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 all the uses I
checked had an autoconf test or equivalent for its existence.  It has
never been available from other C libraries, and it has always
contained a comment reading "This file is not standardized, don't rely
on it, it can go away without warning" so I think dropping it is
pretty safe.

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/xlocale.h: Rename to...
	* locale/bits/types/__locale_t.h: ...here.  Adjust commentary.
	Only define struct __locale_struct and __locale_t, not locale_t.
        * locale/bits/types/locale_t.h: New file; define locale_t here.
        * locale/Makefile (headers): Update to match.

        * include/xlocale.h: Delete wrapper.
        * include/bits/types/__locale_t.h: New 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        Correct outdated comments regarding the standardization status of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.

7 files changed, 12 insertions, 27 deletions

diff --git a/wcsmbs/wchar.h b/wcsmbs/wchar.h
index accd24a..9054661 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 b7db11b..72fa7ea 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 5f7498c..1d5c67c 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 29cdec3..67c16e0 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 23d402d..d430bf1 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 e5c1cc3..816f43b 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 3dd33a7..86f63e8 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