jpjepko wrote:

I noticed there were some CI issues with file-scope volatiles that were hidden 
by previous failures. Unlike volatile locals, there was no precedent to follow 
in either other clang warnings or GCC. I decided to simply not warn on them 
since those writes may be observed externally (read by other threads, for 
example), unlike volatile locals.

https://github.com/llvm/llvm-project/pull/178342
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