On Wed, Aug 24, 2016 at 5:28 PM, Kevin Fenzi <kevin@xxxxxxxxx> wrote:
On Wed, 24 Aug 2016 16:43:31 -0600
Dave Johansen <davejohansen@xxxxxxxxx> wrote:
> On Wed, Aug 24, 2016 at 4:22 PM, Kevin Fenzi <kevin@xxxxxxxxx> wrote:
>
> > On Tue, 23 Aug 2016 14:21:24 +0100
> > Karanbir Singh <mail-lists@xxxxxxxxx> wrote:
> >
> > > On 22/08/16 18:30, Jason L Tibbitts III wrote:
> > > >>>>>> "DJ" == Dave Johansen <davejohansen@xxxxxxxxx> writes:
> > > >
> > > > DJ> devtoolset is designed to do all of this and is already
> > > > DJ> done, so it seems that the only advantage to putting it in
> > > > DJ> EPEL itself would be to reduce the number of repos during
> > > > DJ> build time.
> > > >
> > > > So is devtoolset something I get access to as a CentOS user?
> > > > How do I build these packages myself (i.e. in mock)?
> > >
> > > you should be able to 'yum install centos-release-scl' on a CentOS
> > > Linux machine and get access to all the SCLs
> >
> > Yeah, but if we enable that for EPEL builds, we are going to get all
> > SCLs right? So, people could start depending on them at runtime
> > instead of just install time.
> >
> > I'm not opposed to devtoolset, but I don't think we want to allow
> > runtime scls without actual scl guidelines.
> >
>
> I seem to remember that Fedora didn't allow SCLs because there was
> some compatibility problem or something of the sort. Do you know the
> details or what the current state is?
It's not a compatibility problem. It's lack of guidelines.
> Also, RedHat has been pushing devtoolset pretty hard. The response to
> a few bugzillas has even been "use devtoolset because the issue is
> fixed there and we're not going to fix the system gcc/libc/etc". So
> it seems like allowing SCLs in Fedora/EPEL makes sense and fits with
> the direction of RHEL in general.
As I noted, I'd probibly be for devtoolset because the guidelines would
be pretty simple. Just do X Y and Z in your spec, build as normal and
users wouldn't see any run time dep on it.
It gets weird where other SCL's come in. Can your package require say
postgresql from SCL instead of the rhel one? If so, would our users all
be able to install that? What happens if two packages need different
SCL versions? Can SCL's depend on each other? Can you make a package
thats an SCL? we have no guidelines for that, and just saying "do
whatever you want" is likely to cause mass confusion and make everyone
miserable.
I agree that how to handle SCLs can get really mess really fast, but a lot of projects are jumping on the "modern C++" bandwagon and allows devtoolset is low risk, easy to do and enables a lot of packages to be built with EPEL that otherwise wouldn't be.
Basically, I think that figuring out how to handle SCLs is a long term issue that will take some serious work, but coming up with some simple policies that allow it to be used in EPEL is something that should be well within the realm of the possible.
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