diff --git a/core/64_bit_blacklist.mk b/core/64_bit_blacklist.mk
index 5ad7b51..75e1e33 100644
--- a/core/64_bit_blacklist.mk
+++ b/core/64_bit_blacklist.mk
@@ -16,10 +16,6 @@
 	device/generic/goldfish/opengl \
 	device/generic/goldfish/camera \
 
-# not needed yet, and too many directories to blacklist individually
-_64_bit_directory_blacklist += \
-	frameworks/av/media/libeffects \
-
 _64_bit_directory_blacklist_pattern := $(addsuffix %,$(_64_bit_directory_blacklist))
 
 define directory_is_64_bit_blacklisted
diff --git a/core/Makefile b/core/Makefile
index 1a008d8..918a94f 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -191,6 +191,7 @@
 			TARGET_BOOTLOADER_BOARD_NAME="$(TARGET_BOOTLOADER_BOARD_NAME)" \
 			BUILD_FINGERPRINT="$(BUILD_FINGERPRINT)" \
 			TARGET_BOARD_PLATFORM="$(TARGET_BOARD_PLATFORM)" \
+			TARGET_CPU_ABI_LIST="$(TARGET_CPU_ABI_LIST)" \
 			TARGET_CPU_ABI="$(TARGET_CPU_ABI)" \
 			TARGET_CPU_ABI2="$(TARGET_CPU_ABI2)" \
 			TARGET_AAPT_CHARACTERISTICS="$(TARGET_AAPT_CHARACTERISTICS)" \
diff --git a/core/base_rules.mk b/core/base_rules.mk
index 32e6b73..43f351a 100644
--- a/core/base_rules.mk
+++ b/core/base_rules.mk
@@ -99,8 +99,21 @@
   $(error $(LOCAL_PATH): LOCAL_MODULE_CLASS must contain exactly one word, not "$(LOCAL_MODULE_CLASS)")
 endif
 
+ifndef LOCAL_IS_HOST_MODULE
+my_32_64_bit_suffix := $(if $($(LOCAL_2ND_ARCH_VAR_PREFIX)TARGET_IS_64_BIT),64,32)
+endif
+
 ifneq (true,$(LOCAL_UNINSTALLABLE_MODULE))
+ifndef LOCAL_IS_HOST_MODULE
+my_multilib_module_path := $(strip $(LOCAL_MODULE_PATH_$(my_32_64_bit_suffix)))
+else
+my_multilib_module_path :=
+endif
+ifdef my_multilib_module_path
+my_module_path := $(my_multilib_module_path)
+else
 my_module_path := $(strip $(LOCAL_MODULE_PATH))
+endif
 my_module_relative_path := $(strip $(LOCAL_MODULE_RELATIVE_PATH))
 ifeq ($(my_module_path),)
   ifdef LOCAL_IS_HOST_MODULE
@@ -154,17 +167,7 @@
 ###########################################################
 # Pick a name for the intermediate and final targets
 ###########################################################
-ifndef LOCAL_MODULE_STEM
-  LOCAL_MODULE_STEM := $(LOCAL_MODULE)
-endif
-
-ifndef LOCAL_BUILT_MODULE_STEM
-  LOCAL_BUILT_MODULE_STEM := $(LOCAL_MODULE_STEM)$(LOCAL_MODULE_SUFFIX)
-endif
-
-ifndef LOCAL_INSTALLED_MODULE_STEM
-  LOCAL_INSTALLED_MODULE_STEM := $(LOCAL_MODULE_STEM)$(LOCAL_MODULE_SUFFIX)
-endif
+include $(BUILD_SYSTEM)/configure_module_stem.mk
 
 # OVERRIDE_BUILT_MODULE_PATH is only allowed to be used by the
 # internal SHARED_LIBRARIES build files.
diff --git a/core/binary.mk b/core/binary.mk
index 81dd5bf..cc8de46 100644
--- a/core/binary.mk
+++ b/core/binary.mk
@@ -60,9 +60,9 @@
     my_ndk_stl_cppflags := -std=c++11
   else
     # LOCAL_NDK_STL_VARIANT is gnustl_static
-    my_ndk_stl_include_path := $(my_ndk_source_root)/cxx-stl/gnu-libstdc++/libs/$(TARGET_$(LOCAL_2ND_ARCH_VAR_PREFIX)CPU_ABI)/include \
-                               $(my_ndk_source_root)/cxx-stl/gnu-libstdc++/include
-    my_ndk_stl_static_lib := $(my_ndk_source_root)/cxx-stl/gnu-libstdc++/libs/$(TARGET_$(LOCAL_2ND_ARCH_VAR_PREFIX)CPU_ABI)/libgnustl_static.a
+    my_ndk_stl_include_path := $(my_ndk_source_root)/cxx-stl/gnu-libstdc++/$($(LOCAL_2ND_ARCH_VAR_PREFIX)TARGET_GCC_VERSION)/libs/$(TARGET_$(LOCAL_2ND_ARCH_VAR_PREFIX)CPU_ABI)/include \
+                               $(my_ndk_source_root)/cxx-stl/gnu-libstdc++/$($(LOCAL_2ND_ARCH_VAR_PREFIX)TARGET_GCC_VERSION)/include
+    my_ndk_stl_static_lib := $(my_ndk_source_root)/cxx-stl/gnu-libstdc++/$($(LOCAL_2ND_ARCH_VAR_PREFIX)TARGET_GCC_VERSION)/libs/$(TARGET_$(LOCAL_2ND_ARCH_VAR_PREFIX)CPU_ABI)/libgnustl_static.a
   endif
   endif
   endif
@@ -106,8 +106,6 @@
 my_generated_sources := $(LOCAL_GENERATED_SOURCES)
 
 ifndef LOCAL_IS_HOST_MODULE
-my_32_64_bit_suffix := $(if $($(LOCAL_2ND_ARCH_VAR_PREFIX)TARGET_IS_64_BIT),64,32)
-
 my_src_files += $(LOCAL_SRC_FILES_$(TARGET_$(LOCAL_2ND_ARCH_VAR_PREFIX)ARCH)) $(LOCAL_SRC_FILES_$(my_32_64_bit_suffix))
 my_shared_libraries += $(LOCAL_SHARED_LIBRARIES_$(TARGET_$(LOCAL_2ND_ARCH_VAR_PREFIX)ARCH)) $(LOCAL_SHARED_LIBRARIES_$(my_32_64_bit_suffix))
 my_cflags += $(LOCAL_CFLAGS_$(TARGET_$(LOCAL_2ND_ARCH_VAR_PREFIX)ARCH)) $(LOCAL_CFLAGS_$(my_32_64_bit_suffix))
diff --git a/core/clang/HOST_x86.mk b/core/clang/HOST_x86.mk
index f38f04e..ee61e5e 100644
--- a/core/clang/HOST_x86.mk
+++ b/core/clang/HOST_x86.mk
@@ -1,8 +1,13 @@
 
 include $(BUILD_SYSTEM)/clang/x86.mk
+include $(BUILD_SYSTEM)/clang/x86_common.mk
 
 ifeq ($(HOST_OS),linux)
 CLANG_CONFIG_x86_HOST_TRIPLE := i686-linux-gnu
+CLANG_CONFIG_x86_HOST_COMBO_EXTRA_ASFLAGS := $(CLANG_CONFIG_x86_LINUX_HOST_EXTRA_ASFLAGS)
+CLANG_CONFIG_x86_HOST_COMBO_EXTRA_CFLAGS := $(CLANG_CONFIG_x86_LINUX_HOST_EXTRA_CFLAGS)
+CLANG_CONFIG_x86_HOST_COMBO_EXTRA_CPPFLAGS := $(CLANG_CONFIG_x86_LINUX_HOST_EXTRA_CPPFLAGS)
+CLANG_CONFIG_x86_HOST_COMBO_EXTRA_LDFLAGS := $(CLANG_CONFIG_x86_LINUX_HOST_EXTRA_LDFLAGS)
 endif
 ifeq ($(HOST_OS),darwin)
 CLANG_CONFIG_x86_HOST_TRIPLE := i686-apple-darwin
@@ -15,25 +20,29 @@
   $(CLANG_CONFIG_EXTRA_ASFLAGS) \
   $(CLANG_CONFIG_HOST_EXTRA_ASFLAGS) \
   $(CLANG_CONFIG_x86_EXTRA_ASFLAGS) \
-  -target $(CLANG_CONFIG_x86_HOST_TRIPLE) \
+  $(CLANG_CONFIG_x86_HOST_COMBO_EXTRA_ASFLAGS) \
+  -target $(CLANG_CONFIG_x86_HOST_TRIPLE)
 
