[Webkit-unassigned] [Bug 215003] New: WebKit failed to build due to error C2280 on windows with MSVC

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=215003

            Bug ID: 215003
           Summary: WebKit failed to build due to error C2280 on windows
                    with MSVC
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: PC
                OS: Windows 10
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: 1998zhangyi at gmail.com

Created attachment 405653

  --> https://bugs.webkit.org/attachment.cgi?id=405653&action=review

build_log

Environment:
VS 2019 + Windows Server 2016

Issue description:
We tried to build WebKit using VS2019 on Windows Server 2016. WebKit failed to build due to error C2280: 'WTF::constexpr_storage_t<T> &WTF::constexpr_storage_t<T>::operator =(const WTF::constexpr_storage_t<T> &)': attempting to reference a deleted function on windows with MSVC. It can be reproduced on master branch latest commit 4d2d7cb. Could you please help take a look at this? Thanks in advance!

Repro steps:
1. git clone https://github.com/WebKit/webkit F:\gitP\WebKit\webkit
2. open a VS 2019 x64 command prompt as admin and browse to F:\gitP\WebKit\webkit
3. set path=F:\tools\WebKit\tools;%path%
4. extra WebKitRequirementsWin64 to F:\gitP\WebKit\webkit\WebKitLibraries\win
5. mkdir build_amd64 && pushd build_amd64
6. cmake -G "Visual Studio 16 2019" -A x64 -DCMAKE_SYSTEM_VERSION=10.0.18362.0 -DCMAKE_BUILD_TYPE=Release -DRUBY_LIBRARY=C:\tools\ruby26\lib -DPORT="WinCairo" -DCMAKE_EXPORT_COMPILE_COMMANDS=ON -DSHOW_BINDINGS_GENERATION_PROGRESS=1 -DDEVELOPER_MODE=ON -DENABLE_EXPERIMENTAL_FEATURES=ON ..
7. msbuild /p:Platform=x64 /p:Configuration=Release WebKit.sln /t:Rebuild

Actual result:
F:\gitP\WebKit\webkit\build_amd64\WTF\Headers\wtf/Optional.h(419,39): error C2280: 'WTF::constexpr_storage_t<T> &WTF::constexpr_storage_t<T>::operator =(const WTF::constexpr_storage_t<T> &)': attempting to reference a deleted function [F:\gitP\WebKit\webkit\build_amd64\Source\JavaScriptCore\JavaScriptCore.vcxproj]

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