Post-cleanup 1: move libio.h back out of bits/.

We can't go very far with libio cleanups as long as we still have
_IO_MTSAFE_IO, and I am not tackling that in this patch series,
but we can at least make the maze of stdio-related headers a
little less complicated.

In this patch, libio.h moves back out of bits/ into the top level of
the libio subdirectory, and is merged with libio/bits/libio-ldbl.h
(which also used to be installed) and include/libio.h.  Since almost
no files include libio.h directly, this is quite straightforward.

libio.h is now always used with _LIBC defined, so all of the _LIBC ||
_GLIBCPP_USE_WCHAR_T conditionals are unnecessary.  Similarly, the
ifdef nest surrounding the definition of _IO_fwide_maybe_incompatible
can collapse down to a single SHLIB_COMPAT check.  I also took the
opportunity to add some checks for configuration botches to libio.h.

Installed stripped libraries are unchanged by this patch.

        * libio/bits/libio.h: Move back to libio/libio.h and adjust
        multiple-include guard to match.
        Merge contents of libio/bits/libio-ldbl.h and include/libio.h
        into this file.
        Remove preprocessor conditionals that are always true and/or
        redundant to other preprocessor conditionals in the same nest.
        Include shlib-compat.h unconditionally.
        Error out if _LIBC is not defined, or if _ISOMAC is defined,
        or if _IO_MTSAFE_IO is defined but _IO_lock_t_defined is not
        defined after including stdio.h.
        Use __BEGIN_DECLS/__END_DECLS.

        * libio/bits/libio-ldbl.h, include/bits/libio.h: Delete file.
        * include/stdio.h, libio/iolibio.h, libio/libioP.h: Include
        libio.h as <libio/libio.h> rather than as <bits/libio.h>.

2 files changed, 0 insertions, 404 deletions

diff --git a/libio/bits/libio-ldbl.h b/libio/bits/libio-ldbl.h
deleted file mode 100644
index aa39353ca5..0000000000
--- a/libio/bits/libio-ldbl.h
+++ /dev/null
@@ -1,29 +0,0 @@
-/* -mlong-double-64 compatibility mode for libio functions.
-   Copyright (C) 2006-2018 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_LIBIO_LDBL_H
-#define _BITS_LIBIO_LDBL_H 1
-
-#ifndef _BITS_LIBIO_H
-# error "Never include <bits/libio-ldbl.h> directly; use <libio.h> instead."
-#endif
-
-__LDBL_REDIR_DECL (_IO_vfscanf)
-__LDBL_REDIR_DECL (_IO_vfprintf)
-
-#endif
diff --git a/libio/bits/libio.h b/libio/bits/libio.h
deleted file mode 100644
index cefc2c855b..0000000000
--- a/libio/bits/libio.h
+++ /dev/null
@@ -1,375 +0,0 @@
-/* Copyright (C) 1991-2018 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-   Written by Per Bothner <bothner@cygnus.com>.
-
-   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/>.
-
-   As a special exception, if you link the code in this file with
-   files compiled with a GNU compiler to produce an executable,
-   that does not cause the resulting executable to be covered by
-   the GNU Lesser General Public License.  This exception does not
-   however invalidate any other reasons why the executable file
-   might be covered by the GNU Lesser General Public License.
