Merge commit 'refs/top-bases/t/ONSTACK' into t/ONSTACK

55 files changed, 470 insertions, 442 deletions

diff --git a/time/Makefile b/time/Makefile
index e052c0765d..ec3e39dcea 100644
--- a/time/Makefile
+++ b/time/Makefile
@@ -1,4 +1,4 @@
-# Copyright (C) 1991-2016 Free Software Foundation, Inc.
+# Copyright (C) 1991-2018 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
@@ -22,7 +22,12 @@ subdir	:= time
 
 include ../Makeconfig
 
-headers	:= time.h sys/time.h sys/timeb.h bits/time.h
+headers := time.h sys/time.h sys/timeb.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	\
+	   bits/types/struct_tm.h bits/types/timer_t.h			\
+	   bits/types/time_t.h
 
 routines := offtime asctime clock ctime ctime_r difftime \
 	    gmtime localtime mktime time		 \
@@ -38,12 +43,13 @@ tests	:= test_time clocktest tst-posixtz tst-strptime tst_wcsftime \
 	   tst-getdate tst-mktime tst-mktime2 tst-ftime_l tst-strftime \
 	   tst-mktime3 tst-strptime2 bug-asctime bug-asctime_r bug-mktime1 \
 	   tst-strptime3 bug-getdate1 tst-strptime-whitespace tst-ftime \
-	   tst-tzname
+	   tst-tzname tst-y2039
 
 include ../Rules
 
 ifeq ($(run-built-tests),yes)
-LOCALES := de_DE.ISO-8859-1 en_US.ISO-8859-1 ja_JP.EUC-JP
+LOCALES := de_DE.ISO-8859-1 en_US.ISO-8859-1 ja_JP.EUC-JP fr_FR.UTF-8 \
+	   es_ES.UTF-8 pl_PL.UTF-8 ru_RU.UTF-8
 include ../gen-locales.mk
 
 $(objpfx)tst-ftime_l.out: $(gen-locales)
@@ -54,17 +60,17 @@ tz-cflags = -DTZDIR='"$(zonedir)"' \
 	    -DTZDEFAULT='"$(localtime-file)"' \
 	    -DTZDEFRULES='"$(posixrules-file)"'
 
-CFLAGS-tzfile.c = $(tz-cflags)
-CFLAGS-tzset.c = $(tz-cflags)
-CFLAGS-getdate.c = -fexceptions
+CFLAGS-tzfile.c += $(tz-cflags)
+CFLAGS-tzset.c += $(tz-cflags)
+CFLAGS-getdate.c += -fexceptions
 
 # Don't warn about Y2k problem in strftime format string.
-CFLAGS-test_time.c = -Wno-format
+CFLAGS-test_time.c += -Wno-format
 
 tst-getdate-ENV= DATEMSK=datemsk TZDIR=${common-objpfx}timezone/testdata
 test_time-ARGS= EST5EDT CST
 
 tst-tzname-ENV = TZDIR=${common-objpfx}timezone/testdata
-CPPFLAGS-tst-tzname.c = -DTZDEFRULES='"$(posixrules-file)"'
+CPPFLAGS-tst-tzname.c += -DTZDEFRULES='"$(posixrules-file)"'
 
 bug-getdate1-ARGS = ${objpfx}bug-getdate1-fmt
diff --git a/time/adjtime.c b/time/adjtime.c
index 5114eadf85..4a972d66cd 100644
--- a/time/adjtime.c
+++ b/time/adjtime.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1991-2016 Free Software Foundation, Inc.
+/* Copyright (C) 1991-2018 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
diff --git a/time/alt_digit.c b/time/alt_digit.c
index 2167be304a..3b78384ddf 100644
--- a/time/alt_digit.c
+++ b/time/alt_digit.c
@@ -1,5 +1,5 @@
 /* Helper functions used by strftime/strptime to handle alternate digits.
-   Copyright (C) 1995-2016 Free Software Foundation, Inc.
+   Copyright (C) 1995-2018 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
@@ -69,7 +69,6 @@ _nl_init_alt_digit (struct __locale_data *current)
 }
 
 const char *
-internal_function
 _nl_get_alt_digit (unsigned int number, struct __locale_data *current)
 {
   const char *result;
@@ -95,7 +94,6 @@ _nl_get_alt_digit (unsigned int number, struct __locale_data *current)
 
 
 const wchar_t *
-internal_function
 _nl_get_walt_digit (unsigned int number, struct __locale_data *current)
 {
   const wchar_t *result = NULL;
@@ -148,7 +146,6 @@ _nl_get_walt_digit (unsigned int number, struct __locale_data *current)
 
 
 int
-internal_function
 _nl_parse_alt_digit (const char **strp, struct __locale_data *current)
 {
   const char *str = *strp;
diff --git a/time/asctime.c b/time/asctime.c
index 763f12e88e..ed9286f64e 100644
--- a/time/asctime.c
+++ b/time/asctime.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1991-2016 Free Software Foundation, Inc.
+/* Copyright (C) 1991-2018 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
diff --git a/time/bits/types/clock_t.h b/time/bits/types/clock_t.h
new file mode 100644
index 0000000000..ce97248f88
--- /dev/null
+++ b/time/bits/types/clock_t.h
@@ -0,0 +1,9 @@
+#ifndef __clock_t_defined
+#define __clock_t_defined 1
+
+#include <bits/types.h>
+
+/* Returned by `clock'.  */
+typedef __clock_t clock_t;
+
+#endif
diff --git a/time/bits/types/clockid_t.h b/time/bits/types/clockid_t.h
new file mode 100644
index 0000000000..b17c7da853
--- /dev/null
+++ b/time/bits/types/clockid_t.h
@@ -0,0 +1,9 @@
+#ifndef __clockid_t_defined
+#define __clockid_t_defined 1
+
+#include <bits/types.h>
+
+/* Clock ID used in clock and timer functions.  */
+typedef __clockid_t clockid_t;
+
+#endif
diff --git a/time/bits/types/struct_itimerspec.h b/time/bits/types/struct_itimerspec.h
new file mode 100644
index 0000000000..17cc1ac86d
--- /dev/null
+++ b/time/bits/types/struct_itimerspec.h
@@ -0,0 +1,14 @@
+#ifndef __itimerspec_defined
+#define __itimerspec_defined 1
+
+#include <bits/types.h>
+#include <bits/types/struct_timespec.h>
+
+/* POSIX.1b structure for timer start values and intervals.  */
+struct itimerspec
+  {
+    struct timespec it_interval;
+    struct timespec it_value;
+  };
+
+#endif
diff --git a/time/bits/types/struct_timespec.h b/time/bits/types/struct_timespec.h
new file mode 100644
index 0000000000..5b77c52b4f
--- /dev/null
+++ b/time/bits/types/struct_timespec.h
@@ -0,0 +1,15 @@
+/* NB: Include guard matches what <linux/time.h> uses.  */
+#ifndef _STRUCT_TIMESPEC
+#define _STRUCT_TIMESPEC 1
+
+#include <bits/types.h>
+
+/* POSIX.1b structure for a time value.  This is like a `struct timeval' but
+   has nanoseconds instead of microseconds.  */
+struct timespec
+{
+  __time_t tv_sec;		/* Seconds.  */
+  __syscall_slong_t tv_nsec;	/* Nanoseconds.  */
+};
+
+#endif
diff --git a/time/bits/types/struct_timeval.h b/time/bits/types/struct_timeval.h
new file mode 100644
index 0000000000..70394ce886
--- /dev/null
+++ b/time/bits/types/struct_timeval.h
@@ -0,0 +1,13 @@
+#ifndef __timeval_defined
+#define __timeval_defined 1
+
+#include <bits/types.h>
+
+/* A time value that is accurate to the nearest
+   microsecond but also has a range of years.  */
+struct timeval
+{
+  __time_t tv_sec;		/* Seconds.  */
+  __suseconds_t tv_usec;	/* Microseconds.  */
+};
+#endif
diff --git a/time/bits/types/struct_tm.h b/time/bits/types/struct_tm.h
new file mode 100644
index 0000000000..b13b631228
--- /dev/null
+++ b/time/bits/types/struct_tm.h
@@ -0,0 +1,28 @@
+#ifndef __struct_tm_defined
+#define __struct_tm_defined 1
+
+#include <bits/types.h>
+
+/* ISO C `broken-down time' structure.  */
+struct tm
+{
+  int tm_sec;			/* Seconds.	[0-60] (1 leap second) */
+  int tm_min;			/* Minutes.	[0-59] */
+  int tm_hour;			/* Hours.	[0-23] */
+  int tm_mday;			/* Day.		[1-31] */
+  int tm_mon;			/* Month.	[0-11] */
+  int tm_year;			/* Year	- 1900.  */
+  int tm_wday;			/* Day of week.	[0-6] */
+  int tm_yday;			/* Days in year.[0-365]	*/
+  int tm_isdst;			/* DST.		[-1/0/1]*/
+
+# ifdef	__USE_MISC
+  long int tm_gmtoff;		/* Seconds east of UTC.  */
+  const char *tm_zone;		/* Timezone abbreviation.  */
+# else
+  long int __tm_gmtoff;		/* Seconds east of UTC.  */
+  const char *__tm_zone;	/* Timezone abbreviation.  */
+# endif
+};
+
+#endif
diff --git a/time/bits/types/time_t.h b/time/bits/types/time_t.h
new file mode 100644
index 0000000000..ab8287c6fe
--- /dev/null
+++ b/time/bits/types/time_t.h
@@ -0,0 +1,9 @@
+#ifndef __time_t_defined
+#define __time_t_defined 1
+
+#include <bits/types.h>
+
+/* Returned by `time'.  */
+typedef __time_t time_t;
+
+#endif
diff --git a/time/bits/types/timer_t.h b/time/bits/types/timer_t.h
new file mode 100644
index 0000000000..d71a4130e2
--- /dev/null
+++ b/time/bits/types/timer_t.h
@@ -0,0 +1,9 @@
+#ifndef __timer_t_defined
+#define __timer_t_defined 1
+
+#include <bits/types.h>
+
+/* Timer ID returned by `timer_create'.  */
+typedef __timer_t timer_t;
+
+#endif
diff --git a/time/bug-getdate1.c b/time/bug-getdate1.c
index 3d68cf2a79..9afafba5be 100644
--- a/time/bug-getdate1.c
+++ b/time/bug-getdate1.c
@@ -3,6 +3,8 @@
 #include <stdio.h>
 #include <stdlib.h>
 
