Re: F37 Change: MinGW UCRT target (Self-Contained Change proposal)

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On Tue, Feb 08, 2022 at 12:54:32PM +0100, Zbigniew Jędrzejewski-Szmek wrote:
> On Tue, Feb 08, 2022 at 02:13:34PM +0400, Marc-André Lureau wrote:
> > So far, what I built is a custom python/jinja script to generate the spec,
> > here is the code and example with mingw-zlib:
> > https://gitlab.com/-/snippets/2243878
> > 
> > Ideally, we would use built-in RPM template facilities, but that may take a
> > while: https://github.com/rpm-software-management/rpm/issues/1472.
> Yes, I think you need to assume that this will not happen soon.
> (If ever. I think that there are significant doubts whether this type
> of templating is desirable.)
> 
> > It will be hard to automate the translation from existing spec to a
> > template form, but I can eventually look at it.
> > 
> > Adding ucrt64 packages is still optional, and can be done manually anyway.
> > Templating is optional too, obviously.
> 
> Hmm, but wouldn't the goal be to provide ucrt64 everywhere where there are
> existing mingw packages? If users are to transition to ucrt64, they would need
> to be able to assume that they can do that without regressions.

Yes, if we're going to add ucrt64 support then I think the expectations
a would be for it to be added in all packages, in a reasonably timely
manner. Doing everything in 1 release is likely unrealistic, but at the
same time it isn't nice to let it drag out over an indefinite number
of releases.

As a historical reference, see when we added mingw64 support to the
existing mingw32 packages:

  https://fedoraproject.org/wiki/Features/Mingw-w64_cross_compiler

That was a bit more complex as it was actuallly swapping out the
toolchain, and rebuilding all existing mingw32 packages with the
new mingww64 toolchain, as well as then adding mingw64 sub-RPMs

The actual Fedora targetting Fedora 17 was simply to get the toolchain
and basic runtime bootstrapped and into Fedora 17.  The conversion of
existing packages to add -mingw64 sub-RPM was not gated on Fedora 17,
it was an asynchronous task. Most packages were converted via an out
of tree testing repo ahead of the feature being propposed, to prove
the viability of the work, so just needed to have pre-existing work
merged.

IIRC, Fedora 17 introduced mingw64 toolchain and converted alot
of packages, and pretty much everything remaining was finished
converting in F18 cycle.


I think a feature page proposal is reasonable in suggesting the
initial feature target is bootstrapping the base ucrt64 support
and converting some common packages.

I'm not quite so convinced by punting conversion of everything
else to "other developers", with no expectation of when this
work is to be completed. I fear this means alot of conversion
just won't get done in a timely manner.

Regards,
Daniel
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