diff --git a/core/combo/TARGET_linux-arm.mk b/core/combo/TARGET_linux-arm.mk
index 3b95c5c..c8c75aa 100644
--- a/core/combo/TARGET_linux-arm.mk
+++ b/core/combo/TARGET_linux-arm.mk
@@ -30,51 +30,51 @@
 # include defines, and compiler settings for the given architecture
 # version.
 #
-ifeq ($(strip $(TARGET_ARCH_VARIANT)),)
-TARGET_ARCH_VARIANT := armv5te
+ifeq ($(strip $(TARGET_$(combo_2nd_arch_prefix)ARCH_VARIANT)),)
+TARGET_$(combo_2nd_arch_prefix)ARCH_VARIANT := armv5te
 endif
 
 ifeq ($(strip $(TARGET_GCC_VERSION_EXP)),)
-TARGET_GCC_VERSION := 4.8
+$(combo_2nd_arch_prefix)TARGET_GCC_VERSION := 4.8
 else
-TARGET_GCC_VERSION := $(TARGET_GCC_VERSION_EXP)
+$(combo_2nd_arch_prefix)TARGET_GCC_VERSION := $(TARGET_GCC_VERSION_EXP)
 endif
 
-TARGET_ARCH_SPECIFIC_MAKEFILE := $(BUILD_COMBOS)/arch/$(TARGET_ARCH)/$(TARGET_ARCH_VARIANT).mk
+TARGET_ARCH_SPECIFIC_MAKEFILE := $(BUILD_COMBOS)/arch/$(TARGET_$(combo_2nd_arch_prefix)ARCH)/$(TARGET_$(combo_2nd_arch_prefix)ARCH_VARIANT).mk
 ifeq ($(strip $(wildcard $(TARGET_ARCH_SPECIFIC_MAKEFILE))),)
-$(error Unknown ARM architecture version: $(TARGET_ARCH_VARIANT))
+$(error Unknown ARM architecture version: $(TARGET_$(combo_2nd_arch_prefix)ARCH_VARIANT))
 endif
 
 include $(TARGET_ARCH_SPECIFIC_MAKEFILE)
 
 # You can set TARGET_TOOLS_PREFIX to get gcc from somewhere else
-ifeq ($(strip $(TARGET_TOOLS_PREFIX)),)
-TARGET_TOOLCHAIN_ROOT := prebuilts/gcc/$(HOST_PREBUILT_TAG)/arm/arm-linux-androideabi-$(TARGET_GCC_VERSION)
-TARGET_TOOLS_PREFIX := $(TARGET_TOOLCHAIN_ROOT)/bin/arm-linux-androideabi-
+ifeq ($(strip $($(combo_2nd_arch_prefix)TARGET_TOOLS_PREFIX)),)
+$(combo_2nd_arch_prefix)TARGET_TOOLCHAIN_ROOT := prebuilts/gcc/$(HOST_PREBUILT_TAG)/arm/arm-linux-androideabi-$($(combo_2nd_arch_prefix)TARGET_GCC_VERSION)
+$(combo_2nd_arch_prefix)TARGET_TOOLS_PREFIX := $($(combo_2nd_arch_prefix)TARGET_TOOLCHAIN_ROOT)/bin/arm-linux-androideabi-
 endif
 