+#include <support/temp_file.h>
+
 static char *templ_filename;
 
 // Writes template given as parameter to file,
@@ -133,14 +135,18 @@ do_test (int argc, char *argv[])
 
   return res;
 }
+#define TEST_FUNCTION_ARGV do_test
 
-#define PREPARE(argc, argv) \
-  if (argc < 2)								\
-    {									\
-      puts ("Command line: progname template_filename_full_path");	\
-      exit (1);								\
-    }									\
-  add_temp_file (argv[1])
+static void
+do_prepare (int argc, char **argv)
+{
+  if (argc < 2)
+    {
+      puts ("Command line: progname template_filename_full_path");
+      exit (1);
+    }
+  add_temp_file (argv[1]);
+}
+#define PREPARE do_prepare
 
-#define TEST_FUNCTION do_test (argc, argv)
-#include "../test-skeleton.c"
+#include <support/test-driver.c>
diff --git a/time/clock.c b/time/clock.c
index 261abc6278..e5e896c5cb 100644
--- a/time/clock.c
+++ b/time/clock.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1991-2016 Free Software Foundation, Inc.
+/* Copyright (C) 1991-2018 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
diff --git a/time/clocktest.c b/time/clocktest.c
index 13b7420e2e..779c05d8d9 100644
--- a/time/clocktest.c
+++ b/time/clocktest.c
@@ -3,6 +3,7 @@
 #include <stdlib.h>
 #include <time.h>
 #include <unistd.h>
+#include <stdint.h>
 
 volatile int gotit = 0;
 
diff --git a/time/ctime.c b/time/ctime.c
index 451d7b9fa9..1222614f29 100644
--- a/time/ctime.c
+++ b/time/ctime.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1991-2016 Free Software Foundation, Inc.
+/* Copyright (C) 1991-2018 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
diff --git a/time/ctime_r.c b/time/ctime_r.c
index 0fcf9d8e8e..c111146d76 100644
--- a/time/ctime_r.c
+++ b/time/ctime_r.c
@@ -1,5 +1,5 @@
 /* Return in BUF representation of time T in form of asctime
-   Copyright (C) 1996-2016 Free Software Foundation, Inc.
+   Copyright (C) 1996-2018 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
 
diff --git a/time/difftime.c b/time/difftime.c
index 98850795e3..7c5dd9898b 100644
--- a/time/difftime.c
+++ b/time/difftime.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1991-2016 Free Software Foundation, Inc.
+/* Copyright (C) 1991-2018 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
diff --git a/time/dysize.c b/time/dysize.c
index 77f67a7ea3..6c511a70f2 100644
--- a/time/dysize.c
+++ b/time/dysize.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1994-2016 Free Software Foundation, Inc.
+/* Copyright (C) 1994-2018 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
diff --git a/time/era.c b/time/era.c
index 8c9927419a..4bae7077e1 100644
--- a/time/era.c
+++ b/time/era.c
@@ -1,5 +1,5 @@
 /* Helper functions used by strftime/strptime to handle locale-specific "eras".
-   Copyright (C) 1995-2016 Free Software Foundation, Inc.
+   Copyright (C) 1995-2018 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
@@ -35,7 +35,7 @@ __libc_rwlock_define (extern, __libc_setlocale_lock attribute_hidden)
 
 /* Look up the era information in CURRENT's locale strings and
    cache it in CURRENT->private.  */
-static void internal_function
+static void
 _nl_init_era_entries (struct __locale_data *current)
 {
   size_t cnt;
@@ -139,7 +139,6 @@ _nl_init_era_entries (struct __locale_data *current)
 }
 
 struct era_entry *
-internal_function
 _nl_get_era_entry (const struct tm *tp, struct __locale_data *current)
 {
   if (current->private.time == NULL || !current->private.time->era_initialized)
@@ -166,7 +165,6 @@ _nl_get_era_entry (const struct tm *tp, struct __locale_data *current)
 
 
 struct era_entry *
-internal_function
 _nl_select_era_entry (int cnt, struct __locale_data *current)
 {
   if (current->private.time == NULL || !current->private.time->era_initialized)
diff --git a/time/ftime.c b/time/ftime.c
index f816fbe667..622c6ce8e8 100644
--- a/time/ftime.c
+++ b/time/ftime.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1994-2016 Free Software Foundation, Inc.
+/* Copyright (C) 1994-2018 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
diff --git a/time/getdate.c b/time/getdate.c
index 52a0d9e78a..e568149cdf 100644
--- a/time/getdate.c
+++ b/time/getdate.c
@@ -1,5 +1,5 @@
 /* Convert a string representation of time to a time value.
-   Copyright (C) 1997-2016 Free Software Foundation, Inc.
+   Copyright (C) 1997-2018 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Mark Kettenis <kettenis@phys.uva.nl>, 1997.
 
@@ -198,7 +198,7 @@ __getdate_r (const char *string, struct tm *tp)
       if (result && *result == '\0')
 	break;
     }
-  while (!feof_unlocked (fp));
+  while (!__feof_unlocked (fp));
 
   free (instr);
 
@@ -206,7 +206,7 @@ __getdate_r (const char *string, struct tm *tp)
   free (line);
 
   /* Check for errors. */
-  if (ferror_unlocked (fp))
+  if (__ferror_unlocked (fp))
     {
       fclose (fp);
       return 5;
diff --git a/time/getitimer.c b/time/getitimer.c
index ac1d0d85ad..2ff832f84a 100644
--- a/time/getitimer.c
+++ b/time/getitimer.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1991-2016 Free Software Foundation, Inc.
+/* Copyright (C) 1991-2018 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
diff --git a/time/gettimeofday.c b/time/gettimeofday.c
index 87093c92e8..d1ab9acd17 100644
--- a/time/gettimeofday.c
+++ b/time/gettimeofday.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1991-2016 Free Software Foundation, Inc.
+/* Copyright (C) 1991-2018 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
diff --git a/time/gmtime.c b/time/gmtime.c
index b3b5d0d4d7..dc33b3e68a 100644
--- a/time/gmtime.c
+++ b/time/gmtime.c
@@ -1,5 +1,5 @@
 /* Convert `time_t' to `struct tm' in UTC.
-   Copyright (C) 1991-2016 Free Software Foundation, Inc.
+   Copyright (C) 1991-2018 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
diff --git a/time/lc-time-cleanup.c b/time/lc-time-cleanup.c
index c909175915..6fa1024120 100644
--- a/time/lc-time-cleanup.c
+++ b/time/lc-time-cleanup.c
@@ -1,5 +1,5 @@
 /* Cleanup code for data structures kept by strftime/strptime helper functions.
-   Copyright (C) 2002-2016 Free Software Foundation, Inc.
+   Copyright (C) 2002-2018 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
@@ -19,7 +19,7 @@
 #include "../locale/localeinfo.h"
 #include <stdlib.h>
 
-void internal_function
+void
 _nl_cleanup_time (struct __locale_data *locale)
 {
   struct lc_time_data *const data = locale->private.time;
diff --git a/time/localtime.c b/time/localtime.c
index 8ec40cf333..8684a8a971 100644
--- a/time/localtime.c
+++ b/time/localtime.c
@@ -1,5 +1,5 @@
 /* Convert `time_t' to `struct tm' in local time zone.
-   Copyright (C) 1991-2016 Free Software Foundation, Inc.
+   Copyright (C) 1991-2018 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
diff --git a/time/mktime.c b/time/mktime.c
index bc7ed5674b..5f038a212f 100644
--- a/time/mktime.c
+++ b/time/mktime.c
@@ -1,5 +1,5 @@
 /* Convert a 'struct tm' to a time_t value.
-   Copyright (C) 1993-2016 Free Software Foundation, Inc.
+   Copyright (C) 1993-2018 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Paul Eggert <eggert@twinsun.com>.
 
