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[PATCH 1/2] Rename xlocale.h to bits/types/__locale_t.h.


xlocale.h is already a single-type micro-header, defining struct
__locale_struct and the typedefs __locale_t and locale_t.  This patch
brings it into the bits/types/ scheme: there are now
bits/types/__locale_t.h which defines only __locale_struct and
__locale_t, and bits/types/locale_t.h which defines locale_t as well
as the other two.  None of *our* headers need __locale_t.h, but it
appears to me that libstdc++ could make use of it.

There are a lot of external uses of xlocale.h, but Florian has
persuaded me that just dropping it is actually safer than replacing it
with a deprecation shim, because most of the users are checking for it
with autoconf, which will notice a complete removal but not a
replacement that emits a #warning.

I also took the opportunity to clean up comments in various public
header files that still talk about the *_l interfaces as though they
were completely nonstandard.  There are a few of them, notably the
strtoX_l and wcstoX_l families, that haven't been standardized, but
the bulk are in POSIX.1-2008.

	* locale/bits/types/locale_t.h: New file containing former
	contents of locale/xlocale.h, with minor adjustments to commentary.
	* locale/xlocale.h: Replace with deprecation shim that issues a
	warning and includes <locale.h>.
	* locale/Makefile: Install bits/types/locale_t.h.
	* scripts/check-installed-headers.sh: Skip xlocale.h.
	* include/xlocale.h: Delete wrapper.
	* include/bits/types/locale_t.h: New wrapper.

	* ctype/ctype.h, include/printf.h, include/time.h
	* locale/langinfo.h, locale/locale.h, stdlib/monetary.h
	* stdlib/stdlib.h, string/string.h, string/strings.h, time/time.h
	* wcsmbs/wchar.h, wctype/wctype.h: Use bits/types/locale_t.h.
	Correct outdated comments regarding the standardization status of
	the functions that take locale_t arguments.

	* stdlib/strtod_l.c, stdlib/strtof_l.c, stdlib/strtol_l.c
	* stdlib/strtold_l.c, stdlib/strtoul_l.c, stdlib/strtoull_l.c
	* sysdeps/ieee754/ldbl-128ibm/strtold_l.c
	* sysdeps/ieee754/ldbl-64-128/strtold_l.c
        * wcsmbs/wcstod.c, wcsmbs/wcstod_l.c, wcsmbs/wcstof.c
	* wcsmbs/wcstof_l.c, wcsmbs/wcstold.c, wcsmbs/wcstold_l.c:
        Don't include xlocale.h. If necessary, include locale.h instead.

	* stdlib/strtold_l.c: Unconditionally include wchar.h.
---
 NEWS                                          |  4 ++++
 ctype/ctype.h                                 | 16 ++--------------
 dev/null                                      |  0
 include/bits/types/__locale_t.h               |  1 +
 include/bits/types/locale_t.h                 |  1 +
 include/printf.h                              |  2 +-
 include/time.h                                |  2 +-
 include/xlocale.h                             |  1 -
 locale/Makefile                               |  3 ++-
 locale/{xlocale.h => bits/types/__locale_t.h} | 24 ++++++++++++------------
 locale/bits/types/locale_t.h                  | 26 ++++++++++++++++++++++++++
 locale/langinfo.h                             |  7 ++-----
 locale/locale.h                               | 20 +++++++-------------
 stdlib/monetary.h                             |  3 ++-
 stdlib/stdlib.h                               | 20 ++++----------------
 stdlib/strtod_l.c                             |  3 +--
 stdlib/strtof_l.c                             |  2 +-
 stdlib/strtol_l.c                             |  1 -
 stdlib/strtold_l.c                            |  6 +-----
 stdlib/strtoll_l.c                            |  2 +-
 stdlib/strtoul_l.c                            |  2 +-
 stdlib/strtoull_l.c                           |  2 +-
 string/string.h                               |  3 ++-
 string/strings.h                              |  3 ++-
 sysdeps/ieee754/ldbl-128ibm/strtold_l.c       |  1 -
 sysdeps/ieee754/ldbl-64-128/strtold_l.c       |  1 -
 time/time.h                                   |  2 +-
 wcsmbs/wchar.h                                | 27 ++++++---------------------
 wcsmbs/wcstod.c                               |  2 +-
 wcsmbs/wcstod_l.c                             |  2 +-
 wcsmbs/wcstof.c                               |  2 +-
 wcsmbs/wcstof_l.c                             |  2 +-
 wcsmbs/wcstold.c                              |  2 +-
 wcsmbs/wcstold_l.c                            |  2 +-
 wctype/wctype.h                               |  4 ++--
 35 files changed, 90 insertions(+), 111 deletions(-)
 create mode 100644 dev/null
 create mode 100644 include/bits/types/__locale_t.h
 create mode 100644 include/bits/types/locale_t.h
 delete mode 100644 include/xlocale.h
 rename locale/{xlocale.h => bits/types/__locale_t.h} (72%)
 create mode 100644 locale/bits/types/locale_t.h