-TARGET_CC := $(TARGET_TOOLS_PREFIX)gcc$(HOST_EXECUTABLE_SUFFIX)
-TARGET_CXX := $(TARGET_TOOLS_PREFIX)g++$(HOST_EXECUTABLE_SUFFIX)
-TARGET_AR := $(TARGET_TOOLS_PREFIX)ar$(HOST_EXECUTABLE_SUFFIX)
-TARGET_OBJCOPY := $(TARGET_TOOLS_PREFIX)objcopy$(HOST_EXECUTABLE_SUFFIX)
-TARGET_LD := $(TARGET_TOOLS_PREFIX)ld$(HOST_EXECUTABLE_SUFFIX)
-TARGET_STRIP := $(TARGET_TOOLS_PREFIX)strip$(HOST_EXECUTABLE_SUFFIX)
+$(combo_2nd_arch_prefix)TARGET_CC := $($(combo_2nd_arch_prefix)TARGET_TOOLS_PREFIX)gcc$(HOST_EXECUTABLE_SUFFIX)
+$(combo_2nd_arch_prefix)TARGET_CXX := $($(combo_2nd_arch_prefix)TARGET_TOOLS_PREFIX)g++$(HOST_EXECUTABLE_SUFFIX)
+$(combo_2nd_arch_prefix)TARGET_AR := $($(combo_2nd_arch_prefix)TARGET_TOOLS_PREFIX)ar$(HOST_EXECUTABLE_SUFFIX)
+$(combo_2nd_arch_prefix)TARGET_OBJCOPY := $($(combo_2nd_arch_prefix)TARGET_TOOLS_PREFIX)objcopy$(HOST_EXECUTABLE_SUFFIX)
+$(combo_2nd_arch_prefix)TARGET_LD := $($(combo_2nd_arch_prefix)TARGET_TOOLS_PREFIX)ld$(HOST_EXECUTABLE_SUFFIX)
+$(combo_2nd_arch_prefix)TARGET_STRIP := $($(combo_2nd_arch_prefix)TARGET_TOOLS_PREFIX)strip$(HOST_EXECUTABLE_SUFFIX)
 ifeq ($(TARGET_BUILD_VARIANT),user)
-    TARGET_STRIP_COMMAND = $(TARGET_STRIP) --strip-all $< -o $@
+    $(combo_2nd_arch_prefix)TARGET_STRIP_COMMAND = $(PRIVATE_STRIP) --strip-all $< -o $@
 else
-    TARGET_STRIP_COMMAND = $(TARGET_STRIP) --strip-all $< -o $@ && \
-        $(TARGET_OBJCOPY) --add-gnu-debuglink=$< $@
+    $(combo_2nd_arch_prefix)TARGET_STRIP_COMMAND = $(PRIVATE_STRIP) --strip-all $< -o $@ && \
+        $(PRIVATE_OBJCOPY) --add-gnu-debuglink=$< $@
 endif
 
-TARGET_NO_UNDEFINED_LDFLAGS := -Wl,--no-undefined
+$(combo_2nd_arch_prefix)TARGET_NO_UNDEFINED_LDFLAGS := -Wl,--no-undefined
 
-TARGET_arm_CFLAGS :=    -O2 \
+$(combo_2nd_arch_prefix)TARGET_arm_CFLAGS :=    -O2 \
                         -fomit-frame-pointer \
                         -fstrict-aliasing    \
                         -funswitch-loops
 
 # Modules can choose to compile some source as thumb.
-TARGET_thumb_CFLAGS :=  -mthumb \
+$(combo_2nd_arch_prefix)TARGET_thumb_CFLAGS :=  -mthumb \
                         -Os \
                         -fomit-frame-pointer \
                         -fno-strict-aliasing
@@ -89,13 +89,13 @@
 # with -mlong-calls.  When built at -O0, those libraries are
 # too big for a thumb "BL <label>" to go from one end to the other.
 ifeq ($(FORCE_ARM_DEBUGGING),true)
-  TARGET_arm_CFLAGS += -fno-omit-frame-pointer -fno-strict-aliasing
-  TARGET_thumb_CFLAGS += -marm -fno-omit-frame-pointer
+  $(combo_2nd_arch_prefix)TARGET_arm_CFLAGS += -fno-omit-frame-pointer -fno-strict-aliasing
+  $(combo_2nd_arch_prefix)TARGET_thumb_CFLAGS += -marm -fno-omit-frame-pointer
 endif
 
 android_config_h := $(call select-android-config-h,linux-arm)
 
-TARGET_GLOBAL_CFLAGS += \
+$(combo_2nd_arch_prefix)TARGET_GLOBAL_CFLAGS += \
 			-msoft-float -fpic -fPIE \
 			-ffunction-sections \
 			-fdata-sections \
@@ -113,8 +113,8 @@
 # "-Wall -Werror" due to a commom idiom "ALOGV(mesg)" where ALOGV is turned
 # into no-op in some builds while mesg is defined earlier. So we explicitly
 # disable "-Wunused-but-set-variable" here.
-ifneq ($(filter 4.6 4.6.% 4.7 4.7.% 4.8, $(TARGET_GCC_VERSION)),)
-TARGET_GLOBAL_CFLAGS += -Wno-unused-but-set-variable -fno-builtin-sin \
+ifneq ($(filter 4.6 4.6.% 4.7 4.7.% 4.8, $($(combo_2nd_arch_prefix)TARGET_GCC_VERSION)),)
+$(combo_2nd_arch_prefix)TARGET_GLOBAL_CFLAGS += -Wno-unused-but-set-variable -fno-builtin-sin \
 			-fno-strict-volatile-bitfields
 endif
 
