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What’s up with Firefox 57 and Clang?
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unheatedgarage
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PostPosted: Wed Nov 15, 2017 6:41 am    Post subject: What’s up with Firefox 57 and Clang? Reply with quote

It wasn't’ too long ago that FF had a rust dependency, and it wasn’t a big deal, but with the latest release, I was taken aback with all its new requirements.

I’ve been kinda-sorta following Chrome/Chromium development, and it seems they’ve moved over to Clang too.

Are we witnessing the slow demise of GCC? Is this going to be like the creeping advance of Systemd/Pulseaudo?

Remember how the Japanese auto industry just sort-of happened on Detroit? It was only with their grudging adaptation of new technologies that they stayed competitive, meanwhile their competitors stayed decades ahead for...decades.

Or maybe this isn’t an adversarial situation—perhaps this isn’t a zero-sum game.

But I sure enjoy the apocalyptic scenario this language paints! So: is this the fetid stench of the advancing hordes I smell? Do I need to sharpen my scythe!?!
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Juippisi
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PostPosted: Wed Nov 15, 2017 7:05 am    Post subject: Reply with quote

I was wondering the same. Found the following page,
https://developer.mozilla.org/en-US/docs/Using_CXX_in_Mozilla_code

seems like Firefox's codebase is better supported by Clang. They seem to use Clang to build Firefox on Arch and Fedora too at least. Might be Mozilla's decision that Gentoo cant do much about, other than obey...

I'd be willing to switch to Clang 100 % if it could build the current Linux kernel.
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unheatedgarage
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PostPosted: Wed Nov 15, 2017 8:38 am    Post subject: Reply with quote

Thank you for the link, Juippisi.

I’m not against clang either. I do, however, find it interesting that after having purposefully installed it on my laptop for Chromecast/Chromium, now all-the-sudden my sturdy desktop (having never touched clang) sees it as a hard dependency for Firefox.

It’s as though there’s this mingling of everything.

I remember watching Johnny Mnemonic oh so many years ago thinking: “How cool would that be to have everything linked up to everything else? Hook me up!”

Alas, the now is just me scratching my chin at the latest Firefox update, wondering if clang is getting too tentacle-y. This is not the entertaining future I was promised.

Where is my post-apocalyptic wasteland? Where is my heroically intelligent dolphin? Where are the jacked-up street preachers? Where's my crazy lazer whip?

So many disappointments. Thanks for the letdown, Hollywood!
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Perfect Gentleman
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PostPosted: Thu Nov 16, 2017 12:06 pm    Post subject: Reply with quote

Juippisi, have you already build Firefox with Clang?
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thican
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PostPosted: Thu Nov 16, 2017 12:10 pm    Post subject: Reply with quote

I think we might be mislead, see bug 637576.
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Juippisi
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PostPosted: Fri Nov 17, 2017 5:13 am    Post subject: Reply with quote

Perfect Gentleman wrote:
Juippisi, have you already build Firefox with Clang?


Nope, apparently not.

Code:

# cat /var/db/pkg/www-client/firefox-57.0/CC
x86_64-pc-linux-gnu-gcc


Might try it later.
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unheatedgarage
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PostPosted: Fri Nov 17, 2017 5:29 am    Post subject: Reply with quote

I might try migrating my desktop over to Clang (as best can be done). It’s either that or play around with distcc. Or, you know, write this term paper that’s due tomorrow. But who wants to do that?

Clang it is—will report.

Also, thanks for the bug link, thican. Very enlightening!
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unheatedgarage
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PostPosted: Fri Nov 17, 2017 7:24 am    Post subject: Reply with quote

Perfect Gentleman,

Just finished compiling FF 57 with the ~amd64 version of Clang on the stable branch of Gentoo:

Code:
cat /var/db/pkg/www-client/firefox-57.0/CC
clang


Code:
sudo qlop -gHltv firefox

firefox-57.0: Tue Nov 14 22:10:01 2017: 49 minutes, 13 seconds <-- with GCC 6.4.0
firefox-57.0: Thu Nov 16 23:54:23 2017: 1 hour, 0 seconds <-- with clang 5.0.0
 


That's not surprising--it took my poor little laptop quite a bit longer to compile Chromium with clang than it did with gcc too (about 6 hours longer).

As far as performance goes, it's too early to tell, but frankly, these seat-of-the-pants kind of things are more placebo-ish than anything else. Maybe I'll play around with the gold liker LTO thing-a-ma-bob later on.

But now that I've set Clang system wide, I'm now wondering if I should do an --emptytree, or run with scissors and just let things roll on...

Danger, Will Robinson
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Perfect Gentleman
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PostPosted: Fri Nov 17, 2017 7:51 am    Post subject: Reply with quote

unheatedgarage, what patches, switches, flags do you use with Clang?
As I understand there is issue with linking Hunspell
Code:
firefox: symbol lookup error: /usr/lib64/firefox/libxul.so: undefined symbol: _ZNK8Hunspell17get_dict_encodingEv
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unheatedgarage
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PostPosted: Fri Nov 17, 2017 8:41 am    Post subject: Reply with quote

Perfect Gentleman,

:oops: I'm just using the plain-jane desktop profile with this in my accept_keywords:

Code:
# 5 Nov 2017 Keep these testing--some temporarily--check back here occasionally
=games-simulation/flightgear-2017.2.1
www-client/firefox ~amd64
sys-devel/* ~amd64 # keep GCC and related testing
x11-themes/* ~amd64
xfce-base/* ~amd64
xfce-extra/* ~amd64
app-portage/* ~amd64 # all other things portage
sys-apps/portage ~amd64 # just for portage--don't worry about rest of sys-apps/*
media-libs/mesa ~amd64 # temp--masked newer versions--just to get firefox 57
media-sound/audacity ~amd64
sci-misc/boinc ~amd64


I’d be happy to show you my package.use, but good lord that’s even more of a mess, and probably not helpful?

Make.conf, perhaps?

I just followed the Clang tutorial and specifically here: https://wiki.gentoo.org/wiki/Clang#Global_configuration_via_make.conf

I did not mess with link-time optimizations—just the bare bones setup.

Happy to provide any info you need!
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Perfect Gentleman
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PostPosted: Fri Nov 17, 2017 9:35 am    Post subject: Reply with quote

Oh.
You use Clang globally, I'm not. That could be a reason of such Firefox behavior.
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