diff --git a/NEWS b/NEWS
index 4db334b687..0736b4b27f 100644
--- a/NEWS
+++ b/NEWS
@@ -74,6 +74,10 @@ Version 2.26
   as this kind of optimization is better done by the compiler.  The macros
   __USE_STRING_INLINES and __NO_STRING_INLINES no longer have any effect.
 
+* The nonstandard header <xlocale.h> has been removed.  Most programs should
+  use <locale.h> instead.  If you have a specific need for the definition
+  of locale_t with no other declarations, please talk to us.
+
 * The reallocarray function has been added to libc.  It is a realloc
   replacement with a check for integer overflow when calculating total
   allocation size.
diff --git a/ctype/ctype.h b/ctype/ctype.h
index 1fe89cf836..ce598d53e5 100644
--- a/ctype/ctype.h
+++ b/ctype/ctype.h
@@ -233,20 +233,8 @@ __NTH (toupper (int __c))
 
 
 #ifdef __USE_XOPEN2K8
-/* The concept of one static locale per category is not very well
-   thought out.  Many applications will need to process its data using
-   information from several different locales.  Another application is
-   the implementation of the internationalization handling in the
-   upcoming ISO C++ standard library.  To support this another set of
-   the functions using locale data exist which have an additional
-   argument.
-
-   Attention: all these functions are *not* standardized in any form.
-   This is a proof-of-concept implementation.  */
-
-/* Structure for reentrant locale using functions.  This is an
-   (almost) opaque type for the user level programs.  */
-# include <xlocale.h>
+/* POSIX.1-2008 extended locale interface (see locale.h).  */
+# include <bits/types/locale_t.h>
 
 /* These definitions are similar to the ones above but all functions
    take as an argument a handle for the locale which shall be used.  */
diff --git a/dev/null b/dev/null
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/include/bits/types/__locale_t.h b/include/bits/types/__locale_t.h
new file mode 100644
index 0000000000..610b8197c7
--- /dev/null
+++ b/include/bits/types/__locale_t.h
@@ -0,0 +1 @@
+#include <locale/bits/types/__locale_t.h>
diff --git a/include/bits/types/locale_t.h b/include/bits/types/locale_t.h
new file mode 100644
index 0000000000..24b074872f
--- /dev/null
+++ b/include/bits/types/locale_t.h
@@ -0,0 +1 @@
+#include <locale/bits/types/locale_t.h>
diff --git a/include/printf.h b/include/printf.h
index 984f263167..7b4d209c47 100644
--- a/include/printf.h
+++ b/include/printf.h
@@ -4,7 +4,7 @@
 
 # ifndef _ISOMAC
 
-#include <xlocale.h>
+#include <bits/types/locale_t.h>
 
 /* Now define the internal interfaces.  */
 extern int __printf_fphex (FILE *, const struct printf_info *,
diff --git a/include/time.h b/include/time.h
index 3a828e0420..0a67cf3a19 100644
--- a/include/time.h
+++ b/include/time.h
@@ -2,7 +2,7 @@
 #include <time/time.h>
 