diff --git a/time/offtime.c b/time/offtime.c
index b540b2f372..04c48389fc 100644
--- a/time/offtime.c
+++ b/time/offtime.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1991-2016 Free Software Foundation, Inc.
+/* Copyright (C) 1991-2018 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
diff --git a/time/setitimer.c b/time/setitimer.c
index b99117ab44..468f86b6c2 100644
--- a/time/setitimer.c
+++ b/time/setitimer.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1991-2016 Free Software Foundation, Inc.
+/* Copyright (C) 1991-2018 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
diff --git a/time/settimeofday.c b/time/settimeofday.c
index f91caf02da..01bf4b032d 100644
--- a/time/settimeofday.c
+++ b/time/settimeofday.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1991-2016 Free Software Foundation, Inc.
+/* Copyright (C) 1991-2018 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
diff --git a/time/stime.c b/time/stime.c
index 0522335f00..0378e23888 100644
--- a/time/stime.c
+++ b/time/stime.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1992-2016 Free Software Foundation, Inc.
+/* Copyright (C) 1992-2018 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
diff --git a/time/strftime.c b/time/strftime.c
index 92150d9205..65dda8ede1 100644
--- a/time/strftime.c
+++ b/time/strftime.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1991-2016 Free Software Foundation, Inc.
+/* Copyright (C) 1991-2018 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
diff --git a/time/strftime_l.c b/time/strftime_l.c
index 1205035206..c71f9f47a9 100644
--- a/time/strftime_l.c
+++ b/time/strftime_l.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 2002-2016 Free Software Foundation, Inc.
+/* Copyright (C) 2002-2018 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
@@ -106,6 +106,7 @@ extern char *tzname[];
 # define UCHAR_T unsigned char
 # define L_(Str) Str
 # define NLW(Sym) Sym
+# define ABALTMON_1 _NL_ABALTMON_1
 
 # if !defined STDC_HEADERS && !defined HAVE_MEMCPY
 #  define MEMCPY(d, s, n) bcopy ((s), (d), (n))
@@ -284,7 +285,7 @@ static const CHAR_T zeroes[16] = /* "0000000000000000" */
 # undef _NL_CURRENT
 # define _NL_CURRENT(category, item) \
   (current->values[_NL_ITEM_INDEX (item)].string)
-# define LOCALE_PARAM , __locale_t loc
+# define LOCALE_PARAM , locale_t loc
 # define LOCALE_ARG , loc
 # define HELPER_LOCALE_ARG  , current
 #else
@@ -492,12 +493,19 @@ __strftime_internal (CHAR_T *s, size_t maxsize, const CHAR_T *format,
 # define f_month \
   ((const CHAR_T *) (tp->tm_mon < 0 || tp->tm_mon > 11			     \
 		     ? "?" : _NL_CURRENT (LC_TIME, NLW(MON_1) + tp->tm_mon)))
+# define a_altmonth \
+  ((const CHAR_T *) (tp->tm_mon < 0 || tp->tm_mon > 11			     \
+		     ? "?" : _NL_CURRENT (LC_TIME, NLW(ABALTMON_1) + tp->tm_mon)))
+# define f_altmonth \
+  ((const CHAR_T *) (tp->tm_mon < 0 || tp->tm_mon > 11			     \
+		     ? "?" : _NL_CURRENT (LC_TIME, NLW(ALTMON_1) + tp->tm_mon)))
 # define ampm \
   ((const CHAR_T *) _NL_CURRENT (LC_TIME, tp->tm_hour > 11		      \
 				 ? NLW(PM_STR) : NLW(AM_STR)))
 
 # define aw_len STRLEN (a_wkday)
 # define am_len STRLEN (a_month)
+# define aam_len STRLEN (a_altmonth)
 # define ap_len STRLEN (ampm)
 #else
 # if !HAVE_STRFTIME
@@ -507,10 +515,13 @@ __strftime_internal (CHAR_T *s, size_t maxsize, const CHAR_T *format,
 		   ? "?" : month_name[tp->tm_mon])
 #  define a_wkday f_wkday
 #  define a_month f_month
+#  define a_altmonth a_month
+#  define f_altmonth f_month
 #  define ampm (L_("AMPM") + 2 * (tp->tm_hour > 11))
 
   size_t aw_len = 3;
   size_t am_len = 3;
+  size_t aam_len = 3;
   size_t ap_len = 2;
 # endif
 #endif
@@ -715,12 +726,22 @@ __strftime_internal (CHAR_T *s, size_t maxsize, const CHAR_T *format,
       format_char = *f;
       switch (format_char)
 	{
-#define DO_NUMBER(d, v) \
-	  digits = d > width ? d : width;				      \
-	  number_value = v; goto do_number
-#define DO_NUMBER_SPACEPAD(d, v) \
-	  digits = d > width ? d : width;				      \
-	  number_value = v; goto do_number_spacepad
+#define DO_NUMBER(d, v)				\
+	  do					\
+	    {					\
+	      digits = d > width ? d : width;	\
+	      number_value = v;			\
+	      goto do_number;			\
+	    }					\
+	  while (0)
+#define DO_NUMBER_SPACEPAD(d, v)		\
+	  do					\
+	    {					\
+	      digits = d > width ? d : width;	\
+	      number_value = v;			\
+	      goto do_number_spacepad;		\
+	    }					\
+	  while (0)
 
 	case L_('%'):
 	  if (modifier != 0)
@@ -765,17 +786,20 @@ __strftime_internal (CHAR_T *s, size_t maxsize, const CHAR_T *format,
 	      to_uppcase = 1;
 	      to_lowcase = 0;
 	    }
-	  if (modifier != 0)
+	  if (modifier == L_('E'))
 	    goto bad_format;
 #if defined _NL_CURRENT || !HAVE_STRFTIME
-	  cpy (am_len, a_month);
+	  if (modifier == L_('O'))
+	    cpy (aam_len, a_altmonth);
+	  else
+	    cpy (am_len, a_month);
 	  break;
 #else
 	  goto underlying_strftime;
 #endif
 
 	case L_('B'):
-	  if (modifier != 0)
+	  if (modifier == L_('E'))
 	    goto bad_format;
 	  if (change_case)
 	    {
@@ -783,7 +807,10 @@ __strftime_internal (CHAR_T *s, size_t maxsize, const CHAR_T *format,
 	      to_lowcase = 0;
 	    }
 #if defined _NL_CURRENT || !HAVE_STRFTIME
-	  cpy (STRLEN (f_month), f_month);
+	  if (modifier == L_('O'))
+	    cpy (STRLEN (f_altmonth), f_altmonth);
+	  else
+	    cpy (STRLEN (f_month), f_month);
 	  break;
 #else
 	  goto underlying_strftime;
diff --git a/time/strptime.c b/time/strptime.c
index 7e0726fe62..bbc5239aa1 100644
--- a/time/strptime.c
+++ b/time/strptime.c
@@ -1,5 +1,5 @@
 /* Convert a string representation of time to a time value.
-   Copyright (C) 1996-2016 Free Software Foundation, Inc.
+   Copyright (C) 1996-2018 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
 
diff --git a/time/strptime_l.c b/time/strptime_l.c
index 3a56947127..cd901c2606 100644
--- a/time/strptime_l.c
+++ b/time/strptime_l.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 2002-2016 Free Software Foundation, Inc.
+/* Copyright (C) 2002-2018 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
@@ -124,6 +124,10 @@ extern const struct __locale_data _nl_C_LC_TIME attribute_hidden;
   (&_nl_C_LC_TIME.values[_NL_ITEM_INDEX (ABDAY_1)].string)
 # define month_name (&_nl_C_LC_TIME.values[_NL_ITEM_INDEX (MON_1)].string)
 # define ab_month_name (&_nl_C_LC_TIME.values[_NL_ITEM_INDEX (ABMON_1)].string)
+# define alt_month_name \
+  (&_nl_C_LC_TIME.values[_NL_ITEM_INDEX (ALTMON_1)].string)
+# define ab_alt_month_name \
+  (&_nl_C_LC_TIME.values[_NL_ITEM_INDEX (_NL_ABALTMON_1)].string)
 # define HERE_D_T_FMT (_nl_C_LC_TIME.values[_NL_ITEM_INDEX (D_T_FMT)].string)
 # define HERE_D_FMT (_nl_C_LC_TIME.values[_NL_ITEM_INDEX (D_FMT)].string)
 # define HERE_AM_STR (_nl_C_LC_TIME.values[_NL_ITEM_INDEX (AM_STR)].string)
@@ -181,7 +185,7 @@ static const unsigned short int __mon_yday[2][13] =
 # undef _NL_CURRENT_WORD
 # define _NL_CURRENT_WORD(category, item) \
   (current->values[_NL_ITEM_INDEX (item)].word)
-# define LOCALE_PARAM , __locale_t locale
+# define LOCALE_PARAM , locale_t locale
 # define LOCALE_ARG , locale
 # define HELPER_LOCALE_ARG , current
 # define ISSPACE(Ch) __isspace_l (Ch, locale)
@@ -231,7 +235,6 @@ day_of_the_year (struct tm *tm)
 
 #ifdef _LIBC
 char *
-internal_function
 #else
 static char *
 #endif
@@ -320,10 +323,9 @@ __strptime_internal (const char *rp, const char *fmt, struct tm *tmp,
       while (*fmt >= '0' && *fmt <= '9')
 	++fmt;
 
-#ifndef _NL_CURRENT
-      /* We need this for handling the `E' modifier.  */
+      /* In some cases, modifiers are handled by adjusting state and
+         then restarting the switch statement below.  */
     start_over:
-#endif
 
