Index: cmake/Modules/CompilerRTUtils.cmake
===================================================================
--- cmake/Modules/CompilerRTUtils.cmake
+++ cmake/Modules/CompilerRTUtils.cmake
@@ -197,10 +197,15 @@
     message(FATAL_ERROR "llvm-config failed with status ${HAD_ERROR}")
   endif()
   string(REGEX REPLACE "[ \t]*[\r\n]+[ \t]*" ";" CONFIG_OUTPUT ${CONFIG_OUTPUT})
-  list(GET CONFIG_OUTPUT 0 LLVM_BINARY_DIR)
-  list(GET CONFIG_OUTPUT 1 LLVM_TOOLS_BINARY_DIR)
-  list(GET CONFIG_OUTPUT 2 LLVM_LIBRARY_DIR)
-  list(GET CONFIG_OUTPUT 3 LLVM_MAIN_SRC_DIR)
+  list(GET CONFIG_OUTPUT 0 LLVM_OBJ_ROOT)
+  list(GET CONFIG_OUTPUT 1 TOOLS_BINARY_DIR)
+  list(GET CONFIG_OUTPUT 2 LIBRARY_DIR)
+  list(GET CONFIG_OUTPUT 3 MAIN_SRC_DIR)
+
+  set(LLVM_BINARY_DIR ${LLVM_OBJ_ROOT} CACHE PATH "Path to LLVM build tree")
+  set(LLVM_TOOLS_BINARY_DIR ${TOOLS_BINARY_DIR} CACHE PATH "Path to llvm/bin")
+  set(LLVM_LIBRARY_DIR ${LIBRARY_DIR} CACHE PATH "Path to llvm/lib")
+  set(LLVM_MAIN_SRC_DIR ${MAIN_SRC_DIR} CACHE PATH "Path to LLVM source tree")
 
   # Make use of LLVM CMake modules.
   file(TO_CMAKE_PATH ${LLVM_BINARY_DIR} LLVM_BINARY_DIR_CMAKE_STYLE)