 #ifndef _ISOMAC
-# include <xlocale.h>
+# include <bits/types/locale_t.h>
 
 extern __typeof (strftime_l) __strftime_l;
 libc_hidden_proto (__strftime_l)
diff --git a/include/xlocale.h b/include/xlocale.h
deleted file mode 100644
index 5280ef0bc4..0000000000
--- a/include/xlocale.h
+++ /dev/null
@@ -1 +0,0 @@
-#include <locale/xlocale.h>
diff --git a/locale/Makefile b/locale/Makefile
index d9ef48fe93..98ee76272d 100644
--- a/locale/Makefile
+++ b/locale/Makefile
@@ -22,7 +22,8 @@ subdir	:= locale
 
 include ../Makeconfig
 
-headers		= locale.h bits/locale.h langinfo.h xlocale.h
+headers		= langinfo.h locale.h bits/locale.h \
+		  bits/types/locale_t.h bits/types/__locale_t.h
 routines	= setlocale findlocale loadlocale loadarchive \
 		  localeconv nl_langinfo nl_langinfo_l mb_cur_max \
 		  newlocale duplocale freelocale uselocale
diff --git a/locale/xlocale.h b/locale/bits/types/__locale_t.h
similarity index 72%
rename from locale/xlocale.h
rename to locale/bits/types/__locale_t.h
index 20b2c1109f..4511aa1929 100644
--- a/locale/xlocale.h
+++ b/locale/bits/types/__locale_t.h
@@ -1,4 +1,4 @@
-/* Definition of locale datatype.
+/* Definition of struct __locale_struct and __locale_t.
    Copyright (C) 1997-2017 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
@@ -17,14 +17,15 @@
    License along with the GNU C Library; if not, see
    <http://www.gnu.org/licenses/>.  */
 
-#ifndef _XLOCALE_H
-#define _XLOCALE_H	1
+#ifndef _BITS_TYPES___LOCALE_T_H
+#define _BITS_TYPES___LOCALE_T_H 1
 
-/* Structure for reentrant locale using functions.  This is an
-   (almost) opaque type for the user level programs.  The file and
-   this data structure is not standardized.  Don't rely on it.  It can
-   go away without warning.  */
-typedef struct __locale_struct
+/* POSIX.1-2008: the locale_t type, representing a locale context
+   (implementation-namespace version).  This type should be treated
+   as opaque by applications; some details are exposed for the sake of
+   efficiency in e.g. ctype functions.  */
+
+struct __locale_struct
 {
   /* Note: LC_ALL is not a valid index into this array.  */
   struct __locale_data *__locales[13]; /* 13 = __LC_LAST. */
@@ -36,9 +37,8 @@ typedef struct __locale_struct
 
   /* Note: LC_ALL is not a valid index into this array.  */
   const char *__names[13];
-} *__locale_t;
+};
 
-/* POSIX 2008 makes locale_t official.  */
-typedef __locale_t locale_t;
+typedef struct __locale_struct *__locale_t;
 
-#endif /* xlocale.h */
+#endif /* bits/types/__locale_t.h */
diff --git a/locale/bits/types/locale_t.h b/locale/bits/types/locale_t.h
new file mode 100644
index 0000000000..de7ec2ee84
--- /dev/null
+++ b/locale/bits/types/locale_t.h
@@ -0,0 +1,26 @@
+/* Definition of locale_t.
+   Copyright (C) 2017 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef _BITS_TYPES_LOCALE_T_H
+#define _BITS_TYPES_LOCALE_T_H 1
+
+#include <bits/types/__locale_t.h>
+
+typedef __locale_t locale_t;
+
+#endif /* bits/types/locale_t.h */
diff --git a/locale/langinfo.h b/locale/langinfo.h
index 759adfbd1f..93d84463b5 100644
--- a/locale/langinfo.h
+++ b/locale/langinfo.h
@@ -584,11 +584,8 @@ extern char *nl_langinfo (nl_item __item) __THROW;
 
 
 #ifdef __USE_XOPEN2K8
-/* This interface is for the extended locale model.  See <locale.h> for
-   more information.  */
-
-/* Get locale datatype definition.  */
-# include <xlocale.h>
+/* POSIX.1-2008 extended locale interface (see locale.h).  */
+# include <bits/types/locale_t.h>
 