@@ -126,9 +126,9 @@
 # in their exported C++ functions). Also, GCC 4.5 has already
 # removed the warning from the compiler.
 #
-TARGET_GLOBAL_CFLAGS += -Wno-psabi
+$(combo_2nd_arch_prefix)TARGET_GLOBAL_CFLAGS += -Wno-psabi
 
-TARGET_GLOBAL_LDFLAGS += \
+$(combo_2nd_arch_prefix)TARGET_GLOBAL_LDFLAGS += \
 			-Wl,-z,noexecstack \
 			-Wl,-z,relro \
 			-Wl,-z,now \
@@ -137,12 +137,12 @@
 			-Wl,--icf=safe \
 			$(arch_variant_ldflags)
 
-TARGET_GLOBAL_CFLAGS += -mthumb-interwork
+$(combo_2nd_arch_prefix)TARGET_GLOBAL_CFLAGS += -mthumb-interwork
 
-TARGET_GLOBAL_CPPFLAGS += -fvisibility-inlines-hidden
+$(combo_2nd_arch_prefix)TARGET_GLOBAL_CPPFLAGS += -fvisibility-inlines-hidden
 
 # More flags/options can be added here
-TARGET_RELEASE_CFLAGS := \
+$(combo_2nd_arch_prefix)TARGET_RELEASE_CFLAGS := \
 			-DNDEBUG \
 			-g \
 			-Wstrict-aliasing=2 \
@@ -157,40 +157,41 @@
 
 
 ## on some hosts, the target cross-compiler is not available so do not run this command
-ifneq ($(wildcard $(TARGET_CC)),)
+ifneq ($(wildcard $($(combo_2nd_arch_prefix)TARGET_CC)),)
 # We compile with the global cflags to ensure that
 # any flags which affect libgcc are correctly taken
 # into account.
-TARGET_LIBGCC := $(shell $(TARGET_CC) $(TARGET_GLOBAL_CFLAGS) -print-libgcc-file-name)
-target_libgcov := $(shell $(TARGET_CC) $(TARGET_GLOBAL_CFLAGS) \
+$(combo_2nd_arch_prefix)TARGET_LIBGCC := $(shell $($(combo_2nd_arch_prefix)TARGET_CC) \
+        $($(combo_2nd_arch_prefix)TARGET_GLOBAL_CFLAGS) -print-libgcc-file-name)
+target_libgcov := $(shell $($(combo_2nd_arch_prefix)TARGET_CC) $($(combo_2nd_arch_prefix)TARGET_GLOBAL_CFLAGS) \
         -print-file-name=libgcov.a)
 endif
 
 # Define FDO (Feedback Directed Optimization) options.
 
-TARGET_FDO_CFLAGS:=
-TARGET_FDO_LIB:=
+$(combo_2nd_arch_prefix)TARGET_FDO_CFLAGS:=
+$(combo_2nd_arch_prefix)TARGET_FDO_LIB:=
 
 ifneq ($(strip $(BUILD_FDO_INSTRUMENT)),)
   # Set BUILD_FDO_INSTRUMENT=true to turn on FDO instrumentation.
   # The profile will be generated on /data/local/tmp/profile on the device.
-  TARGET_FDO_CFLAGS := -fprofile-generate=/data/local/tmp/profile -DANDROID_FDO
-  TARGET_FDO_LIB := $(target_libgcov)
+  $(combo_2nd_arch_prefix)TARGET_FDO_CFLAGS := -fprofile-generate=/data/local/tmp/profile -DANDROID_FDO
+  $(combo_2nd_arch_prefix)TARGET_FDO_LIB := $(target_libgcov)
 else
   # If BUILD_FDO_INSTRUMENT is turned off, then consider doing the FDO optimizations.
   # Set TARGET_FDO_PROFILE_PATH to set a custom profile directory for your build.
   ifeq ($(strip $(TARGET_FDO_PROFILE_PATH)),)
-    TARGET_FDO_PROFILE_PATH := fdo/profiles/$(TARGET_ARCH)/$(TARGET_ARCH_VARIANT)
+    $(combo_2nd_arch_prefix)TARGET_FDO_PROFILE_PATH := fdo/profiles/$(TARGET_$(combo_2nd_arch_prefix)ARCH)/$(TARGET_$(combo_2nd_arch_prefix)ARCH_VARIANT)
   else
-    ifeq ($(strip $(wildcard $(TARGET_FDO_PROFILE_PATH))),)
-      $(warning Custom TARGET_FDO_PROFILE_PATH supplied, but directory does not exist. Turn off FDO.)
+    ifeq ($(strip $(wildcard $($(combo_2nd_arch_prefix)TARGET_FDO_PROFILE_PATH))),)
+      $(warning Custom $(combo_2nd_arch_prefix)TARGET_FDO_PROFILE_PATH supplied, but directory does not exist. Turn off FDO.)
     endif
   endif
 
