h>
+#endif
+#if HAVE_INTTYPES_H_WITH_UINTMAX
+#include <inttypes.h>
+#endif
+          ]],
+          [[intmax_t x = -1;
+            return !x;]])],
+       [gt_cv_c_intmax_t=yes],
+       [gt_cv_c_intmax_t=no])])
+  if test $gt_cv_c_intmax_t = yes; then
+    AC_DEFINE([HAVE_INTMAX_T], [1],
+      [Define if you have the 'intmax_t' type in <stdint.h> or <inttypes.h>.])
+  fi
+])
--- a/gl/m4/printf-posix.m4
+++ b/gl/m4/printf-posix.m4
@@ -0,0 +1,48 @@
+# printf-posix.m4 serial 6 (gettext-0.18.2)
+dnl Copyright (C) 2003, 2007, 2009-2012 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+dnl From Bruno Haible.
+dnl Test whether the printf() function supports POSIX/XSI format strings with
+dnl positions.
+
+AC_DEFUN([gt_PRINTF_POSIX],
+[
+  AC_REQUIRE([AC_PROG_CC])
+  AC_CACHE_CHECK([whether printf() supports POSIX/XSI format strings],
+    gt_cv_func_printf_posix,
+    [
+      AC_RUN_IFELSE(
+        [AC_LANG_SOURCE([[
+#include <stdio.h>
+#include <string.h>
+/* The string "%2$d %1$d", with dollar characters protected from the shell's
+   dollar expansion (possibly an autoconf bug).  */
+static char format[] = { '%', '2', '$', 'd', ' ', '%', '1', '$', 'd', '\0' };
+static char buf[100];
+int main ()
+{
+  sprintf (buf, format, 33, 55);
+  return (strcmp (buf, "55 33") != 0);
+}]])],
+        [gt_cv_func_printf_posix=yes],
+        [gt_cv_func_printf_posix=no],
+        [
+          AC_EGREP_CPP([notposix], [
+#if defined __NetBSD__ || defined __BEOS__ || defined _MSC_VER || defined __MINGW32__ || defined __CYGWIN__
+  notposix
+#endif
+            ],
+            [gt_cv_func_printf_posix="guessing no"],
+            [gt_cv_func_printf_posix="guessing yes"])
+        ])
+    ])
+  case $gt_cv_func_printf_posix in
+    *yes)
+      AC_DEFINE([HAVE_POSIX_PRINTF], [1],
+        [Define if your printf() function supports format strings with positions.])
+      ;;
+  esac
+])
--- a/gl/m4/sockpfaf.m4
+++ b/gl/m4/sockpfaf.m4
@@ -0,0 +1,87 @@
+# sockpfaf.m4 serial 8
+dnl Copyright (C) 2004, 2006, 2009-2012 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+dnl Test for some common socket protocol families (PF_INET, PF_INET6, ...)
+dnl and some common address families (AF_INET, AF_INET6, ...).
+dnl This test assumes that a system supports an address family if and only if
+dnl it supports the corresponding protocol family.
+
+dnl From Bruno Haible.
+
+AC_DEFUN([gl_SOCKET_FAMILIES],
+[
+  AC_REQUIRE([gl_HEADER_SYS_SOCKET])
+  AC_CHECK_HEADERS_ONCE([netinet/in.h])
+
+  AC_MSG_CHECKING([for IPv4 sockets])
+  AC_CACHE_VAL([gl_cv_socket_ipv4],
+    [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <sys/types.h>
+#ifdef HAVE_SYS_SOCKET_H
+#include <sys/socket.h>
+#endif
+#ifdef HAVE_NETINET_IN_H
+#include <netinet/in.h>
+#endif
+#ifdef HAVE_WINSOCK2_H
+#include <winsock2.h>
+#endif]],
+[[int x = AF_INET; struct in_addr y; struct sockaddr_in z;
+ if (&x && &y && &z) return 0;]])],
+       gl_cv_socket_ipv4=yes, gl_cv_socket_ipv4=no)])
+  AC_MSG_RESULT([$gl_cv_socket_ipv4])
+  if test $gl_cv_socket_ipv4 = yes; then
+    AC_DEFINE([HAVE_IPV4], [1], [Define to 1 if <sys/socket.h> defines AF_INET.])
