zturner added a comment. It's not enough to just set `_HAS_EXCEPTIONS=1`, it has to match whatever the value of `/EH` is passed to the compiler. So if we need to be able to throw catch exceptions, then you should pass `/EHsc` and not touch `_HAS_EXCEPTIONS` (technically you could set it to 1 but that's the default). And if we don't need to be able to throw or catch exceptions, then we pass `/EHs-c-` (which is what we do today) and also set `_HAS_EXCEPTIONS=0`. But the two should agree with each other.
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