       /* Make back up of current processing pointer.  */
       rp_backup = rp;
@@ -424,13 +426,46 @@ __strptime_internal (const char *rp, const char *fmt, struct tm *tmp,
 				     ab_month_name[cnt]))
 			decided_longest = loc;
 		    }
+#ifdef _LIBC
+		  /* Now check the alt month.  */
+		  trp = rp;
+		  if (match_string (_NL_CURRENT (LC_TIME, ALTMON_1 + cnt), trp)
+		      && trp > rp_longest)
+		    {
+		      rp_longest = trp;
+		      cnt_longest = cnt;
+		      if (s.decided == not
+			  && strcmp (_NL_CURRENT (LC_TIME, ALTMON_1 + cnt),
+				     alt_month_name[cnt]))
+			decided_longest = loc;
+		    }
+		  trp = rp;
+		  if (match_string (_NL_CURRENT (LC_TIME, _NL_ABALTMON_1 + cnt),
+				    trp)
+		      && trp > rp_longest)
+		    {
+		      rp_longest = trp;
+		      cnt_longest = cnt;
+		      if (s.decided == not
+			  && strcmp (_NL_CURRENT (LC_TIME, _NL_ABALTMON_1 + cnt),
+				     alt_month_name[cnt]))
+			decided_longest = loc;
+		    }
+#endif
 		}
 #endif
 	      if (s.decided != loc
 		  && (((trp = rp, match_string (month_name[cnt], trp))
 		       && trp > rp_longest)
 		      || ((trp = rp, match_string (ab_month_name[cnt], trp))
-			  && trp > rp_longest)))
+			  && trp > rp_longest)
+#ifdef _LIBC
+		      || ((trp = rp, match_string (alt_month_name[cnt], trp))
+			  && trp > rp_longest)
+		      || ((trp = rp, match_string (ab_alt_month_name[cnt], trp))
+			  && trp > rp_longest)
+#endif
+	      ))
 		{
 		  rp_longest = trp;
 		  cnt_longest = cnt;
@@ -1016,6 +1051,12 @@ __strptime_internal (const char *rp, const char *fmt, struct tm *tmp,
 	case 'O':
 	  switch (*fmt++)
 	    {
+	    case 'b':
+	    case 'B':
+	    case 'h':
+	      /* Match month name.  Reprocess as plain 'B'.  */
+	      fmt--;
+	      goto start_over;
 	    case 'd':
 	    case 'e':
 	      /* Match day of month using alternate numeric symbols.  */
diff --git a/time/sys/time.h b/time/sys/time.h
index 545de6f3d8..4166a5b10f 100644
--- a/time/sys/time.h
+++ b/time/sys/time.h
@@ -1,4 +1,4 @@
-/* Copyright (C) 1991-2016 Free Software Foundation, Inc.
+/* Copyright (C) 1991-2018 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
@@ -21,18 +21,15 @@
 #include <features.h>
 
 #include <bits/types.h>
-#define __need_time_t
-#include <time.h>
-#define __need_timeval
-#include <bits/time.h>
-
-#include <sys/select.h>
+#include <bits/types/time_t.h>
+#include <bits/types/struct_timeval.h>
 
 #ifndef __suseconds_t_defined
 typedef __suseconds_t suseconds_t;
 # define __suseconds_t_defined
 #endif
 
+#include <sys/select.h>
 
 __BEGIN_DECLS
 
diff --git a/time/sys/timeb.h b/time/sys/timeb.h
index 41d71bf9e9..e9b4a37f1b 100644
--- a/time/sys/timeb.h
+++ b/time/sys/timeb.h
@@ -1,4 +1,4 @@
-/* Copyright (C) 1994-2016 Free Software Foundation, Inc.
+/* Copyright (C) 1994-2018 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
@@ -20,9 +20,7 @@
 
 #include <features.h>
 
-#define __need_time_t
-#include <time.h>
-
+#include <bits/types/time_t.h>
 
 __BEGIN_DECLS
 
diff --git a/time/test_time.c b/time/test_time.c
index b0abd68480..4bed27996d 100644
--- a/time/test_time.c
+++ b/time/test_time.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1991-2016 Free Software Foundation, Inc.
+/* Copyright (C) 1991-2018 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
diff --git a/time/time.c b/time/time.c
index ec49e990fe..4996d26f13 100644
--- a/time/time.c
+++ b/time/time.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1991-2016 Free Software Foundation, Inc.
+/* Copyright (C) 1991-2018 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
diff --git a/time/time.h b/time/time.h
index cc93917b82..4b55e34402 100644
--- a/time/time.h
+++ b/time/time.h
@@ -1,4 +1,4 @@
-/* Copyright (C) 1991-2016 Free Software Foundation, Inc.
+/* Copyright (C) 1991-2018 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
@@ -20,172 +20,55 @@
  */
 
 #ifndef	_TIME_H
+#define _TIME_H	1
 
-#if (! defined __need_time_t && !defined __need_clock_t && \
-     ! defined __need_timespec)
-# define _TIME_H	1
-# include <features.h>
+#include <features.h>
 
-__BEGIN_DECLS
-
-#endif
-
-#ifdef	_TIME_H
-/* Get size_t and NULL from <stddef.h>.  */
-# define __need_size_t
-# define __need_NULL
-# include <stddef.h>
+#define __need_size_t
+#define __need_NULL
+#include <stddef.h>
 
 /* This defines CLOCKS_PER_SEC, which is the number of processor clock
-   ticks per second.  */
-# include <bits/time.h>
-
-/* This is the obsolete POSIX.1-1988 name for the same constant.  */
-# if !defined __STRICT_ANSI__ && !defined __USE_XOPEN2K
-#  ifndef CLK_TCK
-#   define CLK_TCK	CLOCKS_PER_SEC
-#  endif
-# endif
-
-#endif /* <time.h> included.  */
-
-#if !defined __clock_t_defined && (defined _TIME_H || defined __need_clock_t)
-# define __clock_t_defined	1
-
-# include <bits/types.h>
-
-__BEGIN_NAMESPACE_STD
-/* Returned by `clock'.  */
-typedef __clock_t clock_t;
-__END_NAMESPACE_STD
-#if defined __USE_XOPEN || defined __USE_POSIX
-__USING_NAMESPACE_STD(clock_t)
-#endif
-
-#endif /* clock_t not defined and <time.h> or need clock_t.  */
-#undef	__need_clock_t
-
-#if !defined __time_t_defined && (defined _TIME_H || defined __need_time_t)
-# define __time_t_defined	1
+   ticks per second, and possibly a number of other constants.   */
+#include <bits/time.h>
 
-# include <bits/types.h>
+/* Many of the typedefs and structs whose official home is this header
+   may also need to be defined by other headers.  */
+#include <bits/types/clock_t.h>
+#include <bits/types/time_t.h>
+#include <bits/types/struct_tm.h>
 
-__BEGIN_NAMESPACE_STD
-/* Returned by `time'.  */
-typedef __time_t time_t;
-__END_NAMESPACE_STD
-#ifdef __USE_POSIX
-__USING_NAMESPACE_STD(time_t)
+#if defined __USE_POSIX199309 || defined __USE_ISOC11
+# include <bits/types/struct_timespec.h>
 #endif
 
-#endif /* time_t not defined and <time.h> or need time_t.  */
-#undef	__need_time_t
-
-#if !defined __clockid_t_defined && \
-   ((defined _TIME_H && defined __USE_POSIX199309) || defined __need_clockid_t)
-# define __clockid_t_defined	1
-
-# include <bits/types.h>
-
-/* Clock ID used in clock and timer functions.  */
-typedef __clockid_t clockid_t;
-
-#endif /* clockid_t not defined and <time.h> or need clockid_t.  */
-#undef	__clockid_time_t
-
-#if !defined __timer_t_defined && \
-    ((defined _TIME_H && defined __USE_POSIX199309) || defined __need_timer_t)
-# define __timer_t_defined	1
-
-# include <bits/types.h>
-
-/* Timer ID returned by `timer_create'.  */
-typedef __timer_t timer_t;
-
-#endif /* timer_t not defined and <time.h> or need timer_t.  */
-#undef	__need_timer_t
-
-
-#if (!defined __timespec_defined					\
-     && ((defined _TIME_H						\
-	  && (defined __USE_POSIX199309					\
-	      || defined __USE_ISOC11))					\
-	 || defined __need_timespec))
-# define __timespec_defined	1
-
-# include <bits/types.h>	/* This defines __time_t for us.  */
-
-/* POSIX.1b structure for a time value.  This is like a `struct timeval' but
-   has nanoseconds instead of microseconds.  */
-struct timespec
-  {
-    __time_t tv_sec;		/* Seconds.  */
-    __syscall_slong_t tv_nsec;	/* Nanoseconds.  */
-  };
-
-#endif /* timespec not defined and <time.h> or need timespec.  */
-#undef	__need_timespec
-
-
-#ifdef	_TIME_H
-__BEGIN_NAMESPACE_STD
-/* Used by other time functions.  */
-struct tm
-{
-  int tm_sec;			/* Seconds.	[0-60] (1 leap second) */
-  int tm_min;			/* Minutes.	[0-59] */
-  int tm_hour;			/* Hours.	[0-23] */
-  int tm_mday;			/* Day.		[1-31] */
-  int tm_mon;			/* Month.	[0-11] */
-  int tm_year;			/* Year	- 1900.  */
-  int tm_wday;			/* Day of week.	[0-6] */
-  int tm_yday;			/* Days in year.[0-365]	*/
-  int tm_isdst;			/* DST.		[-1/0/1]*/
-
-# ifdef	__USE_MISC
-  long int tm_gmtoff;		/* Seconds east of UTC.  */
-  const char *tm_zone;		/* Timezone abbreviation.  */
-# else
-  long int __tm_gmtoff;		/* Seconds east of UTC.  */
-  const char *__tm_zone;	/* Timezone abbreviation.  */
-# endif
-};
-__END_NAMESPACE_STD
-#if defined __USE_XOPEN || defined __USE_POSIX
-__USING_NAMESPACE_STD(tm)
-#endif
-
-
-# ifdef __USE_POSIX199309
-/* POSIX.1b structure for timer start values and intervals.  */
-struct itimerspec
-  {
-    struct timespec it_interval;
-    struct timespec it_value;
-  };
-
-/* We can use a simple forward declaration.  */
+#ifdef __USE_POSIX199309
+# include <bits/types/clockid_t.h>
+# include <bits/types/timer_t.h>
+# include <bits/types/struct_itimerspec.h>
 struct sigevent;
+#endif
 