 CLANG_CONFIG_x86_HOST_EXTRA_CFLAGS := \
   $(CLANG_CONFIG_EXTRA_CFLAGS) \
   $(CLANG_CONFIG_HOST_EXTRA_CFLAGS) \
   $(CLANG_CONFIG_x86_EXTRA_CFLAGS) \
+  $(CLANG_CONFIG_x86_HOST_COMBO_EXTRA_CFLAGS) \
   $(CLANG_CONFIG_x86_HOST_EXTRA_ASFLAGS)
 
 CLANG_CONFIG_x86_HOST_EXTRA_CPPFLAGS := \
   $(CLANG_CONFIG_EXTRA_CPPFLAGS) \
   $(CLANG_CONFIG_HOST_EXTRA_CPPFLAGS) \
   $(CLANG_CONFIG_x86_EXTRA_CPPFLAGS) \
+  $(CLANG_CONFIG_x86_HOST_COMBO_EXTRA_CPPFLAGS) \
+  -target $(CLANG_CONFIG_x86_HOST_TRIPLE)
 
 CLANG_CONFIG_x86_HOST_EXTRA_LDFLAGS := \
   $(CLANG_CONFIG_EXTRA_LDFLAGS) \
   $(CLANG_CONFIG_HOST_EXTRA_LDFLAGS) \
   $(CLANG_CONFIG_x86_EXTRA_LDFLAGS) \
-  -target $(CLANG_CONFIG_x86_HOST_TRIPLE) \
-
+  $(CLANG_CONFIG_x86_HOST_COMBO_EXTRA_LDFLAGS) \
+  -target $(CLANG_CONFIG_x86_HOST_TRIPLE)
 
 define convert-to-host-clang-flags
   $(strip \
diff --git a/core/clang/HOST_x86_64.mk b/core/clang/HOST_x86_64.mk
index ea33a46..d60e15f 100644
--- a/core/clang/HOST_x86_64.mk
+++ b/core/clang/HOST_x86_64.mk
@@ -1,8 +1,13 @@
 
 include $(BUILD_SYSTEM)/clang/x86_64.mk
+include $(BUILD_SYSTEM)/clang/x86_common.mk
 
 ifeq ($(HOST_OS),linux)
 CLANG_CONFIG_x86_64_HOST_TRIPLE := x86_64-linux-gnu
+CLANG_CONFIG_x86_64_HOST_COMBO_EXTRA_ASFLAGS := $(CLANG_CONFIG_x86_LINUX_HOST_EXTRA_ASFLAGS)
+CLANG_CONFIG_x86_64_HOST_COMBO_EXTRA_CFLAGS := $(CLANG_CONFIG_x86_LINUX_HOST_EXTRA_CFLAGS)
+CLANG_CONFIG_x86_64_HOST_COMBO_EXTRA_CPPFLAGS := $(CLANG_CONFIG_x86_LINUX_HOST_EXTRA_CPPFLAGS)
+CLANG_CONFIG_x86_64_HOST_COMBO_EXTRA_LDFLAGS := $(CLANG_CONFIG_x86_LINUX_HOST_EXTRA_LDFLAGS)
 endif
 ifeq ($(HOST_OS),darwin)
 CLANG_CONFIG_x86_64_HOST_TRIPLE := x86_64-apple-darwin
@@ -15,25 +20,29 @@
   $(CLANG_CONFIG_EXTRA_ASFLAGS) \
   $(CLANG_CONFIG_HOST_EXTRA_ASFLAGS) \
   $(CLANG_CONFIG_x86_64_EXTRA_ASFLAGS) \
-  -target $(CLANG_CONFIG_x86_64_HOST_TRIPLE) \
+  $(CLANG_CONFIG_x86_64_HOST_COMBO_EXTRA_ASFLAGS) \
+  -target $(CLANG_CONFIG_x86_64_HOST_TRIPLE)
 
 CLANG_CONFIG_x86_64_HOST_EXTRA_CFLAGS := \
   $(CLANG_CONFIG_EXTRA_CFLAGS) \
   $(CLANG_CONFIG_HOST_EXTRA_CFLAGS) \
   $(CLANG_CONFIG_x86_64_EXTRA_CFLAGS) \
+  $(CLANG_CONFIG_x86_64_HOST_COMBO_EXTRA_CFLAGS) \
   $(CLANG_CONFIG_x86_64_HOST_EXTRA_ASFLAGS)
 
 CLANG_CONFIG_x86_64_HOST_EXTRA_CPPFLAGS := \
   $(CLANG_CONFIG_EXTRA_CPPFLAGS) \
   $(CLANG_CONFIG_HOST_EXTRA_CPPFLAGS) \
   $(CLANG_CONFIG_x86_64_EXTRA_CPPFLAGS) \
+  $(CLANG_CONFIG_x86_64_HOST_COMBO_EXTRA_CPPFLAGS) \
+  -target $(CLANG_CONFIG_x86_64_HOST_TRIPLE)
 
 CLANG_CONFIG_x86_64_HOST_EXTRA_LDFLAGS := \
   $(CLANG_CONFIG_EXTRA_LDFLAGS) \
   $(CLANG_CONFIG_HOST_EXTRA_LDFLAGS) \
   $(CLANG_CONFIG_x86_64_EXTRA_LDFLAGS) \
-  -target $(CLANG_CONFIG_x86_64_HOST_TRIPLE) \
-
+  $(CLANG_CONFIG_x86_64_HOST_COMBO_EXTRA_LDFLAGS) \
+  -target $(CLANG_CONFIG_x86_64_HOST_TRIPLE)
 
 define convert-to-host-clang-flags
   $(strip \
diff --git a/core/clang/config.mk b/core/clang/config.mk
index 96f860d..c471f7e 100644
--- a/core/clang/config.mk
+++ b/core/clang/config.mk
@@ -6,13 +6,8 @@
 WITHOUT_HOST_CLANG := true
 endif
 
-ifeq (true,$(FORCE_BUILD_LLVM_COMPONENTS))
-LLVM_PREBUILTS_PATH := $(BUILD_OUT_EXECUTABLES)
-LLVM_PREBUILTS_HEADER_PATH := external/clang/lib/include
-else
 LLVM_PREBUILTS_PATH := prebuilts/clang/$(BUILD_OS)-x86/host/3.4/bin
 LLVM_PREBUILTS_HEADER_PATH := prebuilts/clang/$(BUILD_OS)-x86/host/3.4/lib/clang/3.4/include/
-endif
 
 CLANG := $(LLVM_PREBUILTS_PATH)/clang$(BUILD_EXECUTABLE_SUFFIX)
 CLANG_CXX := $(LLVM_PREBUILTS_PATH)/clang++$(BUILD_EXECUTABLE_SUFFIX)
@@ -38,10 +33,10 @@
   -Wno-unused-but-set-parameter
 
 # Clang flags for all host rules
-CLANG_CONFIG_HOST_EXTRA_ASFLAGS :=
-CLANG_CONFIG_HOST_EXTRA_CFLAGS :=
-CLANG_CONFIG_HOST_EXTRA_CPPFLAGS :=
-CLANG_CONFIG_HOST_EXTRA_LDFLAGS :=
+CLANG_CONFIG_HOST_EXTRA_ASFLAGS := --gcc-toolchain=$(HOST_TOOLCHAIN_FOR_CLANG)
+CLANG_CONFIG_HOST_EXTRA_CFLAGS := --gcc-toolchain=$(HOST_TOOLCHAIN_FOR_CLANG)
+CLANG_CONFIG_HOST_EXTRA_CPPFLAGS := --gcc-toolchain=$(HOST_TOOLCHAIN_FOR_CLANG)
+CLANG_CONFIG_HOST_EXTRA_LDFLAGS := --gcc-toolchain=$(HOST_TOOLCHAIN_FOR_CLANG)
 
 # Clang flags for all target rules
 CLANG_CONFIG_TARGET_EXTRA_ASFLAGS :=
@@ -50,7 +45,11 @@
 CLANG_CONFIG_TARGET_EXTRA_LDFLAGS :=
 
