Unable to compile ghc-8.2.2 with ghc-8.4.3

[Ben Gamari]

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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