diff --git a/core/clear_vars.mk b/core/clear_vars.mk
index 682656b..1dd5cfe 100644
--- a/core/clear_vars.mk
+++ b/core/clear_vars.mk
@@ -118,7 +118,7 @@
 LOCAL_RENDERSCRIPT_TARGET_API:=
 LOCAL_BUILD_HOST_DEX:=
 LOCAL_DEX_PREOPT:= # '',true,false,nostripping
-LOCAL_DEX_PREOPT_IMAGE:=
+LOCAL_DEX_PREOPT_IMAGE_LOCATION:=
 LOCAL_PROTOC_OPTIMIZE_TYPE:= # lite(default),micro,nano,full
 LOCAL_PROTOC_FLAGS:=
 LOCAL_PROTO_JAVA_OUTPUT_PARAMS:=
diff --git a/core/config.mk b/core/config.mk
index 287944e..1c2db34 100644
--- a/core/config.mk
+++ b/core/config.mk
@@ -528,22 +528,19 @@
 DEX2OAT_TARGET_ARCH := $(TARGET_ARCH)
 DEX2OAT_TARGET_CPU_VARIANT := $(TARGET_CPU_VARIANT)
 DEX2OAT_TARGET_INSTRUCTION_SET_FEATURES := default
-
-# If for a 64bit build we have a 2nd architecture but the zygote isn't 64bit,
-# assume DEX2OAT should DEXPREOPT for the 2nd architecture.
-ifdef TARGET_2ND_ARCH
-  ifeq (true,$(TARGET_IS_64_BIT))
-    ifeq ($(filter ro.zygote=zygote64,$(PRODUCT_DEFAULT_PROPERTY_OVERRIDES)),)
-      DEX2OAT_TARGET_ARCH := $(TARGET_2ND_ARCH)
-      DEX2OAT_TARGET_CPU_VARIANT := $(TARGET_2ND_CPU_VARIANT)
-    endif
-  endif
-endif
-
 ifneq (,$(filter $(DEX2OAT_TARGET_CPU_VARIANT),cortex-a7 cortex-a15 krait denver))
   DEX2OAT_TARGET_INSTRUCTION_SET_FEATURES := div
 endif
 
+ifdef TARGET_2ND_ARCH
+$(TARGET_2ND_ARCH_VAR_PREFIX)DEX2OAT_TARGET_ARCH := $(TARGET_2ND_ARCH)
+$(TARGET_2ND_ARCH_VAR_PREFIX)DEX2OAT_TARGET_CPU_VARIANT := $(TARGET_2ND_CPU_VARIANT)
+$(TARGET_2ND_ARCH_VAR_PREFIX)DEX2OAT_TARGET_INSTRUCTION_SET_FEATURES := default
+ifneq (,$(filter $($(TARGET_2ND_ARCH_VAR_PREFIX)DEX2OAT_TARGET_CPU_VARIANT),cortex-a7 cortex-a15 krait denver))
+  $(TARGET_2ND_ARCH_VAR_PREFIX)DEX2OAT_TARGET_INSTRUCTION_SET_FEATURES := div
+endif
+endif
+
 # define clang/llvm tools and global flags
 include $(BUILD_SYSTEM)/clang/config.mk
 
diff --git a/core/dex_preopt.mk b/core/dex_preopt.mk
index 46a6479..ab970f9 100644
--- a/core/dex_preopt.mk
+++ b/core/dex_preopt.mk
@@ -49,25 +49,26 @@
 include $(BUILD_SYSTEM)/dex_preopt_libart.mk
 
 # Define dexpreopt-one-file based on current default runtime.
-# $(1): the boot image to use (unused for libdvm)
-# $(2): the input .jar or .apk file
-# $(3): the input .jar or .apk target location (unused for libdvm)
-# $(4): the output .odex file
+# $(1): the input .jar or .apk file
+# $(2): the output .odex file
 ifeq ($(DALVIK_VM_LIB),libdvm.so)
 define dexpreopt-one-file
-$(call dexopt-one-file,$(2),$(4))
+$(call dexopt-one-file,$(1),$(2))
 endef
 
