bug#35502: 27.0.50; encode-time apparently stopped working

bug#35502: 27.0.50; encode-time apparently stopped working

[Marcin Borkowski]

M-: (encode-time (decode-time)) RET

yields

(error "Specified time is not representable")

The backtrace says that `encode-time' was called with the following
argument:

encode-time((57 20 11 30 4 2019 2 t 7200))




In GNU Emacs 27.0.50 (build 27, x86_64-pc-linux-gnu, GTK+ Version 3.24.8)
 of 2019-04-30 built on tars
Repository revision: f478082f9ff22ff41fbd9616ebea75757f9a0311
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12004000
System Description: Arch Linux

Recent messages:
Mark set
Parsing /home/mbork/.mailrc... done
Mark set [3 times]
[mu4e] Started mu4e with 139690 messages in store
Quit [2 times]
Clock stopped at [2019-04-30 wto 11:18] after 0:04
Beeminder: submitting datapoint of 4 for goal coding...done
Quit [3 times]
(23752 4895)
Quit [2 times]
(51 19 11 30 4 2019 2 t 7200)
Configured using:
 'configure --with-xwidgets --with-xaw3d'

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GSETTINGS GLIB
NOTIFY INOTIFY ACL GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB
TOOLKIT_SCROLL_BARS GTK3 X11 XDBE XIM THREADS XWIDGETS LIBSYSTEMD JSON
PDUMPER LCMS2 GMP

Important settings:
  value of $LC_COLLATE: pl_PL.UTF-8
  value of $LC_CTYPE: pl_PL.UTF-8
  value of $LC_MESSAGES: en_US.UTF-8
  value of $LC_MONETARY: pl_PL.UTF-8
  value of $LC_NUMERIC: en_US.UTF-8
  value of $LC_TIME: pl_PL.UTF-8
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Emacs-Lisp

Minor modes in effect:
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  yas-global-mode: t
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  emc-mode: t
  savehist-mode: t
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  beeminder-org-integration-mode: t
  global-flycheck-mode: t
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  ivy-mode: t
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  shell-dirtrack-mode: t
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  tooltip-mode: t
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  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
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  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
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mu4e-message flow-fill mu4e-proc mu4e-utils doc-view jka-compr
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tramp-compat ucs-normalize shell pcomplete comint ansi-color ring
parse-time format-spec advice mule-util tex-site dired-dups-autoloads
dired-efap-autoloads git-gutter-fringe-autoloads fringe-helper-autoloads
git-gutter-autoloads htmlize-autoloads typopunct-autoloads info package
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eieio-core cl-macs eieio-loaddefs password-cache json subr-x map
url-vars seq byte-opt gv bytecomp byte-compile cconv cl-loaddefs cl-lib
tooltip eldoc electric uniquify ediff-hook vc-hooks lisp-float-type
mwheel term/x-win x-win term/common-win x-dnd tool-bar dnd fontset image
regexp-opt fringe tabulated-list replace newcomment text-mode elisp-mode
lisp-mode prog-mode register page menu-bar rfn-eshadow isearch timer
select scroll-bar mouse jit-lock font-lock syntax facemenu font-core
term/tty-colors frame cl-generic cham georgian utf-8-lang misc-lang
vietnamese tibetan thai tai-viet lao korean japanese eucjp-ms cp51932
hebrew greek romanian slovak czech european ethiopic indian cyrillic
chinese composite charscript charprop case-table epa-hook jka-cmpr-hook
help simple abbrev obarray minibuffer cl-preloaded nadvice loaddefs
button faces cus-face macroexp files text-properties overlay sha1 md5
base64 format env code-pages mule custom widget hashtable-print-readable
backquote threads dbusbind inotify lcms2 dynamic-setting
system-font-setting font-render-setting xwidget-internal move-toolbar
gtk x-toolkit x multi-tty make-network-process emacs)

Memory information:
((conses 16 802414 106737)
 (symbols 48 48386 3)
 (strings 32 212955 43942)
 (string-bytes 1 7717681)
 (vectors 16 143012)
 (vector-slots 8 2315095 52934)
 (floats 8 14646 2604)
 (intervals 56 7286 677)
 (buffers 992 37))

--
Marcin Borkowski
http://mbork.pl

bug#35502: 27.0.50; encode-time apparently stopped working

[Eli Zaretskii]

> From: Marcin Borkowski <mbork@mbork.pl>
> Date: Tue, 30 Apr 2019 11:23:23 +0200
> 
> M-: (encode-time (decode-time)) RET
> 
> yields
> 
> (error "Specified time is not representable")

I cannot reproduce this with today's master, neither on GNU/Linux nor
on MS-Windows.  Is this in "emacs -Q"?  If so, what happens if you
build a fresh checkout or bootstrap?

