libc++: only #include <cxxabi.h> if it exists. This allows libc++ to build
out of the box on Linux systems. If you're building against libc++abi, you
still need to make sure it can find <cxxabi.h> so it knows not to export
symbols which libc++abi provides.


git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@155091 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed