Remove legacy configuration knobs from libio.

This patch eliminates the "compatibility defines"
_IO_UNIFIED_JUMPTABLES (always defined to 1, used in a number of #ifs
which are therefore always false), _STDIO_USES_IOSTREAM (unused),
__HAVE_COLUMN (unused), _IO_BE (replaced with __glibc_unlikely), and
yet another redundant definition of EOF.

Installed stripped libraries are unchanged by this patch.

	* libio/libio.h (_IO_UNIFIED_JUMPTABLES, _STDIO_USES_IOSTREAM)
	(__HAVE_COLUMN, _IO_BE): Don't define.
	(_IO_peekc_unlocked, _IO_getwc_unlocked, _IO_putwc_unlocked)
	(_IO_fwide_maybe_incompatible): Use __glibc_unlikely.
	* libio/libioP.h (EOF): Don't define.
	* libio/iofdopen.c, libio/iofopen.c, libio/iopopen.c
	* libio/iovdprintf.c, libio/oldiofdopen.c, libio/oldiofopen.c
	* libio/oldiopopen.c, debug/vdprintf_chk.c: Remove #if block
	testing _IO_UNIFIED_JUMPTABLES.

ChangeLog

@@ -1,5 +1,15 @@
 2018-02-21  Zack Weinberg  <zackw@panix.com>
 
+	* libio/libio.h (_IO_UNIFIED_JUMPTABLES, _STDIO_USES_IOSTREAM)
+	(__HAVE_COLUMN, _IO_BE): Don't define.
+	(_IO_peekc_unlocked, _IO_getwc_unlocked, _IO_putwc_unlocked)
+	(_IO_fwide_maybe_incompatible): Use __glibc_unlikely.
+	* libio/libioP.h (EOF): Don't define.
+	* libio/iofdopen.c, libio/iofopen.c, libio/iopopen.c
+	* libio/iovdprintf.c, libio/oldiofdopen.c, libio/oldiofopen.c
+	* libio/oldiopopen.c, debug/vdprintf_chk.c: Remove #if block
+	testing _IO_UNIFIED_JUMPTABLES.
+
 	* libio/libio.h (_IO_FILE): Delete; all uses changed to FILE.
 	(_IO_fpos_t): Delete; all uses changed to __fpos_t.
 	(_IO_fpos64_t): Delete; all uses changed to __fpos64_t.

debug/vdprintf_chk.c

@@ -40,9 +40,6 @@ __vdprintf_chk (int d, int flags, const char *format, va_list arg)
   _IO_no_init (&tmpfil.file, _IO_USER_LOCK, 0, &wd, &_IO_wfile_jumps);
   _IO_JUMPS (&tmpfil) = &_IO_file_jumps;
   _IO_new_file_init_internal (&tmpfil);
-#if  !_IO_UNIFIED_JUMPTABLES
-  tmpfil.vtable = NULL;
-#endif
   if (_IO_file_attach (&tmpfil.file, d) == NULL)
     {
       _IO_un_link (&tmpfil);

libio/iofdopen.c

@@ -137,9 +137,6 @@ _IO_new_fdopen (int fd, const char *mode)
 #endif
       &_IO_file_jumps;
   _IO_new_file_init_internal (&new_f->fp);
-#if  !_IO_UNIFIED_JUMPTABLES
-  new_f->fp.vtable = NULL;
-#endif
   /* We only need to record the fd because _IO_file_init_internal will
      have unset the offset.  It is important to unset the cached
      offset because the real offset in the file could change between

libio/iofopen.c

@@ -72,9 +72,6 @@ __fopen_internal (const char *filename, const char *mode, int is32)
   _IO_no_init (&new_f->fp.file, 0, 0, &new_f->wd, &_IO_wfile_jumps);
   _IO_JUMPS (&new_f->fp) = &_IO_file_jumps;
   _IO_new_file_init_internal (&new_f->fp);
-#if  !_IO_UNIFIED_JUMPTABLES
-  new_f->fp.vtable = NULL;
-#endif
   if (_IO_file_fopen ((FILE *) new_f, filename, mode, is32) != NULL)
     return __fopen_maybe_mmap (&new_f->fp.file);
 

libio/iopopen.c

@@ -200,9 +200,6 @@ _IO_new_popen (const char *command, const char *mode)
   _IO_init_internal (fp, 0);
   _IO_JUMPS (&new_f->fpx.file) = &_IO_proc_jumps;
   _IO_new_file_init_internal (&new_f->fpx.file);
-#if  !_IO_UNIFIED_JUMPTABLES
-  new_f->fpx.file.vtable = NULL;
-#endif
   if (_IO_new_proc_open (fp, command, mode) != NULL)
     return (FILE *) &new_f->fpx.file;
   _IO_un_link (&new_f->fpx.file);

libio/iovdprintf.c

@@ -40,9 +40,6 @@ _IO_vdprintf (int d, const char *format, va_list arg)
   _IO_no_init (&tmpfil.file, _IO_USER_LOCK, 0, &wd, &_IO_wfile_jumps);
   _IO_JUMPS (&tmpfil) = &_IO_file_jumps;
   _IO_new_file_init_internal (&tmpfil);
-#if  !_IO_UNIFIED_JUMPTABLES
-  tmpfil.vtable = NULL;
-#endif
   if (_IO_file_attach (&tmpfil.file, d) == NULL)
     {
       _IO_un_link (&tmpfil);

libio/libio.h

@@ -61,9 +61,6 @@ typedef union
 #include <shlib-compat.h>
 
 /* compatibility defines */
-#define _STDIO_USES_IOSTREAM
-#define _IO_UNIFIED_JUMPTABLES 1
-#define __HAVE_COLUMN
 #define _IO_file_flags _flags
 
