llvm dev - Jan 2020 - Flang landing in the monorepo - next Monday!

Hi All,

As discussed before Christmas, this is a reminder that we intend to 
merge flang on the 13th January (next Monday) before the llvm-10 branch. 
At the moment I'm proposing to do it at 10am GMT. I can be flexible on 
this point if it requires close coordination with anyone in another 
timezone, just let me know.

Previous discussion was in [llvm-dev] Flang landing in the monorepo 
<http://lists.llvm.org/pipermail/llvm-dev/2019-December/137661.html>.

The current plan of action is summarized at 
<https://github.com/flang-compiler/f18/issues/876>.

The result will look a lot like the recent MLIR merge from 24th Dec: 
<https://github.com/llvm/llvm-project/commits/0f0d0ed1c78>, commit 
0f0d0ed1c78 in the llvm-project monorepo.

Once it is done I'll mail the list. If you want to coordinate with me, 
please get in touch.

Regards,

- Peter

Hey Peter - would you be able to link to/describe the history on this
process/decision. I can find one old thread where this was first proposed (
http://lists.llvm.org/pipermail/llvm-dev/2019-February/130497.html ) with
some general positive responses and a lot of questions.

I see there's a flang-dev list, though I'm not sure where code review is
happening (is there flang-commits or equivalent?) as there's not much
chatter on the mailing list that I can see.

& I'm a bit concerned about flang, already a project with no LLVM API
usage, it seems, and a community that doesn't currently look like it has
much overlap with the LLVM developer community (a very rough glance at
flang-dev participants, but I could be wrong - the LLVM community is large,
to be sure) - I'm concerned that this might create a not very well
integrated community, as we saw in the past with lldb, for instance.

- Dave

On Tue, Jan 7, 2020 at 6:04 AM Peter Waller via llvm-dev <
llvm-dev at lists.llvm.org> wrote:
> Hi All,
>
> As discussed before Christmas, this is a reminder that we intend to
> merge flang on the 13th January (next Monday) before the llvm-10 branch.
> At the moment I'm proposing to do it at 10am GMT. I can be flexible on
> this point if it requires close coordination with anyone in another
> timezone, just let me know.
>
> Previous discussion was in [llvm-dev] Flang landing in the monorepo
> <http://lists.llvm.org/pipermail/llvm-dev/2019-December/137661.html>.
>
> The current plan of action is summarized at
> <https://github.com/flang-compiler/f18/issues/876>.
>
> The result will look a lot like the recent MLIR merge from 24th Dec:
> <https://github.com/llvm/llvm-project/commits/0f0d0ed1c78>, commit
> 0f0d0ed1c78 in the llvm-project monorepo.
>
> Once it is done I'll mail the list. If you want to coordinate with me,
> please get in touch.
>
> Regards,
>
> - Peter
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>
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On 01/07, David Blaikie via llvm-dev wrote:
> Hey Peter - would you be able to link to/describe the history on this
> process/decision. I can find one old thread where this was first proposed (
> http://lists.llvm.org/pipermail/llvm-dev/2019-February/130497.html ) with
> some general positive responses and a lot of questions.
> 
> I see there's a flang-dev list, though I'm not sure where code
review is
> happening (is there flang-commits or equivalent?) as there's not much
> chatter on the mailing list that I can see.
There is a flang-commits. We have everything set up to use Phabricator
as MLIR did.
> & I'm a bit concerned about flang, already a project with no LLVM
API
> usage, it seems, and a community that doesn't currently look like it
has
> much overlap with the LLVM developer community (a very rough glance at
> flang-dev participants, but I could be wrong - the LLVM community is large,
> to be sure) - I'm concerned that this might create a not very well
> integrated community, as we saw in the past with lldb, for instance.
I think I mentioned this before but some people are waiting for the move
to be able to actually participate in the Flang development. So the
current github contributions do not necessarily reflect the LLVM
developers that will be involved.

On flang-dev [0] we have long term LLVM developers and people that join
the LLVM developers community with the merge of Flang but even those
already actively participated at the LLVM-Dev!

The API usage is a valid concern, among others, which will require code
changes in the near future.

