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I know, but the point is to make the compiler more predictable, and therefore better. For example, CLANG doesn't have this issue.

And this is related to a possible security vulnerability, so it should be taken more seriously.

and clang could any day introduce this behavior if it happened as a consequence of a newly added optimization or something like this. Most "weird" cases like this are in the end consequences of optimizations (that people really want and expect of C) combining in a way that causes them. It's not like compiler authors add those issues for fun.

C isn't friendly when it comes to this, UB is dangerous, but given the overall attitude of the ecosystem it's pretty pointless to complain about it.

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