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diff --git a/clang/runtime/compiler-rt/Makefile b/clang/runtime/compiler-rt/Makefile
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+##===- clang/runtime/compiler-rt/Makefile ------------------*- Makefile -*-===##
+#
+#                     The LLVM Compiler Infrastructure
+#
+# This file is distributed under the University of Illinois Open Source
+# License. See LICENSE.TXT for details.
+#
+##===----------------------------------------------------------------------===##
+#
+# This file defines support for building the Clang runtime libraries (which are
+# implemented by compiler-rt) and placing them in the proper locations in the
+# Clang resources directory (i.e., where the driver expects them).
+#
+##===----------------------------------------------------------------------===##
+
+CLANG_LEVEL := ../..
+include $(CLANG_LEVEL)/Makefile
+
+CLANG_VERSION := $(word 3,$(shell grep "CLANG_VERSION " \
+	$(PROJ_OBJ_DIR)/$(CLANG_LEVEL)/include/clang/Basic/Version.inc))
+
+ResourceDir := $(PROJ_OBJ_ROOT)/$(BuildMode)/lib/clang/$(CLANG_VERSION)
+PROJ_resources := $(DESTDIR)$(PROJ_prefix)/lib/clang/$(CLANG_VERSION)
+
+ResourceLibDir := $(ResourceDir)/lib
+PROJ_resources_lib := $(PROJ_resources)/lib
+
+# Expect compiler-rt to be in llvm/projects/compiler-rt
+COMPILERRT_SRC_ROOT := $(LLVM_SRC_ROOT)/projects/compiler-rt
+
+# We don't currently support building runtime libraries when we are
+# cross-compiling. The issue is that we really want to be set up so that the
+# available compiler targets are independent of the current build.
+#
+# Since we have to build the runtime libraries for the target, it requires we
+# have a cross compiler from the build machine to the target. Although in the
+# case where for the current build (host == target), we do have such a cross
+# compiler, but not defined in a way that is easy for us to reuse. Regardless,
+# that also wouldn't help for other possible compiler configurations.
+#
+# Thus, the simple set up we currently use is to assume that we will be using
+# the just built Clang to compile the compiler-rt libraries. As we grow better
+# cross compilation support inside Clang and tool support in LLVM, this makes it
+# easier for us to achieve the goal of having the compiler targets be easily
+# selected at configure time. However, this design does currently preclude the
+# building of compiler-rt libraries when the Clang itself is being cross
+# compiled.
+#
+# There are three possible solutions:
+#  1. Require building a build-target version of Clang when cross compiling. This
+#     is simplest, but als greatly increases the build time of cross builds.
+#
+#  2. Require cross builds have a build-target version of Clang available for
+#     use. This is a reasonable compromise on #1, as the compiler-rt libraries
+#     are simple enough that there is not a strong desire to ensure they are
+#     built with the exact version of Clang being used. Similarly, as Clang
+#     becomes a better cross compiler it is also increasingly more likely that
+#     the cross compiler being used will already be a version of Clang.
+#
+#  3. Come up with an alternate mechanism to define all the toolchain
+#     information that compiler-rt would need to build libraries for all the
+#     requested targets. This might be a simple short term solution, but is
+#     likely to be unwieldly and irritating to maintain in the long term.
+ifneq ($(LLVM_CROSS_COMPILING),1)
+ifneq ($(CLANG_NO_RUNTIME),1)
+ifeq ($(shell test -d $(COMPILERRT_SRC_ROOT) && echo OK),OK)
+
+# Select the compiler-rt configuration to use, and install directory.
+#
+# FIXME: Eventually, we want some kind of configure support for this. We want to
+# build/install runtime libraries for as many targets as clang was configured to
+# support.
+RuntimeDirs :=
+ifeq ($(OS),Darwin)
+RuntimeDirs += darwin
+RuntimeLibrary.darwin.Configs := \
+	eprintf 10.4 osx ios cc_kext \
+	asan_osx profile_osx profile_ios
+endif
+
+# On Linux, include a library which has all the runtime functions.
