[flang-dev] [cfe-dev] [RFC] Refactor Clang: move frontend/driver/diagnostics code to LLVM

[James Y Knight via flang-dev]

I think the expectation is that LLVM remains at the bottom of the
dependency tree, with frontend-support depending on LLVM, and Clang and
Flang depending on frontend-support (and LLVM).

Not everything which makes sense to share between clang and flang makes
sense to be part of llvm core. E.g., implementation of a GCC-compatible
command-line compiler-driver seems like it would be very much out-of-place
in llvm core.


On Thu, Jun 11, 2020 at 10:28 AM Doerfert, Johannes via cfe-dev <
cfe-dev at lists.llvm.org> wrote:

> On 6/11/20 3:32 AM, Andrzej Warzynski wrote:
> >
> >
> > On 11/06/2020 00:49, Michael Kruse wrote:
> >> Am Mi., 10. Juni 2020 um 10:04 Uhr schrieb Doerfert, Johannes via
> >> flang-dev <flang-dev at lists.llvm.org>:
> >>> I'm not against a subproject *but* if we also move the existing
> >>> llvm/lib/Frontend stuff, that would introduce a dependence from
> >>> llvm-core to this project, which I think is uncommon. We could also
> >>> have
> >>> both. At the end of the day it depends on the benefit we would get from
> >>> an independent subproject.
> >>
> >> If we have non-conditional dependencies llvm-core->frontend-support
> >> and frontend-support->llvm-core, what advantage is there left of
> >> making frontend-support a subproject? Both of them are required all
> >> the time.
> >>
> >> Michael
> >>
> >
> > Thanks for the feedback! It sounds like we should keep
> > llvm/lib/Frontend in LLVM and `frontend-support` would be a new
> > subproject for things unrelated to LLVM IR.
>
> Sure, if we expect usage of such a subproject without llvm-core. (Maybe
> there are other reasons to separate it but I'm not sure I understood them.)
>
>
> Thanks,
>
>    Johannes
>
>
> >
> > -Andrzej
>
>
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