GNU bug report logs - #32086
26.1.50; Floating point exceptions during byte-compilation on alpha-unknown-linux-gnu

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Ulrich Mueller <ulm <at> gentoo.org>
To: bug-gnu-emacs <at> gnu.org
Cc: Tobias Klausmann <klausman <at> gentoo.org>
Subject: 26.1.50; Floating point exceptions during byte-compilation on
 alpha-unknown-linux-gnu
Date: Sat, 7 Jul 2018 20:26:55 +0200

Another regression on alpha-unknown-linux-gnu, byte-compilation of the
following four lisp files fails with floating point exceptions:

make[2]: Entering directory '/space/homedirs/ulm/emacs/lisp'
EMACSLOADPATH= '../src/emacs' -batch --no-site-file --no-site-lisp --eval '(setq load-prefer-newer t)'  -f batch-byte-compile calculator.el
EMACSLOADPATH= '../src/emacs' -batch --no-site-file --no-site-lisp --eval '(setq load-prefer-newer t)'  -f batch-byte-compile calc/calc-math.el
EMACSLOADPATH= '../src/emacs' -batch --no-site-file --no-site-lisp --eval '(setq load-prefer-newer t)'  -f batch-byte-compile nxml/rng-xsd.el
EMACSLOADPATH= '../src/emacs' -batch --no-site-file --no-site-lisp --eval '(setq load-prefer-newer t)'  -f batch-byte-compile org/org-table.el
make[2]: *** [Makefile:297: calc/calc-math.elc] Floating point exception
make[2]: *** Waiting for unfinished jobs....
make[2]: *** [Makefile:297: nxml/rng-xsd.elc] Floating point exception
make[2]: *** [Makefile:297: calculator.elc] Floating point exception
make[2]: *** [Makefile:297: org/org-table.elc] Floating point exception
make[2]: Leaving directory '/space/homedirs/ulm/emacs/lisp'
make[1]: *** [Makefile:320: compile-main] Error 2
make[1]: Leaving directory '/space/homedirs/ulm/emacs/lisp'
make: *** [Makefile:405: lisp] Error 2

The exceptions are triggered in functions string_to_number in lread.c
and float_to_string in print.c when values of infinity or NaN are
being passed.

The same lisp files (from the emacs-26 branch) can be compiled with
Emacs 25.3, though.

(On first glance, it doesn't look like the code in lread.c and print.c
has changed, so the problem must be somewhere else. Signal handling?)


In GNU Emacs 26.1.50 (build 1, alpha-unknown-linux-gnu)
 of 2018-07-07 built on monolith
Repository revision: b73cde5e2815c531df7f5fd13e214a7d92f78239

Configured using:
 'configure --prefix=/usr --build=alpha-unknown-linux-gnu
 --host=alpha-unknown-linux-gnu --mandir=/usr/share/man
 --infodir=/usr/share/info --datadir=/usr/share --sysconfdir=/etc
 --localstatedir=/var/lib --disable-silent-rules
 --docdir=/usr/share/doc/emacs-26.1
 --htmldir=/usr/share/doc/emacs-26.1/html --libdir=/usr/lib
 --program-suffix=-emacs-26 --infodir=/usr/share/info/emacs-26
 --localstatedir=/var
 --enable-locallisppath=/etc/emacs:/usr/share/emacs/site-lisp
 --without-compress-install --without-hesiod --without-pop
 --with-file-notification=inotify --enable-acl --without-dbus
 --without-modules --without-gameuser --without-gpm --without-kerberos
 --without-kerberos5 --without-lcms2 --without-xml2 --without-mailutils
 --without-selinux --with-gnutls --without-libsystemd --with-threads
 --without-wide-int --with-zlib --with-sound=no --without-x
 --without-ns'

Configured features:
NOTIFY ACL GNUTLS ZLIB THREADS

Message #8 received at 32086 <at> debbugs.gnu.org (full text, mbox):

From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Ulrich Mueller <ulm <at> gentoo.org>
Cc: 32086 <at> debbugs.gnu.org
Subject: Re: 26.1.50; Floating point exceptions during byte-compilation on
 alpha-unknown-linux-gnu
Date: Sat, 7 Jul 2018 14:27:39 -0700

[Message part 1 (text/plain, inline)]

Thanks for reporting the bug. Please try the attached patch, which I'd like to 
install into the emacs-26 branch if it fixes your problem.

[0001-Fix-floating-point-exceptions-on-Alpha-Bug-32086.patch (text/x-patch, attachment)]

Message #13 received at 32086 <at> debbugs.gnu.org (full text, mbox):

From: Ulrich Mueller <ulm <at> gentoo.org>
To: Paul Eggert <eggert <at> cs.ucla.edu>
Cc: 32086 <at> debbugs.gnu.org
Subject: Re: 26.1.50; Floating point exceptions during byte-compilation on
 alpha-unknown-linux-gnu
Date: Sun, 8 Jul 2018 00:47:41 +0200

>>>>> On Sat, 7 Jul 2018, Paul Eggert wrote:

> Thanks for reporting the bug. Please try the attached patch, which
> I'd like to install into the emacs-26 branch if it fixes your
> problem.

This fixes it. Thanks again.

