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

[Chandler Carruth]

On Wed, Sep 25, 2013 at 2:34 PM, Howard Hinnant <howard.hinnant at gmail.com>wrote:

> Background:  libcxx used to define these symbols.  We are in the middle of
> migrating them from libcxx to libcxxabi, and for now we need to support
> both places (while in this transition period).  I would suggest #ifdef-ing
> on something that only will be defined in the environment where these
> symbols are causing a problem (users of libsupc++).  I don't know what the
> #ifdef will be for that environment.  But on some of my platforms of
> interest _LIBCPPABI_VERSION will not be defined, and I will need the
> symbols inside of that #ifdef (on the front side of this transition period).
>
> A couple of years from now, then we can probably get rid of this file.
>

Cool. The macro is __GLIBXX__, I can make the #if here look exactly like
that in src/exception.cpp:
45:#if !defined(LIBCXXRT) && !defined(_LIBCPPABI_VERSION) &&
!defined(__GLIBCXX__)
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