[PATCH][www] Mention that libcxx is necessary on OS X

[Nico Weber via cfe-commits]

On Mon, Sep 7, 2015 at 9:17 AM, Kuba Brecka <jbrecka at apple.com> wrote:

>
> > On 07 Sep 2015, at 17:21, Nico Weber <thakis at chromium.org> wrote:
> >
> > libcxx is needed to run compiler-rt tests, but it shouldn't be needed to
> run clang's tests. And to _use_ your self-built compiler, you need to add
> `-isysroot $(xcrun -show-sdk-path)` to the compile flags to let the
> compiler find C headers anyway, which also makes it find the libc++ headers.
>
> No, it doesn’t:
>
>    $ clang++ a.cpp  # System version.
>    $ clang++ a.cpp -isysroot $(xcrun --show-sdk-path)  # System version.
>    $ ./clang++ ~/test/cpp101.cpp  # Self-built version.
>        a.cpp:1:10: fatal error: 'iostream' file not found
>    $ ./clang++ a.cpp -isysroot $(xcrun --show-sdk-path)  # Self-built
> version.
>        a.cpp:1:10: fatal error: 'iostream' file not found
>

Then this patch looks fine :-) Not sure if libcxxabi is needed though.
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