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

[Chandler Carruth]

On Wed, Sep 25, 2013 at 2:40 PM, Chandler Carruth <chandlerc at google.com>wrote:

>
> 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__)
>

Which makes the patch as attached...
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