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You cant touch C++ without bringing the object lifetime stuff in. And unlike strict aliasing, theres no flag to turn it off.

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Object lifetime is the entire point of C++ and it solves ~100% of the emergent flaws in C programs.

I was just dealing with this: https://bugs.gentoo.org/show_bug.cgi?id=974323.

Also std::start_lifetime_at is a hack and ive seen nobody using it in all the placed where it aught to be used.

If optimizing based on object lifetimes could be turned off, itd be turned off everywhere for hardening like strict aliasing is.

In my personal opinion, the fix[1] for that issue clearly implicates C-style habits polluting a C++ code base. No right-thinking knower of C++ initializes objects with memset! Also I believe that -Wall would have flagged that, and I know for certain that cppcoreguidelines-init-variables + cppcoreguidelines-pro-type-member-init would have flagged it.

1: https://github.com/llvm/llvm-project/commit/905a88b923433eb8...

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