 DEXPREOPT_ONE_FILE_DEPENDENCY_TOOLS := $(DEXOPT_DEPENDENCY)
 DEXPREOPT_ONE_FILE_DEPENDENCY_BUILT_BOOT_PREOPT := $(DEXPREOPT_BOOT_ODEXS)
 else
 define dexpreopt-one-file
-$(call dex2oat-one-file,$(1),$(2),$(3),$(4))
+$(call dex2oat-one-file,$(1),$(2))
 endef
 
 DEXPREOPT_ONE_FILE_DEPENDENCY_TOOLS := $(DEX2OATD_DEPENDENCY)
-DEXPREOPT_ONE_FILE_DEPENDENCY_BUILT_BOOT_PREOPT := $(DEFAULT_DEX_PREOPT_BUILT_IMAGE)
-endif
+DEXPREOPT_ONE_FILE_DEPENDENCY_BUILT_BOOT_PREOPT := $(DEFAULT_DEX_PREOPT_BUILT_IMAGE_FILENAME)
+ifdef TARGET_2ND_ARCH
+$(TARGET_2ND_ARCH_VAR_PREFIX)DEXPREOPT_ONE_FILE_DEPENDENCY_BUILT_BOOT_PREOPT := $($(TARGET_2ND_ARCH_VAR_PREFIX)DEFAULT_DEX_PREOPT_BUILT_IMAGE_FILENAME)
+endif  # TARGET_2ND_ARCH
+endif  # DALVIK_VM_LIB
 else
 $(warning No DALVIK_VM_LIB, disable dexpreopt.)
 WITH_DEXPREOPT := false
diff --git a/core/dex_preopt_libart.mk b/core/dex_preopt_libart.mk
index 7f3285c..7d8cee0 100644
--- a/core/dex_preopt_libart.mk
+++ b/core/dex_preopt_libart.mk
@@ -23,20 +23,6 @@
 
 PRELOADED_CLASSES := frameworks/base/preloaded-classes
 
-LIBART_BOOT_IMAGE := /$(DEXPREOPT_BOOT_JAR_DIR)/boot-$(DEX2OAT_TARGET_ARCH).art
-
-DEFAULT_DEX_PREOPT_BUILT_IMAGE := $(DEXPREOPT_BOOT_JAR_DIR_FULL_PATH)/boot-$(DEX2OAT_TARGET_ARCH).art
-
-DEFAULT_DEX_PREOPT_INSTALLED_IMAGE :=
-ifneq ($(PRODUCT_DEX_PREOPT_IMAGE_IN_DATA),true)
-DEFAULT_DEX_PREOPT_INSTALLED_IMAGE := $(PRODUCT_OUT)$(LIBART_BOOT_IMAGE)
-
-# The rule to install boot.art and boot.oat
-$(DEFAULT_DEX_PREOPT_INSTALLED_IMAGE) : $(DEFAULT_DEX_PREOPT_BUILT_IMAGE) | $(ACP)
-	$(call copy-file-to-target)
-	$(hide) $(ACP) -fp $(patsubst %.art,%.oat,$<) $(patsubst %.art,%.oat,$@)
-endif
-
 # start of image reserved address space
 LIBART_IMG_HOST_BASE_ADDRESS   := 0x60000000
 
@@ -49,48 +35,50 @@
 ########################################################################
 # The full system boot classpath
 
+# Returns the path to the .odex file
+# $(1): the arch name.
+# $(2): the full path (including file name) of the corresponding .jar or .apk.
+define get-odex-file-path
+$(dir $(2))$(1)/$(basename $(notdir $(2))).odex
+endef
+
+# Returns the path to the image file (such as "/system/framework/<arch>/boot.art"
+# $(1): the arch name (such as "arm")
+# $(2): the image location (such as "/system/framework/boot.art")
+define get-image-file-path
+$(dir $(2))$(1)/$(notdir $(2))
+endef
+
 # note we use core-libart.jar in place of core.jar for ART.
 LIBART_TARGET_BOOT_JARS := $(patsubst core, core-libart,$(DEXPREOPT_BOOT_JARS_MODULES))
 LIBART_TARGET_BOOT_DEX_LOCATIONS := $(foreach jar,$(LIBART_TARGET_BOOT_JARS),/$(DEXPREOPT_BOOT_JAR_DIR)/$(jar).jar)
 LIBART_TARGET_BOOT_DEX_FILES := $(foreach jar,$(LIBART_TARGET_BOOT_JARS),$(call intermediates-dir-for,JAVA_LIBRARIES,$(jar),,COMMON)/javalib.jar)
 
