Re: Dynamically-generated C stored in SVN is breaking our distribution because life is awful (was Re: F28 System Wide Change: GCC8)

[Fabio Valentini]

On Feb 20, 2018 08:54, "Adam Williamson" <adamwill(a)fedoraproject.org&gt;
wrote:

On Mon, 2018-02-19 at 22:57 -0800, Adam Williamson wrote:
>  On Tue, 2018-01-09 at 21:51 +0100, Jakub Jelinek wrote:
>  > On Tue, Jan 09, 2018 at 07:50:10PM +0000, Stephen Gallagher wrote:
>  > > > Well, true, but then just like every year, we'll wind up doing a
lot of
>  > > > the spadework of fixing things to build with the new
> GCC. And 
probably
>  > > > at first some critical things will fail to build and
> that'll mess up
>  > > > the stability of the distro for a couple of weeks. I guess if
everyone
>  > > > else is still loving that grind, hey.
>  > > >
>  > >
>  > >
>  > > This is the cost of being "First". Fedora has long enjoyed a tight
coupling
>  > > with the GCC upstream. It's a symbiosis: they use our
> mass-rebuild to 
help
>  > > identify any issues before GCC goes stable and in turn
> Fedora gets to 
have
>  > > the newest compiler features before anyone else.
>  >
>  > To be fair, Ubuntu (or Debian or both, dunno) has already performed 
test mass
>  > rebuilds with GCC 8 prerelease some time ago and OpenSUSE
> usually 
performs them
>  > roughly at the same time as we do.  We are likely the first one
> or one 
of
>  > the first ones to deploy it as a stable compiler in the distro
> and it is
>  > mutually beneficial both for the distro and for GCC.
>
>  Just for the record, it is now 11pm the day before we are supposed to
>  branch Fedora 28, and I have spent the whole evening fixing
>  OpenColorIO's Python bindings to build with GCC 8:
>
>  https://github.com/imageworks/OpenColorIO/pull/518
>
>  only to find that it fails to build on i686 because since pdftex got
>  rebuilt with GCC 8 (OK, haven't confirmed that yet, but it's the most
>  obvious suspect), it's segfaulting:
>
>  https://koji.fedoraproject.org/koji/taskinfo?taskID=25176488
>
>  Also noted by QuLogic trying to build R-htmltools:
>
>  https://koji.fedoraproject.org/koji/taskinfo?taskID=25173683
>
>  So now I am running the build in an i686 mock so I can shell into the
>  mock and hopefully get a traceback of the pdftex crash and try to do
>  *something* about fixing it. 
So, here lies a hilarious tale of dynamic generation of entirely
undocumented C code using single-character variable names by a
ridiculously arcane build system tracked in Subversion:


Wow, that's exceptionally awful.
You're a hero for tracking down and fixing those things. Really. Thank you.

Fabio

https://bugzilla.redhat.com/show_bug.cgi?id=1546964

Excuse me while I go break some stuff.
--
Adam Williamson
Fedora QA Community Monkey
IRC: adamw | Twitter: AdamW_Fedora | XMPP: adamw AT happyassassin . net
http://www.happyassassin.net
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