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

[Andrzej Warzynski via flang-dev]

FYI: this RFC will be discussed in the next Flang Technical Community 
call: http://lists.llvm.org/pipermail/flang-dev/2020-June/000379.html

-Andrzej

On 11/06/2020 23:06, Doerfert, Johannes wrote:
> 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.
> 
> 
> Thanks,
> 
>     Johannes
> 
> 
>> 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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>