 /* Just like nl_langinfo but get the information from the locale object L.  */
 extern char *nl_langinfo_l (nl_item __item, __locale_t __l);
diff --git a/locale/locale.h b/locale/locale.h
index 9a5fce9d47..6c1b22051b 100644
--- a/locale/locale.h
+++ b/locale/locale.h
@@ -126,19 +126,13 @@ extern struct lconv *localeconv (void) __THROW;
 
 
 #ifdef	__USE_XOPEN2K8
-/* The concept of one static locale per category is not very well
-   thought out.  Many applications will need to process its data using
-   information from several different locales.  Another application is
-   the implementation of the internationalization handling in the
-   upcoming ISO C++ standard library.  To support this another set of
-   the functions using locale data exist which have an additional
-   argument.
-
-   Attention: all these functions are *not* standardized in any form.
-   This is a proof-of-concept implementation.  */
-
-/* Get locale datatype definition.  */
-# include <xlocale.h>
+/* POSIX.1-2008 extends the locale interface with functions for
+   explicit creation and manipulation of 'locale_t' objects
+   representing locale contexts, and a set of parallel
+   locale-sensitive text processing functions that take a locale_t
+   argument.  This enables applications to work with data from
+   multiple locales simultaneously and thread-safely.  */
+# include <bits/types/locale_t.h>
 
 /* Return a reference to a data structure representing a set of locale
    datasets.  Unlike for the CATEGORY parameter for `setlocale' the
diff --git a/stdlib/monetary.h b/stdlib/monetary.h
index dcfbfc5262..c1fcbf06d1 100644
--- a/stdlib/monetary.h
+++ b/stdlib/monetary.h
@@ -40,7 +40,8 @@ extern ssize_t strfmon (char *__restrict __s, size_t __maxsize,
      __THROW __attribute_format_strfmon__ (3, 4);
 
 #ifdef __USE_XOPEN2K8
-# include <xlocale.h>
+/* POSIX.1-2008 extended locale interface (see locale.h).  */
+# include <bits/types/locale_t.h>
 
 /* Formatting a monetary value according to the given locale.  */
 extern ssize_t strfmon_l (char *__restrict __s, size_t __maxsize,
diff --git a/stdlib/stdlib.h b/stdlib/stdlib.h
index 6f1e70e254..ce2602e03a 100644
--- a/stdlib/stdlib.h
+++ b/stdlib/stdlib.h
@@ -193,23 +193,11 @@ extern int strfromf128 (char *__dest, size_t __size, const char * __format,
 
 
 #ifdef __USE_GNU
-/* The concept of one static locale per category is not very well
-   thought out.  Many applications will need to process its data using
-   information from several different locales.  Another problem is
-   the implementation of the internationalization handling in the
-   ISO C++ standard library.  To support this another set of
-   the functions using locale data exist which take an additional
-   argument.
+/* Parallel versions of the functions above which take the locale to
+   use as an additional parameter.  These are GNU extensions inspired
+   by the POSIX.1-2008 extended locale API.  */
+# include <bits/types/locale_t.h>
 
-   Attention: even though several *_l interfaces are part of POSIX:2008,
-   these are not.  */
-
-/* Structure for reentrant locale using functions.  This is an
-   (almost) opaque type for the user level programs.  */
-# include <xlocale.h>
-
-/* Special versions of the functions above which take the locale to
-   use as an additional parameter.  */
 extern long int strtol_l (const char *__restrict __nptr,
 			  char **__restrict __endptr, int __base,
 			  __locale_t __loc) __THROW __nonnull ((1, 4));
diff --git a/stdlib/strtod_l.c b/stdlib/strtod_l.c
index 99c2af357e..a782a2434b 100644
--- a/stdlib/strtod_l.c
+++ b/stdlib/strtod_l.c
@@ -17,7 +17,7 @@
    License along with the GNU C Library; if not, see
    <http://www.gnu.org/licenses/>.  */
 
-#include <xlocale.h>
+#include <locale.h>
 
 extern double ____strtod_l_internal (const char *, char **, int, __locale_t);
 
