Remove __need macros from stdio.h and wchar.h.

wint_t is a little finicky because it might be defined by stddef.h, which
belongs to the compiler.

In addition to the _types_, a bunch of other declarations shared between
wctype.h and wchar.h are factored out to their own header.

	* libio/bits/types/FILE.h, libio/bits/types/__FILE.h
	* wcsmbs/bits/types/mbstate_t.h, wcsmbs/bits/types/__mbstate_t.h
	* wcsmbs/bits/types/wint_t.h: New single-type definition files.
	* wctype/bits/wctype-wchar.h: New file holding declarations shared
	between wctype.h and wchar.h.

	* libio/Makefile, wcsmbs/Makefile, wctype/Makefile:
	Install them.

	* include/bits/types/FILE.h, include/bits/types/__FILE.h
	* include/bits/types/mbstate_t.h, include/bits/types/__mbstate_t.h
	* include/bits/types/wint_t.h, include/bits/wcsmbs-wchar.h:
	New wrappers.
	* include/stdio.h, include/wchar.h, include/wctype.h:
	No need to handle __need macros.

	* grp/grp.h, gshadow/gshadow.h, hurd/hurd.h, iconv/gconv.h
	* libio/stdio.h, mach/mach.h, misc/mntent.h, pwd/pwd.h
	* shadow/shadow.h, stdio-common/printf.h, wcsmbs/uchar.h
	* wcsmbs/wchar.h, wctype/wctype.h
	* sysdeps/generic/_G_config.h, sysdeps/unix/sysv/linux/_G_config.h
	Use the new files instead of __need macros.

6 files changed, 85 insertions, 100 deletions

diff --git a/wcsmbs/Makefile b/wcsmbs/Makefile
index d6b214b2ab..08b1de11a8 100644
--- a/wcsmbs/Makefile
+++ b/wcsmbs/Makefile
@@ -22,7 +22,8 @@ subdir	:= wcsmbs
 
 include ../Makeconfig
 
-headers	:= wchar.h bits/wchar.h bits/wchar2.h bits/wchar-ldbl.h uchar.h
+headers	:= wchar.h bits/wchar.h bits/wchar2.h bits/wchar-ldbl.h uchar.h \
+	   bits/types/__mbstate_t.h bits/types/mbstate_t.h bits/types/wint_t.h
 
 routines := wcscat wcschr wcscmp wcscpy wcscspn wcsdup wcslen wcsncat \
 	    wcsncmp wcsncpy wcspbrk wcsrchr wcsspn wcstok wcsstr wmemchr \
diff --git a/wcsmbs/bits/types/__mbstate_t.h b/wcsmbs/bits/types/__mbstate_t.h
new file mode 100644
index 0000000000..1d8a4e28d1
--- /dev/null
+++ b/wcsmbs/bits/types/__mbstate_t.h
@@ -0,0 +1,23 @@
+#ifndef ____mbstate_t_defined
+#define ____mbstate_t_defined 1
+
+/* Integral type unchanged by default argument promotions that can
+   hold any value corresponding to members of the extended character
+   set, as well as at least one value that does not correspond to any
+   member of the extended character set.  */
+#ifndef __WINT_TYPE__
+# define __WINT_TYPE__ unsigned int
+#endif
+
+/* Conversion state information.  */
+typedef struct
+{
+  int __count;
+  union
+  {
+    __WINT_TYPE__ __wch;
+    char __wchb[4];
+  } __value;		/* Value so far.  */
+} __mbstate_t;
+
+#endif
diff --git a/wcsmbs/bits/types/mbstate_t.h b/wcsmbs/bits/types/mbstate_t.h
new file mode 100644
index 0000000000..8d1baa5c3b
--- /dev/null
+++ b/wcsmbs/bits/types/mbstate_t.h
@@ -0,0 +1,8 @@
+#ifndef __mbstate_t_defined
+#define __mbstate_t_defined 1
+
+#include <bits/types/__mbstate_t.h>
+
+typedef __mbstate_t mbstate_t;
+
+#endif
diff --git a/wcsmbs/bits/types/wint_t.h b/wcsmbs/bits/types/wint_t.h
new file mode 100644
index 0000000000..fbd63dbc84
--- /dev/null
+++ b/wcsmbs/bits/types/wint_t.h
@@ -0,0 +1,23 @@
+#ifndef __wint_t_defined
+#define __wint_t_defined 1
+
+/* Some versions of stddef.h provide wint_t, even though neither the
+   C nor C++ standards, nor POSIX, specifies this.  We assume that
+   stddef.h will define the macro _WINT_T if and only if it provides
+   wint_t, and conversely, that it will avoid providing wint_t if
+   _WINT_T is already defined.  */
+#ifndef _WINT_T
+#define _WINT_T 1
+
+/* Integral type unchanged by default argument promotions that can
+   hold any value corresponding to members of the extended character
+   set, as well as at least one value that does not correspond to any
+   member of the extended character set.  */
+#ifndef __WINT_TYPE__
+# define __WINT_TYPE__ unsigned int
+#endif
+
+typedef __WINT_TYPE__ wint_t;
+
+#endif /* _WINT_T */
+#endif /* bits/types/wint_t.h */
diff --git a/wcsmbs/uchar.h b/wcsmbs/uchar.h
index a6569825fd..f937519cf4 100644
--- a/wcsmbs/uchar.h
+++ b/wcsmbs/uchar.h
@@ -27,15 +27,8 @@
 