Also, what is your version of GCC?

bug#35502: 27.0.50; encode-time apparently stopped working

[Robert Pluim]

>>>>> On Tue, 30 Apr 2019 18:17:22 +0300, Eli Zaretskii <eliz@gnu.org> said:

    >> From: Marcin Borkowski <mbork@mbork.pl> Date: Tue, 30 Apr 2019
    >> 11:23:23 +0200
    >> 
    >> M-: (encode-time (decode-time)) RET
    >> 
    >> yields
    >> 
    >> (error "Specified time is not representable")

    Eli> I cannot reproduce this with today's master, neither on
    Eli> GNU/Linux nor on MS-Windows.  Is this in "emacs -Q"?  If so,
    Eli> what happens if you build a fresh checkout or bootstrap?

    Eli> Also, what is your version of GCC?

I see this, but only on macOS, not GNU/Linux:

Debugger entered--Lisp error: (error "Specified time is not representable")
  encode-time((29 31 17 30 4 2019 2 t 7200))

If I change that 't' to 'nil', it works:

    (encode-time '(29 31 17 30 4 2019 2 nil 7200))
    (23752 27217)

$ gcc -v
Configured with: --prefix=/Library/Developer/CommandLineTools/usr --with-gxx-include-dir=/usr/include/c++/4.2.1
Apple LLVM version 10.0.1 (clang-1001.0.46.4)
Target: x86_64-apple-darwin18.5.0
Thread model: posix
InstalledDir: /Library/Developer/CommandLineTools/usr/bin

Robert

bug#35502: 27.0.50; encode-time apparently stopped working

[Eli Zaretskii]

> From: Robert Pluim <rpluim@gmail.com>
> Cc: Marcin Borkowski <mbork@mbork.pl>,  35502@debbugs.gnu.org
> Date: Tue, 30 Apr 2019 17:39:32 +0200
> 
>     Eli> I cannot reproduce this with today's master, neither on
>     Eli> GNU/Linux nor on MS-Windows.  Is this in "emacs -Q"?  If so,
>     Eli> what happens if you build a fresh checkout or bootstrap?
> 
>     Eli> Also, what is your version of GCC?
> 
> I see this, but only on macOS, not GNU/Linux:
> 
> Debugger entered--Lisp error: (error "Specified time is not representable")
>   encode-time((29 31 17 30 4 2019 2 t 7200))
> 
> If I change that 't' to 'nil', it works:
> 
>     (encode-time '(29 31 17 30 4 2019 2 nil 7200))
>     (23752 27217)
> 
> $ gcc -v
> Configured with: --prefix=/Library/Developer/CommandLineTools/usr --with-gxx-include-dir=/usr/include/c++/4.2.1
> Apple LLVM version 10.0.1 (clang-1001.0.46.4)
> Target: x86_64-apple-darwin18.5.0
> Thread model: posix
> InstalledDir: /Library/Developer/CommandLineTools/usr/bin

Is this an optimized build or an unoptimized one?  If the former, can
you try rebuilding with __attribute((cold)) use disabled?  You can do
that in conf_post.h, where ATTRIBUTE_COLD is defined.

bug#35502: 27.0.50; encode-time apparently stopped working

[Robert Pluim]

>>>>> On Tue, 30 Apr 2019 18:43:48 +0300, Eli Zaretskii <eliz@gnu.org> said:

    Eli> Is this an optimized build or an unoptimized one?  If the
    Eli> former, can you try rebuilding with __attribute((cold)) use
    Eli> disabled?  You can do that in conf_post.h, where
    Eli> ATTRIBUTE_COLD is defined.

Itʼs an optimized build (-g3 -O2). Turning off ATTRIBUTE_COLD makes no
difference. Iʼll rebuild from scratch just to double check.

