Index: CMakeLists.txt
===================================================================
--- CMakeLists.txt
+++ CMakeLists.txt
@@ -368,6 +368,8 @@
 append_list_if(COMPILER_RT_HAS_WD4722_FLAG /wd4722 SANITIZER_COMMON_CFLAGS)
 append_list_if(COMPILER_RT_HAS_WD4800_FLAG /wd4800 SANITIZER_COMMON_CFLAGS)
 
+append_list_if(MINGW -fms-extensions SANITIZER_COMMON_CFLAGS)
+
 # Set common link flags.
 append_list_if(COMPILER_RT_HAS_NODEFAULTLIBS_FLAG -nodefaultlibs SANITIZER_COMMON_LINK_FLAGS)
 
Index: cmake/config-ix.cmake
===================================================================
--- cmake/config-ix.cmake
+++ cmake/config-ix.cmake
@@ -37,6 +37,19 @@
   elseif (COMPILER_RT_HAS_GCC_LIB)
     list(APPEND CMAKE_REQUIRED_LIBRARIES gcc)
   endif ()
+  if (MINGW)
+    # Mingw64 requires quite a few "C" runtime libraries in order for basic
+    # programs to link successfully with -nodefaultlibs.
+    if (COMPILER_RT_USE_BUILTINS_LIBRARY)
+      set(MINGW_RUNTIME ${COMPILER_RT_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})
+  endif()
 endif ()
 
 # CodeGen options.
@@ -514,7 +527,8 @@
 
 if (SANITIZER_COMMON_SUPPORTED_ARCH AND NOT LLVM_USE_SANITIZER AND
     (OS_NAME MATCHES "Android|Darwin|Linux|FreeBSD|NetBSD|OpenBSD|Fuchsia|SunOS" OR
-    (OS_NAME MATCHES "Windows" AND (NOT MINGW AND NOT CYGWIN))))
+    (OS_NAME MATCHES "Windows" AND NOT CYGWIN AND
+        (NOT MINGW OR CMAKE_CXX_COMPILER_ID MATCHES "Clang"))))
   set(COMPILER_RT_HAS_SANITIZER_COMMON TRUE)
 else()
   set(COMPILER_RT_HAS_SANITIZER_COMMON FALSE)
Index: lib/asan/CMakeLists.txt
===================================================================
--- lib/asan/CMakeLists.txt
+++ lib/asan/CMakeLists.txt
@@ -91,6 +91,8 @@
 append_list_if(COMPILER_RT_HAS_LIBM m ASAN_DYNAMIC_LIBS)
 append_list_if(COMPILER_RT_HAS_LIBPTHREAD pthread ASAN_DYNAMIC_LIBS)
 append_list_if(COMPILER_RT_HAS_LIBLOG log ASAN_DYNAMIC_LIBS)
+append_list_if(MINGW "${MINGW_LIBRARIES}" ASAN_DYNAMIC_LIBS)
+append_list_if(MINGW psapi ASAN_DYNAMIC_LIBS)
 
 # Compile ASan sources into an object library.
 
@@ -216,7 +218,7 @@
     endif()
 
     set(ASAN_DYNAMIC_WEAK_INTERCEPTION)
-    if (MSVC)
+    if (WIN32)
       add_compiler_rt_object_libraries(AsanWeakInterception
         ${SANITIZER_COMMON_SUPPORTED_OS}
         ARCHS ${arch}