Index: compiler-rt/trunk/cmake/Modules/HandleCompilerRT.cmake
===================================================================
--- compiler-rt/trunk/cmake/Modules/HandleCompilerRT.cmake
+++ compiler-rt/trunk/cmake/Modules/HandleCompilerRT.cmake
@@ -4,6 +4,9 @@
   if (CMAKE_CXX_COMPILER_ID MATCHES Clang AND CMAKE_CXX_COMPILER_TARGET)
     list(APPEND CLANG_COMMAND "--target=${CMAKE_CXX_COMPILER_TARGET}")
   endif()
+  get_property(SANITIZER_CXX_FLAGS CACHE CMAKE_CXX_FLAGS PROPERTY VALUE)
+  string(REPLACE " " ";" SANITIZER_CXX_FLAGS "${SANITIZER_CXX_FLAGS}")
+  list(APPEND CLANG_COMMAND ${SANITIZER_CXX_FLAGS})
   execute_process(
       COMMAND ${CLANG_COMMAND}
       RESULT_VARIABLE HAD_ERROR
Index: libcxx/trunk/cmake/Modules/HandleCompilerRT.cmake
===================================================================
--- libcxx/trunk/cmake/Modules/HandleCompilerRT.cmake
+++ libcxx/trunk/cmake/Modules/HandleCompilerRT.cmake
@@ -8,6 +8,9 @@
   if (CMAKE_CXX_COMPILER_ID MATCHES Clang AND CMAKE_CXX_COMPILER_TARGET)
     list(APPEND CLANG_COMMAND "--target=${CMAKE_CXX_COMPILER_TARGET}")
   endif()
+  get_property(LIBCXX_CXX_FLAGS CACHE CMAKE_CXX_FLAGS PROPERTY VALUE)
+  string(REPLACE " " ";" LIBCXX_CXX_FLAGS "${LIBCXX_CXX_FLAGS}")
+  list(APPEND CLANG_COMMAND ${LIBCXX_CXX_FLAGS})
   execute_process(
       COMMAND ${CLANG_COMMAND}
       RESULT_VARIABLE HAD_ERROR
Index: libcxxabi/trunk/cmake/Modules/HandleCompilerRT.cmake
===================================================================
--- libcxxabi/trunk/cmake/Modules/HandleCompilerRT.cmake
+++ libcxxabi/trunk/cmake/Modules/HandleCompilerRT.cmake
@@ -8,6 +8,9 @@
   if (CMAKE_CXX_COMPILER_ID MATCHES Clang AND CMAKE_CXX_COMPILER_TARGET)
     list(APPEND CLANG_COMMAND "--target=${CMAKE_CXX_COMPILER_TARGET}")
   endif()
+  get_property(LIBCXXABI_CXX_FLAGS CACHE CMAKE_CXX_FLAGS PROPERTY VALUE)
+  string(REPLACE " " ";" LIBCXXABI_CXX_FLAGS "${LIBCXXABI_CXX_FLAGS}")
+  list(APPEND CLANG_COMMAND ${LIBCXXABI_CXX_FLAGS})
   execute_process(
       COMMAND ${CLANG_COMMAND}
       RESULT_VARIABLE HAD_ERROR
Index: libunwind/trunk/cmake/Modules/HandleCompilerRT.cmake
===================================================================
--- libunwind/trunk/cmake/Modules/HandleCompilerRT.cmake
+++ libunwind/trunk/cmake/Modules/HandleCompilerRT.cmake
@@ -8,6 +8,9 @@
   if (CMAKE_CXX_COMPILER_ID MATCHES Clang AND CMAKE_CXX_COMPILER_TARGET)
     list(APPEND CLANG_COMMAND "--target=${CMAKE_CXX_COMPILER_TARGET}")
   endif()
+  get_property(LIBUNWIND_CXX_FLAGS CACHE CMAKE_CXX_FLAGS PROPERTY VALUE)
+  string(REPLACE " " ";" LIBUNWIND_CXX_FLAGS "${LIBUNWIND_CXX_FLAGS}")
+  list(APPEND CLANG_COMMAND ${LIBUNWIND_CXX_FLAGS})
   execute_process(
       COMMAND ${CLANG_COMMAND}
       RESULT_VARIABLE HAD_ERROR