ChuanqiXu9 wrote:

> To clarify the non-determinism:
Under -fmodules, PCM declarations are lazily deserialized. Due to filesystem 
enumeration order differences (ext4 hash order on Linux vs NTFS alphabetical on 
Windows) during module map scanning, the hypotf declaration from <math.h> 
happened to be eagerly deserialized prior to CodeGen in some environments, but 
remained deferred in others. This caused CodeGen to inconsistently emit either 
@_hypotf (with dllimport) or @hypotf (without dllimport), leading to link 
errors on Windows.

This is not non-determinism to me. It sounds like a bug to me. We should fix 
that.

https://github.com/llvm/llvm-project/pull/204792
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