 # HOST config
+ifneq ($(strip $(BUILD_HOST_64bit)),)
+include $(BUILD_SYSTEM)/clang/HOST_x86_64.mk
+else
 include $(BUILD_SYSTEM)/clang/HOST_$(HOST_ARCH).mk
+endif
 
 # TARGET config
 clang_2nd_arch_prefix :=
diff --git a/core/clang/x86_common.mk b/core/clang/x86_common.mk
new file mode 100644
index 0000000..d75d83f
--- /dev/null
+++ b/core/clang/x86_common.mk
@@ -0,0 +1,42 @@
+ifeq ($(HOST_OS),darwin)
+# nothing required here yet
+endif
+
+ifeq ($(HOST_OS),linux)
+
+ifneq ($(strip $(BUILD_HOST_64bit)),)
+# Needs to be updated along with gcc
+HOST_ARCH_DESCRIPTOR_FOR_CLANG := x86_64-linux
+else
+# Needs to be updated along with gcc
+HOST_ARCH_DESCRIPTOR_FOR_CLANG := i686-linux
+endif
+
+CLANG_CONFIG_x86_LINUX_HOST_EXTRA_ASFLAGS := \
+  --sysroot=$(HOST_TOOLCHAIN_FOR_CLANG)/sysroot
+
+CLANG_CONFIG_x86_LINUX_HOST_EXTRA_CFLAGS :=
+
+CLANG_CONFIG_x86_LINUX_HOST_EXTRA_CPPFLAGS :=   \
+  --sysroot=$(HOST_TOOLCHAIN_FOR_CLANG)/sysroot \
+  -isystem $(HOST_TOOLCHAIN_FOR_CLANG)/$(HOST_ARCH_DESCRIPTOR_FOR_CLANG)/include/c++/4.6.x-google \
+  -isystem $(HOST_TOOLCHAIN_FOR_CLANG)/$(HOST_ARCH_DESCRIPTOR_FOR_CLANG)/include/c++/4.6.x-google/$(HOST_ARCH_DESCRIPTOR_FOR_CLANG) \
+  -isystem $(HOST_TOOLCHAIN_FOR_CLANG)/$(HOST_ARCH_DESCRIPTOR_FOR_CLANG)/include/c++/4.6.x-google/backward \
+
+CLANG_CONFIG_x86_LINUX_HOST_EXTRA_LDFLAGS := \
+  --sysroot=$(HOST_TOOLCHAIN_FOR_CLANG)/sysroot \
+  -B$(HOST_TOOLCHAIN_FOR_CLANG)/$(HOST_ARCH_DESCRIPTOR_FOR_CLANG)/bin \
+  -B$(HOST_TOOLCHAIN_FOR_CLANG)/lib/gcc/$(HOST_ARCH_DESCRIPTOR_FOR_CLANG)/4.6.x-google \
+  -L$(HOST_TOOLCHAIN_FOR_CLANG)/lib/gcc/$(HOST_ARCH_DESCRIPTOR_FOR_CLANG)/4.6.x-google
+
+ifneq ($(strip $(BUILD_HOST_64bit)),)
+# need to add lib64 if building 64-bit, otherwise lib
+CLANG_CONFIG_x86_LINUX_HOST_EXTRA_LDFLAGS += -L$(HOST_TOOLCHAIN_FOR_CLANG)/$(HOST_ARCH_DESCRIPTOR_FOR_CLANG)/lib64/
+else
+CLANG_CONFIG_x86_LINUX_HOST_EXTRA_LDFLAGS += -L$(HOST_TOOLCHAIN_FOR_CLANG)/$(HOST_ARCH_DESCRIPTOR_FOR_CLANG)/lib/
+endif
+endif # linux
+
+ifeq ($(HOST_OS),windows)
+# nothing required here yet
+endif
\ No newline at end of file
diff --git a/core/clear_vars.mk b/core/clear_vars.mk
index 4c403b4..ed692b9 100644
--- a/core/clear_vars.mk
+++ b/core/clear_vars.mk
@@ -197,6 +197,11 @@
 LOCAL_ASFLAGS_64:=
 LOCAL_C_INCLUDES_32:=
 LOCAL_C_INCLUDES_64:=
+LOCAL_MODULE_PATH_32:=
+LOCAL_MODULE_PATH_64:=
+LOCAL_MODULE_STEM_32:=
+LOCAL_MODULE_STEM_64:=
+LOCAL_MULTILIB:=
 
 # Trim MAKEFILE_LIST so that $(call my-dir) doesn't need to
 # iterate over thousands of entries every time.
diff --git a/core/combo/HOST_darwin-x86.mk b/core/combo/HOST_darwin-x86.mk
index 037dee6..994196a 100644
--- a/core/combo/HOST_darwin-x86.mk
+++ b/core/combo/HOST_darwin-x86.mk
@@ -156,3 +156,7 @@
 define get-file-size
 stat -f "%z" $(1)
 endef
+
+# gcc location for clang; to be updated when clang is updated
+# HOST_TOOLCHAIN_ROOT is a Darwin-specific define
+HOST_TOOLCHAIN_FOR_CLANG := $(HOST_TOOLCHAIN_ROOT)
\ No newline at end of file
diff --git a/core/combo/HOST_linux-x86.mk b/core/combo/HOST_linux-x86.mk
index 129acb0..3c87264 100644
--- a/core/combo/HOST_linux-x86.mk
+++ b/core/combo/HOST_linux-x86.mk
@@ -41,10 +41,14 @@
 # which can benefit from 64-bit host arch.
 HOST_GLOBAL_CFLAGS += -m64 -Wa,--noexecstack
 HOST_GLOBAL_LDFLAGS += -m64 -Wl,-z,noexecstack
+# gcc location for clang; to be updated when clang is updated
+HOST_TOOLCHAIN_FOR_CLANG := prebuilts/gcc/linux-x86/host/x86_64-linux-glibc2.7-4.6/
 else
 # We expect SSE3 floating point math.
 HOST_GLOBAL_CFLAGS += -mstackrealign -msse3 -mfpmath=sse -m32 -Wa,--noexecstack
 HOST_GLOBAL_LDFLAGS += -m32 -Wl,-z,noexecstack
+# gcc location for clang; to be updated when clang is updated
+HOST_TOOLCHAIN_FOR_CLANG := prebuilts/gcc/linux-x86/host/i686-linux-glibc2.7-4.6/
 endif # BUILD_HOST_64bit
 
 ifneq ($(strip $(BUILD_HOST_static)),)
diff --git a/core/combo/TARGET_linux-arm.mk b/core/combo/TARGET_linux-arm.mk
index c2e4679..5cb99b4 100644
--- a/core/combo/TARGET_linux-arm.mk
+++ b/core/combo/TARGET_linux-arm.mk
@@ -60,7 +60,6 @@
 $(combo_2nd_arch_prefix)TARGET_LD := $($(combo_2nd_arch_prefix)TARGET_TOOLS_PREFIX)ld$(HOST_EXECUTABLE_SUFFIX)
 $(combo_2nd_arch_prefix)TARGET_READELF := $($(combo_2nd_arch_prefix)TARGET_TOOLS_PREFIX)readelf$(HOST_EXECUTABLE_SUFFIX)
 $(combo_2nd_arch_prefix)TARGET_STRIP := $($(combo_2nd_arch_prefix)TARGET_TOOLS_PREFIX)strip$(HOST_EXECUTABLE_SUFFIX)
-include $(BUILD_SYSTEM)/strip.mk
 
 $(combo_2nd_arch_prefix)TARGET_NO_UNDEFINED_LDFLAGS := -Wl,--no-undefined
 
diff --git a/core/combo/TARGET_linux-arm64.mk b/core/combo/TARGET_linux-arm64.mk
index c04f2ca..08603b8 100644
--- a/core/combo/TARGET_linux-arm64.mk
+++ b/core/combo/TARGET_linux-arm64.mk
@@ -62,7 +62,6 @@
 TARGET_LD := $(TARGET_TOOLS_PREFIX)ld$(HOST_EXECUTABLE_SUFFIX)
 TARGET_READELF := $(TARGET_TOOLS_PREFIX)readelf$(HOST_EXECUTABLE_SUFFIX)
 TARGET_STRIP := $(TARGET_TOOLS_PREFIX)strip$(HOST_EXECUTABLE_SUFFIX)
-include $(BUILD_SYSTEM)/strip.mk
 