[0] http://lists.llvm.org/pipermail/flang-dev/2019-December/author.html

Thanks,
  Johannes
> On Tue, Jan 7, 2020 at 6:04 AM Peter Waller via llvm-dev <
> llvm-dev at lists.llvm.org> wrote:
> 
> > Hi All,
> >
> > As discussed before Christmas, this is a reminder that we intend to
> > merge flang on the 13th January (next Monday) before the llvm-10
branch.
> > At the moment I'm proposing to do it at 10am GMT. I can be
flexible on
> > this point if it requires close coordination with anyone in another
> > timezone, just let me know.
> >
> > Previous discussion was in [llvm-dev] Flang landing in the monorepo
> >
<http://lists.llvm.org/pipermail/llvm-dev/2019-December/137661.html>.
> >
> > The current plan of action is summarized at
> > <https://github.com/flang-compiler/f18/issues/876>.
> >
> > The result will look a lot like the recent MLIR merge from 24th Dec:
> > <https://github.com/llvm/llvm-project/commits/0f0d0ed1c78>,
commit
> > 0f0d0ed1c78 in the llvm-project monorepo.
> >
> > Once it is done I'll mail the list. If you want to coordinate with
me,
> > please get in touch.
> >
> > Regards,
> >
> > - Peter
> > _______________________________________________
> > LLVM Developers mailing list
> > llvm-dev at lists.llvm.org
> > https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
> >
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev

-- 

Johannes Doerfert
Researcher

Argonne National Laboratory
Lemont, IL 60439, USA

jdoerfert at anl.gov
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On Tue, Jan 7, 2020 at 6:04 AM Peter Waller via llvm-dev <
llvm-dev at lists.llvm.org> wrote:
> Hi All,
>
> As discussed before Christmas, this is a reminder that we intend to
> merge flang on the 13th January (next Monday) before the llvm-10 branch.
>
Why is it targeting pre-llvm10 branching? Are we expecting to ship anything
in LLVM 10? If so I would have expected it to land much much earlier to be
able to stabilize during the development phase long before the branching
point.

-- 
Mehdi


> At the moment I'm proposing to do it at 10am GMT. I can be flexible on
> this point if it requires close coordination with anyone in another
> timezone, just let me know.
>
> Previous discussion was in [llvm-dev] Flang landing in the monorepo
> <http://lists.llvm.org/pipermail/llvm-dev/2019-December/137661.html>.
>
> The current plan of action is summarized at
> <https://github.com/flang-compiler/f18/issues/876>.
>
> The result will look a lot like the recent MLIR merge from 24th Dec:
> <https://github.com/llvm/llvm-project/commits/0f0d0ed1c78>, commit
> 0f0d0ed1c78 in the llvm-project monorepo.
>
> Once it is done I'll mail the list. If you want to coordinate with me,
> please get in touch.
>
> Regards,
>
> - Peter
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>
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On Thu, Jan 9, 2020 at 4:19 AM Mehdi AMINI via llvm-dev
<llvm-dev at lists.llvm.org> wrote:
>
>
>
> On Tue, Jan 7, 2020 at 6:04 AM Peter Waller via llvm-dev <llvm-dev at
lists.llvm.org> wrote:
>>
>> Hi All,
>>
>> As discussed before Christmas, this is a reminder that we intend to
>> merge flang on the 13th January (next Monday) before the llvm-10
branch.
>
>
> Why is it targeting pre-llvm10 branching? Are we expecting to ship anything
in LLVM 10? If so I would have expected it to land much much earlier to be able
to stabilize during the development phase long before the branching point.
I was wondering about this too. I'm not necessarily opposed, but
wouldn't it make sense to target landing soon *after* the branch
instead, to give it time to integrate, stabilize, and then ship in the
next release?

On 07/01/2020 14:03, Peter Waller via llvm-dev wrote:
> this is a reminder that we intend to merge flang on the 13th January (next
Monday) before the llvm-10 branch. At the moment I'm proposing to do it at
10am GMT.
In case you're not following the list closely, the merge is not 
happening at this point in time.

The new intent is to do it after the branch. Specifics will come in due 
course.

Regards,

- Peter