Hadrian

[Simon Peyton Jones]

OK.  So it's a bug.  Do we have an open Hadrian ticket to track it?  If
not, might you open one?

Make *already *no longer exists, incidentally.   Nowadays we need ghc-9.2
to build HEAD, and make doesn't work with ghc-9.2 for some reason.   So I
believe that make is dead for HEAD at least.

Simon

On Mon, 11 Jul 2022 at 16:36, Zubin Duggal <zubin at well-typed.com> wrote:

> Yes, but as Sylvain noted, the configure step (which generates ghc.cabal
> and so is particularly sensitive to changes in module structure) is not
> tracked by hadrian at the moment. We could in principle fix this, and
> as also noted by Sylvain this will become much easier once Make no longer
> exists.
>
> On 22/07/11 16:25, Simon Peyton Jones wrote:
> >>
> >> It is advisable to do this after
> >> rebasing, especially if the rebase involves changes to the module
> >> structure or build system.
> >
> >
> >But *any* commit could involve such a change.  Isn't it a goal of Hadrian
> >to respond to, well, changes?   For example, it is clever enough to
> rebuild
> >Hadrian itself when it changes.
> >
> >It's a bit unsatisfying to say "it'll usually work, but if anything
> strange
> >happens, just make clean and try again".  Understandable perhaps, but not
> >satisfying.
> >
> >Simon
> >
> >On Mon, 11 Jul 2022 at 16:19, Sylvain Henry <sylvain at haskus.fr> wrote:
> >
> >> Hi Simon,
> >>
> >> You have to re-run `./configure` in cases like this. It's because
> >> `compiler/ghc.cabal` is generated from `compiler/ghc.cabal.in` by
> >> `./configure`. This isn't tracked by Hadrian.
> >>
> >> >Surely that should not happen? I'll try make clean; but isn't this a
> bug?
> >>
> >> Hopefully when `make` build system will be removed it should be easy to
> >> make Hadrian (instead of `./configure`) generate and track this file. In
> >> fact I already did this in a MR more than a year ago but it was blocked
> on
> >> make-removal.
> >>
> >> Sylvain
> >>
> >>
> >> On 11/07/2022 17:09, Simon Peyton Jones wrote:
> >>
> >> (apols for premature send)
> >>
> >> I am working on a branch of GHC, actually on !8210.  I have rebased on
> >> master.  Then I say
> >> hadrian/build
> >> and I get the log below.  It falls over saying
> >> No generator for _build/stage0/compiler/build/GHC/Unit/Module/Name.hs.
> >>
> >> Surely that should not happen?
> >>
> >> I'll try make clean; but isn't this a bug?
> >>
> >> Simon
> >>
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