-# The .oat with symbols
-LIBART_TARGET_BOOT_OAT_UNSTRIPPED := $(TARGET_OUT_UNSTRIPPED)$(patsubst %.art,%.oat,$(LIBART_BOOT_IMAGE))
+my_2nd_arch_prefix :=
+include $(BUILD_SYSTEM)/dex_preopt_libart_boot.mk
 
-# Use dex2oat debug version for better error reporting
-$(DEFAULT_DEX_PREOPT_BUILT_IMAGE): $(LIBART_TARGET_BOOT_DEX_FILES) $(DEX2OATD_DEPENDENCY)
-	@echo "target dex2oat: $@ ($?)"
-	@mkdir -p $(dir $@)
-	@mkdir -p $(dir $(LIBART_TARGET_BOOT_OAT_UNSTRIPPED))
-	$(hide) $(DEX2OATD) --runtime-arg -Xms256m --runtime-arg -Xmx256m --image-classes=$(PRELOADED_CLASSES) \
-		$(addprefix --dex-file=,$(LIBART_TARGET_BOOT_DEX_FILES)) \
-		$(addprefix --dex-location=,$(LIBART_TARGET_BOOT_DEX_LOCATIONS)) \
-		--oat-symbols=$(LIBART_TARGET_BOOT_OAT_UNSTRIPPED) \
-		--oat-file=$(patsubst %.art,%.oat,$@) \
-		--oat-location=$(patsubst %.art,%.oat,$(LIBART_BOOT_IMAGE)) \
-		--image=$@ --base=$(LIBART_IMG_TARGET_BASE_ADDRESS) \
-		--instruction-set=$(DEX2OAT_TARGET_ARCH) \
-		--instruction-set-features=$(DEX2OAT_TARGET_INSTRUCTION_SET_FEATURES) \
-		--android-root=$(PRODUCT_OUT)/system
+ifdef TARGET_2ND_ARCH
+my_2nd_arch_prefix := $(TARGET_2ND_ARCH_VAR_PREFIX)
+include $(BUILD_SYSTEM)/dex_preopt_libart_boot.mk
+my_2nd_arch_prefix :=
+endif
 
 
 ########################################################################
 # For a single jar or APK
 
