EricWF added a comment.
> It looks like this is caused by functions in libc++'s headers that are marked
> to always be inlined. Since they are always inlined there is external
> definition for the linker to get the address of. I have worked around this by
> adding the no_instrument_function attribute to _LIBCPP_INLINE_VISIBILITY and
> _LIBCPP_ALWAYS_INLINE.
That isn't quite correct. This problem only occurs on methods which are
externally instantiated withing the dylib but there definitions are marked
`__attribute__((visibility("hidden")))`.
For example `std::string` and `std::num_get`. Therefore the compiler *knows*
there is an externally available definition but its hidden from the linker.
I would prefer to fix this by using `_LIBCPP_EXTERN_TEMPLATE_INLINE_VISIBILITY`
on these methods instead of `_LIBCPP_INLINE_VISIBILITY` or
`_LIBCPP_ALWAYS_INLINE` instead.
https://reviews.llvm.org/D25897
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