Move Scalac backend fork to lampepfl

[felixmulder]

No description provided.

[DarkDimius]

@felixmulder, what does this task mean?

[felixmulder]

Good question - I'd rather @smarter or @odersky explain this for fear of getting it wrong. Otherwise let's talk about it on Tuesday.

[lrytz]

please summarize the discussion here once things clear up, i'd like to be in the loop on this one, understand what is meant.

[odersky]

I think the idea is that we see little value maintaining the scalac backend
bridge. Right now it looks to us that this bridge won't be maintained by
the Scala team. So this means that

(1) we are still tied to a snapshot of the scalac backend, instead of
being able to upgrade continuously
(2) only Dmitry knows how to do fixes for the backend
(3) Doing any fixes to the backend is needlessly complex in both
development and deployment.

It seems more straightforward to just directly link to a version of the
backend and merge scalac improvements into it as they come online.

That's my tentative summary from talking to some of the people here. Quite
happy to revise it if different arguments come up.

Cheers

• Martin

On Fri, Sep 16, 2016 at 9:04 PM, Lukas Rytz notifications@github.com
wrote:

please summarize the discussion here once things clear up, i'd like to be
in the loop on this one, understand what is meant.

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summarize the discussion here once things clear up, i'd like to be in the
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Prof. Martin Odersky
LAMP/IC, EPFL

[lrytz]

directly link to a version of the backend

Do you mean to copy the source into the dotty compiler?

I think the original idea was to merge the backend abstraction layer into the Scala compiler, there was an attempt, but that didn't get very far (scala/scala#4136). The work to get that in would have to come from dotty's side.

There is likely some value in keeping the same backend for the two compilers (there will be in the future). But if you're hitting a wall with the current solution it might make sense to go the other way.

[odersky]

On Fri, Sep 16, 2016 at 10:01 PM, Lukas Rytz notifications@github.com
wrote:

directly link to a version of the backend

Do you mean to copy the source into the dotty compiler?

I think the original idea was to merge the backend abstraction layer into
the Scala compiler, there was an attempt, but that didn't get very far (
scala/scala#4136 scala/scala#4136). The work to
get that in would have to come from dotty's side.

Yes, that's the crux of the matter. There's nobody willing to sign up to do
this. Since we are a volunteering effort there's little we can do to change
this.

There is likely some value in keeping the same backend for the two
compilers (there will be in the future). But if you're hitting a wall with
the current solution it might make sense to go the other ways.

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You are receiving this because you were mentioned.
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#1520 (comment),
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updates":{"snippets":[{"icon":"PERSON","message":"@lrytz in #1520: \u003e
directly link to a version of the backend\r\n\r\nDo you mean to copy the
source into the dotty compiler?\r\n\r\nI think the original idea was to
merge the backend abstraction layer into the Scala compiler, there was an
attempt, but that didn't get very far (https://github.com/scala/
/pull/4136). The work to get that in would have to come from dotty's
side.\r\n\r\nThere is likely some value in keeping the same backend for the
two compilers (there will be in the future). But if you're hitting a wall
with the current solution it might make sense to go the other
way."}],"action":{"name":"View Issue","url":"https://github.
com//issues/1520#issuecomment-247694859"}}}

Prof. Martin Odersky
LAMP/IC, EPFL

[felixmulder]

It has been decided to keep the 2.11 backend fork from @DarkDimius, but to move it into the lampepfl organization

[DarkDimius]

Moved to http://github.com/lampepfl/scala/