Template Haskell and stage-1

[Carter Schonwald]

This sort of ties into some of the post 7.8 build system cleanup plans
perhaps?


On Wed, Nov 6, 2013 at 12:19 PM, Gabor Greif <ggreif at gmail.com> wrote:

> Maybe DPH just should be left out of being built in the default target?
>
> Just an idea,
>
>    Gabor
>
> On 11/6/13, Ian Lynagh <igloo at earth.li> wrote:
> > On Wed, Nov 06, 2013 at 01:43:02PM +0000, Simon Peyton-Jones wrote:
> >> I'd like to make -XtemplateHaskell simply illegal in a stage-1 compiler.
> >> After all, it is!
> >> But for some reason we use the stage1 compiler to generate dependencies
> >> for the DPH libraries; those libraries have {-# LANGUAGE TemplateHaskell
> >> #-}, so the dependency generation fails.  See below.
> >> But WHY do we generate deps for DPH with stage1?  We don't *compile* the
> >> DPH libraries with stage1, because they need TH.  Can't we just generate
> >> deps with stage2?
> >
> > It's due to the build system phases:
> >
> http://ghc.haskell.org/trac/ghc/wiki/Building/Architecture/Idiom/PhaseOrdering#GHCsphases
> >
> > Stage2 doesn't exist during the phase in which DPH is configured.
> > Changing it to use stage 2 would probably mean adding another phase for
> > things that need to be configured by stage 2. This might mean slower
> > builds due to loss of parallelism, I'm not sure.
> >
> > Perhaps the decision to build DPH with the GHC build system should be
> > revisited? It causes some complication, and it seems that more and more
> > people are disabling it anyway, in order to get faster builds.
> >
> >
> > Thanks
> > Ian
> >
> > _______________________________________________
> > ghc-devs mailing list
> > ghc-devs at haskell.org
> > http://www.haskell.org/mailman/listinfo/ghc-devs
> >
> _______________________________________________
> ghc-devs mailing list
> ghc-devs at haskell.org
> http://www.haskell.org/mailman/listinfo/ghc-devs
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.haskell.org/pipermail/ghc-devs/attachments/20131106/caaddcec/attachment.html>