Robert

bug#35502: 27.0.50; encode-time apparently stopped working

[Eli Zaretskii]

> From: Robert Pluim <rpluim@gmail.com>
> Cc: mbork@mbork.pl,  35502@debbugs.gnu.org
> Date: Tue, 30 Apr 2019 17:55:55 +0200
> 
> >>>>> On Tue, 30 Apr 2019 18:43:48 +0300, Eli Zaretskii <eliz@gnu.org> said:
> 
>     Eli> Is this an optimized build or an unoptimized one?  If the
>     Eli> former, can you try rebuilding with __attribute((cold)) use
>     Eli> disabled?  You can do that in conf_post.h, where
>     Eli> ATTRIBUTE_COLD is defined.
> 
> Itʼs an optimized build (-g3 -O2). Turning off ATTRIBUTE_COLD makes no
> difference. Iʼll rebuild from scratch just to double check.

OK, so it's probably some problem with DST database?  What happens if
you use -1 instead of t or nil?

bug#35502: 27.0.50; encode-time apparently stopped working

[Robert Pluim]

>>>>> On Tue, 30 Apr 2019 19:08:20 +0300, Eli Zaretskii <eliz@gnu.org> said:

    Eli> OK, so it's probably some problem with DST database?  What
    Eli> happens if you use -1 instead of t or nil?

    (encode-time '(29 31 17 30 4 2019 2 -1 7200))
    (23752 27217)

Iʼm failing to follow the relevant code in timefns.c, but Iʼm tired.....

Robert

bug#35502: 27.0.50; encode-time apparently stopped working

[Marcin Borkowski]

On 2019-04-30, at 17:17, Eli Zaretskii <eliz@gnu.org> wrote:

>> From: Marcin Borkowski <mbork@mbork.pl>
>> Date: Tue, 30 Apr 2019 11:23:23 +0200
>> 
>> M-: (encode-time (decode-time)) RET
>> 
>> yields
>> 
>> (error "Specified time is not representable")
>
> I cannot reproduce this with today's master, neither on GNU/Linux nor
> on MS-Windows.  Is this in "emacs -Q"?  If so, what happens if you

Yes, "emacs -Q".

> build a fresh checkout or bootstrap?

What do I do to check that?

> Also, what is your version of GCC?

$ gcc --version
gcc (GCC) 8.3.0
Copyright (C) 2018 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

TIA,

-- 
Marcin Borkowski
http://mbork.pl

bug#35502: 27.0.50; encode-time apparently stopped working

[Eli Zaretskii]

> From: Marcin Borkowski <mbork@mbork.pl>
> Cc: 35502@debbugs.gnu.org
> Date: Tue, 30 Apr 2019 17:40:19 +0200
> 
> > build a fresh checkout or bootstrap?
> 
> What do I do to check that?

Just clone the repository anew and build it, or say "make bootstrap"
instead of just "make".

When (on what date) did the locale where you are doing this switched
to DST?

Thanks.

bug#35502: 27.0.50; encode-time apparently stopped working

[Paul Eggert]

[-- Attachment #1: Type: text/plain, Size: 306 bytes --]

Although I don't use macOS I rigged up a version of mktime on Fedora
that reproduced the problem. The bug I found doesn't have anything to do
with ATTRIBUTE_COLD; it's an unportable assumption in the
emacs/src/timefns.c. I installed the attached into master to fix the bug
I found; please give it a try.



[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #2: 0001-Fix-decode-time-encode-time-roundtrip-on-macOS.patch --]
[-- Type: text/x-patch; name="0001-Fix-decode-time-encode-time-roundtrip-on-macOS.patch", Size: 2058 bytes --]

From 325f51c84d9ad4d9776784bd324b347ffe4fe51b Mon Sep 17 00:00:00 2001
From: Paul Eggert <eggert@cs.ucla.edu>
Date: Tue, 30 Apr 2019 10:45:48 -0700
Subject: [PATCH] Fix decode-time/encode-time roundtrip on macOS
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

