[webkit-dev] Using C++20 in WebKit

[Alex Christensen]

Apple and Sony are finishing updating our build infrastructure to Visual Studio 2022, and we are considering requiring it to build WebKit starting next week.  If anyone has a reason to delay further, please let me know on this list or directly.

> On Jan 24, 2022, at 1:43 PM, Alex Christensen via webkit-dev <webkit-dev at lists.webkit.org> wrote:
> 
> Ok.  We won’t raise the minimum CMake version for all of WebKit right now then, just on Windows when we start requiring VS2022.
> 
>> On Jan 22, 2022, at 1:44 PM, Carlos Alberto Lopez Perez via webkit-dev <webkit-dev at lists.webkit.org> wrote:
>> 
>> On 22/01/2022 01:51, Alex Christensen via webkit-dev wrote:
>>> While we’re updating things, is there any objection to updating the
>>> minimum version of CMake required?  Right now it is 3.12, which was
>>> released in 2018.  Does anyone have any limitations we should consider
>>> when picking a new minimum version?
>>> 
>> 
>> Yes.
>> 
>> CMake is one of the core dependencies for GTK and WPE ports, so the
>> policy of dependencies applies [1]
>> 
>> In practical terms that means that we should support the version of
>> CMake shipped by Debian 10, which is CMake 3.13 until at least 2022-08-14.
>> 
>> However, If the purpose of raising the version is to take advantage of
>> the new Visual Studio generator then I don't think raising the minimum
>> version is needed.
>> 
>> As far as I know you can take advantage of newer CMake features (like
>> support for a newer generator) without needing to raise the minimum
>> version required.
>> 
>> So if you have a newer version of CMake you can simply pass the flag
>> -G"Visual Studio 17 2022" (or similar). Raising the minimum version
>> required of CMake is not needed to use a newer CMake generator, using it
>> can be made optional for those that want (and can) use it.
>> 
>> 
>> [1] https://trac.webkit.org/wiki/WebKitGTK/DependenciesPolicy
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