nickdesaulniers wrote:

> Was there an RFC for this?

LFI is a (nascent) backend tech; technically a subtly-different ABI from 
something like aarch64-linux-gnu.

https://llvm.org/docs/LFI.html

TL;DR it rewrites loads/stores/syscalls to create a "faster sandbox."

This PR adds controls to whether we skip sanitizing loads or stores 
individually.

> does GCC support this under this spelling

GCC does not support LFI at all (yet).

> is an -m flag the right design

I think so as most `-m` flags have implications on the ABI, but am open to 
suggestions.

https://github.com/llvm/llvm-project/pull/204689
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