[Webkit-unassigned] [Bug 187971] Move-constructing NeverDestroyed should move construct underlying object instead of copy constructing it

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=187971

--- Comment #2 from Daniel Bates <dbates at webkit.org> ---
I suspect the reason this does not effect Windows is because MS Visual Studio has a more aggressive optimizer that elides the call to the NeverDestroyed move constructor. Such aggressive eliding is allowed to be performed even if the move constructor has side effects in C++14, but not required. As of C++17 such an optimization is required by all compiler writers and is consistent with my observation that I do not get a compile-time error when compiling the code in comment #0 with clang using C++17.

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