-# endif	/* POSIX.1b */
-
-# ifdef __USE_XOPEN2K
-#  ifndef __pid_t_defined
+#ifdef __USE_XOPEN2K
+# ifndef __pid_t_defined
 typedef __pid_t pid_t;
-#   define __pid_t_defined
-#  endif
+#  define __pid_t_defined
 # endif
+#endif
 
+#ifdef __USE_XOPEN2K8
+# include <bits/types/locale_t.h>
+#endif
 
-# ifdef __USE_ISOC11
+#ifdef __USE_ISOC11
 /* Time base values for timespec_get.  */
 # define TIME_UTC 1
-# endif
+#endif
 
+__BEGIN_DECLS
 
-__BEGIN_NAMESPACE_STD
 /* Time used by the program so far (user time + system time).
-   The result / CLOCKS_PER_SECOND is program time in seconds.  */
+   The result / CLOCKS_PER_SEC is program time in seconds.  */
 extern clock_t clock (void) __THROW;
 
 /* Return the current time and put it in *TIMER if TIMER is not NULL.  */
@@ -205,35 +88,32 @@ extern time_t mktime (struct tm *__tp) __THROW;
 extern size_t strftime (char *__restrict __s, size_t __maxsize,
 			const char *__restrict __format,
 			const struct tm *__restrict __tp) __THROW;
-__END_NAMESPACE_STD
 
-# ifdef __USE_XOPEN
+#ifdef __USE_XOPEN
 /* Parse S according to FORMAT and store binary time information in TP.
    The return value is a pointer to the first unparsed character in S.  */
 extern char *strptime (const char *__restrict __s,
 		       const char *__restrict __fmt, struct tm *__tp)
      __THROW;
-# endif
+#endif
 
-# ifdef __USE_XOPEN2K8
+#ifdef __USE_XOPEN2K8
 /* Similar to the two functions above but take the information from
    the provided locale and not the global locale.  */
-# include <xlocale.h>
 
 extern size_t strftime_l (char *__restrict __s, size_t __maxsize,
 			  const char *__restrict __format,
 			  const struct tm *__restrict __tp,
-			  __locale_t __loc) __THROW;
-# endif
+			  locale_t __loc) __THROW;
+#endif
 
-# ifdef __USE_GNU
+#ifdef __USE_GNU
 extern char *strptime_l (const char *__restrict __s,
 			 const char *__restrict __fmt, struct tm *__tp,
-			 __locale_t __loc) __THROW;
-# endif
+			 locale_t __loc) __THROW;
+#endif
 
 
-__BEGIN_NAMESPACE_STD
 /* Return the `struct tm' representation of *TIMER
    in Universal Coordinated Time (aka Greenwich Mean Time).  */
 extern struct tm *gmtime (const time_t *__timer) __THROW;
@@ -241,9 +121,8 @@ extern struct tm *gmtime (const time_t *__timer) __THROW;
 /* Return the `struct tm' representation
    of *TIMER in the local timezone.  */
 extern struct tm *localtime (const time_t *__timer) __THROW;
-__END_NAMESPACE_STD
 
-# ifdef __USE_POSIX
+#ifdef __USE_POSIX
 /* Return the `struct tm' representation of *TIMER in UTC,
    using *TP to store the result.  */
 extern struct tm *gmtime_r (const time_t *__restrict __timer,
@@ -253,18 +132,16 @@ extern struct tm *gmtime_r (const time_t *__restrict __timer,
    using *TP to store the result.  */
 extern struct tm *localtime_r (const time_t *__restrict __timer,
 			       struct tm *__restrict __tp) __THROW;
-# endif	/* POSIX */
+#endif	/* POSIX */
 
-__BEGIN_NAMESPACE_STD
 /* Return a string of the form "Day Mon dd hh:mm:ss yyyy\n"
    that is the representation of TP in this format.  */
 extern char *asctime (const struct tm *__tp) __THROW;
 
 /* Equivalent to `asctime (localtime (timer))'.  */
 extern char *ctime (const time_t *__timer) __THROW;
-__END_NAMESPACE_STD
 
-# ifdef __USE_POSIX
+#ifdef __USE_POSIX
 /* Reentrant versions of the above functions.  */
 
 /* Return in BUF a string of the form "Day Mon dd hh:mm:ss yyyy\n"
@@ -275,7 +152,7 @@ extern char *asctime_r (const struct tm *__restrict __tp,
 /* Equivalent to `asctime_r (localtime_r (timer, *TMP*), buf)'.  */
 extern char *ctime_r (const time_t *__restrict __timer,
 		      char *__restrict __buf) __THROW;
-# endif	/* POSIX */
+#endif	/* POSIX */
 
 
 /* Defined in localtime.c.  */
@@ -284,34 +161,34 @@ extern int __daylight;		/* If daylight-saving time is ever in use.  */
 extern long int __timezone;	/* Seconds west of UTC.  */
 
 
-# ifdef	__USE_POSIX
+#ifdef	__USE_POSIX
 /* Same as above.  */
 extern char *tzname[2];
 
 /* Set time conversion information from the TZ environment variable.
    If TZ is not defined, a locale-dependent default is used.  */
 extern void tzset (void) __THROW;
-# endif
+#endif
 
-# if defined __USE_MISC || defined __USE_XOPEN
+#if defined __USE_MISC || defined __USE_XOPEN
 extern int daylight;
 extern long int timezone;
-# endif
+#endif
 
-# ifdef __USE_MISC
+#ifdef __USE_MISC
 /* Set the system time to *WHEN.
    This call is restricted to the superuser.  */
 extern int stime (const time_t *__when) __THROW;
-# endif
+#endif
 
 
 /* Nonzero if YEAR is a leap year (every 4 years,
    except every 100th isn't, and every 400th is).  */
-# define __isleap(year)	\
+#define __isleap(year)	\
   ((year) % 4 == 0 && ((year) % 100 != 0 || (year) % 400 == 0))
 
 
-# ifdef __USE_MISC
+#ifdef __USE_MISC
 /* Miscellaneous functions many Unices inherited from the public domain
    localtime package.  These are included only for compatibility.  */
 
@@ -323,10 +200,10 @@ extern time_t timelocal (struct tm *__tp) __THROW;
 
 /* Return the number of days in YEAR.  */
 extern int dysize (int __year) __THROW  __attribute__ ((__const__));
-# endif
+#endif
 
 
-# ifdef __USE_POSIX199309
+#ifdef __USE_POSIX199309
 /* Pause execution for a number of nanoseconds.
 
    This function is a cancellation point and therefore not marked with
@@ -345,7 +222,7 @@ extern int clock_gettime (clockid_t __clock_id, struct timespec *__tp) __THROW;
 extern int clock_settime (clockid_t __clock_id, const struct timespec *__tp)
      __THROW;
 
-#  ifdef __USE_XOPEN2K
+# ifdef __USE_XOPEN2K
 /* High-resolution sleep with the specified clock.
 
    This function is a cancellation point and therefore not marked with
@@ -356,7 +233,7 @@ extern int clock_nanosleep (clockid_t __clock_id, int __flags,
 
 /* Return clock ID for CPU-time clock.  */
 extern int clock_getcpuclockid (pid_t __pid, clockid_t *__clock_id) __THROW;
-#  endif
+# endif
 
 
 /* Create new per-process timer using CLOCK_ID.  */
@@ -378,17 +255,17 @@ extern int timer_gettime (timer_t __timerid, struct itimerspec *__value)
 
 /* Get expiration overrun for timer TIMERID.  */
 extern int timer_getoverrun (timer_t __timerid) __THROW;
-# endif
+#endif
 
 
-# ifdef __USE_ISOC11
+#ifdef __USE_ISOC11
 /* Set TS to calendar time based in time base BASE.  */
 extern int timespec_get (struct timespec *__ts, int __base)
      __THROW __nonnull ((1));
-# endif
+#endif
 
 
-# ifdef __USE_XOPEN_EXTENDED
+#ifdef __USE_XOPEN_EXTENDED
 /* Set to one of the following values to indicate an error.
      1  the DATEMSK environment variable is null or undefined,
      2  the template file cannot be opened for reading,
@@ -410,9 +287,9 @@ extern int getdate_err;
    This function is a possible cancellation point and therefore not
    marked with __THROW.  */
 extern struct tm *getdate (const char *__string);
-# endif
+#endif
 
-# ifdef __USE_GNU
+#ifdef __USE_GNU
 /* Since `getdate' is not reentrant because of the use of `getdate_err'
    and the static buffer to return the result in, we provide a thread-safe
    variant.  The functionality is the same.  The result is returned in
@@ -425,10 +302,8 @@ extern struct tm *getdate (const char *__string);
    therefore not marked with __THROW.  */
 extern int getdate_r (const char *__restrict __string,
 		      struct tm *__restrict __resbufp);
-# endif
+#endif
 
 __END_DECLS
 
-#endif /* <time.h> included.  */
-
-#endif /* <time.h> not already included.  */
+#endif /* time.h.  */
diff --git a/time/timegm.c b/time/timegm.c
index c5656e84dc..fb720e2d7d 100644
--- a/time/timegm.c
+++ b/time/timegm.c
@@ -1,6 +1,6 @@
 /* Convert UTC calendar time to simple time.  Like mktime but assumes UTC.
 
