New optional ZONE arg for format-time-string etc.

This simplifies time conversions in other time zones.
It also prevents display-time-world tampering with TZ (Bug#21020).
* admin/admin.el (add-release-logs):
Use improved add-log-time-format API.
* admin/merge-gnulib (GNULIB_MODULES): Add time_rz, timegm.
(GNULIB_TOOL_FLAGS): Avoid flexmember, setenv, unsetenv.
* configure.ac (tzalloc): Remove test for this, since
Emacs no longer uses HAVE_TZALLOC directly.
* doc/lispref/os.texi (Time of Day, Time Conversion)
(Time Parsing):
* etc/NEWS: Document the new behavior.
Merge from gnulib, incorporating:
2015-07-25 strftime: fix newly-introduced bug on Solaris
2015-07-23 fprintftime, strftime: use timezone_t args
* lib/gnulib.mk, m4/gnulib-comp.m4: Regenerate.
* lib/strftime.c, lib/strftime.h, lib/time.in.h, m4/sys_time_h.m4:
* m4/time_h.m4:
Update from gnulib.
* lib/time_rz.c, lib/timegm.c, m4/time_rz.m4, m4/timegm.m4:
New files from gnulib.
* lisp/time-stamp.el (time-stamp-string):
* lisp/time.el (display-time-world-list)
(display-time-world-display):
Use new API, with time zone arg.
* lisp/time.el (display-time-world-display):
Fix race when current-time advances while we're running.
* lisp/vc/add-log.el (add-log-iso8601-time-zone)
(add-log-iso8601-time-string): Accept optional time zone arg.
* lisp/vc/add-log.el (add-change-log-entry):
* lisp/vc/log-edit.el (log-edit-changelog-ours-p): Use new arg.
* nt/gnulib.mk: Propagate lib/gnulib.mk changes here.
Add rules for the time module, since they're now needed
for tzalloc etc.
* src/conf_post.h (getenv_TZ, setenv_TZ): New macros.
(emacs_getenv_TZ, emacs_setenv_TZ): New decls.
* src/editfns.c: Include errno.h.
(set_time_zone_rule): Omit unnecessary forward decl.
(initial_tz): Remove, replacing with ...
(local_tz, wall_clock_tz, utc_tz): New static vars and constants.
(tzeqlen): New constant; prefer it to (sizeof "TZ=" - 1).
(emacs_localtime_rz, emacs_mktime_z, xtzalloc, xtzfree)
(tzlookup): New static functions.
(init_editfns): New arg DUMPING.  All uses changed.
(init_editfns): Omit most initialization if dumping, not if
!initialized.  Initialize wall_clock_tz and local_tz.
(emacs_nmemftime, format_time_string): Time zone argument can now
be any time zone, not just a boolean for UTC or local time.  All
callers changed.
(Fformat_time_string, Fencode_time, Fcurrent_time_string)
(Fcurrent_time_zone): New optional arg ZONE.
(Fdecode_time, Fset_time_zone_rule): ZONE arg can now also take
the same form as with the other new additions.
(decode_time_zone): Remove; no longer needed.
(tzvalbuf): Now file-scope.
(emacs_getenv_TZ, emacs_setenv_TZ): New functions.
(syms_of_editfns): Define Qwall.
* src/editfns.c (mktime_z) [!HAVE_TZALLOC]:
* src/systime.h (mktime_z, timezone_t, tzalloc, tzfree)
[!HAVE_TZALLOC]:
Remove; now supplied by gnulib.
* src/emacs.c (main):
* src/lisp.h (init_editfns): Adjust to init_editfns API change.

2 files changed, 6 insertions, 8 deletions

diff --git a/admin/admin.el b/admin/admin.el
index 93e9124ce8d..267f2c4afea 100644
--- a/admin/admin.el
+++ b/admin/admin.el
@@ -38,14 +38,12 @@ Optional argument DATE is the release date, default today."
                                           emacs-minor-version))
                      (read-string "Release date: "
                                   (progn (require 'add-log)
-                                         (let ((add-log-time-zone-rule t))
-                                           (funcall add-log-time-format))))))
+                                         (funcall add-log-time-format nil t)))))
   (setq root (expand-file-name root))
   (unless (file-exists-p (expand-file-name "src/emacs.c" root))
     (user-error "%s doesn't seem to be the root of an Emacs source tree" root))
   (require 'add-log)
-  (or date (setq date (let ((add-log-time-zone-rule t))
-                        (funcall add-log-time-format))))
+  (or date (setq date (funcall add-log-time-format nil t)))
   (let* ((logs (process-lines "find" root "-name" "ChangeLog"))
          (entry (format "%s  %s  <%s>\n\n\t* Version %s released.\n\n"
                         date
diff --git a/admin/merge-gnulib b/admin/merge-gnulib
index e7910a642c7..963c3a06e1a 100755
--- a/admin/merge-gnulib
+++ b/admin/merge-gnulib
@@ -37,20 +37,20 @@ GNULIB_MODULES='
   pipe2 pselect pthread_sigmask putenv qcopy-acl readlink readlinkat
   sig2str socklen stat-time stdalign stddef stdio
   stpcpy strftime strtoimax strtoumax symlink sys_stat
-  sys_time time time_r timer-time timespec-add timespec-sub
+  sys_time time time_r time_rz timegm timer-time timespec-add timespec-sub
   unsetenv update-copyright utimens
   vla warnings
 '
 
 GNULIB_TOOL_FLAGS='
   --avoid=close --avoid=dup
-  --avoid=fchdir --avoid=fstat
+  --avoid=fchdir --avoid=flexmember --avoid=fstat
   --avoid=malloc-posix --avoid=msvc-inval --avoid=msvc-nothrow
   --avoid=open --avoid=openat-die --avoid=opendir
   --avoid=raise
-  --avoid=save-cwd --avoid=select --avoid=sigprocmask
+  --avoid=save-cwd --avoid=select --avoid=setenv --avoid=sigprocmask
   --avoid=stdarg --avoid=stdbool
-  --avoid=threadlib
+  --avoid=threadlib --avoid=unsetenv
   --conditional-dependencies --import --no-changelog --no-vc-files
   --makefile-name=gnulib.mk
 '