-# $(1): the boot image to use
-# $(2): the input .jar or .apk file
-# $(3): the input .jar or .apk target location
-# $(4): the output .odex file
+# $(1): the input .jar or .apk file
+# $(2): the output .odex file
 define dex2oat-one-file
-$(hide) rm -f $(4)
-$(hide) mkdir -p $(dir $(4))
+$(hide) rm -f $(2)
+$(hide) mkdir -p $(dir $(2))
 $(hide) $(DEX2OATD) \
 	--runtime-arg -Xms64m --runtime-arg -Xmx64m \
-	--boot-image=$(1) \
-	--dex-file=$(2) \
-	--dex-location=$(3) \
-	--oat-file=$(4) \
+	--boot-image=$(PRIVATE_DEX_PREOPT_IMAGE_LOCATION) \
+	--dex-file=$(1) \
+	--dex-location=$(PRIVATE_DEX_LOCATION) \
+	--oat-file=$(2) \
 	--android-root=$(PRODUCT_OUT)/system \
-	--instruction-set=$(DEX2OAT_TARGET_ARCH) \
-	--instruction-set-features=$(DEX2OAT_TARGET_INSTRUCTION_SET_FEATURES)
+	--instruction-set=$($(PRIVATE_2ND_ARCH_VAR_PREFIX)DEX2OAT_TARGET_ARCH) \
+	--instruction-set-features=$($(PRIVATE_2ND_ARCH_VAR_PREFIX)DEX2OAT_TARGET_INSTRUCTION_SET_FEATURES)
 endef
diff --git a/core/dex_preopt_libart_boot.mk b/core/dex_preopt_libart_boot.mk
new file mode 100644
index 0000000..70130b6
--- /dev/null
+++ b/core/dex_preopt_libart_boot.mk
@@ -0,0 +1,55 @@
+# Rules to build boot.art
+# Input variables:
+#   my_2nd_arch_prefix: indicates if this is to build for the 2nd arch.
+
+# The image "location" is a symbolic path that with multiarchitecture
+# support doesn't really exist on the device. Typically it is
+# /system/framework/boot.art and should be the same for all supported
+# architectures on the device. The concrete architecture specific
+# content actually ends up in a "filename" that contains an
+# architecture specific directory name such as arm, arm64, mips,
+# mips64, x86, x86_64.
+#
+# Here are some example values for an x86_64 / x86 configuration:
+#
+# DEFAULT_DEX_PREOPT_BUILT_IMAGE_LOCATION=out/target/product/generic_x86_64/dex_bootjars/system/framework/boot.art
+# DEFAULT_DEX_PREOPT_BUILT_IMAGE_FILENAME=out/target/product/generic_x86_64/dex_bootjars/system/framework/x86_64/boot.art
+# LIBART_BOOT_IMAGE=/system/framework/x86_64/boot.art
+#
+# 2ND_DEFAULT_DEX_PREOPT_BUILT_IMAGE_LOCATION=out/target/product/generic_x86_64/dex_bootjars/system/framework/boot.art
+# 2ND_DEFAULT_DEX_PREOPT_BUILT_IMAGE_FILENAME=out/target/product/generic_x86_64/dex_bootjars/system/framework/x86/boot.art
+# 2ND_LIBART_BOOT_IMAGE=/system/framework/x86/boot.art
+
+$(my_2nd_arch_prefix)DEFAULT_DEX_PREOPT_BUILT_IMAGE_LOCATION := $(DEXPREOPT_BOOT_JAR_DIR_FULL_PATH)/boot.art
+$(my_2nd_arch_prefix)DEFAULT_DEX_PREOPT_BUILT_IMAGE_FILENAME := $(DEXPREOPT_BOOT_JAR_DIR_FULL_PATH)/$($(my_2nd_arch_prefix)DEX2OAT_TARGET_ARCH)/boot.art
+$(my_2nd_arch_prefix)LIBART_BOOT_IMAGE_FILENAME := /$(DEXPREOPT_BOOT_JAR_DIR)/$($(my_2nd_arch_prefix)DEX2OAT_TARGET_ARCH)/boot.art