-   Copyright (C) 1994-2016 Free Software Foundation, Inc.
+   Copyright (C) 1994-2018 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
diff --git a/time/timespec_get.c b/time/timespec_get.c
index fb9cc07a87..50843f9b58 100644
--- a/time/timespec_get.c
+++ b/time/timespec_get.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 2011-2016 Free Software Foundation, Inc.
+/* Copyright (C) 2011-2018 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
diff --git a/time/tst-ftime.c b/time/tst-ftime.c
index 9b8cb7856d..74e6d1cea3 100644
--- a/time/tst-ftime.c
+++ b/time/tst-ftime.c
@@ -1,5 +1,5 @@
 /* Verify that ftime is sane.
-   Copyright (C) 2014-2016 Free Software Foundation, Inc.
+   Copyright (C) 2014-2018 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
diff --git a/time/tst-getdate.c b/time/tst-getdate.c
index 7709acdc1c..53843602b1 100644
--- a/time/tst-getdate.c
+++ b/time/tst-getdate.c
@@ -1,5 +1,5 @@
 /* Test for getdate.
-   Copyright (C) 2000-2016 Free Software Foundation, Inc.
+   Copyright (C) 2000-2018 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Andreas Jaeger <aj@suse.de>, 2000.
 
diff --git a/time/tst-posixtz.c b/time/tst-posixtz.c
index 16aa19d654..9bec7ae4bb 100644
--- a/time/tst-posixtz.c
+++ b/time/tst-posixtz.c
@@ -2,6 +2,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <time.h>
+#include <stdint.h>
 
 struct
 {
diff --git a/time/tst-strptime-whitespace.c b/time/tst-strptime-whitespace.c
index f1442de8e8..6cfcc2f806 100644
--- a/time/tst-strptime-whitespace.c
+++ b/time/tst-strptime-whitespace.c
@@ -1,6 +1,6 @@
 /* Verify that strptime accepts arbitrary whitespace between tokens.
 
-   Copyright (C) 2013-2016 Free Software Foundation, Inc.
+   Copyright (C) 2013-2018 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
diff --git a/time/tst-strptime.c b/time/tst-strptime.c
index 3b94c2eb53..441e04b454 100644
--- a/time/tst-strptime.c
+++ b/time/tst-strptime.c
@@ -1,5 +1,5 @@
 /* Test for strptime.
-   Copyright (C) 1998-2016 Free Software Foundation, Inc.
+   Copyright (C) 1998-2018 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
 
@@ -51,6 +51,28 @@ static const struct
     6, 0, 0, 1 },
   { "ja_JP.EUC-JP", "2001 20 \xb7\xee", "%Y %U %a", 1, 140, 4, 21 },
   { "ja_JP.EUC-JP", "2001 21 \xb7\xee", "%Y %W %a", 1, 140, 4, 21 },
+  /* Most of the languages do not need the declension of the month names
+     and do not distinguish between %B and %OB.  */
+  { "en_US.ISO-8859-1", "November 17, 2017", "%B %e, %Y", 5, 320, 10, 17 },
+  { "de_DE.ISO-8859-1", "18. Nov 2017", "%d. %b %Y", 6, 321, 10, 18 },
+  { "fr_FR.UTF-8", "19 novembre 2017", "%d %OB %Y", 0, 322, 10, 19 },
+  { "es_ES.UTF-8", "20 de nov de 2017", "%d de %Ob de %Y", 1, 323, 10, 20 },
+  /* Some languages do need the declension of the month names.  */
+  { "pl_PL.UTF-8", "21 lis 2017", "%d %b %Y", 2, 324, 10, 21 },
+  { "pl_PL.UTF-8", "22 LIS 2017", "%d %B %Y", 3, 325, 10, 22 },
+  { "pl_PL.UTF-8", "23 listopada 2017", "%d %B %Y", 4, 326, 10, 23 },
+  /* The nominative case is incorrect here but it is parseable.  */
+  { "pl_PL.UTF-8", "24 listopad 2017", "%d %OB %Y", 5, 327, 10, 24 },
+  { "pl_PL.UTF-8", "25 lis 2017", "%d %Ob %Y", 6, 328, 10, 25 },
+  /* ноя - pronounce: 'noya' - "Nov" (abbreviated "November") in Russian.  */
+  { "ru_RU.UTF-8", "26 ноя 2017", "%d %b %Y", 0, 329, 10, 26 },
+  /* мая - pronounce: 'maya' - "of May" (the genitive case, both full and
+     abbreviated) in Russian.  */
+  { "ru_RU.UTF-8", "19 мая 2018", "%d %b %Y", 6, 138, 4, 19 },
+  /* май - pronounce: 'may' - "May" (the nominative case, both full and
+     abbreviated) in Russian.
+     The nominative case is incorrect here but it is parseable.  */
+  { "ru_RU.UTF-8", "20 май 2018", "%d %Ob %Y", 0, 139, 4, 20 },
 };
 
 
diff --git a/time/tst-strptime2.c b/time/tst-strptime2.c
index 7fe7350024..8019e7f5d8 100644
--- a/time/tst-strptime2.c
+++ b/time/tst-strptime2.c
@@ -4,6 +4,7 @@
 #include <stdbool.h>
 #include <stdio.h>
 #include <time.h>
+#include <libc-diag.h>
 
 /* Dummy string is used to match strptime's %s specifier.  */
 
@@ -67,10 +68,20 @@ mkbuf (char *buf, bool neg, bool colon, unsigned int hhmm, size_t ndigits)
   long int expect = LONG_MAX;
 
   i = sprintf (buf, "%s %c", dummy_string, sign);
+#if __GNUC_PREREQ (7, 0)
+  /* GCC issues a warning when it thinks the snprintf buffer may be too short.
+     This test is explicitly using short buffers to force snprintf to truncate
+     the output so we ignore the warnings.  */
+  DIAG_PUSH_NEEDS_COMMENT;
+  DIAG_IGNORE_NEEDS_COMMENT (7.0, "-Wformat-truncation");
+#endif
   if (colon)
     snprintf (buf + i, ndigits + 2, "%02u:%02u", hh, mm);
   else
     snprintf (buf + i, ndigits + 1, "%04u", hhmm);
+#if __GNUC_PREREQ (7, 0)
+  DIAG_POP_NEEDS_COMMENT;
+#endif
 
   if (mm <= mm_max && (ndigits == 2 || ndigits == 4))
     {
diff --git a/time/tst-tzname.c b/time/tst-tzname.c
index ea7ec927b2..f3c3757060 100644
--- a/time/tst-tzname.c
+++ b/time/tst-tzname.c
@@ -1,5 +1,5 @@
 /* Test that tzset sets tzname correctly (BZ #19253).
-   Copyright (C) 2015 Free Software Foundation, Inc.
+   Copyright (C) 2015-2018 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
diff --git a/time/tst-y2039.c b/time/tst-y2039.c
new file mode 100644
index 0000000000..cdc6bca54b
--- /dev/null
+++ b/time/tst-y2039.c
@@ -0,0 +1,46 @@
+/* Test for localtime bug in year 2039 (bug 22639).
+   Copyright (C) 2017-2018 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/>.  */
+
+#include <time.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <support/check.h>
+
+static int
+do_test (void)
+{
+  TEST_VERIFY_EXIT (setenv ("TZ", "PST8PDT,M3.2.0,M11.1.0", 1) == 0);
+  tzset ();
+  if (sizeof (time_t) > 4)
+    {
+      time_t ouch = (time_t) 2187810000LL;
+      char buf[500];
+      struct tm *tm = localtime (&ouch);
+      TEST_VERIFY_EXIT (tm != NULL);
+      TEST_VERIFY_EXIT (strftime (buf, sizeof buf, "%Y-%m-%d %H:%M:%S %Z", tm)
+			> 0);
+      puts (buf);
+      TEST_VERIFY (strcmp (buf, "2039-04-30 14:00:00 PDT") == 0);
+    }
+  else
+    FAIL_UNSUPPORTED ("32-bit time_t");
+  return 0;
+}
+
+#include <support/test-driver.c>
diff --git a/time/tzfile.c b/time/tzfile.c
index 9049878399..2a385b92bc 100644
--- a/time/tzfile.c
+++ b/time/tzfile.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1991-2016 Free Software Foundation, Inc.
+/* Copyright (C) 1991-2018 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
@@ -26,7 +26,6 @@
 #include <sys/stat.h>
 #include <stdint.h>
 
-#define	NOID
 #include <timezone/tzfile.h>
 
 int __use_tzfile;
@@ -45,14 +44,12 @@ struct ttinfo
 
 struct leap
   {
-    time_t transition;		/* Time the transition takes effect.  */
+    internal_time_t transition;	/* Time the transition takes effect.  */
     long int change;		/* Seconds of correction to apply.  */
   };
 
-static void compute_tzname_max (size_t) internal_function;
-
 static size_t num_transitions;
-libc_freeres_ptr (static time_t *transitions);
+libc_freeres_ptr (static internal_time_t *transitions);
 static unsigned char *type_idxs;
 static size_t num_types;
 static struct ttinfo *types;
@@ -116,8 +113,8 @@ __tzfile_read (const char *file, size_t extra, char **extrap)
   size_t tzspec_len;
   char *new = NULL;
 
