Index: libcxx/trunk/cmake/config-ix.cmake
===================================================================
--- libcxx/trunk/cmake/config-ix.cmake
+++ libcxx/trunk/cmake/config-ix.cmake
@@ -41,7 +41,16 @@
   if (MINGW)
     # Mingw64 requires quite a few "C" runtime libraries in order for basic
     # programs to link successfully with -nodefaultlibs.
-    list(APPEND CMAKE_REQUIRED_LIBRARIES mingw32 gcc gcc_eh mingwex msvcrt gcc)
+    if (LIBCXX_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 mingw32 ${MINGW_RUNTIME}
+                        moldname mingwex msvcrt)
+    list(APPEND CMAKE_REQUIRED_LIBRARIES ${MINGW_LIBRARIES})
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -D_WIN32_WINNT=0x0600")
   endif()
   if (CMAKE_C_FLAGS MATCHES -fsanitize OR CMAKE_CXX_FLAGS MATCHES -fsanitize)
     set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -fno-sanitize=all")
Index: libcxx/trunk/include/__threading_support
===================================================================
--- libcxx/trunk/include/__threading_support
+++ libcxx/trunk/include/__threading_support
@@ -27,7 +27,7 @@
 # include <pthread.h>
 # include <sched.h>
 #elif defined(_LIBCPP_HAS_THREAD_API_WIN32)
-#include <Windows.h>
+#include <windows.h>
 #include <process.h>
 #include <fibersapi.h>
 #include <__undef_min_max>
Index: libcxx/trunk/lib/CMakeLists.txt
===================================================================
--- libcxx/trunk/lib/CMakeLists.txt
+++ libcxx/trunk/lib/CMakeLists.txt
@@ -243,7 +243,7 @@
   add_library(cxx_static STATIC $<TARGET_OBJECTS:cxx_objects>)
   target_link_libraries(cxx_static ${LIBCXX_LIBRARIES})
   set(STATIC_OUTPUT_NAME "c++")
-  if (WIN32)
+  if (WIN32 AND NOT MINGW)
     set(STATIC_OUTPUT_NAME "libc++")
   endif()
   set_target_properties(cxx_static