[Webkit-unassigned] [Bug 188460] [CMake] Add ENABLE_UNDEFINED_BEHAVIOR_SANITIZER to make it easier to build with UBSan

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=188460

--- Comment #7 from Jonathan Bedard <jbedard at apple.com> ---
(In reply to Michael Catanzaro from comment #6)
> ...
> 
> Perhaps, but perhaps undefined behavior should always be avoided.

Completely avoiding all behavior UBSan flags will likely be controversial. As an example, (if I'm remember correctly, been a while since I worked with this) signed integer overflow is undefined behavior according to the C++ standards, but in practice, most compilers DO define this behavior so there are a few spots where we do (or perhaps did) rely on this being defined behavior.

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