[lldb-dev] clang::VersionTuple

Tue May 8 11:46:43 PDT 2018

> On May 8, 2018, at 11:37 AM, Greg Clayton <clayborg at gmail.com> wrote:
> 
> I was referring to the Swift and Apple internal branches. They tend to lock down against older llvm and clang repositories so when we put changes in llvm or clang that are required for LLDB, it makes merging a bit tougher in those cases. Again, I am not affected by this, just trying to watch out for you guys.

I understand and I appreciate it, I was just worried that I’m missing something obvious. We branch LLDB at the same time as LLVM so that’s not actually an issue. Of course, it might cause merge conflicts or make it harder to cherry-pick patches, but that's just living downstream.

Fred 

> Greg
> 
> 
>> On May 8, 2018, at 11:35 AM, Greg Clayton <clayborg at gmail.com <mailto:clayborg at gmail.com>> wrote:
>> 
>> I'm good if Apple is good. 
>> 
>>> On May 8, 2018, at 11:31 AM, Frédéric Riss <friss at apple.com <mailto:friss at apple.com>> wrote:
>>> 
>>> 
>>> 
>>>> On May 8, 2018, at 10:04 AM, Greg Clayton via lldb-dev <lldb-dev at lists.llvm.org <mailto:lldb-dev at lists.llvm.org>> wrote:
>>>> 
>>>> 
>>>> 
>>>>> On May 8, 2018, at 9:47 AM, Zachary Turner <zturner at google.com <mailto:zturner at google.com>> wrote:
>>>>> 
>>>>> We don’t want the lowest levels of lldb to depend on clang. If this is useful we should move it from clang to llvm and use llvm::VersionTuple
>>>> 
>>>> I agree, though this move will cause merging issues for many that have repositories that link against older llvm/clang. Doesn't affect me anymore, but Apple will be affected.
>>> 
>>> I’m not sure I understand what issues you’re referring to, we don’t link new LLDBs to old clangs (and even if we did, it wouldn’t be something the that drives community decisions).
>>> 
>>> Fred
>>> 
>>>> Greg
>>>> 
>>>>> On Tue, May 8, 2018 at 9:26 AM Greg Clayton via lldb-dev <lldb-dev at lists.llvm.org <mailto:lldb-dev at lists.llvm.org>> wrote:
>>>>> No issues from me.
>>>>> 
>>>>> > On May 8, 2018, at 9:11 AM, Pavel Labath via lldb-dev <lldb-dev at lists.llvm.org <mailto:lldb-dev at lists.llvm.org>> wrote:
>>>>> > 
>>>>> > While moving Args around, I noticed that we have a bunch of
>>>>> > functions/classes that pass/store version numbers as a triplet of integers
>>>>> > (e.g. Platform::GetOSVersion). I got halfway into creating a wrapper class
>>>>> > for that when I noticed clang::VersionTuple, which is pretty much what I
>>>>> > wanted out of the box.
>>>>> > 
>>>>> > Now there are small differences between this class, and what we have now:
>>>>> > it has an extra fourth "build" field, and it uses only 31 bits to represent
>>>>> >  the values. None of these seem to matter (particularly as we are
>>>>> > converting our representation into this struct in some places) that much,
>>>>> > but before I go through the trouble of pulling this class into llvm
>>>>> > (although technically possible, it seems wrong to pull a clang dependency
>>>>> > at such a low level), I wanted to make sure we are able to use it.
>>>>> > 
>>>>> > Do you see any reason why we could not replace our version triplets with
>>>>> > clang::VersionTuple ?
>>>>> > 
>>>>> > cheers,
>>>>> > pl
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