Demote ftime to a compat symbol; don’t install sys/timeb.h.

ftime is an obsolete variation on gettimeofday, offering only
millisecond time resolution; it was probably a system call in ooold
versions of BSD Unix.  It is the only function declared by
sys/timeb.h.  It was deprecated in POSIX.1-2001 and removed from
POSIX.1-2008.  In glibc 2.31, we marked its declaration with
__attribute_deprecated__.

Demote it to a compat symbol and stop installing sys/timeb.h.
Remove the minimal test of it (time/tst-ftime.c).

Rename time/tst-ftime_l.c to tst-strftime_l.c; this test program has
never had anything to do with ftime, it tests strftime_l.

6 files changed, 29 insertions, 114 deletions

diff --git a/conform/Makefile b/conform/Makefile
index 0b5c4cb8ce..2f986ab977 100644
--- a/conform/Makefile
+++ b/conform/Makefile
@@ -241,3 +241,12 @@ test-xfail-XPG42/ndbm.h/linknamespace = yes
 test-xfail-UNIX98/ndbm.h/linknamespace = yes
 test-xfail-XOPEN2K/ndbm.h/linknamespace = yes
 test-xfail-XOPEN2K8/ndbm.h/linknamespace = yes
+
+# Header no longer provided by glibc (obsoleted in newer POSIX
+# standards).
+test-xfail-UNIX98/sys/timeb.h/conform = yes
+test-xfail-UNIX98/sys/timeb.h/linknamespace = yes
+test-xfail-XOPEN2K/sys/timeb.h/conform = yes
+test-xfail-XOPEN2K/sys/timeb.h/linknamespace = yes
+test-xfail-XPG42/sys/timeb.h/conform = yes
+test-xfail-XPG42/sys/timeb.h/linknamespace = yes
diff --git a/time/Makefile b/time/Makefile
index a4fb13d6a3..c72abed005 100644
--- a/time/Makefile
+++ b/time/Makefile
@@ -22,7 +22,7 @@ subdir	:= time
 
 include ../Makeconfig
 
-headers := time.h sys/time.h sys/timeb.h bits/time.h			\
+headers := time.h sys/time.h bits/time.h				\
 	   bits/types/clockid_t.h bits/types/clock_t.h			\
 	   bits/types/struct_itimerspec.h				\
 	   bits/types/struct_timespec.h bits/types/struct_timeval.h	\
@@ -43,9 +43,9 @@ routines := offtime asctime clock ctime ctime_r difftime \
 aux :=	    era alt_digit lc-time-cleanup
 
 tests	:= test_time clocktest tst-posixtz tst-strptime tst_wcsftime \
-	   tst-getdate tst-mktime tst-mktime2 tst-ftime_l tst-strftime \
+	   tst-getdate tst-mktime tst-mktime2 tst-strftime tst-strftime_l \
 	   tst-mktime3 tst-strptime2 bug-asctime bug-asctime_r bug-mktime1 \
-	   tst-strptime3 bug-getdate1 tst-strptime-whitespace tst-ftime \
+	   tst-strptime3 bug-getdate1 tst-strptime-whitespace \
 	   tst-tzname tst-y2039 bug-mktime4 tst-strftime2 tst-strftime3 \
 	   tst-clock tst-clock2 tst-clock_nanosleep tst-cpuclock1
 
@@ -59,7 +59,7 @@ LOCALES := de_DE.ISO-8859-1 en_US.ISO-8859-1 ja_JP.EUC-JP fr_FR.UTF-8 \
 	   nan_TW.UTF-8 lzh_TW.UTF-8
 include ../gen-locales.mk
 
-$(objpfx)tst-ftime_l.out: $(gen-locales)
+$(objpfx)tst-strftime_l.out: $(gen-locales)
 $(objpfx)tst-strptime.out: $(gen-locales)
 $(objpfx)tst-strftime2.out: $(gen-locales)
 $(objpfx)tst-strftime3.out: $(gen-locales)
diff --git a/time/ftime.c b/time/ftime.c
index 93f485bbf7..0bbd923d70 100644
--- a/time/ftime.c
+++ b/time/ftime.c
@@ -16,10 +16,22 @@
    License along with the GNU C Library; if not, see
    <https://www.gnu.org/licenses/>.  */
 