-   This exception applies to code released by its copyright holders
-   in files containing the exception.  */
-
-#ifndef _BITS_LIBIO_H
-#define _BITS_LIBIO_H 1
-
-#include <stdio.h>
-
-#include <bits/_G_config.h>
-/* ALL of these should be defined in _G_config.h */
-#define _IO_fpos_t __fpos_t
-#define _IO_fpos64_t __fpos64_t
-#define _IO_size_t size_t
-#define _IO_ssize_t __ssize_t
-#define _IO_off_t __off_t
-#define _IO_off64_t __off64_t
-#define _IO_pid_t __pid_t
-#define _IO_uid_t __uid_t
-#define _IO_iconv_t _G_iconv_t
-#define _IO_HAVE_ST_BLKSIZE _G_HAVE_ST_BLKSIZE
-#define _IO_BUFSIZ BUFSIZ
-#define _IO_wint_t wint_t
-#define _IO_va_list __gnuc_va_list
-
-/* compatibility defines */
-#define _STDIO_USES_IOSTREAM
-#define _IO_UNIFIED_JUMPTABLES 1
-#define __HAVE_COLUMN
-#define _IO_file_flags _flags
-
-/* open modes */
-#define _IOS_INPUT	1
-#define _IOS_OUTPUT	2
-#define _IOS_ATEND	4
-#define _IOS_APPEND	8
-#define _IOS_TRUNC	16
-#define _IOS_NOCREATE	32
-#define _IOS_NOREPLACE	64
-#define _IOS_BIN	128
-
-/* Magic numbers and bits for the _flags field.
-   The magic numbers use the high-order bits of _flags;
-   the remaining bits are available for variable flags.
-   Note: The magic numbers must all be negative if stdio
-   emulation is desired. */
-
-#define _IO_MAGIC 0xFBAD0000 /* Magic number */
-#define _OLD_STDIO_MAGIC 0xFABC0000 /* Emulate old stdio. */
-#define _IO_MAGIC_MASK 0xFFFF0000
-#define _IO_USER_BUF 1 /* User owns buffer; don't delete it on close. */
-#define _IO_UNBUFFERED 2
-#define _IO_NO_READS 4 /* Reading not allowed */
-#define _IO_NO_WRITES 8 /* Writing not allowd */
-#define _IO_EOF_SEEN 0x10
-#define _IO_ERR_SEEN 0x20
-#define _IO_DELETE_DONT_CLOSE 0x40 /* Don't call close(_fileno) on cleanup. */
-#define _IO_LINKED 0x80 /* Set if linked (using _chain) to streambuf::_list_all.*/
-#define _IO_IN_BACKUP 0x100
-#define _IO_LINE_BUF 0x200
-#define _IO_TIED_PUT_GET 0x400 /* Set if put and get pointer logicly tied. */
-#define _IO_CURRENTLY_PUTTING 0x800
-#define _IO_IS_APPENDING 0x1000
-#define _IO_IS_FILEBUF 0x2000
-#define _IO_BAD_SEEN 0x4000
-#define _IO_USER_LOCK 0x8000
-
-#define _IO_FLAGS2_MMAP 1
-#define _IO_FLAGS2_NOTCANCEL 2
-#ifdef _LIBC
-# define _IO_FLAGS2_FORTIFY 4
-#endif
-#define _IO_FLAGS2_USER_WBUF 8
-#ifdef _LIBC
-# define _IO_FLAGS2_SCANF_STD 16
-# define _IO_FLAGS2_NOCLOSE 32
-# define _IO_FLAGS2_CLOEXEC 64
-# define _IO_FLAGS2_NEED_LOCK 128
-#endif
-
-/* These are "formatting flags" matching the iostream fmtflags enum values. */
-#define _IO_SKIPWS 01
-#define _IO_LEFT 02
-#define _IO_RIGHT 04
-#define _IO_INTERNAL 010
-#define _IO_DEC 020
-#define _IO_OCT 040
-#define _IO_HEX 0100
-#define _IO_SHOWBASE 0200
-#define _IO_SHOWPOINT 0400
-#define _IO_UPPERCASE 01000
-#define _IO_SHOWPOS 02000
-#define _IO_SCIENTIFIC 04000
-#define _IO_FIXED 010000
-#define _IO_UNITBUF 020000
-#define _IO_STDIO 040000