@@ -46,7 +46,6 @@ extern double ____strtod_l_internal (const char *, char **, int, __locale_t);
 #include <errno.h>
 #include <float.h>
 #include "../locale/localeinfo.h"
-#include <locale.h>
 #include <math.h>
 #include <math_private.h>
 #include <stdlib.h>
diff --git a/stdlib/strtof_l.c b/stdlib/strtof_l.c
index 57e557516a..ea76c344f4 100644
--- a/stdlib/strtof_l.c
+++ b/stdlib/strtof_l.c
@@ -17,7 +17,7 @@
    License along with the GNU C Library; if not, see
    <http://www.gnu.org/licenses/>.  */
 
-#include <xlocale.h>
+#include <locale.h>
 
 extern float ____strtof_l_internal (const char *, char **, int, __locale_t);
 
diff --git a/stdlib/strtol_l.c b/stdlib/strtol_l.c
index 5a0683b2bb..48e9ab5310 100644
--- a/stdlib/strtol_l.c
+++ b/stdlib/strtol_l.c
@@ -41,7 +41,6 @@
 #include <stdlib.h>
 #include <string.h>
 #include <locale.h>
-#include <xlocale.h>
 #include <stdint.h>
 #include <bits/wordsize.h>
 
diff --git a/stdlib/strtold_l.c b/stdlib/strtold_l.c
index bef2a4d3d7..7b9efd8819 100644
--- a/stdlib/strtold_l.c
+++ b/stdlib/strtold_l.c
@@ -17,11 +17,7 @@
 
 #include <math.h>
 #include <stdlib.h>
-#include <xlocale.h>
-
-#if defined _LIBC || defined HAVE_WCHAR_H
-# include <wchar.h>
-#endif
+#include <wchar.h>
 
 #ifdef USE_WIDE_CHAR
 # define STRING_TYPE	wchar_t
diff --git a/stdlib/strtoll_l.c b/stdlib/strtoll_l.c
index 2a712eb80e..003f425db8 100644
--- a/stdlib/strtoll_l.c
+++ b/stdlib/strtoll_l.c
@@ -19,7 +19,7 @@
 
 #define QUAD	1
 
-#include <xlocale.h>
+#include <locale.h>
 
 extern long long int ____strtoll_l_internal (const char *, char **, int, int,
 					     __locale_t);
diff --git a/stdlib/strtoul_l.c b/stdlib/strtoul_l.c
index 6d23ee2964..45b0585342 100644
--- a/stdlib/strtoul_l.c
+++ b/stdlib/strtoul_l.c
@@ -19,7 +19,7 @@
 
 #define UNSIGNED	1
 
-#include <xlocale.h>
+#include <locale.h>
 
 extern unsigned long int ____strtoul_l_internal (const char *, char **, int,
 						 int, __locale_t);
diff --git a/stdlib/strtoull_l.c b/stdlib/strtoull_l.c
index 53ecb916df..da6d7cde8c 100644
--- a/stdlib/strtoull_l.c
+++ b/stdlib/strtoull_l.c
@@ -20,7 +20,7 @@
 #define QUAD		1
 #define UNSIGNED	1
 
-#include <xlocale.h>
+#include <locale.h>
 
 extern unsigned long long int ____strtoull_l_internal (const char *, char **,
 						       int, int, __locale_t);
diff --git a/string/string.h b/string/string.h
index 5aec0efe7f..fb073d0b03 100644
--- a/string/string.h
+++ b/string/string.h
@@ -148,7 +148,8 @@ extern size_t strxfrm (char *__restrict __dest,
      __THROW __nonnull ((2));
 
 #ifdef __USE_XOPEN2K8
-# include <xlocale.h>
+/* POSIX.1-2008 extended locale interface (see locale.h).  */
+# include <bits/types/locale_t.h>
 
 /* Compare the collated forms of S1 and S2, using sorting rules from L.  */
 extern int strcoll_l (const char *__s1, const char *__s2, __locale_t __l)
diff --git a/string/strings.h b/string/strings.h
index 43207af09c..53d1b5c944 100644
--- a/string/strings.h
+++ b/string/strings.h
@@ -121,7 +121,8 @@ extern int strncasecmp (const char *__s1, const char *__s2, size_t __n)
      __THROW __attribute_pure__ __nonnull ((1, 2));
 
