[libcxx][PATCH] Fix for CMakelists.txt

[Michael Spencer]

On Sun, Mar 31, 2013 at 8:29 AM, Howard Hinnant <hhinnant at apple.com> wrote:

> I know nothing about the CMake build system.  Please review:
>
> Thanks,
> Howard
>
> -----------
> The problem is the cmake script for libcxx is broken. I've attached what I
> think is the right fix for it. It was failing to copy cxxabi.h to the right
> place because it was generating to destination path like so
> /include/${dstdir}/ and dstdir can legally be blank from my interpretation
> of the script, and this would then generate a path like libcxx/include//
> which is illegal.
>

LGTM. Although I wonder why it worked for me.

- Michael Spencer
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