-  if (sizeof (time_t) != 4 && sizeof (time_t) != 8)
-    abort ();
+  _Static_assert (sizeof (internal_time_t) == 8,
+		  "internal_time_t must be eight bytes");
 
   __use_tzfile = 0;
 
@@ -203,9 +200,7 @@ __tzfile_read (const char *file, size_t extra, char **extrap)
   if (__glibc_unlikely (num_isstd > num_types || num_isgmt > num_types))
     goto lose;
 
-  /* For platforms with 64-bit time_t we use the new format if available.  */
-  if (sizeof (time_t) == 8 && trans_width == 4
-      && tzhead.tzh_version[0] != '\0')
+  if (trans_width == 4 && tzhead.tzh_version[0] != '\0')
     {
       /* We use the 8-byte format.  */
       trans_width = 8;
@@ -225,9 +220,9 @@ __tzfile_read (const char *file, size_t extra, char **extrap)
 
   if (__builtin_expect (num_transitions
 			> ((SIZE_MAX - (__alignof__ (struct ttinfo) - 1))
-			   / (sizeof (time_t) + 1)), 0))
+			   / (sizeof (internal_time_t) + 1)), 0))
     goto lose;
-  total_size = num_transitions * (sizeof (time_t) + 1);
+  total_size = num_transitions * (sizeof (internal_time_t) + 1);
   total_size = ((total_size + __alignof__ (struct ttinfo) - 1)
 		& ~(__alignof__ (struct ttinfo) - 1));
   types_idx = total_size;
@@ -249,7 +244,7 @@ __tzfile_read (const char *file, size_t extra, char **extrap)
     goto lose;
   total_size += num_leaps * sizeof (struct leap);
   tzspec_len = 0;
-  if (sizeof (time_t) == 8 && trans_width == 8)
+  if (trans_width == 8)
     {
       off_t rem = st.st_size - __ftello (f);
       if (__builtin_expect (rem < 0
@@ -279,23 +274,23 @@ __tzfile_read (const char *file, size_t extra, char **extrap)
 
   /* Allocate enough memory including the extra block requested by the
      caller.  */
-  transitions = (time_t *) malloc (total_size + tzspec_len + extra);
+  transitions = malloc (total_size + tzspec_len + extra);
   if (transitions == NULL)
     goto lose;
 
   type_idxs = (unsigned char *) transitions + (num_transitions
-					       * sizeof (time_t));
+					       * sizeof (internal_time_t));
   types = (struct ttinfo *) ((char *) transitions + types_idx);
   zone_names = (char *) types + num_types * sizeof (struct ttinfo);
   leaps = (struct leap *) ((char *) transitions + leaps_idx);
-  if (sizeof (time_t) == 8 && trans_width == 8)
+  if (trans_width == 8)
     tzspec = (char *) leaps + num_leaps * sizeof (struct leap) + extra;
   else
     tzspec = NULL;
   if (extra > 0)
     *extrap = (char *) &leaps[num_leaps];
 
-  if (sizeof (time_t) == 4 || __builtin_expect (trans_width == 8, 1))
+  if (__builtin_expect (trans_width == 8, 1))
     {
       if (__builtin_expect (__fread_unlocked (transitions, trans_width + 1,
 					      num_transitions, f)
@@ -318,19 +313,17 @@ __tzfile_read (const char *file, size_t extra, char **extrap)
     if (__glibc_unlikely (type_idxs[i] >= num_types))
       goto lose;
 
-  if ((BYTE_ORDER != BIG_ENDIAN && (sizeof (time_t) == 4 || trans_width == 4))
-      || (BYTE_ORDER == BIG_ENDIAN && sizeof (time_t) == 8
-	  && trans_width == 4))
+  if (trans_width == 4)
     {
       /* Decode the transition times, stored as 4-byte integers in
-	 network (big-endian) byte order.  We work from the end of
-	 the array so as not to clobber the next element to be
-	 processed when sizeof (time_t) > 4.  */
+	 network (big-endian) byte order.  We work from the end of the
+	 array so as not to clobber the next element to be
+	 processed.  */
       i = num_transitions;
       while (i-- > 0)
 	transitions[i] = decode ((char *) transitions + i * 4);
     }
-  else if (BYTE_ORDER != BIG_ENDIAN && sizeof (time_t) == 8)
+  else if (BYTE_ORDER != BIG_ENDIAN)
     {
       /* Decode the transition times, stored as 8-byte integers in
 	 network (big-endian) byte order.  */
@@ -346,11 +339,11 @@ __tzfile_read (const char *file, size_t extra, char **extrap)
 					      sizeof (x), f) != sizeof (x),
 			    0))
 	goto lose;
-      c = getc_unlocked (f);
+      c = __getc_unlocked (f);
       if (__glibc_unlikely ((unsigned int) c > 1u))
 	goto lose;
       types[i].isdst = c;
-      c = getc_unlocked (f);
+      c = __getc_unlocked (f);
       if (__glibc_unlikely ((size_t) c > chars))
 	/* Bogus index in data file.  */
 	goto lose;
@@ -367,10 +360,10 @@ __tzfile_read (const char *file, size_t extra, char **extrap)
       if (__builtin_expect (__fread_unlocked (x, 1, trans_width, f)
 			    != trans_width, 0))
 	goto lose;
-      if (sizeof (time_t) == 4 || trans_width == 4)
-	leaps[i].transition = (time_t) decode (x);
+      if (trans_width == 4)
+	leaps[i].transition = decode (x);
       else
-	leaps[i].transition = (time_t) decode64 (x);
+	leaps[i].transition = decode64 (x);
 
       if (__glibc_unlikely (__fread_unlocked (x, 1, 4, f) != 4))
 	goto lose;
@@ -379,7 +372,7 @@ __tzfile_read (const char *file, size_t extra, char **extrap)
 
   for (i = 0; i < num_isstd; ++i)
     {
-      int c = getc_unlocked (f);
+      int c = __getc_unlocked (f);
       if (__glibc_unlikely (c == EOF))
 	goto lose;
       types[i].isstd = c != 0;
@@ -389,7 +382,7 @@ __tzfile_read (const char *file, size_t extra, char **extrap)
 
   for (i = 0; i < num_isgmt; ++i)
     {
-      int c = getc_unlocked (f);
+      int c = __getc_unlocked (f);
       if (__glibc_unlikely (c == EOF))
 	goto lose;
       types[i].isgmt = c != 0;
@@ -398,62 +391,16 @@ __tzfile_read (const char *file, size_t extra, char **extrap)
     types[i++].isgmt = 0;
 
   /* Read the POSIX TZ-style information if possible.  */
-  if (sizeof (time_t) == 8 && tzspec != NULL)
+  if (tzspec != NULL)
     {
       /* Skip over the newline first.  */
-      if (getc_unlocked (f) != '\n'
+      if (__getc_unlocked (f) != '\n'
 	  || (__fread_unlocked (tzspec, 1, tzspec_len - 1, f)
 	      != tzspec_len - 1))
 	tzspec = NULL;
       else
 	tzspec[tzspec_len - 1] = '\0';
     }
-  else if (sizeof (time_t) == 4 && tzhead.tzh_version[0] != '\0')
-    {
-      /* Get the TZ string.  */
-      if (__builtin_expect (__fread_unlocked ((void *) &tzhead,
-					      sizeof (tzhead), 1, f) != 1, 0)
-	  || (memcmp (tzhead.tzh_magic, TZ_MAGIC, sizeof (tzhead.tzh_magic))
-	      != 0))
-	goto lose;
-
-      size_t num_transitions2 = (size_t) decode (tzhead.tzh_timecnt);
-      size_t num_types2 = (size_t) decode (tzhead.tzh_typecnt);
-      size_t chars2 = (size_t) decode (tzhead.tzh_charcnt);
-      size_t num_leaps2 = (size_t) decode (tzhead.tzh_leapcnt);
-      size_t num_isstd2 = (size_t) decode (tzhead.tzh_ttisstdcnt);
-      size_t num_isgmt2 = (size_t) decode (tzhead.tzh_ttisgmtcnt);
-
-      /* Position the stream before the second header.  */
-      size_t to_skip = (num_transitions2 * (8 + 1)
-			+ num_types2 * 6
-			+ chars2
-			+ num_leaps2 * 12
-			+ num_isstd2
-			+ num_isgmt2);
-      off_t off;
-      if (fseek (f, to_skip, SEEK_CUR) != 0
-	  || (off = __ftello (f)) < 0
-	  || st.st_size < off + 2)
-	goto lose;
-
-      tzspec_len = st.st_size - off - 1;
-      if (tzspec_len == 0)
-	goto lose;
-      char *tzstr = malloc (tzspec_len);
-      if (tzstr == NULL)
-	goto lose;
-      if (getc_unlocked (f) != '\n'
-	  || (__fread_unlocked (tzstr, 1, tzspec_len - 1, f)
-	      != tzspec_len - 1))
-	{
-	  free (tzstr);
-	  goto lose;
-	}
-      tzstr[tzspec_len - 1] = '\0';
-      tzspec = __tzstring (tzstr);
-      free (tzstr);
-    }
 
   /* Don't use an empty TZ string.  */
   if (tzspec != NULL && tzspec[0] == '\0')
@@ -495,8 +442,6 @@ __tzfile_read (const char *file, size_t extra, char **extrap)
   if (__tzname[1] == NULL)
     __tzname[1] = __tzname[0];
 