 #ifdef	__USE_XOPEN2K8
-# include <xlocale.h>
+/* POSIX.1-2008 extended locale interface (see locale.h).  */
+# include <bits/types/locale_t.h>
 
 /* Compare S1 and S2, ignoring case, using collation rules from LOC.  */
 extern int strcasecmp_l (const char *__s1, const char *__s2, __locale_t __loc)
diff --git a/sysdeps/ieee754/ldbl-128ibm/strtold_l.c b/sysdeps/ieee754/ldbl-128ibm/strtold_l.c
index 37034cb254..341de78063 100644
--- a/sysdeps/ieee754/ldbl-128ibm/strtold_l.c
+++ b/sysdeps/ieee754/ldbl-128ibm/strtold_l.c
@@ -18,7 +18,6 @@
 #include <math.h>
 #include <stdlib.h>
 #include <wchar.h>
-#include <xlocale.h>
 
 /* The actual implementation for all floating point sizes is in strtod.c.
    These macros tell it to produce the `long double' version, `strtold'.  */
diff --git a/sysdeps/ieee754/ldbl-64-128/strtold_l.c b/sysdeps/ieee754/ldbl-64-128/strtold_l.c
index 37034cb254..341de78063 100644
--- a/sysdeps/ieee754/ldbl-64-128/strtold_l.c
+++ b/sysdeps/ieee754/ldbl-64-128/strtold_l.c
@@ -18,7 +18,6 @@
 #include <math.h>
 #include <stdlib.h>
 #include <wchar.h>
-#include <xlocale.h>
 
 /* The actual implementation for all floating point sizes is in strtod.c.
    These macros tell it to produce the `long double' version, `strtold'.  */
diff --git a/time/time.h b/time/time.h
index bb4994feee..17cc1e6614 100644
--- a/time/time.h
+++ b/time/time.h
@@ -57,7 +57,7 @@ typedef __pid_t pid_t;
 #endif
 
 #ifdef __USE_XOPEN2K8
-# include <xlocale.h>
+# include <bits/types/locale_t.h>
 #endif
 
 #ifdef __USE_ISOC11
diff --git a/wcsmbs/wchar.h b/wcsmbs/wchar.h
index accd24a03e..9054661788 100644
--- a/wcsmbs/wchar.h
+++ b/wcsmbs/wchar.h
@@ -45,6 +45,9 @@
 #if defined __USE_UNIX98 || defined __USE_XOPEN2K
 # include <bits/types/FILE.h>
 #endif
+#ifdef __USE_XOPEN2K8
+# include <bits/types/locale_t.h>
+#endif
 
 /* Tell the caller that we provide correct C++ prototypes.  */
 #if defined __cplusplus && __GNUC_PREREQ (4, 4)
@@ -116,8 +119,6 @@ extern int wcsncasecmp (const wchar_t *__s1, const wchar_t *__s2,
 
 /* Similar to the two functions above but take the information from
    the provided locale and not the global locale.  */
-# include <xlocale.h>
-
 extern int wcscasecmp_l (const wchar_t *__s1, const wchar_t *__s2,
 			 __locale_t __loc) __THROW;
 
@@ -435,23 +436,9 @@ extern unsigned long long int wcstouq (const wchar_t *__restrict __nptr,
 #endif /* Use GNU.  */
 
 #ifdef __USE_GNU
-/* The concept of one static locale per category is not very well
-   thought out.  Many applications will need to process its data using
-   information from several different locales.  Another application is
-   the implementation of the internationalization handling in the
-   upcoming ISO C++ standard library.  To support this another set of
-   the functions using locale data exist which have an additional
-   argument.
-
-   Attention: all these functions are *not* standardized in any form.
-   This is a proof-of-concept implementation.  */
-
-/* Structure for reentrant locale using functions.  This is an
-   (almost) opaque type for the user level programs.  */
-# include <xlocale.h>
-
-/* Special versions of the functions above which take the locale to
-   use as an additional parameter.  */
+/* Parallel versions of the functions above which take the locale to
+   use as an additional parameter.  These are GNU extensions inspired
+   by the POSIX.1-2008 extended locale API.  */
 extern long int wcstol_l (const wchar_t *__restrict __nptr,
 			  wchar_t **__restrict __endptr, int __base,
 			  __locale_t __loc) __THROW;
@@ -783,8 +770,6 @@ extern size_t wcsftime (wchar_t *__restrict __s, size_t __maxsize,
 			const struct tm *__restrict __tp) __THROW;
 
