fmayer wrote:

> What else even uses the level? __builtin_object_size codegen? Can you add a 
> DocBrief to the flag explaining when you'd want to use it?

Let me find out details. We have some code that miscompiles with 
`-fstrict-flex-arrays=1`, so something is exploiting the UB. 

https://github.com/llvm/llvm-project/pull/126163
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