+ifeq ($(OS),Linux)
+RuntimeDirs += linux
+RuntimeLibrary.linux.Configs :=
+
+# We currently only try to generate runtime libraries on x86.
+ifeq ($(ARCH),x86)
+RuntimeLibrary.linux.Configs += \
+	full-i386 profile-i386 asan-i386
+endif
+ifeq ($(ARCH),x86_64)
+RuntimeLibrary.linux.Configs += \
+	full-x86_64 profile-x86_64 asan-x86_64
+endif
+
+endif
+
+####
+# The build rules below are designed to be generic and should only need to be
+# modified based on changes in the compiler-rt layout or build system.
+####
+
+# Rule to build the compiler-rt libraries we need.
+#
+# We build all the libraries in a single shot to avoid recursive make as much as
+# possible.
+BuildRuntimeLibraries:
+	$(Verb) $(MAKE) -C $(COMPILERRT_SRC_ROOT) \
+	  ProjSrcRoot=$(COMPILERRT_SRC_ROOT) \
+	  ProjObjRoot=$(PROJ_OBJ_DIR) \
+	  CC="$(ToolDir)/clang" \
+	  $(RuntimeDirs:%=clang_%)
+.PHONY: BuildRuntimeLibraries
+CleanRuntimeLibraries:
+	$(Verb) $(MAKE) -C $(COMPILERRT_SRC_ROOT) \
+	  ProjSrcRoot=$(COMPILERRT_SRC_ROOT) \
+	  ProjObjRoot=$(PROJ_OBJ_DIR) \
+	  clean
+.PHONY: CleanRuntimeLibraries
+
+$(PROJ_resources_lib):
+	$(Verb) $(MKDIR) $@
+
+# Expand rules for copying/installing each individual library. We can't use
+# implicit rules here because we need to match against multiple things.
+define RuntimeLibraryTemplate
+$(PROJ_OBJ_DIR)/clang_$1/%/libcompiler_rt.a: BuildRuntimeLibraries
+	@true
+.PRECIOUS: $(PROJ_OBJ_DIR)/clang_$1/%/libcompiler_rt.a
+
+# Rule to copy the libraries to their resource directory location.
+$(ResourceLibDir)/$1/libclang_rt.%.a: \
+		$(PROJ_OBJ_DIR)/clang_$1/%/libcompiler_rt.a \
+		$(ResourceLibDir)/$1/.dir
+	$(Echo) Copying runtime library $1/$$* to build dir
+	$(Verb) cp $(PROJ_OBJ_DIR)/clang_$1/$$*/libcompiler_rt.a $$@
+RuntimeLibrary.$1: \
+		$(RuntimeLibrary.$1.Configs:%=$(ResourceLibDir)/$1/libclang_rt.%.a)
+.PHONY: RuntimeLibrary.$1
+
+$(PROJ_resources_lib)/$1: $(PROJ_resources_lib)
+	$(Verb) $(MKDIR) $$@
+
+$(PROJ_resources_lib)/$1/libclang_rt.%.a: \
+		$(ResourceLibDir)/$1/libclang_rt.%.a | $(PROJ_resources_lib)/$1
+	$(Echo) Installing compiler runtime library: $1/$$*
+	$(Verb) $(DataInstall) $$< $(PROJ_resources_lib)/$1
+
+# Rule to install runtime libraries.
+RuntimeLibraryInstall.$1: \
+		$(RuntimeLibrary.$1.Configs:%=$(PROJ_resources_lib)/$1/libclang_rt.%.a)
+.PHONY: RuntimeLibraryInstall.$1
+endef
+$(foreach lib,$(RuntimeDirs), $(eval $(call RuntimeLibraryTemplate,$(lib))))
+
+# Hook into the standard Makefile rules.
+all-local:: $(RuntimeDirs:%=RuntimeLibrary.%)
+install-local:: $(RuntimeDirs:%=RuntimeLibraryInstall.%)
+clean-local:: CleanRuntimeLibraries
+
+endif
+endif
+endif