   # If the FDO profile directory can't be found, then FDO is off.
-  ifneq ($(strip $(wildcard $(TARGET_FDO_PROFILE_PATH))),)
-    TARGET_FDO_CFLAGS := -fprofile-use=$(TARGET_FDO_PROFILE_PATH) -DANDROID_FDO
-    TARGET_FDO_LIB := $(target_libgcov)
+  ifneq ($(strip $(wildcard $($(combo_2nd_arch_prefix)TARGET_FDO_PROFILE_PATH))),)
+    $(combo_2nd_arch_prefix)TARGET_FDO_CFLAGS := -fprofile-use=$($(combo_2nd_arch_prefix)TARGET_FDO_PROFILE_PATH) -DANDROID_FDO
+    $(combo_2nd_arch_prefix)TARGET_FDO_LIB := $(target_libgcov)
   endif
 endif
 
@@ -199,7 +200,7 @@
 KERNEL_HEADERS_ARCH   := $(libc_root)/kernel/uapi/asm-$(TARGET_ARCH)
 KERNEL_HEADERS := $(KERNEL_HEADERS_COMMON) $(KERNEL_HEADERS_ARCH)
 
-TARGET_C_INCLUDES := \
+$(combo_2nd_arch_prefix)TARGET_C_INCLUDES := \
 	$(libc_root)/arch-arm/include \
 	$(libc_root)/include \
 	$(libstdc++_root)/include \
@@ -208,20 +209,20 @@
 	$(libm_root)/include/arm \
 	$(libthread_db_root)/include
 
-TARGET_CRTBEGIN_STATIC_O := $(TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtbegin_static.o
-TARGET_CRTBEGIN_DYNAMIC_O := $(TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtbegin_dynamic.o
-TARGET_CRTEND_O := $(TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtend_android.o
+$(combo_2nd_arch_prefix)TARGET_CRTBEGIN_STATIC_O := $($(combo_2nd_arch_prefix)TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtbegin_static.o
+$(combo_2nd_arch_prefix)TARGET_CRTBEGIN_DYNAMIC_O := $($(combo_2nd_arch_prefix)TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtbegin_dynamic.o
+$(combo_2nd_arch_prefix)TARGET_CRTEND_O := $($(combo_2nd_arch_prefix)TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtend_android.o
 
-TARGET_CRTBEGIN_SO_O := $(TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtbegin_so.o
-TARGET_CRTEND_SO_O := $(TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtend_so.o
+$(combo_2nd_arch_prefix)TARGET_CRTBEGIN_SO_O := $($(combo_2nd_arch_prefix)TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtbegin_so.o
+$(combo_2nd_arch_prefix)TARGET_CRTEND_SO_O := $($(combo_2nd_arch_prefix)TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtend_so.o
 
-TARGET_STRIP_MODULE:=true
+$(combo_2nd_arch_prefix)TARGET_STRIP_MODULE:=true
 
-TARGET_DEFAULT_SYSTEM_SHARED_LIBRARIES := libc libstdc++ libm
+$(combo_2nd_arch_prefix)TARGET_DEFAULT_SYSTEM_SHARED_LIBRARIES := libc libstdc++ libm
 
-TARGET_CUSTOM_LD_COMMAND := true
+$(combo_2nd_arch_prefix)TARGET_CUSTOM_LD_COMMAND := true
 
