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

[Alex Christensen]

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?

> On Jan 21, 2022, at 4:51 PM, Yusuke Suzuki <ysuzuki at apple.com> wrote:
> 
> It sounds nice! New CMake (3.21~) already supports VS 2022.
> 
> -Yusuke
> 
>> On Jan 21, 2022, at 10:36 AM, Alex Christensen <achristensen at apple.com <mailto:achristensen at apple.com>> wrote:
>> 
>> Related to the C++20 change, I’m working on moving the Visual Studio build to Visual Studio 2022.  I’ve informed several involved parties directly, but now I’ve informed everyone.  If anyone has a reason not to move to VS2022, please let me know.
>> 
>>> On Jan 6, 2022, at 2:11 AM, Yusuke Suzuki <ysuzuki at apple.com <mailto:ysuzuki at apple.com>> wrote:
>>> 
>>> We cannot use char8_t since it is not available in GCC 8.3.0 :)
>>> 
>>> -Yusuke
>>> 
>>>> On Jan 5, 2022, at 7:43 PM, Alex Christensen via webkit-dev <webkit-dev at lists.webkit.org <mailto:webkit-dev at lists.webkit.org>> wrote:
>>>> 
>>>> I, with great help from several of you, got https://bugs.webkit.org/show_bug.cgi?id=233963 <https://bugs.webkit.org/show_bug.cgi?id=233963> compiling on all platforms, but several of the JSC bots are still red.  I’m under the impression that they either need a clean build or I’ve missed something.  Could a JSC bot maintainer look into it?
>>>> 
>>>>> On Dec 7, 2021, at 2:38 PM, Carlos Alberto Lopez Perez via webkit-dev <webkit-dev at lists.webkit.org <mailto:webkit-dev at lists.webkit.org>> wrote:
>>>>> 
>>>>> On 06/12/2021 22:36, Yusuke Suzuki via webkit-dev wrote:
>>>>>> I recently upgraded GCC requirement to 8.3.0 based
>>>>>> on https://trac.webkit.org/wiki/WebKitGTK/GCCRequirement <https://trac.webkit.org/wiki/WebKitGTK/GCCRequirement>
>>>>>> <https://trac.webkit.org/wiki/WebKitGTK/GCCRequirement <https://trac.webkit.org/wiki/WebKitGTK/GCCRequirement>> (https://trac.webkit.org/changeset/283348/webkit <https://trac.webkit.org/changeset/283348/webkit>
>>>>>> <https://trac.webkit.org/changeset/283348/webkit <https://trac.webkit.org/changeset/283348/webkit>>)
>>>>>> As a result, we can use some of C++20 features.
>>>>>> I wonder if we can flip C++20 now. While some of C++20 features cannot
>>>>>> be used since GCC 8.3.0 does not support, but some of features can be
>>>>>> used, and it is super useful.
>>>>> 
>>>>> From the PoV of WebKitGTK I think it is Ok to enable now the building
>>>>> with C++-20 support and to start using the C++-20 features already
>>>>> supported by GCC 8.3.0
>>>>> 
>>>>> Check here: https://gcc.gnu.org/projects/cxx-status.html <https://gcc.gnu.org/projects/cxx-status.html> which C++-20
>>>>> features are supported by GCC 8
>>>>> 
>>>>> Before using them I think it would be a good idea to double-check if
>>>>> those are also supported by the minimum version of Clang that we want to
>>>>> support.
>>>>> And maybe also to check if those are supported by MS Visual C++ ?
>>>>> I say maybe because I'm not sure if we support this compiler.
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>>>>> https://lists.webkit.org/mailman/listinfo/webkit-dev <https://lists.webkit.org/mailman/listinfo/webkit-dev>
>>>> 
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>>> 
>> 
> 

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