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

[Adrian Prantl via cfe-commits]

> On Oct 16, 2015, at 3:27 PM, Richard Smith <richard at metafoo.co.uk> wrote:
> 
> On Thu, Oct 15, 2015 at 11:14 AM, Adrian Prantl <aprantl at apple.com <mailto:aprantl at apple.com>> wrote:
> 
>> On Oct 14, 2015, at 5:07 PM, Richard Smith <richard at metafoo.co.uk <mailto:richard at metafoo.co.uk>> wrote:
>> 
>> Ack, there are non-modular headers in the Darwin module. =( I seem to recall that they're not version-locked to your compiler, so we've got to support them as-is?
>> 
>> If we can't turn on local submodule visibility, then we need a module map for libc++ that covers all of its headers. I'll look into pruning the include path when building a module from an implicitly-loaded module map.
> 
> The attached patch implements this in the most hacky way; with it I can successfully compile the first few hundred files of LLVM.
> 
> Slightly less hacky approach attached, does this also unstick you? 
> <no-undeclared-includes.diff>

Unfortunately, no. After looking at it in the debugger, I believe the problem is that HeaderSearch looks at RequestingModule->NoUndeclaredIncludes, but the RequestingModule is a nullptr (while looking for cdefs.h included via assert.h, for example).

— adrian

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