libc++ 3.9.0 packaging improvements

[Pauli .]

On Tue, Nov 1, 2016 at 6:29 PM, Pauli . <suokkos at gmail.com> wrote:

>> In a chroot, tests are failing with:
>> /usr/bin/ld: cannot find -lc++
>
> -lc++ shouldn't be included for libc++abi. I didn't see that appearing
> in my system. Full log could help figure out what went wrong.
>

Adding LIBCXXABI_LIBCXX_LIBRARY_PATH to libcxxabi cmake options would
fix the issue. I didn't notice the test problem because I had libc++1
installed when building and running tests.

-DLIBCXXABI_LIBCXX_LIBRARY_PATH=$(abspath libcxx/$(BUILDDIR)/lib)\