+  fi
+
+  AC_MSG_CHECKING([for IPv6 sockets])
+  AC_CACHE_VAL([gl_cv_socket_ipv6],
+    [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <sys/types.h>
+#ifdef HAVE_SYS_SOCKET_H
+#include <sys/socket.h>
+#endif
+#ifdef HAVE_NETINET_IN_H
+#include <netinet/in.h>
+#endif
+#ifdef HAVE_WINSOCK2_H
+#include <winsock2.h>
+#endif
+#ifdef HAVE_WS2TCPIP_H
+#include <ws2tcpip.h>
+#endif]],
+[[int x = AF_INET6; struct in6_addr y; struct sockaddr_in6 z;
+ if (&x && &y && &z) return 0;]])],
+       gl_cv_socket_ipv6=yes, gl_cv_socket_ipv6=no)])
+  AC_MSG_RESULT([$gl_cv_socket_ipv6])
+  if test $gl_cv_socket_ipv6 = yes; then
+    AC_DEFINE([HAVE_IPV6], [1], [Define to 1 if <sys/socket.h> defines AF_INET6.])
+  fi
+])
+
+AC_DEFUN([gl_SOCKET_FAMILY_UNIX],
+[
+  AC_REQUIRE([gl_HEADER_SYS_SOCKET])
+  AC_CHECK_HEADERS_ONCE([sys/un.h])
+
+  AC_MSG_CHECKING([for UNIX domain sockets])
+  AC_CACHE_VAL([gl_cv_socket_unix],
+    [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <sys/types.h>
+#ifdef HAVE_SYS_SOCKET_H
+#include <sys/socket.h>
+#endif
+#ifdef HAVE_SYS_UN_H
+#include <sys/un.h>
+#endif
+#ifdef HAVE_WINSOCK2_H
+#include <winsock2.h>
+#endif]],
+[[int x = AF_UNIX; struct sockaddr_un y;
+ if (&x && &y) return 0;]])],
+       gl_cv_socket_unix=yes, gl_cv_socket_unix=no)])
+  AC_MSG_RESULT([$gl_cv_socket_unix])
+  if test $gl_cv_socket_unix = yes; then
+    AC_DEFINE([HAVE_UNIXSOCKET], [1], [Define to 1 if <sys/socket.h> defines AF_UNIX.])
+  fi
+])
--- a/gl/m4/uintmax_t.m4
+++ b/gl/m4/uintmax_t.m4
@@ -0,0 +1,30 @@
+# uintmax_t.m4 serial 12
+dnl Copyright (C) 1997-2004, 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.
+
+dnl From Paul Eggert.
+
+AC_PREREQ([2.13])
+
+# Define uintmax_t to 'unsigned long' or 'unsigned long long'
+# if it is not already defined in <stdint.h> or <inttypes.h>.
+
+AC_DEFUN([gl_AC_TYPE_UINTMAX_T],
+[
+  AC_REQUIRE([gl_AC_HEADER_INTTYPES_H])
+  AC_REQUIRE([gl_AC_HEADER_STDINT_H])
+  if test $gl_cv_header_inttypes_h = no && test $gl_cv_header_stdint_h = no; then
+    AC_REQUIRE([AC_TYPE_UNSIGNED_LONG_LONG_INT])
+    test $ac_cv_type_unsigned_long_long_int = yes \
+      && ac_type='unsigned long long' \
+      || ac_type='unsigned long'
+    AC_DEFINE_UNQUOTED([uintmax_t], [$ac_type],
+      [Define to unsigned long or unsigned long long
+       if <stdint.h> and <inttypes.h> don't define.])
+  else
+    AC_DEFINE([HAVE_UINTMAX_T], [1],
+      [Define if you have the 'uintmax_t' type in <stdint.h> or <inttypes.h>.])
