Unable to compile ghc-8.2.2 with ghc-8.4.3

[Sam Halliday]

Hi Ben,

Updating the new build tool is e right thing to do, long term, but it
unfortunate doesn't help with my objective of compiling old versions of ghc
... but there is a quick here that I could exploit. Since I'm building for
the same platform, bug just using different versions of the operating
system, I think I can create the C files in an old Debian inside docker and
use them in the more modern host machine to build the old ghc.

On Fri, 31 Aug 2018, 15:36 Ben Gamari, <ben at smart-cactus.org> wrote:

> Sam Halliday <sam.halliday at gmail.com> writes:
>
> > Hi Ben,
> >
> > This would definitely help. I could use a docker image of a really old
> > OS that has old ghc binaries available, to generate the .c for that
> > old version of GHC (e.g. v 7.0 or something). Then I could use those
> > files to bootstrap a ghc 7.0 on my machine, and from there every
> > version of ghc since. It would make a lot of sense for the
> > "unregistered" sources to be made available as an optional download
> > alongside the source code, if haskell.org were open to that
> > possibility.
> >
> This is a very interesting idea. The build system currently isn't
> really setup in a way to make this possible, but this could likely be
> changed in our new build system, Hadrian. Also, I suspect this would
> require some adjustments to the C code generator, which very likely has
> some platform dependence in its output.
>
> Perhaps you'd like to try picking up this task?
>
> Cheers,
>
> - Ben
>
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