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Subject: bug#79955: emacs 30.2 test failure on ppc64el (-O3)
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Hello, I have a test failure on Ubuntu, when Emacs is built with O3 on ppc6=
4el
(this is the default, I guess also Debian has the same error when the O3 is=
 used)

Test lcms-cri-cam02-ucs backtrace:
=C2=A0=C2=A0signal(ert-test-failed (((should (eql 0.0 (lcms-cam02-ucs '(0.5=
 0.5=20
=C2=A0=C2=A0ert-fail(((should (eql 0.0 (lcms-cam02-ucs '(0.5 0.5 0.5) '(0.5=
 0.5=20
=C2=A0=C2=A0#f(compiled-function () #<bytecode 0x90cea133b5e614>)()
=C2=A0=C2=A0#f(compiled-function () #<bytecode 0xe4f31d36a0df0a1>)()
=C2=A0=C2=A0handler-bind-1(#f(compiled-function () #<bytecode 0xe4f31d36a0d=
f0a1>
=C2=A0=C2=A0ert--run-test-internal(#s(ert--test-execution-info :test #s(ert=
-test
=C2=A0=C2=A0ert-run-test(#s(ert-test :name lcms-cri-cam02-ucs :documentatio=
n "Te
=C2=A0=C2=A0ert-run-or-rerun-test(#s(ert--stats :selector (not (or ... ...)=
) :te
=C2=A0=C2=A0ert-run-tests((not (or (tag :expensive-test) (tag :unstable))) =
#f(co
=C2=A0=C2=A0ert-run-tests-batch((not (or (tag :expensive-test) (tag :unstab=
le)))
=C2=A0=C2=A0ert-run-tests-batch-and-exit((not (or (tag :expensive-test) (ta=
g :un
=C2=A0=C2=A0eval((ert-run-tests-batch-and-exit '(not (or (tag :expensive-te=
st) (
=C2=A0=C2=A0command-line-1(("-L" ":/<<PKGBUILDDIR>>/debian/build
=C2=A0=C2=A0command-line()
=C2=A0=C2=A0normal-top-level()
Test lcms-cri-cam02-ucs condition:
=C2=A0=C2=A0=C2=A0=C2=A0(ert-test-failed
=C2=A0=C2=A0=C2=A0=C2=A0 ((should (eql 0.0 (lcms-cam02-ucs ... ...))) :form
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0(eql 0.0 3.4662020221023775e-16) :value=
 nil))
=C2=A0=C2=A0 FAILED=C2=A0=C2=A02/6=C2=A0=C2=A0lcms-cri-cam02-ucs (0.000106 =
sec) at ../../build-src/test/src/lcms-tests.el:66

This is happening since quite some time (at least 2018), probably since whe=
n Ubuntu defaulted to O3 for the architecture.

Full log available here:

https://launchpadlibrarian.net/833010987/buildlog_ubuntu-resolute-ppc64el.e=
macs_1%3A30.2+1-2_BUILDING.txt.gz

First failure from Year 2018 is here:
https://launchpadlibrarian.net/405809312/buildlog_ubuntu-disco-ppc64el.emac=
s_1%3A26.1+1-3_BUILDING.txt.gz

Thanks for helping me out

Gianfranco

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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Gianfranco Costamagna <locutusofborg@HIDDEN>
Subject: bug#79955: Acknowledgement (emacs 30.2 test failure on ppc64el (-O3))
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Date: Sat, 06 Dec 2025 16:10:02 +0000

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Message sent to bug-gnu-emacs@HIDDEN:

Subject: bug#79955: emacs 30.2 test failure on ppc64el (-O3)
Resent-From: Eli Zaretskii <eliz@HIDDEN>
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Date: Sat, 06 Dec 2025 18:43:00 +0200
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> Date: Sat, 6 Dec 2025 14:09:45 +0000 (UTC)
> From: Gianfranco Costamagna <locutusofborg@HIDDEN>
> 
> Hello, I have a test failure on Ubuntu, when Emacs is built with O3 on ppc64el
> (this is the default, I guess also Debian has the same error when the O3 is used)
> 
> Test lcms-cri-cam02-ucs backtrace:
>   signal(ert-test-failed (((should (eql 0.0 (lcms-cam02-ucs '(0.5 0.5 
>   ert-fail(((should (eql 0.0 (lcms-cam02-ucs '(0.5 0.5 0.5) '(0.5 0.5 
>   #f(compiled-function () #<bytecode 0x90cea133b5e614>)()
>   #f(compiled-function () #<bytecode 0xe4f31d36a0df0a1>)()
>   handler-bind-1(#f(compiled-function () #<bytecode 0xe4f31d36a0df0a1>
>   ert--run-test-internal(#s(ert--test-execution-info :test #s(ert-test
>   ert-run-test(#s(ert-test :name lcms-cri-cam02-ucs :documentation "Te
>   ert-run-or-rerun-test(#s(ert--stats :selector (not (or ... ...)) :te
>   ert-run-tests((not (or (tag :expensive-test) (tag :unstable))) #f(co
>   ert-run-tests-batch((not (or (tag :expensive-test) (tag :unstable)))
>   ert-run-tests-batch-and-exit((not (or (tag :expensive-test) (tag :un
>   eval((ert-run-tests-batch-and-exit '(not (or (tag :expensive-test) (
>   command-line-1(("-L" ":/<<PKGBUILDDIR>>/debian/build
>   command-line()
>   normal-top-level()
> Test lcms-cri-cam02-ucs condition:
>     (ert-test-failed
>      ((should (eql 0.0 (lcms-cam02-ucs ... ...))) :form
>       (eql 0.0 3.4662020221023775e-16) :value nil))
>    FAILED  2/6  lcms-cri-cam02-ucs (0.000106 sec) at ../../build-src/test/src/lcms-tests.el:66
> 
> This is happening since quite some time (at least 2018), probably since when Ubuntu defaulted to O3 for the architecture.