 TARGET_NO_UNDEFINED_LDFLAGS := -Wl,--no-undefined
 
diff --git a/core/combo/TARGET_linux-mips.mk b/core/combo/TARGET_linux-mips.mk
index 8ba5959..68300e1 100644
--- a/core/combo/TARGET_linux-mips.mk
+++ b/core/combo/TARGET_linux-mips.mk
@@ -60,7 +60,6 @@
 $(combo_2nd_arch_prefix)TARGET_LD := $($(combo_2nd_arch_prefix)TARGET_TOOLS_PREFIX)ld$(HOST_EXECUTABLE_SUFFIX)
 $(combo_2nd_arch_prefix)TARGET_READELF := $($(combo_2nd_arch_prefix)TARGET_TOOLS_PREFIX)readelf$(HOST_EXECUTABLE_SUFFIX)
 $(combo_2nd_arch_prefix)TARGET_STRIP := $($(combo_2nd_arch_prefix)TARGET_TOOLS_PREFIX)strip$(HOST_EXECUTABLE_SUFFIX)
-include $(BUILD_SYSTEM)/strip.mk
 
 $(combo_2nd_arch_prefix)TARGET_NO_UNDEFINED_LDFLAGS := -Wl,--no-undefined
 
diff --git a/core/combo/TARGET_linux-mips64.mk b/core/combo/TARGET_linux-mips64.mk
index c617ac1..118582b 100644
--- a/core/combo/TARGET_linux-mips64.mk
+++ b/core/combo/TARGET_linux-mips64.mk
@@ -65,7 +65,6 @@
 TARGET_LD := $(TARGET_TOOLS_PREFIX)ld$(HOST_EXECUTABLE_SUFFIX)
 TARGET_READELF := $(TARGET_TOOLS_PREFIX)readelf$(HOST_EXECUTABLE_SUFFIX)
 TARGET_STRIP := $(TARGET_TOOLS_PREFIX)strip$(HOST_EXECUTABLE_SUFFIX)
-include $(BUILD_SYSTEM)/strip.mk
 
 TARGET_NO_UNDEFINED_LDFLAGS := -Wl,--no-undefined
 
diff --git a/core/combo/TARGET_linux-x86.mk b/core/combo/TARGET_linux-x86.mk
index c471e21..80df1a4 100644
--- a/core/combo/TARGET_linux-x86.mk
+++ b/core/combo/TARGET_linux-x86.mk
@@ -53,7 +53,6 @@
 $(combo_2nd_arch_prefix)TARGET_LD := $($(combo_2nd_arch_prefix)TARGET_TOOLS_PREFIX)ld$(HOST_EXECUTABLE_SUFFIX)
 $(combo_2nd_arch_prefix)TARGET_READELF := $($(combo_2nd_arch_prefix)TARGET_TOOLS_PREFIX)readelf$(HOST_EXECUTABLE_SUFFIX)
 $(combo_2nd_arch_prefix)TARGET_STRIP := $($(combo_2nd_arch_prefix)TARGET_TOOLS_PREFIX)strip$(HOST_EXECUTABLE_SUFFIX)
-include $(BUILD_SYSTEM)/strip.mk
 
 ifneq ($(wildcard $($(combo_2nd_arch_prefix)TARGET_CC)),)
 $(combo_2nd_arch_prefix)TARGET_LIBGCC := \
diff --git a/core/combo/TARGET_linux-x86_64.mk b/core/combo/TARGET_linux-x86_64.mk
index fbc0056..fb9bacf 100644
--- a/core/combo/TARGET_linux-x86_64.mk
+++ b/core/combo/TARGET_linux-x86_64.mk
@@ -55,7 +55,6 @@
 TARGET_LD := $(TARGET_TOOLS_PREFIX)ld$(HOST_EXECUTABLE_SUFFIX)
 TARGET_READELF := $(TARGET_TOOLS_PREFIX)readelf$(HOST_EXECUTABLE_SUFFIX)
 TARGET_STRIP := $(TARGET_TOOLS_PREFIX)strip$(HOST_EXECUTABLE_SUFFIX)
-include $(BUILD_SYSTEM)/strip.mk
 
 ifneq ($(wildcard $(TARGET_CC)),)
 TARGET_LIBGCC := \
diff --git a/core/combo/arch/arm/armv7-a-neon.mk b/core/combo/arch/arm/armv7-a-neon.mk
index a021258..c6603db 100644
--- a/core/combo/arch/arm/armv7-a-neon.mk
+++ b/core/combo/arch/arm/armv7-a-neon.mk
@@ -6,7 +6,7 @@
 ARCH_ARM_HAVE_VFP_D32           := true
 ARCH_ARM_HAVE_NEON              := true
 
-ifneq (,$(filter cortex-a15 krait,$(TARGET_$(combo_2nd_arch_prefix)CPU_VARIANT)))
+ifneq (,$(filter cortex-a15 krait denver,$(TARGET_$(combo_2nd_arch_prefix)CPU_VARIANT)))
 	arch_variant_cflags := -mcpu=cortex-a15
 else
 ifeq ($(strip $(TARGET_$(combo_2nd_arch_prefix)CPU_VARIANT)),cortex-a8)
diff --git a/core/combo/javac.mk b/core/combo/javac.mk
index cc2c872..8c24e4b 100644
--- a/core/combo/javac.mk
+++ b/core/combo/javac.mk
@@ -27,7 +27,7 @@
     COMMON_JAVAC := development/host/windows/prebuilt/javawrap.exe -J-Xmx256m \
         $(common_flags)
 else
-    COMMON_JAVAC := $(JAVACC) -J-Xmx512M $(common_flags)
+    COMMON_JAVAC := $(JAVACC) -J-Xmx768M $(common_flags)
 endif
 
 # Eclipse.
diff --git a/core/config.mk b/core/config.mk
index 9b9923a..6311e68 100644
--- a/core/config.mk
+++ b/core/config.mk
@@ -456,7 +456,7 @@
 endif
 
 DEX2OAT_TARGET_INSTRUCTION_SET_FEATURES := default
-ifneq (,$(filter $(TARGET_CPU_VARIANT),cortex-a15 krait))
+ifneq (,$(filter $(TARGET_CPU_VARIANT),cortex-a7 cortex-a15 krait))
 DEX2OAT_TARGET_INSTRUCTION_SET_FEATURES := div
 endif
 
diff --git a/core/configure_module_stem.mk b/core/configure_module_stem.mk
new file mode 100644
index 0000000..2823e37
--- /dev/null
+++ b/core/configure_module_stem.mk
@@ -0,0 +1,16 @@
+my_multilib_stem := $(LOCAL_MODULE_STEM_$(if $($(LOCAL_2ND_ARCH_VAR_PREFIX)TARGET_IS_64_BIT),64,32))
+ifdef my_multilib_stem
+LOCAL_MODULE_STEM := $(my_multilib_stem)
+endif
+
+ifndef LOCAL_MODULE_STEM
+  LOCAL_MODULE_STEM := $(LOCAL_MODULE)
+endif
+
+ifndef LOCAL_BUILT_MODULE_STEM
+  LOCAL_BUILT_MODULE_STEM := $(LOCAL_MODULE_STEM)$(LOCAL_MODULE_SUFFIX)
+endif
+
+ifndef LOCAL_INSTALLED_MODULE_STEM
+  LOCAL_INSTALLED_MODULE_STEM := $(LOCAL_MODULE_STEM)$(LOCAL_MODULE_SUFFIX)
+endif
diff --git a/core/definitions.mk b/core/definitions.mk
index d6cd9d1..107813b 100644
--- a/core/definitions.mk
+++ b/core/definitions.mk
@@ -426,7 +426,7 @@
     $(eval _idf2ndArchPrefix := $(if $(call directory_is_64_bit_blacklisted,$(LOCAL_PATH))$(strip $(5)),$(TARGET_2ND_ARCH_VAR_PREFIX))) \
     $(if $(filter $(_idfPrefix)-$(_idfClass),$(COMMON_MODULE_CLASSES))$(4), \
         $(eval _idfIntBase := $($(_idfPrefix)_OUT_COMMON_INTERMEDIATES)) \
-      ,$(if $(filter $(_idfPrefix)-$(_idfClass),TARGET-SHARED_LIBRARIES TARGET-STATIC_LIBRARIES TARGET-EXECUTABLES),\
+      ,$(if $(filter $(_idfPrefix)-$(_idfClass),TARGET-SHARED_LIBRARIES TARGET-STATIC_LIBRARIES TARGET-EXECUTABLES TARGET-GYP),\
           $(eval _idfIntBase := $($(_idf2ndArchPrefix)$(_idfPrefix)_OUT_INTERMEDIATES)) \
        ,$(eval _idfIntBase := $($(_idfPrefix)_OUT_INTERMEDIATES)) \
        ) \
@@ -1321,16 +1321,23 @@
 ## Commands for filtering a target executable or library
 ###########################################################
 