 #define __need_size_t
 #include <stddef.h>
-#define __need_mbstate_t
-#include <wchar.h>
-
-#ifndef __mbstate_t_defined
-/* Public type.  */
-typedef __mbstate_t mbstate_t;
-# define __mbstate_t_defined 1
-#endif
 
+#include <bits/types/mbstate_t.h>
 
 #if defined __GNUC__ && !defined __USE_ISOCXX11
 /* Define the 16-bit and 32-bit character types.  Use the information
diff --git a/wcsmbs/wchar.h b/wcsmbs/wchar.h
index 79be9fc41d..d389428daa 100644
--- a/wcsmbs/wchar.h
+++ b/wcsmbs/wchar.h
@@ -21,82 +21,32 @@
  */
 
 #ifndef _WCHAR_H
+#define _WCHAR_H 1
 
-#if !defined __need_mbstate_t && !defined __need_wint_t
-# define _WCHAR_H 1
-# define __GLIBC_INTERNAL_STARTING_HEADER_IMPLEMENTATION
-# include <bits/libc-header-start.h>
-#endif
+#define __GLIBC_INTERNAL_STARTING_HEADER_IMPLEMENTATION
+#include <bits/libc-header-start.h>
 
-#ifdef _WCHAR_H
-/* Get FILE definition.  */
-# define __need___FILE
-# if defined __USE_UNIX98 || defined __USE_XOPEN2K
-#  define __need_FILE
-# endif
-# include <stdio.h>
-/* Get va_list definition.  */
-# define __need___va_list
-# include <stdarg.h>
+#define __need_size_t
+#define __need_wchar_t
+#define __need_NULL
+#include <stddef.h>
 
-# include <bits/wchar.h>
+#define __need___va_list
+#include <stdarg.h>
 
-/* Get size_t, wchar_t, wint_t and NULL from <stddef.h>.  */
-# define __need_size_t
-# define __need_wchar_t
-# define __need_NULL
-#endif
-#if defined _WCHAR_H || defined __need_wint_t || !defined __WINT_TYPE__
-# undef __need_wint_t
-# define __need_wint_t
-# include <stddef.h>
-
-/* We try to get wint_t from <stddef.h>, but not all GCC versions define it
-   there.  So define it ourselves if it remains undefined.  */
-# ifndef _WINT_T
-/* Integral type unchanged by default argument promotions that can
-   hold any value corresponding to members of the extended character
-   set, as well as at least one value that does not correspond to any
-   member of the extended character set.  */
-#  define _WINT_T
-typedef unsigned int wint_t;
-# endif
+#include <bits/wchar.h>
+#include <bits/types/wint_t.h>
+#include <bits/types/mbstate_t.h>
+#include <bits/types/__FILE.h>
 
