[PATCH] [libc++abi] Add support for cross compiling.

[Dan Albert]

This will need to be revisited to inform LIT once http://reviews.llvm.org/D6985 lands.


REPOSITORY
  rL LLVM

================
Comment at: CMakeLists.txt:138
@@ +137,3 @@
+#===============================================================================
+if(LIBCXXABI_CROSSCOMPILING)
+  option(LIBCXXABI_GCC_TOOLCHAIN "GCC toolchain for cross compiling.")
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Same comments from http://reviews.llvm.org/D6990 apply.

http://reviews.llvm.org/D6991

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