-#define _IO_DONT_CLOSE 0100000
-#define _IO_BOOLALPHA 0200000
-
-
-struct _IO_jump_t;
-
-/* A streammarker remembers a position in a buffer. */
-
-struct _IO_marker {
-  struct _IO_marker *_next;
-  struct _IO_FILE *_sbuf;
-  /* If _pos >= 0
- it points to _buf->Gbase()+_pos. FIXME comment */
-  /* if _pos < 0, it points to _buf->eBptr()+_pos. FIXME comment */
-  int _pos;
-};
-
-/* This is the structure from the libstdc++ codecvt class.  */
-enum __codecvt_result
-{
-  __codecvt_ok,
-  __codecvt_partial,
-  __codecvt_error,
-  __codecvt_noconv
-};
-
-#if defined _LIBC || defined _GLIBCPP_USE_WCHAR_T
-/* The order of the elements in the following struct must match the order
-   of the virtual functions in the libstdc++ codecvt class.  */
-struct _IO_codecvt
-{
-  void (*__codecvt_destr) (struct _IO_codecvt *);
-  enum __codecvt_result (*__codecvt_do_out) (struct _IO_codecvt *,
-					     __mbstate_t *,
-					     const wchar_t *,
-					     const wchar_t *,
-					     const wchar_t **, char *,
-					     char *, char **);
-  enum __codecvt_result (*__codecvt_do_unshift) (struct _IO_codecvt *,
-						 __mbstate_t *, char *,
-						 char *, char **);
-  enum __codecvt_result (*__codecvt_do_in) (struct _IO_codecvt *,
-					    __mbstate_t *,
-					    const char *, const char *,
-					    const char **, wchar_t *,
-					    wchar_t *, wchar_t **);
-  int (*__codecvt_do_encoding) (struct _IO_codecvt *);
-  int (*__codecvt_do_always_noconv) (struct _IO_codecvt *);
-  int (*__codecvt_do_length) (struct _IO_codecvt *, __mbstate_t *,
-			      const char *, const char *, _IO_size_t);
-  int (*__codecvt_do_max_length) (struct _IO_codecvt *);
-
-  _IO_iconv_t __cd_in;
-  _IO_iconv_t __cd_out;
-};
-
-/* Extra data for wide character streams.  */
-struct _IO_wide_data
-{
-  wchar_t *_IO_read_ptr;	/* Current read pointer */
-  wchar_t *_IO_read_end;	/* End of get area. */
-  wchar_t *_IO_read_base;	/* Start of putback+get area. */
-  wchar_t *_IO_write_base;	/* Start of put area. */
-  wchar_t *_IO_write_ptr;	/* Current put pointer. */
-  wchar_t *_IO_write_end;	/* End of put area. */
-  wchar_t *_IO_buf_base;	/* Start of reserve area. */
-  wchar_t *_IO_buf_end;		/* End of reserve area. */
-  /* The following fields are used to support backing up and undo. */
-  wchar_t *_IO_save_base;	/* Pointer to start of non-current get area. */
-  wchar_t *_IO_backup_base;	/* Pointer to first valid character of
-				   backup area */
-  wchar_t *_IO_save_end;	/* Pointer to end of non-current get area. */
-
-  __mbstate_t _IO_state;
-  __mbstate_t _IO_last_state;
-  struct _IO_codecvt _codecvt;
-
-  wchar_t _shortbuf[1];
-
-  const struct _IO_jump_t *_wide_vtable;
-};
-#endif
-
-
-#ifndef __cplusplus
-typedef struct _IO_FILE _IO_FILE;
-#endif
-
-struct _IO_FILE_plus;
-
-extern struct _IO_FILE_plus _IO_2_1_stdin_;
-extern struct _IO_FILE_plus _IO_2_1_stdout_;
-extern struct _IO_FILE_plus _IO_2_1_stderr_;
-#ifndef _LIBC
-#define _IO_stdin ((_IO_FILE*)(&_IO_2_1_stdin_))
-#define _IO_stdout ((_IO_FILE*)(&_IO_2_1_stdout_))
-#define _IO_stderr ((_IO_FILE*)(&_IO_2_1_stderr_))
-#else
-extern _IO_FILE *_IO_stdin attribute_hidden;
-extern _IO_FILE *_IO_stdout attribute_hidden;
-extern _IO_FILE *_IO_stderr attribute_hidden;
-#endif
-
-
-/* Compatibility names for cookie I/O functions.  */
-#ifdef __USE_GNU
-typedef cookie_read_function_t __io_read_fn;
-typedef cookie_write_function_t __io_write_fn;
-typedef cookie_seek_function_t __io_seek_fn;
-typedef cookie_close_function_t __io_close_fn;
-typedef cookie_io_functions_t _IO_cookie_io_functions_t;
-
-struct _IO_cookie_file;
-
-/* Initialize one of those.  */
-extern void _IO_cookie_init (struct _IO_cookie_file *__cfile, int __read_write,
-			     void *__cookie, _IO_cookie_io_functions_t __fns);
-#endif
-
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-extern int __underflow (_IO_FILE *);
-#if defined _LIBC || defined _GLIBCPP_USE_WCHAR_T
-extern _IO_wint_t __wunderflow (_IO_FILE *);
-extern _IO_wint_t __wuflow (_IO_FILE *);
-extern _IO_wint_t __woverflow (_IO_FILE *, _IO_wint_t);
-#endif
-
-#if  __GNUC__ >= 3
-# define _IO_BE(expr, res) __builtin_expect ((expr), res)
-#else
-# define _IO_BE(expr, res) (expr)
-#endif
-
-#define _IO_getc_unlocked(_fp) __getc_unlocked_body (_fp)
-#define _IO_peekc_unlocked(_fp) \
-       (_IO_BE ((_fp)->_IO_read_ptr >= (_fp)->_IO_read_end, 0) \
-	  && __underflow (_fp) == EOF ? EOF \
-	: *(unsigned char *) (_fp)->_IO_read_ptr)
-#define _IO_putc_unlocked(_ch, _fp) __putc_unlocked_body (_ch, _fp)
-
-#if defined _LIBC || defined _GLIBCPP_USE_WCHAR_T
-# define _IO_getwc_unlocked(_fp) \
-  (_IO_BE ((_fp)->_wide_data == NULL					\
-	   || ((_fp)->_wide_data->_IO_read_ptr				\
-	       >= (_fp)->_wide_data->_IO_read_end), 0)			\
-   ? __wuflow (_fp) : (_IO_wint_t) *(_fp)->_wide_data->_IO_read_ptr++)
-# define _IO_putwc_unlocked(_wch, _fp) \
-  (_IO_BE ((_fp)->_wide_data == NULL					\
-	   || ((_fp)->_wide_data->_IO_write_ptr				\
-	       >= (_fp)->_wide_data->_IO_write_end), 0)			\
-   ? __woverflow (_fp, _wch)						\
-   : (_IO_wint_t) (*(_fp)->_wide_data->_IO_write_ptr++ = (_wch)))
-#endif
-
-#define _IO_feof_unlocked(_fp) __feof_unlocked_body (_fp)
-#define _IO_ferror_unlocked(_fp) __ferror_unlocked_body (_fp)
-
-extern int _IO_getc (_IO_FILE *__fp);
-extern int _IO_putc (int __c, _IO_FILE *__fp);
-extern int _IO_feof (_IO_FILE *__fp) __THROW;
-extern int _IO_ferror (_IO_FILE *__fp) __THROW;
-
-extern int _IO_peekc_locked (_IO_FILE *__fp);
-
-/* This one is for Emacs. */
-#define _IO_PENDING_OUTPUT_COUNT(_fp)	\
-	((_fp)->_IO_write_ptr - (_fp)->_IO_write_base)
-
-extern void _IO_flockfile (_IO_FILE *) __THROW;
-extern void _IO_funlockfile (_IO_FILE *) __THROW;
-extern int _IO_ftrylockfile (_IO_FILE *) __THROW;
-
-#define _IO_peekc(_fp) _IO_peekc_unlocked (_fp)