-define transform-o-to-shared-lib-inner
+define $(combo_2nd_arch_prefix)transform-o-to-shared-lib-inner
 $(hide) $(PRIVATE_CXX) \
 	-nostdlib -Wl,-soname,$(notdir $@) \
 	-Wl,--gc-sections \
@@ -245,7 +246,7 @@
 	$(if $(filter true,$(PRIVATE_NO_CRT)),,$(PRIVATE_TARGET_CRTEND_SO_O))
 endef
 
-define transform-o-to-executable-inner
+define $(combo_2nd_arch_prefix)transform-o-to-executable-inner
 $(hide) $(PRIVATE_CXX) -nostdlib -Bdynamic -fPIE -pie \
 	-Wl,-dynamic-linker,/system/bin/linker \
 	-Wl,--gc-sections \
@@ -270,7 +271,7 @@
 	$(if $(filter true,$(PRIVATE_NO_CRT)),,$(PRIVATE_TARGET_CRTEND_O))
 endef
 
-define transform-o-to-static-executable-inner
+define $(combo_2nd_arch_prefix)transform-o-to-static-executable-inner
 $(hide) $(PRIVATE_CXX) -nostdlib -Bstatic \
 	-Wl,--gc-sections \
 	-o $@ \
diff --git a/core/combo/TARGET_linux-arm64.mk b/core/combo/TARGET_linux-arm64.mk
index c07a096..7819d80 100644
--- a/core/combo/TARGET_linux-arm64.mk
+++ b/core/combo/TARGET_linux-arm64.mk
@@ -65,10 +65,10 @@
 TARGET_LD := $(TARGET_TOOLS_PREFIX)ld$(HOST_EXECUTABLE_SUFFIX)
 TARGET_STRIP := $(TARGET_TOOLS_PREFIX)strip$(HOST_EXECUTABLE_SUFFIX)
 ifeq ($(TARGET_BUILD_VARIANT),user)
-    TARGET_STRIP_COMMAND = $(TARGET_STRIP) --strip-all $< -o $@
+    TARGET_STRIP_COMMAND = $(PRIVATE_STRIP) --strip-all $< -o $@
 else
-    TARGET_STRIP_COMMAND = $(TARGET_STRIP) --strip-all $< -o $@ && \
-        $(TARGET_OBJCOPY) --add-gnu-debuglink=$< $@
+    TARGET_STRIP_COMMAND = $(PRIVATE_STRIP) --strip-all $< -o $@ && \
+        $(PRIVATE_OBJCOPY) --add-gnu-debuglink=$< $@
 endif
 
 TARGET_NO_UNDEFINED_LDFLAGS := -Wl,--no-undefined
diff --git a/core/combo/TARGET_linux-mips.mk b/core/combo/TARGET_linux-mips.mk
index 4d19216..dea8485 100644
--- a/core/combo/TARGET_linux-mips.mk
+++ b/core/combo/TARGET_linux-mips.mk
@@ -60,10 +60,10 @@
 TARGET_LD := $(TARGET_TOOLS_PREFIX)ld$(HOST_EXECUTABLE_SUFFIX)
 TARGET_STRIP := $(TARGET_TOOLS_PREFIX)strip$(HOST_EXECUTABLE_SUFFIX)
 ifeq ($(TARGET_BUILD_VARIANT),user)
-    TARGET_STRIP_COMMAND = $(TARGET_STRIP) --strip-all $< -o $@
+    TARGET_STRIP_COMMAND = $(PRIVATE_STRIP) --strip-all $< -o $@
 else
-    TARGET_STRIP_COMMAND = $(TARGET_STRIP) --strip-all $< -o $@ && \
-        $(TARGET_OBJCOPY) --add-gnu-debuglink=$< $@
+    TARGET_STRIP_COMMAND = $(PRIVATE_STRIP) --strip-all $< -o $@ && \
+        $(PRIVATE_OBJCOPY) --add-gnu-debuglink=$< $@
 endif
 