-  compute_tzname_max (chars);
-
   if (num_transitions == 0)
     /* Use the first rule (which should also be the only one).  */
     rule_stdoff = rule_dstoff = types[0].offset;
@@ -627,8 +572,6 @@ __tzfile_default (const char *std, const char *dst,
   /* Set the timezone.  */
   __timezone = -types[0].offset;
 
-  compute_tzname_max (stdlen + dstlen);
-
   /* Invalidate the tzfile attribute cache to force rereading
      TZDEFRULES the next time it is used.  */
   tzfile_dev = 0;
@@ -637,7 +580,7 @@ __tzfile_default (const char *std, const char *dst,
 }
 
 void
-__tzfile_compute (time_t timer, int use_localtime,
+__tzfile_compute (internal_time_t timer, int use_localtime,
 		  long int *leap_correct, int *leap_hit,
 		  struct tm *tp)
 {
@@ -692,10 +635,16 @@ __tzfile_compute (time_t timer, int use_localtime,
 
 	  /* Convert to broken down structure.  If this fails do not
 	     use the string.  */
-	  if (__glibc_unlikely (! __offtime (&timer, 0, tp)))
-	    goto use_last;
-
-	  /* Use the rules from the TZ string to compute the change.  */
+	  {
+	    time_t truncated = timer;
+	    if (__glibc_unlikely (truncated != timer
+				  || ! __offtime (&truncated, 0, tp)))
+	      goto use_last;
+	  }
+
+	  /* Use the rules from the TZ string to compute the change.
+	     timer fits into time_t due to the truncation check
+	     above.  */
 	  __tz_compute (timer, tp, 1);
 
 	  /* If tzspec comes from posixrules loaded by __tzfile_default,
@@ -716,10 +665,12 @@ __tzfile_compute (time_t timer, int use_localtime,
 	     then pick the type of the transition before it.  */
 	  size_t lo = 0;
 	  size_t hi = num_transitions - 1;
-	  /* Assume that DST is changing twice a year and guess initial
-	     search spot from it.
-	     Half of a gregorian year has on average 365.2425 * 86400 / 2
-	     = 15778476 seconds.  */
+	  /* Assume that DST is changing twice a year and guess
+	     initial search spot from it.  Half of a gregorian year
+	     has on average 365.2425 * 86400 / 2 = 15778476 seconds.
+	     The value i can be truncated if size_t is smaller than
+	     internal_time_t, but this is harmless because it is just
+	     a guess.  */
 	  i = (transitions[num_transitions - 1] - timer) / 15778476;
 	  if (i < num_transitions)
 	    {
@@ -837,21 +788,3 @@ __tzfile_compute (time_t timer, int use_localtime,
 	}
     }
 }
-
-static void
-internal_function
-compute_tzname_max (size_t chars)
-{
-  const char *p;
-
-  p = zone_names;
-  do
-    {
-      const char *start = p;
-      while (*p != '\0')
-	++p;
-      if ((size_t) (p - start) > __tzname_cur_max)
-	__tzname_cur_max = p - start;
-    }
-  while (++p < &zone_names[chars]);
-}
diff --git a/time/tzset.c b/time/tzset.c
index f65116ce24..a828b9fb75 100644
--- a/time/tzset.c
+++ b/time/tzset.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1991-2016 Free Software Foundation, Inc.
+/* Copyright (C) 1991-2018 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
@@ -25,10 +25,10 @@
 #include <string.h>
 #include <time.h>
 
-
-#define NOID
 #include <timezone/tzfile.h>
 
+#define SECSPERDAY ((time_t) 86400)
+
 char *__tzname[2] = { (char *) "GMT", (char *) "GMT" };
 int __daylight = 0;
 long int __timezone = 0L;
@@ -40,12 +40,6 @@ weak_alias (__timezone, timezone)
 /* This locks all the state variables in tzfile.c and this file.  */
 __libc_lock_define_initialized (static, tzset_lock)
 
-
-#define	min(a, b)	((a) < (b) ? (a) : (b))
-#define	max(a, b)	((a) > (b) ? (a) : (b))
-#define	sign(x)		((x) < 0 ? -1 : 1)
-
-
 /* This structure contains all the information about a
    timezone given in the POSIX standard TZ envariable.  */
 typedef struct
@@ -69,9 +63,8 @@ typedef struct
 static tz_rule tz_rules[2];
 
 
-static void compute_change (tz_rule *rule, int year) __THROW internal_function;
-static void tzset_internal (int always, int explicit)
-     __THROW internal_function;
+static void compute_change (tz_rule *rule, int year) __THROW;
+static void tzset_internal (int always);
 
 /* List of buffers containing time zone strings. */
 struct tzstring_l
@@ -128,50 +121,29 @@ __tzstring (const char *s)
 {
   return __tzstring_len (s, strlen (s));
 }
-
-/* Maximum length of a timezone name.  tzset_internal keeps this up to date
-   (never decreasing it) when ! __use_tzfile.
-   tzfile.c keeps it up to date when __use_tzfile.  */
-size_t __tzname_cur_max;
-
-long int
-__tzname_max (void)
-{
-  __libc_lock_lock (tzset_lock);
-
-  tzset_internal (0, 0);
-
-  __libc_lock_unlock (tzset_lock);
 
-  return __tzname_cur_max;
-}
-
 static char *old_tz;
 
 static void
-internal_function
 update_vars (void)
 {
   __daylight = tz_rules[0].offset != tz_rules[1].offset;
   __timezone = -tz_rules[0].offset;
   __tzname[0] = (char *) tz_rules[0].name;
   __tzname[1] = (char *) tz_rules[1].name;
-
-  /* Keep __tzname_cur_max up to date.  */
-  size_t len0 = strlen (__tzname[0]);
-  size_t len1 = strlen (__tzname[1]);
-  if (len0 > __tzname_cur_max)
-    __tzname_cur_max = len0;
-  if (len1 > __tzname_cur_max)
-    __tzname_cur_max = len1;
 }
 
 
 static unsigned int
-__attribute_noinline__
 compute_offset (unsigned int ss, unsigned int mm, unsigned int hh)
 {
-  return min (ss, 59) + min (mm, 59) * 60 + min (hh, 24) * 60 * 60;
+  if (ss > 59)
+    ss = 59;
+  if (mm > 59)
+    mm = 59;
+  if (hh > 24)
+    hh = 24;
+  return ss + mm * 60 + hh * 60 * 60;
 }
 
 /* Parses the time zone name at *TZP, and writes a pointer to an
@@ -393,8 +365,7 @@ __tzset_parse_tz (const char *tz)
 
 /* Interpret the TZ envariable.  */
 static void
-internal_function
-tzset_internal (int always, int explicit)
+tzset_internal (int always)
 {
   static int is_initialized;
   const char *tz;
@@ -405,12 +376,6 @@ tzset_internal (int always, int explicit)
 
   /* Examine the TZ environment variable.  */
   tz = getenv ("TZ");
-  if (tz == NULL && !explicit)
-    /* Use the site-wide default.  This is a file name which means we
-       would not see changes to the file if we compare only the file
-       name for change.  We want to notice file changes if tzset() has
-       been called explicitly.  Leave TZ as NULL in this case.  */
-    tz = TZDEFAULT;
   if (tz && *tz == '\0')
     /* User specified the empty string; use UTC explicitly.  */
     tz = "Universal";
@@ -463,7 +428,6 @@ tzset_internal (int always, int explicit)
    when the change described by RULE will occur and
    put it in RULE->change, saving YEAR in RULE->computed_for.  */
 static void
-internal_function
 compute_change (tz_rule *rule, int year)
 {
   time_t t;
@@ -552,7 +516,6 @@ compute_change (tz_rule *rule, int year)
 /* Figure out the correct timezone for TM and set `__tzname',
    `__timezone', and `__daylight' accordingly.  */
 void
-internal_function
 __tz_compute (time_t timer, struct tm *tm, int use_localtime)
 {
   compute_change (&tz_rules[0], 1900 + tm->tm_year);
@@ -586,7 +549,7 @@ __tzset (void)
 {
   __libc_lock_lock (tzset_lock);
 
-  tzset_internal (1, 1);
+  tzset_internal (1);
 
   if (!__use_tzfile)
     {
@@ -618,7 +581,7 @@ __tz_convert (const time_t *timer, int use_localtime, struct tm *tp)
   /* Update internal database according to current TZ setting.
      POSIX.1 8.3.7.2 says that localtime_r is not required to set tzname.
      This is a good idea since this allows at least a bit more parallelism.  */
-  tzset_internal (tp == &_tmbuf && use_localtime, 1);
+  tzset_internal (tp == &_tmbuf && use_localtime);
 
   if (__use_tzfile)
     __tzfile_compute (*timer, use_localtime, &leap_correction,
diff --git a/time/wcsftime.c b/time/wcsftime.c
index a8f06f1d62..5a3afeabfc 100644
--- a/time/wcsftime.c
+++ b/time/wcsftime.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1991-2016 Free Software Foundation, Inc.
+/* Copyright (C) 1991-2018 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
diff --git a/time/wcsftime_l.c b/time/wcsftime_l.c
index f7714174a7..b667893b71 100644
--- a/time/wcsftime_l.c
+++ b/time/wcsftime_l.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 2002-2016 Free Software Foundation, Inc.
+/* Copyright (C) 2002-2018 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