[PATCH] D27387: [libc++] Add a key function for bad_function_call

[James Y Knight via Phabricator via cfe-commits]

jyknight added a comment.

Since this is only adding a new export to libc++, not changing/breaking existing ones, I don't think it should be grouped with the ABI-breaking changes in v2.

The usual promise is that upgrading libc++.so.1 will not break apps compiled against an older set of headers, not that you're able to compile against a new set of headers and then run on an old libc++.so.1.

That is, even if the use of the new export is put under a #ifdef, it seems like it ought to default "on".


https://reviews.llvm.org/D27387