arichardson wrote:

> Hi @arichardson.
> 
> Thanks for this change. Acc to the doc which I have `The char type is 
> unsigned by default for Xtensa processors.` Our GCC Xtensa toolchain also 
> interprets char type as unsigned by default.

Thanks, do you believe we need a backwards compatibility flag for the ABI to be 
consistent with older clang or is this safe to land?

https://github.com/llvm/llvm-project/pull/115967
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