CMake: Add runtime dir.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@121957 91177308-0d34-0410-b5e6-96231b3b80d8

CMakeLists.txt

@@ -151,7 +151,7 @@ endif ()
 add_subdirectory(include)
 add_subdirectory(lib)
 add_subdirectory(tools)
+add_subdirectory(runtime)
 
 # TODO: docs.
 add_subdirectory(test)
-

runtime/CMakeLists.txt

@@ -0,0 +1,12 @@
+# TODO: Set the install directory.
+
+set(known_subdirs
+  "compiler-rt"
+  "libcxx"
+  )
+
+foreach (dir ${known_subdirs})
+  if (EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/${dir}/CMakeLists.txt)
+    add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/${dir})
+  endif()
+endforeach()