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        Correct outdated comments regarding the standardization status of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.

9 files changed, 13 insertions, 30 deletions

diff --git a/stdlib/monetary.h b/stdlib/monetary.h
index dcfbfc5..c1fcbf0 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 6f1e70e..ce2602e 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.
-
-   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.  */
+/* 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>
+
 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 99c2af3..a782a24 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 57e5575..ea76c34 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 5a0683b..48e9ab5 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 bef2a4d..7b9efd8 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 2a712eb..003f425 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 6d23ee2..45b0585 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 53ecb91..da6d7cd 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);