-#define _IO_flockfile(_fp) /**/
-#define _IO_funlockfile(_fp) /**/
-#define _IO_ftrylockfile(_fp) /**/
-#ifndef _IO_cleanup_region_start
-#define _IO_cleanup_region_start(_fct, _fp) /**/
-#endif
-#ifndef _IO_cleanup_region_end
-#define _IO_cleanup_region_end(_Doit) /**/
-#endif
-
-#define _IO_need_lock(_fp) \
-  (((_fp)->_flags2 & _IO_FLAGS2_NEED_LOCK) != 0)
-
-extern int _IO_vfscanf (_IO_FILE * __restrict, const char * __restrict,
-			_IO_va_list, int *__restrict);
-extern int _IO_vfprintf (_IO_FILE *__restrict, const char *__restrict,
-			 _IO_va_list);
-extern _IO_ssize_t _IO_padn (_IO_FILE *, int, _IO_ssize_t);
-extern _IO_size_t _IO_sgetn (_IO_FILE *, void *, _IO_size_t);
-
-extern _IO_off64_t _IO_seekoff (_IO_FILE *, _IO_off64_t, int, int);
-extern _IO_off64_t _IO_seekpos (_IO_FILE *, _IO_off64_t, int);
-
-extern void _IO_free_backup_area (_IO_FILE *) __THROW;
-
-#if defined _LIBC || defined _GLIBCPP_USE_WCHAR_T
-extern _IO_wint_t _IO_getwc (_IO_FILE *__fp);
-extern _IO_wint_t _IO_putwc (wchar_t __wc, _IO_FILE *__fp);
-extern int _IO_fwide (_IO_FILE *__fp, int __mode) __THROW;
-# if __GNUC__ >= 2
-/* While compiling glibc we have to handle compatibility with very old
-   versions.  */
-#  if defined _LIBC && defined SHARED
-#   include <shlib-compat.h>
-#   if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_1)
-#    define _IO_fwide_maybe_incompatible \
-  (__builtin_expect (&_IO_stdin_used == NULL, 0))
-extern const int _IO_stdin_used;
-weak_extern (_IO_stdin_used);
-#   endif
-#  endif
-#  ifndef _IO_fwide_maybe_incompatible
-#   define _IO_fwide_maybe_incompatible (0)
-#  endif
-/* A special optimized version of the function above.  It optimizes the
-   case of initializing an unoriented byte stream.  */
-#  define _IO_fwide(__fp, __mode) \
-  ({ int __result = (__mode);						      \
-     if (__result < 0 && ! _IO_fwide_maybe_incompatible)		      \
-       {								      \
-	 if ((__fp)->_mode == 0)					      \
-	   /* We know that all we have to do is to set the flag.  */	      \
-	   (__fp)->_mode = -1;						      \
-	 __result = (__fp)->_mode;					      \
-       }								      \
-     else if (__builtin_constant_p (__mode) && (__mode) == 0)		      \
-       __result = _IO_fwide_maybe_incompatible ? -1 : (__fp)->_mode;	      \
-     else								      \
-       __result = _IO_fwide (__fp, __result);				      \
-     __result; })
-# endif
-
-extern int _IO_vfwscanf (_IO_FILE * __restrict, const wchar_t * __restrict,
-			 _IO_va_list, int *__restrict);
-extern int _IO_vfwprintf (_IO_FILE *__restrict, const wchar_t *__restrict,
-			  _IO_va_list);
-extern _IO_ssize_t _IO_wpadn (_IO_FILE *, wint_t, _IO_ssize_t);
-extern void _IO_free_wbackup_area (_IO_FILE *) __THROW;
-#endif
-
-#ifdef __LDBL_COMPAT
-# include <bits/libio-ldbl.h>
-#endif
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif /* _BITS_LIBIO_H */