efriedma-quic wrote:

> > Can we restrict this to targets where libm actually modifies errno?
> 
> Do you mean it is better to have a function list, which actually modifies 
> `errno` ? For example, we should restrict to `__exp10`, but but not a general 
> top call `__exp `?

I said targets, not functions.  For example, MacOS never set errno for math 
functions.

https://github.com/llvm/llvm-project/pull/96025
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