+
+# The .oat with symbols
+$(my_2nd_arch_prefix)LIBART_TARGET_BOOT_OAT_UNSTRIPPED := $(TARGET_OUT_UNSTRIPPED)$(patsubst %.art,%.oat,$($(my_2nd_arch_prefix)LIBART_BOOT_IMAGE_FILENAME))
+
+$(my_2nd_arch_prefix)DEFAULT_DEX_PREOPT_INSTALLED_IMAGE :=
+ifneq ($(PRODUCT_DEX_PREOPT_IMAGE_IN_DATA),true)
+$(my_2nd_arch_prefix)DEFAULT_DEX_PREOPT_INSTALLED_IMAGE := $(PRODUCT_OUT)$($(my_2nd_arch_prefix)LIBART_BOOT_IMAGE_FILENAME)
+endif
+
+# The rule to install boot.art and boot.oat
+$($(my_2nd_arch_prefix)DEFAULT_DEX_PREOPT_INSTALLED_IMAGE) : $($(my_2nd_arch_prefix)DEFAULT_DEX_PREOPT_BUILT_IMAGE_FILENAME) | $(ACP)
+	$(call copy-file-to-target)
+	$(hide) $(ACP) -fp $(patsubst %.art,%.oat,$<) $(patsubst %.art,%.oat,$@)
+
+$($(my_2nd_arch_prefix)DEFAULT_DEX_PREOPT_BUILT_IMAGE_FILENAME): PRIVATE_2ND_ARCH_VAR_PREFIX := $(my_2nd_arch_prefix)
+# Use dex2oat debug version for better error reporting
+$($(my_2nd_arch_prefix)DEFAULT_DEX_PREOPT_BUILT_IMAGE_FILENAME) : $(LIBART_TARGET_BOOT_DEX_FILES) $(DEX2OATD_DEPENDENCY)
+	@echo "target dex2oat: $@ ($?)"
+	@mkdir -p $(dir $@)
+	@mkdir -p $(dir $($(PRIVATE_2ND_ARCH_VAR_PREFIX)LIBART_TARGET_BOOT_OAT_UNSTRIPPED))
+	$(hide) $(DEX2OATD) --runtime-arg -Xms256m --runtime-arg -Xmx256m --image-classes=$(PRELOADED_CLASSES) \
+		$(addprefix --dex-file=,$(LIBART_TARGET_BOOT_DEX_FILES)) \
+		$(addprefix --dex-location=,$(LIBART_TARGET_BOOT_DEX_LOCATIONS)) \
+		--oat-symbols=$($(PRIVATE_2ND_ARCH_VAR_PREFIX)LIBART_TARGET_BOOT_OAT_UNSTRIPPED) \
+		--oat-file=$(patsubst %.art,%.oat,$@) \
+		--oat-location=$(patsubst %.art,%.oat,$($(PRIVATE_2ND_ARCH_VAR_PREFIX)LIBART_BOOT_IMAGE_FILENAME)) \
+		--image=$@ --base=$(LIBART_IMG_TARGET_BASE_ADDRESS) \
+		--instruction-set=$($(PRIVATE_2ND_ARCH_VAR_PREFIX)DEX2OAT_TARGET_ARCH) \
+		--instruction-set-features=$($(PRIVATE_2ND_ARCH_VAR_PREFIX)DEX2OAT_TARGET_INSTRUCTION_SET_FEATURES) \
+		--android-root=$(PRODUCT_OUT)/system
diff --git a/core/dex_preopt_odex_install.mk b/core/dex_preopt_odex_install.mk
index b0b73af..6d70dde 100644
--- a/core/dex_preopt_odex_install.mk
+++ b/core/dex_preopt_odex_install.mk
@@ -43,22 +43,86 @@
 # For libart, the boot jars' odex files are replaced by $(DEFAULT_DEX_PREOPT_INSTALLED_IMAGE).
 # We use this installed_odex trick to get boot.art installed.
 installed_odex := $(DEFAULT_DEX_PREOPT_INSTALLED_IMAGE)
+# Append the odex for the 2nd arch if we have one.
+installed_odex += $($(TARGET_2ND_ARCH_VAR_PREFIX)DEFAULT_DEX_PREOPT_INSTALLED_IMAGE)
 endif # libdvm.so
 else  # boot jar
+ifeq ($(DALVIK_VM_LIB),libdvm.so)
 built_odex := $(basename $(LOCAL_BUILT_MODULE)).odex
 installed_odex := $(basename $(LOCAL_INSTALLED_MODULE)).odex
 