+ifneq ($(TARGET_BUILD_VARIANT),user)
+  TARGET_STRIP_EXTRA = && $(PRIVATE_OBJCOPY) --add-gnu-debuglink=$< $@
+  TARGET_STRIP_KEEP_SYMBOLS_EXTRA = --add-gnu-debuglink=$<
+endif
+
 define transform-to-stripped
 @mkdir -p $(dir $@)
 @echo "target Strip: $(PRIVATE_MODULE) ($@)"
-$(hide) $($(PRIVATE_2ND_ARCH_VAR_PREFIX)TARGET_STRIP_COMMAND)
+$(hide) $(PRIVATE_STRIP) --strip-all $< -o $@ $(TARGET_STRIP_EXTRA)
 endef
 
 define transform-to-stripped-keep-symbols
 @mkdir -p $(dir $@)
 @echo "target Strip (keep symbols): $(PRIVATE_MODULE) ($@)"
-$(hide) $($(PRIVATE_2ND_ARCH_VAR_PREFIX)TARGET_STRIP_KEEP_SYMBOLS_COMMAND)
+$(hide) $(PRIVATE_OBJCOPY) \
+    `$(PRIVATE_READELF) -S $< | awk '/.debug_/ {print "-R " $$2}' | xargs` \
+    $(TARGET_STRIP_KEEP_SYMBOLS_EXTRA) $< $@
 endef
 
 
diff --git a/core/dex_preopt.mk b/core/dex_preopt.mk
index 4918a2b..46a6479 100644
--- a/core/dex_preopt.mk
+++ b/core/dex_preopt.mk
@@ -65,7 +65,7 @@
 $(call dex2oat-one-file,$(1),$(2),$(3),$(4))
 endef
 
-DEXPREOPT_ONE_FILE_DEPENDENCY_TOOLS := $(DEX2OAT_DEPENDENCY)
+DEXPREOPT_ONE_FILE_DEPENDENCY_TOOLS := $(DEX2OATD_DEPENDENCY)
 DEXPREOPT_ONE_FILE_DEPENDENCY_BUILT_BOOT_PREOPT := $(DEFAULT_DEX_PREOPT_BUILT_IMAGE)
 endif
 else
diff --git a/core/dex_preopt_libart.mk b/core/dex_preopt_libart.mk
index 0318505..7809c13 100644
--- a/core/dex_preopt_libart.mk
+++ b/core/dex_preopt_libart.mk
@@ -9,10 +9,6 @@
 LIBART_COMPILER := $(HOST_OUT_SHARED_LIBRARIES)/libart-compiler$(HOST_SHLIB_SUFFIX)
 LIBARTD_COMPILER := $(HOST_OUT_SHARED_LIBRARIES)/libartd-compiler$(HOST_SHLIB_SUFFIX)
 
-# TODO: for now, override with debug version for better error reporting
-DEX2OAT := $(DEX2OATD)
-LIBART_COMPILER := $(LIBARTD_COMPILER)
-
 # By default, do not run rerun dex2oat if the tool changes.
 # Comment out the | to force dex2oat to rerun on after all changes.
 DEX2OAT_DEPENDENCY := art/runtime/oat.cc # dependency on oat version number
@@ -21,6 +17,10 @@
 DEX2OAT_DEPENDENCY += $(DEX2OAT)
 DEX2OAT_DEPENDENCY += $(LIBART_COMPILER)
 
+DEX2OATD_DEPENDENCY := $(DEX2OAT_DEPENDENCY)
+DEX2OATD_DEPENDENCY += $(DEX2OATD)
+DEX2OATD_DEPENDENCY += $(LIBARTD_COMPILER)
+
 PRELOADED_CLASSES := frameworks/base/preloaded-classes
 
 LIBART_BOOT_IMAGE := /$(DEXPREOPT_BOOT_JAR_DIR)/boot.art
@@ -43,7 +43,7 @@
 ifeq ($(TARGET_ARCH),mips)
 LIBART_IMG_TARGET_BASE_ADDRESS := 0x30000000
 else
-LIBART_IMG_TARGET_BASE_ADDRESS := 0x60000000
+LIBART_IMG_TARGET_BASE_ADDRESS := 0x70000000
 endif
 
 ########################################################################
@@ -57,11 +57,12 @@
 # The .oat with symbols
 LIBART_TARGET_BOOT_OAT_UNSTRIPPED := $(TARGET_OUT_UNSTRIPPED)$(patsubst %.art,%.oat,$(LIBART_BOOT_IMAGE))
 
-$(DEFAULT_DEX_PREOPT_BUILT_IMAGE): $(LIBART_TARGET_BOOT_DEX_FILES) $(DEX2OAT_DEPENDENCY)
+# Use dex2oat debug version for better error reporting
+$(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) $(DEX2OAT) --runtime-arg -Xms256m --runtime-arg -Xmx256m --image-classes=$(PRELOADED_CLASSES) \
+	$(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) \
@@ -82,7 +83,7 @@
 define dex2oat-one-file
 $(hide) rm -f $(4)
 $(hide) mkdir -p $(dir $(4))
-$(hide) $(DEX2OAT) \
+$(hide) $(DEX2OATD) \
 	--runtime-arg -Xms64m --runtime-arg -Xmx64m \
 	--boot-image=$(1) \
 	--dex-file=$(2) \
diff --git a/core/dynamic_binary.mk b/core/dynamic_binary.mk
index 32f2c91..b3ca4fc 100644
--- a/core/dynamic_binary.mk
+++ b/core/dynamic_binary.mk
@@ -13,20 +13,9 @@
 endif
 
 # The name of the target file, without any path prepended.
-# TODO: This duplicates logic from base_rules.mk because we need to
-#       know its results before base_rules.mk is included.
-#       Consolidate the duplicates.
-ifndef LOCAL_MODULE_STEM
-  LOCAL_MODULE_STEM := $(LOCAL_MODULE)
-endif
-
-ifndef LOCAL_BUILT_MODULE_STEM
-  LOCAL_BUILT_MODULE_STEM := $(LOCAL_MODULE_STEM)$(LOCAL_MODULE_SUFFIX)
-endif
-
-ifndef LOCAL_INSTALLED_MODULE_STEM
-  LOCAL_INSTALLED_MODULE_STEM := $(LOCAL_MODULE_STEM)$(LOCAL_MODULE_SUFFIX)
-endif
+# This duplicates logic from base_rules.mk because we need to
+# know its results before base_rules.mk is included.
+include $(BUILD_SYSTEM)/configure_module_stem.mk
 
 # base_rules.make defines $(intermediates), but we need its value
 # before we include base_rules.  Make a guess, and verify that
diff --git a/core/envsetup.mk b/core/envsetup.mk
index 4cb389b..628c95b 100644
--- a/core/envsetup.mk
+++ b/core/envsetup.mk
@@ -143,6 +143,28 @@
 TARGET_DEVICE_DIR := $(patsubst %/,%,$(dir $(board_config_mk)))
 board_config_mk :=
 
