[libcxx] r249738 - Split <ctype.h> out of <cctype>.

[Bruno Cardoso Lopes via cfe-commits]

> Sure, go ahead.

I committed in r284797 and r284801 (libcxx). There's one minor issue
I've found: the changes for the builtins affecting non submodule local
visibility broke current users of plain "-fmodules" against our
frameworks in public SDKs, in 10.11 & 10.12. I've attached a patch to
work around that for the time being: make the new behavior dependent
on local vis. Can you take a look?

> Hmm. Ideally, we should try to pick something that captures the spirit of
> "only non-modular headers and headers from used modules". Something like
> "ignore_modules_not_declared_used", but less wordy?

Right. It's gonna be hard to shrink this to a meaningful short name.
What about a more generic "no_escape"?  "no_undeclared_headers"?

Thanks again,

-- 
Bruno Cardoso Lopes
http://www.brunocardoso.cc
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