Index: libcxxabi/trunk/cmake/config-ix.cmake
===================================================================
--- libcxxabi/trunk/cmake/config-ix.cmake
+++ libcxxabi/trunk/cmake/config-ix.cmake
@@ -30,9 +30,14 @@
   if (MINGW)
     # Mingw64 requires quite a few "C" runtime libraries in order for basic
     # programs to link successfully with -nodefaultlibs.
-    set(MINGW_LIBRARIES mingw32 gcc_s gcc moldname mingwex msvcrt advapi32
-                        shell32 user32 kernel32 iconv mingw32 gcc_s gcc moldname
-                        mingwex msvcrt)
+    if (LIBCXXABI_USE_COMPILER_RT)
+      set(MINGW_RUNTIME ${LIBCXXABI_BUILTINS_LIBRARY})
+    else ()
+      set(MINGW_RUNTIME gcc_s gcc)
+    endif()
+    set(MINGW_LIBRARIES mingw32 ${MINGW_RUNTIME} moldname mingwex msvcrt advapi32
+                        shell32 user32 kernel32 iconv mingw32 ${MINGW_RUNTIME}
+                        moldname mingwex msvcrt)
     list(APPEND CMAKE_REQUIRED_LIBRARIES ${MINGW_LIBRARIES})
   endif()
   if (CMAKE_C_FLAGS MATCHES -fsanitize OR CMAKE_CXX_FLAGS MATCHES -fsanitize)