Are you sure this is a problem with Emacs and not with the LCMS
library?  AFAICT, the test in question calls functions that just call
LCMS APIs, and other than that perform only trivial arithmetics and/or
call libc functions.

Btw, building Emacs with -O3 is a bad idea, and I seriously consider
the possibility of declaring such builds unsupported, certainly given
the high probability of bugs in the compiler when using -O3.  Maybe
you should communicate that to the Ubuntu package maintainers.

Message sent to bug-gnu-emacs@HIDDEN:

Subject: bug#79955: emacs 30.2 test failure on ppc64el (-O3)
Resent-From: Gianfranco Costamagna <locutusofborg@HIDDEN>
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To: Eli Zaretskii <eliz@HIDDEN>
Cc: "79955 <at> debbugs.gnu.org" <79955 <at> debbugs.gnu.org>
Reply-To: Gianfranco Costamagna <locutusofborg@HIDDEN>
Date: Sun, 7 Dec 2025 07:45:52 +0000 (UTC)
From: Gianfranco Costamagna <locutusofborg@HIDDEN>
Message-ID: <1407501545.302415.1765093552086@HIDDEN>
In-Reply-To: <864iq3woh7.fsf@HIDDEN>
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I think if O3 is a bad idea, that maybe we can add some configure check and=
 error out in that case?
This would be beneficial also for other distro...

G.






Il sabato 6 dicembre 2025 alle ore 17:43:10 CET, Eli Zaretskii <eliz@HIDDEN=
g> ha scritto:=20





> Date: Sat, 6 Dec 2025 14:09:45 +0000 (UTC)

> From: Gianfranco Costamagna <locutusofborg@HIDDEN>
>=20
> Hello, I have a test failure on Ubuntu, when Emacs is built with O3 on pp=
c64el
> (this is the default, I guess also Debian has the same error when the O3 =
is used)
>=20
> Test lcms-cri-cam02-ucs backtrace:
> =C2=A0=C2=A0signal(ert-test-failed (((should (eql 0.0 (lcms-cam02-ucs '(0=
.5 0.5=20
> =C2=A0=C2=A0ert-fail(((should (eql 0.0 (lcms-cam02-ucs '(0.5 0.5 0.5) '(0=
.5 0.5=20
> =C2=A0=C2=A0#f(compiled-function () #<bytecode 0x90cea133b5e614>)()
> =C2=A0=C2=A0#f(compiled-function () #<bytecode 0xe4f31d36a0df0a1>)()
> =C2=A0=C2=A0handler-bind-1(#f(compiled-function () #<bytecode 0xe4f31d36a=
0df0a1>
> =C2=A0=C2=A0ert--run-test-internal(#s(ert--test-execution-info :test #s(e=
rt-test
> =C2=A0=C2=A0ert-run-test(#s(ert-test :name lcms-cri-cam02-ucs :documentat=
ion "Te
> =C2=A0=C2=A0ert-run-or-rerun-test(#s(ert--stats :selector (not (or ... ..=
.)) :te
> =C2=A0=C2=A0ert-run-tests((not (or (tag :expensive-test) (tag :unstable))=
) #f(co
> =C2=A0=C2=A0ert-run-tests-batch((not (or (tag :expensive-test) (tag :unst=
able)))
> =C2=A0=C2=A0ert-run-tests-batch-and-exit((not (or (tag :expensive-test) (=
tag :un
> =C2=A0=C2=A0eval((ert-run-tests-batch-and-exit '(not (or (tag :expensive-=
test) (
> =C2=A0=C2=A0command-line-1(("-L" ":/<<PKGBUILDDIR>>/debian/build
> =C2=A0=C2=A0command-line()
> =C2=A0=C2=A0normal-top-level()
> Test lcms-cri-cam02-ucs condition:
> =C2=A0=C2=A0=C2=A0=C2=A0(ert-test-failed
> =C2=A0=C2=A0=C2=A0=C2=A0 ((should (eql 0.0 (lcms-cam02-ucs ... ...))) :fo=
rm
> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0(eql 0.0 3.4662020221023775e-16) :val=
ue nil))
> =C2=A0=C2=A0 FAILED=C2=A0=C2=A02/6=C2=A0=C2=A0lcms-cri-cam02-ucs (0.00010=
6 sec) at ../../build-src/test/src/lcms-tests.el:66
>=20
> This is happening since quite some time (at least 2018), probably since w=
hen Ubuntu defaulted to O3 for the architecture.


