PATCH: (kind of) to improve support for libc++ with libsupc++

[Howard Hinnant]

On Sep 25, 2013, at 1:43 PM, Chandler Carruth <chandlerc at google.com> wrote:

> It appears that there is file in libc++ whose entire contents are provided by libc++abi / libcxxrt / libsupc++:
> 
> src/typeinfo.cpp
> --------
> ...
> #if !(defined(_LIBCPPABI_VERSION) || defined(LIBCXXRT))
> ...
> #endif
> --------
> 
> So, only headers are included before the #if. So for users of libc++abi and libcxxrt, this translation unit is empty.
> 
> For users of libsupc++, the symbols defined here produce link errors as they are always provided by libsupc++.
> 
> Any objections to my deleting this file?
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Yes, I object.  Please do not delete libcxx/src/typeinfo.cpp at this time.  This file is still in active use.  Instead #ifdef out any offending symbols.

Thanks,
Howard