+# "ro.product.cpu.abilist" is a comma separated list of ABIs (in order
+# of preference) that the target supports. If a TARGET_CPU_ABI_LIST
+# is specified by the board configuration, we use that. If not, we
+# build a list out of the TARGET_CPU_ABIs specified by the config.
+ifeq (,$(TARGET_CPU_ABI_LIST))
+  TARGET_CPU_ABI_LIST := $(TARGET_CPU_ABI)
+  ifneq (,$(TARGET_CPU_ABI2))
+    TARGET_CPU_ABI_LIST += ,$(TARGET_CPU_ABI2)
+  endif
+  ifneq (,$(TARGET_2ND_CPU_ABI))
+    TARGET_CPU_ABI_LIST += ,$(TARGET_2ND_CPU_ABI)
+  endif
+  ifneq (,$(TARGET_2ND_CPU_ABI2))
+    TARGET_CPU_ABI_LIST += ,$(TARGET_2ND_CPU_ABI2)
+  endif
+
+  # Strip whitespace from the ABI list string.
+  empty :=
+  space := $(empty) $(empty)
+  TARGET_CPU_ABI_LIST := $(subst $(space),,$(TARGET_CPU_ABI_LIST))
+endif
+
 # ---------------------------------------------------------------
 # Set up configuration for target machine.
 # The following must be set:
diff --git a/core/executable.mk b/core/executable.mk
index 899a02f..1e8d73a 100644
--- a/core/executable.mk
+++ b/core/executable.mk
@@ -1,31 +1,68 @@
 # We don't automatically set up rules to build executables for both
 # TARGET_ARCH and TARGET_2ND_ARCH.
 # By default, an executable is built for TARGET_ARCH.
-# To build it for TARGET_2ND_ARCH in a 64bit product, use "LOCAL_32_BIT_ONLY := true".
+# To build it for TARGET_2ND_ARCH in a 64bit product, use "LOCAL_MULTILIB := 32"
+# To build it for both set LOCAL_MULTILIB := both and specify
+# LOCAL_MODULE_PATH_32 and LOCAL_MODULE_PATH_64 or LOCAL_MODULE_STEM_32 and
+# LOCAL_MODULE_STEM_64
+
+include $(BUILD_SYSTEM)/multilib.mk
 
 ifeq ($(TARGET_PREFER_32_BIT),true)
-ifneq ($(LOCAL_NO_2ND_ARCH),true)
-LOCAL_32_BIT_ONLY := true
+ifeq (,$(filter $(my_module_multilib),first both)
+# if TARGET_PREFER_32_BIT is not explicitly set to "first" or "both"
+# build only for secondary
+my_module_multilib := 32
 endif
 endif
 
+ifndef my_module_multilib
+# executables default to building for the first architecture
+my_module_multilib := first
+endif
+
+ifeq ($(my_module_multilib),both)
+ifeq ($(LOCAL_MODULE_PATH_32)$(LOCAL_MODULE_STEM_32),)
+$(error $(LOCAL_PATH): LOCAL_MODULE_STEM_32 or LOCAL_MODULE_PATH_32 is required for LOCAL_MULTILIB := both for module $(LOCAL_MODULE))
+endif
+ifeq ($(LOCAL_MODULE_PATH_64)$(LOCAL_MODULE_STEM_64),)
+$(error $(LOCAL_PATH): LOCAL_MODULE_STEM_64 or LOCAL_MODULE_PATH_64 is required for LOCAL_MULTILIB := both for module $(LOCAL_MODULE))
+endif
+else #!LOCAL_MULTILIB == both
 LOCAL_NO_2ND_ARCH_MODULE_SUFFIX := true
+endif
 
-# check if primary arch is supported
+my_skip_secondary_arch :=
+
+# check if first arch is supported
 include $(BUILD_SYSTEM)/module_arch_supported.mk
 ifeq ($(my_module_arch_supported),true)
-# primary arch is supported
+# first arch is supported
 include $(BUILD_SYSTEM)/executable_internal.mk
-else ifneq (,$(TARGET_2ND_ARCH))
+ifneq ($(my_module_multilib),both)
+my_skip_secondary_arch := true
+endif
+endif
+
+# check if first arch was not supported or asked to build both
+ifndef my_skip_secondary_arch
+ifdef TARGET_2ND_ARCH
 # check if secondary arch is supported
 LOCAL_2ND_ARCH_VAR_PREFIX := $(TARGET_2ND_ARCH_VAR_PREFIX)
 include $(BUILD_SYSTEM)/module_arch_supported.mk
 ifeq ($(my_module_arch_supported),true)
 # secondary arch is supported
+OVERRIDE_BUILT_MODULE_PATH :=
+LOCAL_BUILT_MODULE :=
+LOCAL_INSTALLED_MODULE :=
+LOCAL_MODULE_STEM :=
+LOCAL_BUILT_MODULE_STEM :=
+LOCAL_INSTALLED_MODULE_STEM :=
+LOCAL_INTERMEDIATE_TARGETS :=
 include $(BUILD_SYSTEM)/executable_internal.mk
 endif
 endif # TARGET_2ND_ARCH
-
+endif # !my_skip_secondary_arch || LOCAL_MULTILIB
 LOCAL_2ND_ARCH_VAR_PREFIX :=
 LOCAL_NO_2ND_ARCH_MODULE_SUFFIX :=
 
diff --git a/core/executable_internal.mk b/core/executable_internal.mk
index a1ce7f2..a7c3e86 100644
--- a/core/executable_internal.mk
+++ b/core/executable_internal.mk
@@ -28,11 +28,6 @@
 
 # Define PRIVATE_ variables from global vars
 my_target_global_ld_dirs := $($(LOCAL_2ND_ARCH_VAR_PREFIX)TARGET_GLOBAL_LD_DIRS)
-ifeq ($(LOCAL_CLANG),true)
-my_target_global_ldflags := $($(LOCAL_2ND_ARCH_VAR_PREFIX)CLANG_TARGET_GLOBAL_LDFLAGS)
-else
-my_target_global_ldflags := $($(LOCAL_2ND_ARCH_VAR_PREFIX)TARGET_GLOBAL_LDFLAGS)
-endif
 my_target_fdo_lib := $($(LOCAL_2ND_ARCH_VAR_PREFIX)TARGET_FDO_LIB)
 my_target_libgcc := $($(LOCAL_2ND_ARCH_VAR_PREFIX)TARGET_LIBGCC)
 my_target_crtbegin_dynamic_o := $($(LOCAL_2ND_ARCH_VAR_PREFIX)TARGET_CRTBEGIN_DYNAMIC_O)
diff --git a/core/main.mk b/core/main.mk
index 3c4fd94..0ef05f1 100644
--- a/core/main.mk
+++ b/core/main.mk
@@ -103,7 +103,7 @@
 # Include the google-specific config
 -include vendor/google/build/config.mk
 
-VERSION_CHECK_SEQUENCE_NUMBER := 3
+VERSION_CHECK_SEQUENCE_NUMBER := 4
 -include $(OUT_DIR)/versions_checked.mk
 ifneq ($(VERSION_CHECK_SEQUENCE_NUMBER),$(VERSIONS_CHECKED))
 
@@ -151,20 +151,26 @@
 endif
 endif
 
+java_version_str := $(shell unset _JAVA_OPTIONS && java -version 2>&1)
+javac_version_str := $(shell unset _JAVA_OPTIONS && javac -version 2>&1)
+
+# Check for the current jdk
 ifeq ($(requires_openjdk), true)
-ifeq ($(shell java -version 2>&1 | grep -i openjdk),)
+# The user asked for java7 openjdk, so check that the host
+# java version is really openjdk
+ifeq ($(shell echo '$(java_version_str)' | grep -i openjdk),)
 $(info ************************************************************)
 $(info You are attempting to build with an unsupported JDK.)
 $(info $(space))
 $(info This build requires OpenJDK, but you are using:)
-$(info $(shell java -version 2>&1 | head -n 2).)
+$(info $(java_version_str).)
 $(info Please follow the machine setup instructions at)
 $(info $(space)$(space)$(space)$(space)https://source.android.com/source/download.html)
 $(info ************************************************************)
 $(error stop)
 endif # java version is not OpenJdk
 else # if requires_openjdk
-ifneq ($(shell java -version 2>&1 | grep -i openjdk),)
+ifneq ($(shell echo '$(java_version_str)' | grep -i openjdk),)
 $(info ************************************************************)
 $(info You are attempting to build with an unsupported JDK.)
 $(info $(space))
@@ -180,20 +186,41 @@
 # EXPERIMENTAL_USE_JAVA7 is set, 1.6 otherwise.
 ifneq ($(EXPERIMENTAL_USE_JAVA7),)
 required_version := "1.7.x"
-java_version := $(shell java -version 2>&1 | head -n 1 | grep '^java .*[ "]1\.7[\. "$$]')
-javac_version := $(shell javac -version 2>&1 | head -n 1 | grep '[ "]1\.7[\. "$$]')
+required_javac_version := "1.7"
+java_version := $(shell echo '$(java_version_str)' | grep '^java .*[ "]1\.7[\. "$$]')
+javac_version := $(shell echo '$(javac_version_str)' | grep '[ "]1\.7[\. "$$]')
 else # if EXPERIMENTAL_USE_JAVA7
 required_version := "1.6.x"
-java_version := $(shell java -version 2>&1 | head -n 1 | grep '^java .*[ "]1\.6[\. "$$]')
-javac_version := $(shell javac -version 2>&1 | head -n 1 | grep '[ "]1\.6[\. "$$]')
+required_javac_version := "1.6"
+java_version := $(shell echo '$(java_version_str)' | grep '^java .*[ "]1\.6[\. "$$]')
+javac_version := $(shell echo '$(javac_version_str)' | grep '[ "]1\.6[\. "$$]')
 endif # if EXPERIMENTAL_USE_JAVA7
 
