Index: compiler-rt/trunk/make/platform/clang_mingw.mk
===================================================================
--- compiler-rt/trunk/make/platform/clang_mingw.mk
+++ compiler-rt/trunk/make/platform/clang_mingw.mk
@@ -0,0 +1,30 @@
+Description := Static runtime libraries for mingw-w64
+
+###
+
+CC ?= cc
+AR ?= ar
+
+Arch := unknown
+Configs :=
+
+SupportedArches := x86_64 i386 arm
+
+Configs += builtins-x86_64 builtins-i386 builtins-arm
+Arch.builtins-x86_64 := x86_64
+Arch.builtins-i386 := i386
+Arch.builtins-arm := arm
+
+###
+
+CFLAGS := -Wall -O3 -fomit-frame-pointer
+CFLAGS.builtins-x86_64 := -target x86_64-windows-gnu $(CFLAGS)
+CFLAGS.builtins-i386 := -target i686-windows-gnu $(CFLAGS)
+CFLAGS.builtins-arm := -target armv7-windows-gnu $(CFLAGS)
+
+FUNCTIONS.builtins-x86_64 := $(CommonFunctions) $(ArchFunctions.x86_64)
+FUNCTIONS.builtins-i386 := $(CommonFunctions) $(ArchFunctions.i386)
+FUNCTIONS.builtins-arm := $(CommonFunctions) $(ArchFunctions.arm)
+
+# Always use optimized variants.
+OPTIMIZED := 1