* src/timefns.c (Fencode_time): Ignore DST flag when the zone is
numeric or is a cons, as the doc string says it’s ignored in that
case, and not ignoring it causes encode-time to not invert
decode-time on some platforms (Bug#35502).
* test/src/timefns-tests.el (encode-time-dst-numeric-zone):
New test.
---
 src/timefns.c             | 5 +++--
 test/src/timefns-tests.el | 6 ++++++
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/src/timefns.c b/src/timefns.c
index 5005c73b7f..7b5af6a5d2 100644
--- a/src/timefns.c
+++ b/src/timefns.c
@@ -1488,10 +1488,11 @@ usage: (encode-time &optional TIME FORM &rest OBSOLESCENT-ARGUMENTS)  */)
       tm.tm_mon  = check_tm_member (XCAR (a), 1); a = XCDR (a);
       tm.tm_year = check_tm_member (XCAR (a), TM_YEAR_BASE); a = XCDR (a);
       a = XCDR (a);
-      if (SYMBOLP (XCAR (a)))
-	tm.tm_isdst = !NILP (XCAR (a));
+      Lisp_Object dstflag = XCAR (a);
       a = XCDR (a);
       zone = XCAR (a);
+      if (SYMBOLP (dstflag) && !FIXNUMP (zone) && !CONSP (zone))
+	tm.tm_isdst = !NILP (dstflag);
     }
   else if (nargs < 6)
     xsignal2 (Qwrong_number_of_arguments, Qencode_time, make_fixnum (nargs));
diff --git a/test/src/timefns-tests.el b/test/src/timefns-tests.el
index 5c858ef3bd..2c90af757f 100644
--- a/test/src/timefns-tests.el
+++ b/test/src/timefns-tests.el
@@ -142,3 +142,9 @@ timefns-tests--have-leap-seconds
 		      (< 0.99 (/ x y) 1.01)
 		      (< 0.99 (/ (- (float-time a)) (float-time b))
 			 1.01))))))))
+
+(ert-deftest encode-time-dst-numeric-zone ()
+    "Check for Bug#35502."
+    (should (time-equal-p
+             (encode-time '(29 31 17 30 4 2019 2 t 7200))
+             '(23752 27217))))
-- 
2.20.1

bug#35502: 27.0.50; encode-time apparently stopped working

[Robert Pluim]

>>>>> On Tue, 30 Apr 2019 10:54:48 -0700, Paul Eggert <eggert@cs.ucla.edu> said:

    Paul> Although I don't use macOS I rigged up a version of mktime
    Paul> on Fedora that reproduced the problem. The bug I found
    Paul> doesn't have anything to do with ATTRIBUTE_COLD; it's an
    Paul> unportable assumption in the emacs/src/timefns.c. I
    Paul> installed the attached into master to fix the bug I found;
    Paul> please give it a try.

My first reaction was "that¼s the wrong branch of the code, nargs ==
9", and then my brain reset. Time to walk away from the computer for a
while.

That patch fixes roundtripping for me, thanks.

    Paul> * src/timefns.c (Fencode_time): Ignore DST flag when the
    Paul> zone is numeric or is a cons, as the doc string says
    Paul> it€s ignored in that case, and not ignoring it
            ^^^
That shows as "\xe2\x80\x99" for me in Gnus. I thought commit messages
were supposed to be ASCII only?

Robert

bug#35502: 27.0.50; encode-time apparently stopped working

[Paul Eggert]

On 4/30/19 11:00 AM, Robert Pluim wrote:
> That patch fixes roundtripping for me, thanks.

Thanks for checking; closing the bug report.

> I thought commit messages were supposed to be ASCII only?

As far as I can tell we've been putting UTF-8 into commit messages for
fifteen years, and standardized on UTF-8 (as opposed to other non-ASCII
encodings) in 2015; there's a note in the CONTRIBUTE file to that effect.

>     That shows as "\xe2\x80\x99" for me in Gnus.

That charset botch is due to this Thunderbird bug:

https://bugzilla.mozilla.org/show_bug.cgi?id=1167982

I try to work around the bug by hand but forgot this time. Arguably Gnus
should do better here, since this is a reasonably-common problem that
has been biting people for years. I filed a Gnus problem report here:

https://debbugs.gnu.org/35507

bug#35502: 27.0.50; encode-time apparently stopped working

[Marcin Borkowski]

On 2019-04-30, at 21:40, Paul Eggert <eggert@cs.ucla.edu> wrote:

> On 4/30/19 11:00 AM, Robert Pluim wrote:
>> That patch fixes roundtripping for me, thanks.
>
> Thanks for checking; closing the bug report.

Thanks, too - it seems this fixed it for me, too.

Best,

-- 
Marcin Borkowski
http://mbork.pl