 TARGET_NO_UNDEFINED_LDFLAGS := -Wl,--no-undefined
diff --git a/core/combo/TARGET_linux-x86.mk b/core/combo/TARGET_linux-x86.mk
index 56c4335..dcf8819 100755
--- a/core/combo/TARGET_linux-x86.mk
+++ b/core/combo/TARGET_linux-x86.mk
@@ -54,10 +54,10 @@
 TARGET_STRIP := $(TARGET_TOOLS_PREFIX)strip$(HOST_EXECUTABLE_SUFFIX)
 
 ifeq ($(TARGET_BUILD_VARIANT),user)
-TARGET_STRIP_COMMAND = $(TARGET_STRIP) --strip-debug $< -o $@
+TARGET_STRIP_COMMAND = $(PRIVATE_STRIP) --strip-debug $< -o $@
 else
-TARGET_STRIP_COMMAND = $(TARGET_STRIP) --strip-debug $< -o $@ && \
-	$(TARGET_OBJCOPY) --add-gnu-debuglink=$< $@
+TARGET_STRIP_COMMAND = $(PRIVATE_STRIP) --strip-debug $< -o $@ && \
+    $(PRIVATE_OBJCOPY) --add-gnu-debuglink=$< $@
 endif
 
 ifneq ($(wildcard $(TARGET_CC)),)
diff --git a/core/combo/TARGET_linux-x86_64.mk b/core/combo/TARGET_linux-x86_64.mk
index dd19069..22ba09a 100755
--- a/core/combo/TARGET_linux-x86_64.mk
+++ b/core/combo/TARGET_linux-x86_64.mk
@@ -56,10 +56,10 @@
 TARGET_STRIP := $(TARGET_TOOLS_PREFIX)strip$(HOST_EXECUTABLE_SUFFIX)
 
 ifeq ($(TARGET_BUILD_VARIANT),user)
-TARGET_STRIP_COMMAND = $(TARGET_STRIP) --strip-debug $< -o $@
+TARGET_STRIP_COMMAND = $(PRIVATE_STRIP) --strip-debug $< -o $@
 else
-TARGET_STRIP_COMMAND = $(TARGET_STRIP) --strip-debug $< -o $@ && \
-	$(TARGET_OBJCOPY) --add-gnu-debuglink=$< $@
+TARGET_STRIP_COMMAND = $(PRIVATE_STRIP) --strip-debug $< -o $@ && \
+	$(PRIVATE_OBJCOPY) --add-gnu-debuglink=$< $@
 endif
 
 ifneq ($(wildcard $(TARGET_CC)),)
diff --git a/core/combo/arch/arm/armv7-a-neon.mk b/core/combo/arch/arm/armv7-a-neon.mk
index 1105330..53d9220 100644
--- a/core/combo/arch/arm/armv7-a-neon.mk
+++ b/core/combo/arch/arm/armv7-a-neon.mk
@@ -1,10 +1,10 @@
 # Configuration for Linux on ARM.
 # Generating binaries for the ARMv7-a architecture and higher with NEON
 #
-ARCH_ARM_HAVE_ARMV7A            := true
-ARCH_ARM_HAVE_VFP               := true
-ARCH_ARM_HAVE_VFP_D32           := true
-ARCH_ARM_HAVE_NEON              := true
+$(combo_2nd_arch_prefix)ARCH_ARM_HAVE_ARMV7A            := true
+$(combo_2nd_arch_prefix)ARCH_ARM_HAVE_VFP               := true
+$(combo_2nd_arch_prefix)ARCH_ARM_HAVE_VFP_D32           := true
+$(combo_2nd_arch_prefix)ARCH_ARM_HAVE_NEON              := true
 
 ifeq ($(TARGET_CPU_VARIANT),$(filter $(TARGET_CPU_VARIANT),cortex-a15 krait))
 	arch_variant_cflags := -mcpu=cortex-a15
diff --git a/core/combo/arch/arm/armv7-a.mk b/core/combo/arch/arm/armv7-a.mk
index 4a51977..9549478 100644
--- a/core/combo/arch/arm/armv7-a.mk
+++ b/core/combo/arch/arm/armv7-a.mk
@@ -1,8 +1,8 @@
 # Configuration for Linux on ARM.
 # Generating binaries for the ARMv7-a architecture and higher
 #
-ARCH_ARM_HAVE_ARMV7A            := true
-ARCH_ARM_HAVE_VFP               := true
+$(combo_2nd_arch_prefix)ARCH_ARM_HAVE_ARMV7A            := true
+$(combo_2nd_arch_prefix)ARCH_ARM_HAVE_VFP               := true
 
