[PATCH] [libcxxabi] Add a cmake build system.

[Saleem Abdulrasool]

================
Comment at: src/CMakeLists.txt:2
@@ +1,3 @@
+# Get sources
+file(GLOB LIBCXXABI_SOURCES *.cpp)
+
----------------
Im not a big fan of GLOB.  I think that the number of files is tractable enough that we could enumerate them explicitly.

http://reviews.llvm.org/D4359