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

Doerfert, Johannes via cfe-dev cfe-dev at lists.llvm.org
Thu Jun 11 15:06:25 PDT 2020

On 6/11/20 4:04 PM, James Y Knight wrote:
> 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.

That clears things up, thanks a lot. So we could have a frontend-support

subproject for non-LLVM(-IR) related things and `llvm/lib/Frontend` for

LLVM(-IR) related stuff, e.g., IR generation parts.



> 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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