-ifneq ($(DALVIK_VM_LIB),libdvm.so) # libart
-ifndef LOCAL_DEX_PREOPT_IMAGE
-LOCAL_DEX_PREOPT_IMAGE := $(DEFAULT_DEX_PREOPT_BUILT_IMAGE)
+$(built_odex) : $(DEXPREOPT_ONE_FILE_DEPENDENCY_BUILT_BOOT_PREOPT) \
+                $(DEXPREOPT_ONE_FILE_DEPENDENCY_TOOLS)
+else # libart
+ifeq ($(LOCAL_MODULE_CLASS),JAVA_LIBRARIES)
+# For a Java library, we build odex for both 1st arch and 2nd arch, if we have one.
+# #################################################
+# Odex for the 1st arch
+built_odex := $(call get-odex-file-path,$(DEX2OAT_TARGET_ARCH),$(LOCAL_BUILT_MODULE))
+ifdef LOCAL_DEX_PREOPT_IMAGE_LOCATION
+my_dex_preopt_image_location := $(LOCAL_DEX_PREOPT_IMAGE_LOCATION)
+else
+my_dex_preopt_image_location := $(DEFAULT_DEX_PREOPT_BUILT_IMAGE_LOCATION)
 endif
+my_dex_preopt_image_filename := $(call get-image-file-path,$(DEX2OAT_TARGET_ARCH),$(my_dex_preopt_image_location))
+$(built_odex): PRIVATE_2ND_ARCH_VAR_PREFIX :=
+$(built_odex): PRIVATE_DEX_LOCATION := $(patsubst $(PRODUCT_OUT)%,%,$(LOCAL_INSTALLED_MODULE))
+$(built_odex): PRIVATE_DEX_PREOPT_IMAGE_LOCATION := $(my_dex_preopt_image_location)
+$(built_odex) : $(DEXPREOPT_ONE_FILE_DEPENDENCY_BUILT_BOOT_PREOPT) \
+                $(DEXPREOPT_ONE_FILE_DEPENDENCY_TOOLS) \
+                $(my_dex_preopt_image_filename)
+installed_odex := $(call get-odex-file-path,$(DEX2OAT_TARGET_ARCH),$(LOCAL_INSTALLED_MODULE))
+
+# #################################################
+# Odex for the 2nd arch
+ifdef TARGET_2ND_ARCH
+built_odex2 := $(call get-odex-file-path,$($(TARGET_2ND_ARCH_VAR_PREFIX)DEX2OAT_TARGET_ARCH),$(LOCAL_BUILT_MODULE))
+ifdef LOCAL_DEX_PREOPT_IMAGE_LOCATION
+my_dex_preopt_image_location := $(LOCAL_DEX_PREOPT_IMAGE_LOCATION)
+else
+my_dex_preopt_image_location := $($(TARGET_2ND_ARCH_VAR_PREFIX)DEFAULT_DEX_PREOPT_BUILT_IMAGE_LOCATION)
+endif
+my_dex_preopt_image_filename := $(call get-image-file-path,$($(TARGET_2ND_ARCH_VAR_PREFIX)DEX2OAT_TARGET_ARCH),$(my_dex_preopt_image_location))
+$(built_odex2): PRIVATE_2ND_ARCH_VAR_PREFIX := $(TARGET_2ND_ARCH_VAR_PREFIX)
+$(built_odex2): PRIVATE_DEX_LOCATION := $(patsubst $(PRODUCT_OUT)%,%,$(LOCAL_INSTALLED_MODULE))
+$(built_odex2): PRIVATE_DEX_PREOPT_IMAGE_LOCATION := $(my_dex_preopt_image_location)
+$(built_odex2) : $($(TARGET_2ND_ARCH_VAR_PREFIX)DEXPREOPT_ONE_FILE_DEPENDENCY_BUILT_BOOT_PREOPT) \
+                 $(DEXPREOPT_ONE_FILE_DEPENDENCY_TOOLS) \
+                 $(my_dex_preopt_image_filename)
+
+built_odex += $(built_odex2)
+installed_odex += $(call get-odex-file-path,$($(TARGET_2ND_ARCH_VAR_PREFIX)DEX2OAT_TARGET_ARCH),$(LOCAL_INSTALLED_MODULE))
+endif  # TARGET_2ND_ARCH
+# #################################################
+else  # must be APPS
+# For an app, we build for the multilib arch it's targeted for.
+built_odex := $(call get-odex-file-path,$($(LOCAL_2ND_ARCH_VAR_PREFIX)DEX2OAT_TARGET_ARCH),$(LOCAL_BUILT_MODULE))
+ifdef LOCAL_DEX_PREOPT_IMAGE_LOCATION
+my_dex_preopt_image_location := $(LOCAL_DEX_PREOPT_IMAGE_LOCATION)
+else
+my_dex_preopt_image_location := $($(LOCAL_2ND_ARCH_VAR_PREFIX)DEFAULT_DEX_PREOPT_BUILT_IMAGE_LOCATION)
+endif
+my_dex_preopt_image_filename := $(call get-image-file-path,$($(LOCAL_2ND_ARCH_VAR_PREFIX)DEX2OAT_TARGET_ARCH),$(my_dex_preopt_image_location))
+# $(built_odex) is byproduct of $(LOCAL_BUILT_MODULE)
+$(LOCAL_BUILT_MODULE) $(built_odex): PRIVATE_2ND_ARCH_VAR_PREFIX := $(LOCAL_2ND_ARCH_VAR_PREFIX)
+$(LOCAL_BUILT_MODULE) $(built_odex): PRIVATE_DEX_LOCATION := $(patsubst $(PRODUCT_OUT)%,%,$(LOCAL_INSTALLED_MODULE))
+$(LOCAL_BUILT_MODULE) $(built_odex): PRIVATE_DEX_PREOPT_IMAGE_LOCATION := $(my_dex_preopt_image_location)
+$(LOCAL_BUILT_MODULE) $(built_odex) : $($(LOCAL_2ND_ARCH_VAR_PREFIX)DEXPREOPT_ONE_FILE_DEPENDENCY_BUILT_BOOT_PREOPT) \
+                $(DEXPREOPT_ONE_FILE_DEPENDENCY_TOOLS) \
+                $(my_dex_preopt_image_filename)
+installed_odex := $(call get-odex-file-path,$($(LOCAL_2ND_ARCH_VAR_PREFIX)DEX2OAT_TARGET_ARCH),$(LOCAL_INSTALLED_MODULE))
+endif  # LOCAL_MODULE_CLASS
 endif # libart
 endif # boot jar
 