Are you sure this is a problem with Emacs and not with the LCMS
library?=C2=A0 AFAICT, the test in question calls functions that just call
LCMS APIs, and other than that perform only trivial arithmetics and/or
call libc functions.

Btw, building Emacs with -O3 is a bad idea, and I seriously consider
the possibility of declaring such builds unsupported, certainly given
the high probability of bugs in the compiler when using -O3.=C2=A0 Maybe
you should communicate that to the Ubuntu package maintainers.

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> Date: Sun, 7 Dec 2025 07:45:52 +0000 (UTC)
> From: Gianfranco Costamagna <locutusofborg@HIDDEN>
> Cc: "79955 <at> debbugs.gnu.org" <79955 <at> debbugs.gnu.org>
> 
> I think if O3 is a bad idea, that maybe we can add some configure check and error out in that case?
> This would be beneficial also for other distro...

Maybe.

What about my question regarding the problem being in the library, not
in Emacs?  I suggest to communicate this to the mnaintainers of the
Ubuntu package for the LCMS library, and ask them to see if it's the
library code that needs to be fixed.

Thanks.

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Date: Sun, 7 Dec 2025 23:37:49 +0000 (UTC)
From: Gianfranco Costamagna <locutusofborg@HIDDEN>
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Hello, I did try to build the library with -O2, thanks for the suggestion (=
I'm really clueless, I thought it was an internal library, not an external =
one!)

This is one built with O3 library

https://launchpad.net/~costamagnagianfranco/+archive/ubuntu/costamagnagianf=
ranco-ppa/+build/31566931/+files/buildlog_ubuntu-resolute-ppc64el.emacs_1%3=
A30.2+1-2ubuntu4_BUILDING.txt.gz

This one uses a library built without FORTIFY_FLAGS
https://launchpadlibrarian.net/836091682/buildlog_ubuntu-resolute-ppc64el.e=
macs_1%3A30.2+1-2ubuntu5_BUILDING.txt.gz

This one uses a library built with -O2

https://launchpadlibrarian.net/836106691/buildlog_ubuntu-resolute-ppc64el.e=
macs_1%3A30.2+1-2ubuntu6_BUILDING.txt.gz


G.






Il domenica 7 dicembre 2025 alle ore 10:37:58 CET, Eli Zaretskii <eliz@gnu.=
org> ha scritto:=20





> Date: Sun, 7 Dec 2025 07:45:52 +0000 (UTC)

> From: Gianfranco Costamagna <locutusofborg@HIDDEN>
> Cc: "79955 <at> debbugs.gnu.org" <79955 <at> debbugs.gnu.org>
>=20
> I think if O3 is a bad idea, that maybe we can add some configure check a=
nd error out in that case?
> This would be beneficial also for other distro...

Maybe.


What about my question regarding the problem being in the library, not
in Emacs?=C2=A0 I suggest to communicate this to the mnaintainers of the
Ubuntu package for the LCMS library, and ask them to see if it's the
library code that needs to be fixed.

Thanks.

Message sent to bug-gnu-emacs@HIDDEN:

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> Date: Sun, 7 Dec 2025 23:37:49 +0000 (UTC)
> From: Gianfranco Costamagna <locutusofborg@HIDDEN>
> Cc: "79955 <at> debbugs.gnu.org" <79955 <at> debbugs.gnu.org>
> 
> Hello, I did try to build the library with -O2, thanks for the suggestion (I'm really clueless, I thought it was an internal library, not an external one!)
> 
> This is one built with O3 library
> 
> https://launchpad.net/~costamagnagianfranco/+archive/ubuntu/costamagnagianfranco-ppa/+build/31566931/+files/buildlog_ubuntu-resolute-ppc64el.emacs_1%3A30.2+1-2ubuntu4_BUILDING.txt.gz
> 
> This one uses a library built without FORTIFY_FLAGS
> https://launchpadlibrarian.net/836091682/buildlog_ubuntu-resolute-ppc64el.emacs_1%3A30.2+1-2ubuntu5_BUILDING.txt.gz
> 
> This one uses a library built with -O2
> 
> https://launchpadlibrarian.net/836106691/buildlog_ubuntu-resolute-ppc64el.emacs_1%3A30.2+1-2ubuntu6_BUILDING.txt.gz

And the problem persists with both builds?

Last modified: Mon, 8 Dec 2025 12:30:03 UTC

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