 /* open modes */
@@ -228,28 +225,23 @@ extern wint_t __wunderflow (FILE *);
 extern wint_t __wuflow (FILE *);
 extern wint_t __woverflow (FILE *, wint_t);
 
-#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) \
+#define _IO_peekc_unlocked(_fp)						\
-       (_IO_BE ((_fp)->_IO_read_ptr >= (_fp)->_IO_read_end, 0) \
+  (__glibc_unlikely ((_fp)->_IO_read_ptr >= (_fp)->_IO_read_end)	\
-	  && __underflow (_fp) == EOF ? EOF \
+   && __underflow (_fp) == EOF						\
-	: *(unsigned char *) (_fp)->_IO_read_ptr)
+   ? EOF								\
+   : *(unsigned char *) (_fp)->_IO_read_ptr)
 #define _IO_putc_unlocked(_ch, _fp) __putc_unlocked_body (_ch, _fp)
 
-# define _IO_getwc_unlocked(_fp) \
+# define _IO_getwc_unlocked(_fp)					\
-  (_IO_BE ((_fp)->_wide_data == NULL					\
+  (__glibc_unlikely ((_fp)->_wide_data == NULL				\
-	   || ((_fp)->_wide_data->_IO_read_ptr				\
+		     || ((_fp)->_wide_data->_IO_read_ptr		\
-	       >= (_fp)->_wide_data->_IO_read_end), 0)			\
+			 >= (_fp)->_wide_data->_IO_read_end))		\
    ? __wuflow (_fp) : (wint_t) *(_fp)->_wide_data->_IO_read_ptr++)
-# define _IO_putwc_unlocked(_wch, _fp) \
+# define _IO_putwc_unlocked(_wch, _fp)					\
-  (_IO_BE ((_fp)->_wide_data == NULL					\
+  (__glibc_unlikely ((_fp)->_wide_data == NULL				\
-	   || ((_fp)->_wide_data->_IO_write_ptr				\
+		     || ((_fp)->_wide_data->_IO_write_ptr		\
-	       >= (_fp)->_wide_data->_IO_write_end), 0)			\
+			 >= (_fp)->_wide_data->_IO_write_end))		\
    ? __woverflow (_fp, _wch)						\
    : (wint_t) (*(_fp)->_wide_data->_IO_write_ptr++ = (_wch)))
 
@@ -304,7 +296,7 @@ extern int _IO_fwide (FILE *__fp, int __mode) __THROW;
 
 #if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_1)
 #  define _IO_fwide_maybe_incompatible \
-  (__builtin_expect (&_IO_stdin_used == NULL, 0))
+  (__glibc_unlikely (&_IO_stdin_used == NULL))
 extern const int _IO_stdin_used;
 weak_extern (_IO_stdin_used);
 #else

libio/libioP.h

@@ -690,10 +690,6 @@ extern off64_t _IO_seekoff_unlocked (FILE *, off64_t, int, int)
 extern off64_t _IO_seekpos_unlocked (FILE *, off64_t, int)
      attribute_hidden;
 
-#ifndef EOF
-# define EOF (-1)
-#endif
-
 #if _G_HAVE_MMAP
 
 # include <unistd.h>

libio/oldiofdopen.c

@@ -102,9 +102,6 @@ _IO_old_fdopen (int fd, const char *mode)
   _IO_old_init (&new_f->fp.file._file, 0);
   _IO_JUMPS_FILE_plus (&new_f->fp) = &_IO_old_file_jumps;
   _IO_old_file_init_internal ((struct _IO_FILE_plus *) &new_f->fp);
-#if  !_IO_UNIFIED_JUMPTABLES
-  new_f->fp.vtable = NULL;
-#endif
   if (_IO_old_file_attach (&new_f->fp.file._file, fd) == NULL)
     {
       _IO_un_link ((struct _IO_FILE_plus *) &new_f->fp);

libio/oldiofopen.c

@@ -52,9 +52,6 @@ _IO_old_fopen (const char *filename, const char *mode)
   _IO_old_init (&new_f->fp.file._file, 0);
   _IO_JUMPS_FILE_plus (&new_f->fp) = &_IO_old_file_jumps;
   _IO_old_file_init_internal ((struct _IO_FILE_plus *) &new_f->fp);
-#if  !_IO_UNIFIED_JUMPTABLES
-  new_f->fp.vtable = NULL;
-#endif
   if (_IO_old_file_fopen ((FILE *) &new_f->fp, filename, mode) != NULL)
     return (FILE *) &new_f->fp;
   _IO_un_link ((struct _IO_FILE_plus *) &new_f->fp);

libio/oldiopopen.c

@@ -157,9 +157,6 @@ _IO_old_popen (const char *command, const char *mode)
   _IO_old_init (fp, 0);
   _IO_JUMPS_FILE_plus (&new_f->fpx.file) = &_IO_old_proc_jumps;
   _IO_old_file_init_internal ((struct _IO_FILE_plus *) &new_f->fpx.file);
-#if  !_IO_UNIFIED_JUMPTABLES
-  new_f->fpx.file.vtable = NULL;
-#endif
   if (_IO_old_proc_open (fp, command, mode) != NULL)
     return fp;
   _IO_un_link ((struct _IO_FILE_plus *) &new_f->fpx.file);