+  fi
+])
--- a/gl/m4/visibility.m4
+++ b/gl/m4/visibility.m4
@@ -0,0 +1,77 @@
+# visibility.m4 serial 5 (gettext-0.18.2)
+dnl Copyright (C) 2005, 2008, 2010-2012 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.
+
+dnl From Bruno Haible.
+
+dnl Tests whether the compiler supports the command-line option
+dnl -fvisibility=hidden and the function and variable attributes
+dnl __attribute__((__visibility__("hidden"))) and
+dnl __attribute__((__visibility__("default"))).
+dnl Does *not* test for __visibility__("protected") - which has tricky
+dnl semantics (see the 'vismain' test in glibc) and does not exist e.g. on
+dnl Mac OS X.
+dnl Does *not* test for __visibility__("internal") - which has processor
+dnl dependent semantics.
+dnl Does *not* test for #pragma GCC visibility push(hidden) - which is
+dnl "really only recommended for legacy code".
+dnl Set the variable CFLAG_VISIBILITY.
+dnl Defines and sets the variable HAVE_VISIBILITY.
+
+AC_DEFUN([gl_VISIBILITY],
+[
+  AC_REQUIRE([AC_PROG_CC])
+  CFLAG_VISIBILITY=
+  HAVE_VISIBILITY=0
+  if test -n "$GCC"; then
+    dnl First, check whether -Werror can be added to the command line, or
+    dnl whether it leads to an error because of some other option that the
+    dnl user has put into $CC $CFLAGS $CPPFLAGS.
+    AC_MSG_CHECKING([whether the -Werror option is usable])
+    AC_CACHE_VAL([gl_cv_cc_vis_werror], [
+      gl_save_CFLAGS="$CFLAGS"
+      CFLAGS="$CFLAGS -Werror"
+      AC_COMPILE_IFELSE(
+        [AC_LANG_PROGRAM([[]], [[]])],
+        [gl_cv_cc_vis_werror=yes],
+        [gl_cv_cc_vis_werror=no])
+      CFLAGS="$gl_save_CFLAGS"])
+    AC_MSG_RESULT([$gl_cv_cc_vis_werror])
+    dnl Now check whether visibility declarations are supported.
+    AC_MSG_CHECKING([for simple visibility declarations])
+    AC_CACHE_VAL([gl_cv_cc_visibility], [
+      gl_save_CFLAGS="$CFLAGS"
+      CFLAGS="$CFLAGS -fvisibility=hidden"
+      dnl We use the option -Werror and a function dummyfunc, because on some
+      dnl platforms (Cygwin 1.7) the use of -fvisibility triggers a warning
+      dnl "visibility attribute not supported in this configuration; ignored"
+      dnl at the first function definition in every compilation unit, and we
+      dnl don't want to use the option in this case.
+      if test $gl_cv_cc_vis_werror = yes; then
+        CFLAGS="$CFLAGS -Werror"
+      fi
+      AC_COMPILE_IFELSE(
+        [AC_LANG_PROGRAM(
+           [[extern __attribute__((__visibility__("hidden"))) int hiddenvar;
+             extern __attribute__((__visibility__("default"))) int exportedvar;
+             extern __attribute__((__visibility__("hidden"))) int hiddenfunc (void);
+             extern __attribute__((__visibility__("default"))) int exportedfunc (void);
+             void dummyfunc (void) {}
+           ]],
+           [[]])],
+        [gl_cv_cc_visibility=yes],
+        [gl_cv_cc_visibility=no])
+      CFLAGS="$gl_save_CFLAGS"])
+    AC_MSG_RESULT([$gl_cv_cc_visibility])
+    if test $gl_cv_cc_visibility = yes; then
+      CFLAG_VISIBILITY="-fvisibility=hidden"
+      HAVE_VISIBILITY=1
+    fi
+  fi
+  AC_SUBST([CFLAG_VISIBILITY])
+  AC_SUBST([HAVE_VISIBILITY])
+  AC_DEFINE_UNQUOTED([HAVE_VISIBILITY], [$HAVE_VISIBILITY],
+    [Define to 1 or 0, depending whether the compiler supports simple visibility declarations.])
+])