why to (not) support "older" compiler versions

[Daniel Murphy via Digitalmars-d]

On 4/11/2015 3:12 AM, Johannes Pfau wrote:
>
> A crazy idea:
> Once gdc supports the latest frontend version we could theoretically
> adjust the dmd pull request testing to also merge dmd pull requests
> into the gdc frontend and test gdc with these frontend-only requests. We
> would then only merge dmd pull requests that build for gdc as well. Then
> we would need some hooks to also automatically pull these into gdc. Or
> we could setup the frontend as a submodule.
>


It's not a crazy idea at all.  The problem is that we will need to get 
the compilers in sync first, and I'm not sure that's getting any closer 
to being reality.

I think the number of pull requests touching the glue layer is low 
enough that it would work, once the CI system is set up to enforce it.