 ifdef built_odex
 # We need $(LOCAL_BUILT_MODULE) in the deps to enforce reinstallation
 # even if $(built_odex) is byproduct of $(LOCAL_BUILT_MODULE), such as in package.mk.
-$(installed_odex) : $(built_odex) $(LOCAL_BUILT_MODULE) | $(ACP)
+# Use pattern rule - we may have multiple installed odex files.
+# Ugly syntax - See the definition get-odex-file-path.
+$(installed_odex) : $(dir $(LOCAL_INSTALLED_MODULE))%/$(notdir $(word 1,$(installed_odex))) \
+                  : $(dir $(LOCAL_BUILT_MODULE))%/$(notdir $(word 1,$(built_odex))) \
+    $(LOCAL_BUILT_MODULE) | $(ACP)
 	@echo "Install: $@"
 	$(copy-file-to-target)
 endif
diff --git a/core/java_library.mk b/core/java_library.mk
index 343b27e..dffc7d9 100644
--- a/core/java_library.mk
+++ b/core/java_library.mk
@@ -93,15 +93,10 @@
 
 else # ! boot jar
 $(built_odex): PRIVATE_MODULE := $(LOCAL_MODULE)
-$(built_odex): PRIVATE_DEX_LOCATION := $(patsubst $(PRODUCT_OUT)%,%,$(LOCAL_INSTALLED_MODULE))
-$(built_odex): PRIVATE_DEX_PREOPT_IMAGE := $(LOCAL_DEX_PREOPT_IMAGE)
-# Make sure the boot jars get dex-preopt-ed first
-$(built_odex) : $(DEXPREOPT_ONE_FILE_DEPENDENCY_BUILT_BOOT_PREOPT)
-$(built_odex) : $(DEXPREOPT_ONE_FILE_DEPENDENCY_TOOLS)
-$(built_odex) : $(LOCAL_DEX_PREOPT_IMAGE)
-$(built_odex) : $(common_javalib.jar)
+# Use pattern rule - we may have multiple built odex files.
+$(built_odex) : $(dir $(LOCAL_BUILT_MODULE))% : $(common_javalib.jar)
 	@echo "Dexpreopt Jar: $(PRIVATE_MODULE) ($@)"
-	$(call dexpreopt-one-file,$(PRIVATE_DEX_PREOPT_IMAGE),$<,$(PRIVATE_DEX_LOCATION),$@)
+	$(call dexpreopt-one-file,$<,$@)
 
