Hi Herb

If you grep around the WebKit codebase for COMPILER(MSVC) there are a number of 
workarounds hanging out. Some may have been fixed over time but the workaround 
wasn’t removed.

Biggest issue was around the JIT and some other low level features the JSC 
folks utilize that isn’t present in MSVC. The lion’s share of JSC development 
is done using Clang and those working on it don’t have a Windows box handy so 
we have seen the JIT break on Windows. Yusuke I’m sure has a list of feature 
requests that would improve the quality of MSVC for people developing VMs.

MSVC has definitely caught some issues in the code and compiler mono-culture 
isn’t great but realistically we don’t have the resources to keep MSVC up and 
running.

Regards,
Don

From: Jean-Yves Avenard via webkit-dev <webkit-dev@lists.webkit.org>
Sent: Wednesday, May 1, 2024 5:10 PM
To: Herb Sutter <herb.sut...@gmail.com>
Cc: Webkit Development List <webkit-dev@lists.webkit.org>
Subject: Re: [webkit-dev] Proposal: Dropping MSVC support and use clang-cl 
exclusively on Windows

Hi


On 2 May 2024, at 10:07 am, Herb Sutter via webkit-dev 
<webkit-dev@lists.webkit.org<mailto:webkit-dev@lists.webkit.org>> wrote:


We’ve had full C++20 including concepts for a couple of years so I wasn’t sure 
what problem you were running into… are you encountering bugs in those 
features? or you can’t turn on /std:c++20 for some reason? or are you using an 
older pre-concepts (pre-VS2022 17.0) compiler?

Thanks for any feedback you have time to share.

Herb


We’ve had issues where some use of concepts made the latest MSVC compiler crash
See 
https://searchfox.org/wubkat/source/Source/WTF/wtf/TypeTraits.h#145-172<https://searchfox.org/wubkat/source/Source/WTF/wtf/TypeTraits.h#145-172>

See 
https://bugs.webkit.org/show_bug.cgi?id=261598<https://bugs.webkit.org/show_bug.cgi?id=261598>

Jean-Yves
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