-/* Tell the caller that we provide correct C++ prototypes.  */
-# if defined __cplusplus && __GNUC_PREREQ (4, 4)
-#  define __CORRECT_ISO_CPP_WCHAR_H_PROTO
-# endif
+#if defined __USE_UNIX98 || defined __USE_XOPEN2K
+# include <bits/types/FILE.h>
 #endif
 
-#if (defined _WCHAR_H || defined __need_mbstate_t) && !defined ____mbstate_t_defined
-# define ____mbstate_t_defined	1
-/* Conversion state information.  */
-typedef struct
-{
-  int __count;
-  union
-  {
-# ifdef __WINT_TYPE__
-    __WINT_TYPE__ __wch;
-# else
-    wint_t __wch;
-# endif
-    char __wchb[4];
-  } __value;		/* Value so far.  */
-} __mbstate_t;
+/* Tell the caller that we provide correct C++ prototypes.  */
+#if defined __cplusplus && __GNUC_PREREQ (4, 4)
+# define __CORRECT_ISO_CPP_WCHAR_H_PROTO
 #endif
-#undef __need_mbstate_t
-
-
-/* The rest of the file is only used if used if __need_mbstate_t is not
-   defined.  */
-#ifdef _WCHAR_H
-
-# ifndef __mbstate_t_defined
-/* Public type.  */
-typedef __mbstate_t mbstate_t;
-#  define __mbstate_t_defined 1
-# endif
 
 #ifndef WCHAR_MIN
 /* These constants might also be defined in <inttypes.h>.  */
@@ -108,13 +58,18 @@ typedef __mbstate_t mbstate_t;
 # define WEOF (0xffffffffu)
 #endif
 
-/* For XPG4 compliance we have to define the stuff from <wctype.h> here
-   as well.  */
-#if defined __USE_XOPEN && !defined __USE_UNIX98
-# include <wctype.h>
+/* All versions of XPG prior to the publication of ISO C99 required
+   the bulk of <wctype.h>'s declarations to appear in this header
+   (because <wctype.h> did not exist prior to C99).  In POSIX.1-2001
+   those declarations were marked as XSI extensions; in -2008 they
+   were additionally marked as obsolescent.  _GNU_SOURCE mode
+   anticipates the removal of these declarations in the next revision
+   of POSIX.  */
+#if (defined __USE_XOPEN && !defined __USE_GNU \
+     && !(defined __USE_XOPEN2K && !defined __USE_XOPEN2KXSI))
+# include <bits/wctype-wchar.h>
 #endif
 
-
 __BEGIN_DECLS
 
 /* This incomplete type is defined in <time.h> but needed here because
@@ -823,17 +778,6 @@ extern size_t wcsftime_l (wchar_t *__restrict __s, size_t __maxsize,
 			  __locale_t __loc) __THROW;
 # endif
 
-/* The X/Open standard demands that most of the functions defined in
-   the <wctype.h> header must also appear here.  This is probably
-   because some X/Open members wrote their implementation before the
-   ISO C standard was published and introduced the better solution.
-   We have to provide these definitions for compliance reasons but we
-   do this nonsense only if really necessary.  */
-#if defined __USE_UNIX98 && !defined __USE_GNU
-# define __need_iswxxx
-# include <wctype.h>
-#endif
-
 /* Define some macros helping to catch buffer overflows.  */
 #if __USE_FORTIFY_LEVEL > 0 && defined __fortify_function
 # include <bits/wchar2.h>
@@ -845,11 +789,4 @@ extern size_t wcsftime_l (wchar_t *__restrict __s, size_t __maxsize,
 
 __END_DECLS
 
-#endif	/* _WCHAR_H defined */
-
 #endif /* wchar.h  */
-
-/* Undefine all __need_* constants in case we are included to get those
-   constants but the whole file was already read.  */
-#undef __need_mbstate_t
-#undef __need_wint_t