+ifeq ($(required_javac_version), "1.6")
+$(info ************************************************************)
+$(info You are attempting to build with java 1.6.)
+$(info Java6 support for master builds will be dropped shortly,)
+$(info please upgrade to Java7 as soon as possible.)
+$(info $(space))
+$(info Visit http://source.android.com/source/initializing.html#installing-the-jdk for details. )
+$(info $(space))
+$(info To build using java-7:)
+$(info $(space))
+$(info $$ export EXPERIMENTAL_USE_JAVA7=true)
+$(info $$ . build/envsetup.sh)
+$(info $$ lunch <target>)
+$(info $$ make clobber)
+$(info $$ make -j8)
+$(info $(space))
+$(info ************************************************************)
+endif
+
 ifeq ($(strip $(java_version)),)
 $(info ************************************************************)
 $(info You are attempting to build with the incorrect version)
 $(info of java.)
 $(info $(space))
-$(info Your version is: $(shell java -version 2>&1 | head -n 1).)
+$(info Your version is: $(java_version_str).)
 $(info The required version is: $(required_version))
 $(info $(space))
 $(info Please follow the machine setup instructions at)
@@ -208,8 +235,8 @@
 $(info You are attempting to build with the incorrect version)
 $(info of javac.)
 $(info $(space))
-$(info Your version is: $(shell javac -version 2>&1 | head -n 1).)
-$(info The required version is: $(required_java_version))
+$(info Your version is: $(javac_version_str).)
+$(info The required version is: $(required_javac_version))
 $(info $(space))
 $(info Please follow the machine setup instructions at)
 $(info $(space)$(space)$(space)$(space)https://source.android.com/source/download.html)
@@ -217,6 +244,7 @@
 $(error stop)
 endif
 
+
 ifndef BUILD_EMULATOR
 ifeq (darwin,$(HOST_OS))
 GCC_REALPATH = $(realpath $(shell which $(HOST_CC)))
diff --git a/core/module_arch_supported.mk b/core/module_arch_supported.mk
index ddfd67d..1e03914 100644
--- a/core/module_arch_supported.mk
+++ b/core/module_arch_supported.mk
@@ -2,8 +2,7 @@
 ## Determine if a module can be built for an arch
 ##
 ## Inputs from module makefile:
-## LOCAL_32_BIT_ONLY
-## LOCAL_NO_2ND_ARCH
+## my_module_multilib
 ## LOCAL_MODULE_TARGET_ARCH
 ## LOCAL_MODULE_TARGET_ARCH_WARN
 ## LOCAL_MODULE_UNSUPPORTED_TARGET_ARCH
@@ -19,17 +18,21 @@
 
 my_module_arch_supported := true
 
+ifeq ($(my_module_multilib),none)
+my_module_arch_supported := false
+endif
+
 ifeq ($(LOCAL_2ND_ARCH_VAR_PREFIX),)
-ifeq ($(TARGET_IS_64_BIT)|$(LOCAL_32_BIT_ONLY),true|true)
+ifeq ($(TARGET_IS_64_BIT)|$(my_module_multilib),true|32)
 my_module_arch_supported := false
 else ifeq ($(call directory_is_64_bit_blacklisted,$(LOCAL_PATH)),true)
 my_module_arch_supported := false
 endif
 else # LOCAL_2ND_ARCH_VAR_PREFIX
-ifeq ($(LOCAL_NO_2ND_ARCH),true)
+ifeq ($(my_module_multilib),first)
 my_module_arch_supported := false
 endif
-endif # !LOCAL_2ND_ARCH_VAR_PREFIX
+endif # LOCAL_2ND_ARCH_VAR_PREFIX
 
 ifneq (,$(LOCAL_MODULE_TARGET_ARCH))
 ifeq (,$(filter $(TARGET_$(LOCAL_2ND_ARCH_VAR_PREFIX)ARCH),$(LOCAL_MODULE_TARGET_ARCH)))
diff --git a/core/multilib.mk b/core/multilib.mk
new file mode 100644
index 0000000..fa5397a
--- /dev/null
+++ b/core/multilib.mk
@@ -0,0 +1,26 @@
+# Translate LOCAL_32_BIT_ONLY and LOCAL_NO_2ND_ARCH to LOCAL_MULTILIB,
+# and check LOCAL_MULTILIB is a valid value.  Returns module's multilib
+# setting in my_module_multilib, or empty if not set.
+
+my_module_multilib := $(strip $(LOCAL_MULTILIB))
+ifndef my_module_multilib
+ifeq ($(LOCAL_32_BIT_ONLY)|$(LOCAL_NO_2ND_ARCH),true|true)
+ifdef TARGET_2ND_ARCH
+# Both LOCAL_32_BIT_ONLY and LOCAL_NO_2ND_ARCH specified on 64-bit target
+# skip the module completely
+my_module_multilib := none
+else
+# Both LOCAL_32_BIT_ONLY and LOCAL_NO_2ND_ARCH specified on 32-bit target
+# build for 32-bit
+my_module_multilib := 32
+endif
+else ifeq ($(LOCAL_32_BIT_ONLY),true)
+my_module_multilib := 32
+else ifeq ($(LOCAL_NO_2ND_ARCH),true)
+my_module_multilib := first
+endif
+else # my_module_multilib defined
+ifeq (,$(filter 32 first both none,$(my_module_multilib)))
+$(error $(LOCAL_PATH): Invalid LOCAL_MULTILIB specified for module $(LOCAL_MODULE))
+endif
+endif # my_module_multilib defined
diff --git a/core/package.mk b/core/package.mk
index b40ac37..337d3d0 100644
--- a/core/package.mk
+++ b/core/package.mk
@@ -1,15 +1,23 @@
 # We don't automatically set up rules to build packages for both
 # TARGET_ARCH and TARGET_2ND_ARCH.
 # By default, an package is built for TARGET_ARCH.
-# To build it for TARGET_2ND_ARCH in a 64bit product, use "LOCAL_32_BIT_ONLY := true".
+# To build it for TARGET_2ND_ARCH in a 64bit product, use "LOCAL_MULTILIB := 32".
+
+include $(BUILD_SYSTEM)/multilib.mk
+
+ifndef my_module_multilib
+# packages default to building for either architecture,
+# the first if its supported, otherwise the second.
+my_module_multilib := both
+endif
 
 LOCAL_NO_2ND_ARCH_MODULE_SUFFIX := true
 
-# check if primary arch is supported
+# check if first arch is supported
 LOCAL_2ND_ARCH_VAR_PREFIX :=
 include $(BUILD_SYSTEM)/module_arch_supported.mk
 ifeq ($(my_module_arch_supported),true)
-# primary arch is supported
+# first arch is supported
 include $(BUILD_SYSTEM)/package_internal.mk
 else ifneq (,$(TARGET_2ND_ARCH))
 # check if secondary arch is supported
diff --git a/core/prebuilt.mk b/core/prebuilt.mk
index 027c80a..5f91110 100644
--- a/core/prebuilt.mk
+++ b/core/prebuilt.mk
@@ -9,10 +9,19 @@
 ifdef LOCAL_IS_HOST_MODULE
 include $(BUILD_SYSTEM)/prebuilt_internal.mk
 else #!LOCAL_IS_HOST_MODULE
-# check if primary arch is supported
+
+include $(BUILD_SYSTEM)/multilib.mk
+
+ifndef my_module_multilib
+# prebuilts default to building for either architecture,
+# the first if its supported, otherwise the second.
+my_module_multilib := both
+endif
+
+# check if first arch is supported
 include $(BUILD_SYSTEM)/module_arch_supported.mk
 ifeq ($(my_module_arch_supported),true)
-# primary arch is supported
+# first arch is supported
 include $(BUILD_SYSTEM)/prebuilt_internal.mk
 else ifneq (,$(TARGET_2ND_ARCH))
 # check if secondary arch is supported
diff --git a/core/shared_library.mk b/core/shared_library.mk
index 87b6068..95a8d7b 100644
--- a/core/shared_library.mk
+++ b/core/shared_library.mk
@@ -10,6 +10,13 @@
 endif
 endif
 
