[PATCH] [libcxxabi] Add lit configs for libcxxabi tests.

[Saleem Abdulrasool]

================
Comment at: CMakeLists.txt:104
@@ -103,2 +103,3 @@
 option(LIBCXXABI_ENABLE_WERROR "Fail and stop if a warning is triggered." OFF)
-option(LIBCXXABI_ENABLE_SHARED "Build libc++abi as a shared library." OFF)
+option(LIBCXXABI_ENABLE_SHARED "Build libc++abi as a shared library." ON)
+
----------------
Dan Albert wrote:
> Saleem Abdulrasool wrote:
> > Did you intend to make this shared by default?
> Yes. See the long part of the summary. I'm willing to change this back to the way it was if people think that's better.
I think moving the comment here would be better.

================
Comment at: CMakeLists.txt:110
@@ +109,3 @@
+  else()
+    set(LIBCXXABI_LIBCXX_INCLUDES "${LLVM_INCLUDE_DIR}/c++/v1")
+  endif()
----------------
Dan Albert wrote:
> Saleem Abdulrasool wrote:
> > I think that you should use a separate variable (LIBCXX_INCLUDE_DIR perhaps?) that is set to ${CMAKE_CURRENT_BINARY_DIR}/include rather than relying on LLVM's variable.
> > 
> > I realize that this is a standalone build, and therefore LLVM_INCLUDE_DIR *should* point to the same location, but it makes it something that you need to reason out (at least, I had to think about it for a moment).
> I don't understand. ${CMAKE_CURRENT_BINARY_DIR}/include won't contain the libcxx headers...
AIUI, thats what it will be set to.  It does actually get the headers copied there (at least, it did in my local tree).

================
Comment at: test/lit.cfg:1
@@ +1,2 @@
+# -*- Python -*- vim: set syntax=python tabstop=4 expandtab cc=80:
+
----------------
Dan Albert wrote:
> Saleem Abdulrasool wrote:
> > Is this the format that the rest of the python code in LLVM uses?  I don't really care at the end of the day, just curious.
> I assumed it was. I copied it from libcxx/test/lit.cfg. I'll look in to it.
> 
> As a somewhat related note, there's a lot of redundancy between here and the lit.cfg in libcxx. It'd be nice to factor that out at some point...
WFM.  As I said, it was more that I was just surprised.  Sharing that would be *great*.

http://reviews.llvm.org/D4414