aidengrossman added a comment. The main issue here is that there's no way to reliably detect whether the built in is defined (can't check if a function is defined in the preprocessor, preprocessor macro isn't exposed correctly in all configurations), which ends up breaking some configurations. I wouldn't be opposed to exposing things more often, but I'm fine with the builtins being exposed under `-fms-extensions`, we just need to expose the preprocessor macro when we expose the builtins.
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