+include $(BUILD_SYSTEM)/multilib.mk
+
+ifndef my_module_multilib
+# libraries default to building for both architecturess
+my_module_multilib := both
+endif
+
 LOCAL_2ND_ARCH_VAR_PREFIX :=
 include $(BUILD_SYSTEM)/module_arch_supported.mk
 
diff --git a/core/shared_library_internal.mk b/core/shared_library_internal.mk
index b5ac32a..7f8a483 100644
--- a/core/shared_library_internal.mk
+++ b/core/shared_library_internal.mk
@@ -16,7 +16,7 @@
 ifneq ($(strip $(OVERRIDE_BUILT_MODULE_PATH)),)
 $(error $(LOCAL_PATH): Illegal use of OVERRIDE_BUILT_MODULE_PATH)
 endif
-ifneq ($(strip $(LOCAL_MODULE_STEM)$(LOCAL_BUILT_MODULE_STEM)),)
+ifneq ($(strip $(LOCAL_MODULE_STEM)$(LOCAL_BUILT_MODULE_STEM)$(LOCAL_MODULE_STEM_32)$(LOCAL_MODULE_STEM_64)),)
 $(error $(LOCAL_PATH): Cannot set module stem for a library)
 endif
 
@@ -40,11 +40,6 @@
 
 # Define PRIVATE_ variables from global vars
 my_target_global_ld_dirs := $($(LOCAL_2ND_ARCH_VAR_PREFIX)TARGET_GLOBAL_LD_DIRS)
-ifeq ($(LOCAL_CLANG),true)
-my_target_global_ldflags := $($(LOCAL_2ND_ARCH_VAR_PREFIX)CLANG_TARGET_GLOBAL_LDFLAGS)
-else
-my_target_global_ldflags := $($(LOCAL_2ND_ARCH_VAR_PREFIX)TARGET_GLOBAL_LDFLAGS)
-endif
 my_target_fdo_lib := $($(LOCAL_2ND_ARCH_VAR_PREFIX)TARGET_FDO_LIB)
 my_target_libgcc := $($(LOCAL_2ND_ARCH_VAR_PREFIX)TARGET_LIBGCC)
 my_target_crtbegin_so_o := $($(LOCAL_2ND_ARCH_VAR_PREFIX)TARGET_CRTBEGIN_SO_O)
diff --git a/core/static_library.mk b/core/static_library.mk
index d6e8d51..bedefd0 100644
--- a/core/static_library.mk
+++ b/core/static_library.mk
@@ -1,3 +1,10 @@
+include $(BUILD_SYSTEM)/multilib.mk
+
+ifndef my_module_multilib
+# libraries default to building for both architecturess
+my_module_multilib := both
+endif
+
 LOCAL_2ND_ARCH_VAR_PREFIX :=
 include $(BUILD_SYSTEM)/module_arch_supported.mk
 
diff --git a/core/strip.mk b/core/strip.mk
deleted file mode 100644
index 906d90e..0000000
--- a/core/strip.mk
+++ /dev/null
@@ -1,25 +0,0 @@
-#
-# Copyright (C) 2014 The Android Open Source Project
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#      http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-#
-
-ifneq ($(TARGET_BUILD_VARIANT),user)
-  TARGET_STRIP_EXTRA = && $(PRIVATE_OBJCOPY) --add-gnu-debuglink=$< $@
-  TARGET_STRIP_KEEP_SYMBOLS_EXTRA = --add-gnu-debuglink=$<
-endif
-$(combo_2nd_arch_prefix)TARGET_STRIP_COMMAND = $(PRIVATE_STRIP) --strip-all $< -o $@ $(TARGET_STRIP_EXTRA)
-$(combo_2nd_arch_prefix)TARGET_STRIP_KEEP_SYMBOLS_COMMAND = \
-  $(PRIVATE_OBJCOPY) \
-    `$(PRIVATE_READELF) -S $< | awk '/.debug_/ {print "-R " $$2}' | xargs` \
-    $(TARGET_STRIP_KEEP_SYMBOLS_EXTRA) $< $@
diff --git a/core/tasks/vendor_module_check.mk b/core/tasks/vendor_module_check.mk
index 96557e3..6e18901 100644
--- a/core/tasks/vendor_module_check.mk
+++ b/core/tasks/vendor_module_check.mk
@@ -24,6 +24,7 @@
         google \
         imgtec \
         invensense \
+        intel \
         lge \
         nvidia \
         nxp \
diff --git a/target/board/generic_arm64/BoardConfig.mk b/target/board/generic_arm64/BoardConfig.mk
index 4e056d1..1768ffc 100644
--- a/target/board/generic_arm64/BoardConfig.mk
+++ b/target/board/generic_arm64/BoardConfig.mk
@@ -49,7 +49,7 @@
 
 TARGET_USERIMAGES_USE_EXT4 := true
 BOARD_SYSTEMIMAGE_PARTITION_SIZE := 576716800
-BOARD_USERDATAIMAGE_PARTITION_SIZE := 209715200
+BOARD_USERDATAIMAGE_PARTITION_SIZE := 576716800
 BOARD_CACHEIMAGE_PARTITION_SIZE := 69206016
 BOARD_CACHEIMAGE_FILE_SYSTEM_TYPE := ext4
 BOARD_FLASH_BLOCK_SIZE := 512
diff --git a/target/board/generic_x86_64/BoardConfig.mk b/target/board/generic_x86_64/BoardConfig.mk
index 7f2715e..2ed83bb 100755
--- a/target/board/generic_x86_64/BoardConfig.mk
+++ b/target/board/generic_x86_64/BoardConfig.mk
@@ -33,8 +33,8 @@
 WITH_DEXPREOPT ?= true
 endif
 
-# disable the emulator
-BUILD_EMULATOR := false
+# Build OpenGLES emulation host and guest libraries
+BUILD_EMULATOR_OPENGL := true
 
 # Build and enable the OpenGL ES View renderer. When running on the emulator,
 # the GLES renderer disables itself if host GL acceleration isn't available.
diff --git a/target/product/core_minimal.mk b/target/product/core_minimal.mk
index eb8d653..7e2b19e 100644
--- a/target/product/core_minimal.mk
+++ b/target/product/core_minimal.mk
@@ -77,4 +77,9 @@
 PRODUCT_RUNTIMES := runtime_libart_default
 PRODUCT_RUNTIMES += runtime_libdvm
 
+PRODUCT_DEFAULT_PROPERTY_OVERRIDES += \
+    ro.zygote=zygote32
+PRODUCT_COPY_FILES += \
+    system/core/rootdir/init.zygote32.rc:root/init.zygote32.rc
+
 $(call inherit-product, $(SRC_TARGET_DIR)/product/base.mk)
diff --git a/tools/buildinfo.sh b/tools/buildinfo.sh
index e3fe99c..39ddc66 100755
--- a/tools/buildinfo.sh
+++ b/tools/buildinfo.sh
@@ -20,10 +20,17 @@
 echo "ro.product.name=$PRODUCT_NAME"
 echo "ro.product.device=$TARGET_DEVICE"
 echo "ro.product.board=$TARGET_BOOTLOADER_BOARD_NAME"
+
+# These values are deprecated, use "ro.product.cpu.abilist"
+# instead (see below).
+echo "# ro.product.cpu.abi and ro.product.cpu.abi2 are obsolete,"
+echo "# use ro.product.cpu.abilist instead."
 echo "ro.product.cpu.abi=$TARGET_CPU_ABI"
 if [ -n "$TARGET_CPU_ABI2" ] ; then
   echo "ro.product.cpu.abi2=$TARGET_CPU_ABI2"
 fi
+echo "ro.product.cpu.abilist=$TARGET_CPU_ABI_LIST"
+
 echo "ro.product.manufacturer=$PRODUCT_MANUFACTURER"
 if [ -n "$PRODUCT_DEFAULT_LANGUAGE" ] ; then
   echo "ro.product.locale.language=$PRODUCT_DEFAULT_LANGUAGE"