-#include <sys/timeb.h>
+#include <shlib-compat.h>
+
+#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_32)
+
 #include <time.h>
 
+struct timeb
+{
+  time_t time;                  /* Seconds since epoch, as from `time'.  */
+  unsigned short int millitm;   /* Additional milliseconds.  */
+  short int timezone;           /* Minutes west of GMT.  */
+  short int dstflag;            /* Nonzero if Daylight Savings Time used.  */
+};
+
 int
+attribute_compat_text_section
 ftime (struct timeb *timebuf)
 {
   struct timespec ts;
@@ -31,3 +43,6 @@ ftime (struct timeb *timebuf)
   timebuf->dstflag = 0;
   return 0;
 }
+compat_symbol (libc, __ftime, ftime, GLIBC_2_0);
+
+#endif
diff --git a/time/sys/timeb.h b/time/sys/timeb.h
deleted file mode 100644
index 641c333450..0000000000
--- a/time/sys/timeb.h
+++ /dev/null
@@ -1,44 +0,0 @@
-/* Copyright (C) 1994-2020 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
-   <https://www.gnu.org/licenses/>.  */
-
-#ifndef _SYS_TIMEB_H
-#define _SYS_TIMEB_H	1
-
-#include <features.h>
-
-#include <bits/types/time_t.h>
-
-__BEGIN_DECLS
-
-/* Structure returned by the `ftime' function.  */
-
-struct timeb
-  {
-    time_t time;		/* Seconds since epoch, as from `time'.  */
-    unsigned short int millitm;	/* Additional milliseconds.  */
-    short int timezone;		/* Minutes west of GMT.  */
-    short int dstflag;		/* Nonzero if Daylight Savings Time used.  */
-  };
-
-/* Fill in TIMEBUF with information about the current time.  */
-
-extern int ftime (struct timeb *__timebuf)
-  __nonnull ((1)) __attribute_deprecated__;
-
-__END_DECLS
-
-#endif	/* sys/timeb.h */
diff --git a/time/tst-ftime.c b/time/tst-ftime.c
deleted file mode 100644
index 08916c0c65..0000000000
--- a/time/tst-ftime.c
+++ /dev/null
@@ -1,65 +0,0 @@
-/* Verify that ftime is sane.
-   Copyright (C) 2014-2020 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
-   <https://www.gnu.org/licenses/>.  */
-
-#include <sys/timeb.h>
-#include <stdio.h>
-#include <libc-diag.h>
-
-static int
-do_test (void)
-{
-  struct timeb prev, curr = {.time = 0, .millitm = 0};
-  int sec = 0;
-
-  while (sec != 3)
-    {
-      prev = curr;
-
-      /* ftime was deprecated on 2.31.  */
-      DIAG_PUSH_NEEDS_COMMENT;
-      DIAG_IGNORE_NEEDS_COMMENT (4.9, "-Wdeprecated-declarations");
-
-      if (ftime (&curr))
-        {
-          printf ("ftime returned an error\n");
-          return 1;
-        }
-
-      DIAG_POP_NEEDS_COMMENT;
-
-      if (curr.time < prev.time)
-        {
-          printf ("ftime's time flowed backwards\n");
-          return 1;
-        }
-
-      if (curr.time == prev.time
-          && curr.millitm < prev.millitm)
-        {
-          printf ("ftime's millitm flowed backwards\n");
-          return 1;
-        }
-
-      if (curr.time > prev.time)
-        sec ++;
-    }
-  return 0;
-}
-
-#define TEST_FUNCTION do_test ()
-#include "../test-skeleton.c"
diff --git a/time/tst-ftime_l.c b/time/tst-strftime_l.c
index 6690efeb9c..6690efeb9c 100644
--- a/time/tst-ftime_l.c
+++ b/time/tst-strftime_l.c