(And please ignore my earlier remark that the lisp files in question
can be byte-compiled with Emacs 25.3. It turns out that the Emacs I
used for testing had been built with -mieee in CFLAGS.)

Message #18 received at 32086-done <at> debbugs.gnu.org (full text, mbox):

From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Ulrich Mueller <ulm <at> gentoo.org>
Cc: 32086-done <at> debbugs.gnu.org
Subject: Re: 26.1.50; Floating point exceptions during byte-compilation on
 alpha-unknown-linux-gnu
Date: Sun, 8 Jul 2018 09:27:17 -0700

Ulrich Mueller wrote:
> This fixes it. Thanks again.
> 
> (And please ignore my earlier remark that the lisp files in question
> can be byte-compiled with Emacs 25.3. It turns out that the Emacs I
> used for testing had been built with -mieee in CFLAGS.)

Thanks for checking. Since this is not a regression in Emacs 26, I installed the 
patch into the Emacs master branch, and am marking the bug as done.

Message #21 received at 32086 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Paul Eggert <eggert <at> cs.ucla.edu>
Cc: 32086 <at> debbugs.gnu.org, ulm <at> gentoo.org
Subject: Re: bug#32086: 26.1.50;
 Floating point exceptions during byte-compilation on
 alpha-unknown-linux-gnu
Date: Sun, 08 Jul 2018 19:51:01 +0300

> From: Paul Eggert <eggert <at> cs.ucla.edu>
> Date: Sun, 8 Jul 2018 09:27:17 -0700
> Cc: 32086-done <at> debbugs.gnu.org
> 
> Ulrich Mueller wrote:
> > This fixes it. Thanks again.
> > 
> > (And please ignore my earlier remark that the lisp files in question
> > can be byte-compiled with Emacs 25.3. It turns out that the Emacs I
> > used for testing had been built with -mieee in CFLAGS.)
> 
> Thanks for checking. Since this is not a regression in Emacs 26, I installed the 
> patch into the Emacs master branch, and am marking the bug as done.

Thanks.  But doesn't this mean Emacs 26 will not build on that
platform?  Maybe we should backport your change to emacs-26 after all.

Message #24 received at 32086 <at> debbugs.gnu.org (full text, mbox):

From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 32086 <at> debbugs.gnu.org, ulm <at> gentoo.org
Subject: Re: bug#32086: 26.1.50; Floating point exceptions during
 byte-compilation on alpha-unknown-linux-gnu
Date: Sun, 8 Jul 2018 10:11:32 -0700

Eli Zaretskii wrote:
> But doesn't this mean Emacs 26 will not build on that
> platform?  Maybe we should backport your change to emacs-26 after all.

That'd be fine with me, and if you prefer that I'll backport the change. Emacs 
26 does not build properly on that platform unless the builder uses something 
like "./configure CFLAGS=-mieee" when building Emacs.

Message #27 received at 32086 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Paul Eggert <eggert <at> cs.ucla.edu>
Cc: 32086 <at> debbugs.gnu.org, ulm <at> gentoo.org
Subject: Re: bug#32086: 26.1.50; Floating point exceptions during
 byte-compilation on alpha-unknown-linux-gnu
Date: Sun, 08 Jul 2018 20:38:42 +0300

> Cc: 32086 <at> debbugs.gnu.org, ulm <at> gentoo.org
> From: Paul Eggert <eggert <at> cs.ucla.edu>
> Date: Sun, 8 Jul 2018 10:11:32 -0700
> 
> Eli Zaretskii wrote:
> > But doesn't this mean Emacs 26 will not build on that
> > platform?  Maybe we should backport your change to emacs-26 after all.
> 
> That'd be fine with me, and if you prefer that I'll backport the change. Emacs 
> 26 does not build properly on that platform unless the builder uses something 
> like "./configure CFLAGS=-mieee" when building Emacs.

Unless it's an obscure platform, I think we'd better support it.
Emacs 27 won't be out for a year at least, probably longer, and that's
too long for a platform we want to support, I think.

Message #30 received at 32086 <at> debbugs.gnu.org (full text, mbox):

From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 32086 <at> debbugs.gnu.org, ulm <at> gentoo.org
Subject: Re: bug#32086: 26.1.50; Floating point exceptions during
 byte-compilation on alpha-unknown-linux-gnu
Date: Sun, 8 Jul 2018 11:42:09 -0700

Eli Zaretskii wrote:
> Unless it's an obscure platform, I think we'd better support it.

OK, I backported it to emacs-26.

Message #33 received at 32086 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Paul Eggert <eggert <at> cs.ucla.edu>
Cc: 32086 <at> debbugs.gnu.org, ulm <at> gentoo.org
Subject: Re: bug#32086: 26.1.50; Floating point exceptions during
 byte-compilation on alpha-unknown-linux-gnu
Date: Sun, 08 Jul 2018 21:53:43 +0300

> Cc: 32086 <at> debbugs.gnu.org, ulm <at> gentoo.org
> From: Paul Eggert <eggert <at> cs.ucla.edu>
> Date: Sun, 8 Jul 2018 11:42:09 -0700
> 
> Eli Zaretskii wrote:
> > Unless it's an obscure platform, I think we'd better support it.
> 
> OK, I backported it to emacs-26.

Thanks.

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