mclow.lists added a comment.
Herald added subscribers: bixia, christof.

What we need to do here is to here is to add a new macro 
`_LIBCPP_ABI_REGEX_MEMORY` in `<__config>` (around line 89) and then make these 
changes available only when this macro is defined.

By default - we get no change.
If `_LIBCPP_ABI_REGEX_MEMORY` is defined, we get the new behavior.

Then we can start adding other ABI changes as well.


https://reviews.llvm.org/D39308



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