[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 #8 from Konstantin Tokarev <annulen at yandex.ru> ---
If we rely on signed overflow anywhere, we must use -fwrapv with GCC and Clang, otherwise this behavior is undefined with these compilers

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