fjricci added a comment. Currently, the way that we tell users to gate on sanitizer-specific behavior is with `__has_feature(foo_sanitizer)`, as far as I know, it's the only way to do so. LSan provides several API functions for users, ie `__lsan_ignore_object`. If a user program wants to use these API functions in their program, they need a way to check that LSan is enabled at compilation time (even if LSan doesn't actually modify the compile step). I'm not sure of a better or more consistent way to allow that to happen.
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