On Fri, Jan 10, 2020 at 5:05 AM Florian Weimer <fwei...@redhat.com> wrote:
>
> * Neal Gompa:
>
> > On Fri, Jan 10, 2020 at 4:28 AM Florian Weimer <fwei...@redhat.com> wrote:
> >>
> >> We do not want to change the RPM architecture, so that users still can
> >> install third-party software.  This means that we need to change the
> >> dist tag to avoid confusion.
> >>
> >
> > Changing the RPM architecture does not necessarily mean that you
> > wouldn't remain compatible with baseline x86_64. For example,
> > OpenMandriva's build of the distribution optimized for first
> > generation AMD Ryzen systems uses the "znver1" RPM architecture, but
> > the "znver1" architecture is deliberately considered compatible with
> > x86_64, so packages that are "x86_64" are still installable. There are
> > numerous examples of this for 32-bit x86, and there's no reason we
> > couldn't do this for 64-bit x86.
>
> But the value of %_arch still changes, right?
>
> I believe this will break things, like this:
>
> | F     ?= $(shell test ! -e /etc/fedora-release && echo 0; test -e 
> /etc/fedora-release && rpm --eval %{fedora})
> | ARCH  ?= $(shell test ! -e /etc/fedora-release && uname -m; test -e 
> /etc/fedora-release && rpm --eval %{_arch})
> | MOCK_CFG      ?= $(shell test -e /etc/fedora-release && echo 
> fedora-$(F)-$(ARCH))
>

It will break _that_ specifically, yes. But it is not okay to make
this muddier than it already is. If we are changing the definition of
x86_64 in Fedora, that's one thing. But you are not proposing that.
Therefore, it needs a different architecture classification.

And as an aside, that particular code would still break even if you
were using just a weird DistTag change, because a separate build root
means a separate mock configuration.


-- 
真実はいつも一つ!/ Always, there's only one truth!
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