 # ifdef __USE_GNU
-# include <xlocale.h>
-
 /* Similar to `wcsftime' but takes the information from
    the provided locale and not the global locale.  */
 extern size_t wcsftime_l (wchar_t *__restrict __s, size_t __maxsize,
diff --git a/wcsmbs/wcstod.c b/wcsmbs/wcstod.c
index b7db11b935..72fa7eaaa4 100644
--- a/wcsmbs/wcstod.c
+++ b/wcsmbs/wcstod.c
@@ -17,7 +17,7 @@
    <http://www.gnu.org/licenses/>.  */
 
 #include <stddef.h>
-#include <xlocale.h>
+#include <locale.h>
 
 
 #define	USE_WIDE_CHAR	1
diff --git a/wcsmbs/wcstod_l.c b/wcsmbs/wcstod_l.c
index 5f7498c4f8..1d5c67cf36 100644
--- a/wcsmbs/wcstod_l.c
+++ b/wcsmbs/wcstod_l.c
@@ -18,7 +18,7 @@
    <http://www.gnu.org/licenses/>.  */
 
 #include <stddef.h>
-#include <xlocale.h>
+#include <locale.h>
 
 
 extern double ____wcstod_l_internal (const wchar_t *, wchar_t **, int,
diff --git a/wcsmbs/wcstof.c b/wcsmbs/wcstof.c
index 29cdec3a98..67c16e0cfd 100644
--- a/wcsmbs/wcstof.c
+++ b/wcsmbs/wcstof.c
@@ -17,7 +17,7 @@
    <http://www.gnu.org/licenses/>.  */
 
 #include <stddef.h>
-#include <xlocale.h>
+#include <locale.h>
 
 #define	USE_WIDE_CHAR	1
 
diff --git a/wcsmbs/wcstof_l.c b/wcsmbs/wcstof_l.c
index 23d402d7ea..d430bf1c3b 100644
--- a/wcsmbs/wcstof_l.c
+++ b/wcsmbs/wcstof_l.c
@@ -18,7 +18,7 @@
    <http://www.gnu.org/licenses/>.  */
 
 #include <stddef.h>
-#include <xlocale.h>
+#include <locale.h>
 
 
 #define	USE_WIDE_CHAR	1
diff --git a/wcsmbs/wcstold.c b/wcsmbs/wcstold.c
index e5c1cc3071..816f43bf69 100644
--- a/wcsmbs/wcstold.c
+++ b/wcsmbs/wcstold.c
@@ -17,7 +17,7 @@
    <http://www.gnu.org/licenses/>.  */
 
 #include <stddef.h>
-#include <xlocale.h>
+#include <locale.h>
 
 #define USE_WIDE_CHAR	1
 
diff --git a/wcsmbs/wcstold_l.c b/wcsmbs/wcstold_l.c
index 3dd33a729a..86f63e8801 100644
--- a/wcsmbs/wcstold_l.c
+++ b/wcsmbs/wcstold_l.c
@@ -18,7 +18,7 @@
    <http://www.gnu.org/licenses/>.  */
 
 #include <stddef.h>
-#include <xlocale.h>
+#include <locale.h>
 
 #define USE_WIDE_CHAR	1
 
diff --git a/wctype/wctype.h b/wctype/wctype.h
index 962aef1de6..7945795b44 100644
--- a/wctype/wctype.h
+++ b/wctype/wctype.h
@@ -55,8 +55,8 @@ extern wctrans_t wctrans (const char *__property) __THROW;
 extern wint_t towctrans (wint_t __wc, wctrans_t __desc) __THROW;
 
 # ifdef __USE_XOPEN2K8
-/* Declare the interface to extended locale model.  */
-#  include <xlocale.h>
+/* POSIX.1-2008 extended locale interface (see locale.h).  */
+#  include <bits/types/locale_t.h>
 
 /* Test for any wide character for which `iswalpha' or `iswdigit' is
    true.  */
-- 
2.11.0


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