 $(LOCAL_BUILT_MODULE) : $(common_javalib.jar) | $(ACP)
 	$(call copy-file-to-target)
diff --git a/core/package_internal.mk b/core/package_internal.mk
index 768032e..f8d2f43 100644
--- a/core/package_internal.mk
+++ b/core/package_internal.mk
@@ -337,13 +337,7 @@
 # Define the rule to build the actual package.
 $(LOCAL_BUILT_MODULE): $(AAPT) | $(ZIPALIGN)
 ifdef LOCAL_DEX_PREOPT
-$(LOCAL_BUILT_MODULE): PRIVATE_DEX_LOCATION := $(patsubst $(PRODUCT_OUT)%,%,$(LOCAL_INSTALLED_MODULE))
 $(LOCAL_BUILT_MODULE): PRIVATE_BUILT_ODEX := $(built_odex)
-$(LOCAL_BUILT_MODULE): PRIVATE_DEX_PREOPT_IMAGE := $(LOCAL_DEX_PREOPT_IMAGE)
-# Make sure the boot jars get dexpreopt-ed first
-$(LOCAL_BUILT_MODULE) : $(DEXPREOPT_ONE_FILE_DEPENDENCY_BUILT_BOOT_PREOPT)
-$(LOCAL_BUILT_MODULE) : $(DEXPREOPT_ONE_FILE_DEPENDENCY_TOOLS)
-$(LOCAL_BUILT_MODULE) : $(LOCAL_DEX_PREOPT_IMAGE)
 
 # built_odex is byproduct of LOCAL_BUILT_MODULE without its own build recipe.
 $(built_odex) : $(LOCAL_BUILT_MODULE)
@@ -377,7 +371,7 @@
 endif
 	$(sign-package)
 ifdef LOCAL_DEX_PREOPT
-	$(call dexpreopt-one-file,$(PRIVATE_DEX_PREOPT_IMAGE),$@,$(PRIVATE_DEX_LOCATION),$(PRIVATE_BUILT_ODEX))
+	$(call dexpreopt-one-file,$@,$(PRIVATE_BUILT_ODEX))
 ifneq (nostripping,$(LOCAL_DEX_PREOPT))
 	$(call dexpreopt-remove-classes.dex,$@)
 endif
diff --git a/core/prebuilt_internal.mk b/core/prebuilt_internal.mk
index 089cc63..2445d0d 100644
--- a/core/prebuilt_internal.mk
+++ b/core/prebuilt_internal.mk
@@ -157,13 +157,7 @@
 include $(BUILD_SYSTEM)/dex_preopt_odex_install.mk
 #######################################
 ifdef LOCAL_DEX_PREOPT
-$(built_module): PRIVATE_DEX_PREOPT_IMAGE := $(LOCAL_DEX_PREOPT_IMAGE)
-$(built_module): PRIVATE_DEX_LOCATION := $(patsubst $(PRODUCT_OUT)%,%,$(LOCAL_INSTALLED_MODULE))
 $(built_module): PRIVATE_BUILT_ODEX := $(built_odex)
-# Make sure the boot jars get dexpreopt-ed first
-$(built_module) : $(DEXPREOPT_ONE_FILE_DEPENDENCY_BUILT_BOOT_PREOPT)
-$(built_module) : $(DEXPREOPT_ONE_FILE_DEPENDENCY_TOOLS)
-(built_module) : $(LOCAL_DEX_PREOPT_IMAGE)
 # built_odex is byproduct of LOCAL_BUILT_MODULE without its own build recipe.
 $(built_odex) : $(LOCAL_BUILT_MODULE)
 endif # LOCAL_DEX_PREOPT
@@ -174,7 +168,7 @@
 	$(sign-package)
 endif
 ifdef LOCAL_DEX_PREOPT
-	$(call dexpreopt-one-file,$(PRIVATE_DEX_PREOPT_IMAGE),$@,$(PRIVATE_DEX_LOCATION),$(PRIVATE_BUILT_ODEX))
+	$(call dexpreopt-one-file,$@,$(PRIVATE_BUILT_ODEX))
 endif
 	$(align-package)