 # Note: Hard coding the 'tune' value here is probably not ideal,
 # and a better solution should be found in the future.
diff --git a/core/combo/select.mk b/core/combo/select.mk
index 7638bc4..ec53423 100644
--- a/core/combo/select.mk
+++ b/core/combo/select.mk
@@ -18,43 +18,51 @@
 #
 # Inputs:
 #	combo_target -- prefix for final variables (HOST_ or TARGET_)
+#	combo_2nd_arch_prefix -- it's defined if this is loaded for TARGET_2ND_ARCH.
 #
 
 # Build a target string like "linux-arm" or "darwin-x86".
+ifdef combo_2nd_arch_prefix
+combo_os_arch := $($(combo_target)OS)-$(TARGET_2ND_ARCH)
+else
 combo_os_arch := $($(combo_target)OS)-$($(combo_target)ARCH)
+endif
+
+combo_var_prefix := $(combo_2nd_arch_prefix)$(combo_target)
 
 # Set reasonable defaults for the various variables
 
-$(combo_target)CC := $(CC)
-$(combo_target)CXX := $(CXX)
-$(combo_target)AR := $(AR)
-$(combo_target)STRIP := $(STRIP)
+$(combo_var_prefix)CC := $(CC)
+$(combo_var_prefix)CXX := $(CXX)
+$(combo_var_prefix)AR := $(AR)
+$(combo_var_prefix)STRIP := $(STRIP)
 
-$(combo_target)BINDER_MINI := 0
+$(combo_var_prefix)BINDER_MINI := 0
 
-$(combo_target)HAVE_EXCEPTIONS := 0
-$(combo_target)HAVE_UNIX_FILE_PATH := 1
-$(combo_target)HAVE_WINDOWS_FILE_PATH := 0
-$(combo_target)HAVE_RTTI := 1
-$(combo_target)HAVE_CALL_STACKS := 1
-$(combo_target)HAVE_64BIT_IO := 1
-$(combo_target)HAVE_CLOCK_TIMERS := 1
-$(combo_target)HAVE_PTHREAD_RWLOCK := 1
-$(combo_target)HAVE_STRNLEN := 1
-$(combo_target)HAVE_STRERROR_R_STRRET := 1
-$(combo_target)HAVE_STRLCPY := 0
-$(combo_target)HAVE_STRLCAT := 0
-$(combo_target)HAVE_KERNEL_MODULES := 0
+$(combo_var_prefix)HAVE_EXCEPTIONS := 0
+$(combo_var_prefix)HAVE_UNIX_FILE_PATH := 1
+$(combo_var_prefix)HAVE_WINDOWS_FILE_PATH := 0
+$(combo_var_prefix)HAVE_RTTI := 1
+$(combo_var_prefix)HAVE_CALL_STACKS := 1
+$(combo_var_prefix)HAVE_64BIT_IO := 1
+$(combo_var_prefix)HAVE_CLOCK_TIMERS := 1
+$(combo_var_prefix)HAVE_PTHREAD_RWLOCK := 1
+$(combo_var_prefix)HAVE_STRNLEN := 1
+$(combo_var_prefix)HAVE_STRERROR_R_STRRET := 1
+$(combo_var_prefix)HAVE_STRLCPY := 0
+$(combo_var_prefix)HAVE_STRLCAT := 0
+$(combo_var_prefix)HAVE_KERNEL_MODULES := 0
 
-$(combo_target)GLOBAL_CFLAGS := -fno-exceptions -Wno-multichar
-$(combo_target)RELEASE_CFLAGS := -O2 -g -fno-strict-aliasing
-$(combo_target)GLOBAL_LDFLAGS :=
-$(combo_target)GLOBAL_ARFLAGS := crsPD
+$(combo_var_prefix)GLOBAL_CFLAGS := -fno-exceptions -Wno-multichar
+$(combo_var_prefix)RELEASE_CFLAGS := -O2 -g -fno-strict-aliasing
+$(combo_var_prefix)GLOBAL_CPPFLAGS :=
+$(combo_var_prefix)GLOBAL_LDFLAGS :=
+$(combo_var_prefix)GLOBAL_ARFLAGS := crsPD
 
-$(combo_target)EXECUTABLE_SUFFIX :=
-$(combo_target)SHLIB_SUFFIX := .so
-$(combo_target)JNILIB_SUFFIX := $($(combo_target)SHLIB_SUFFIX)
-$(combo_target)STATIC_LIB_SUFFIX := .a
+$(combo_var_prefix)EXECUTABLE_SUFFIX :=
+$(combo_var_prefix)SHLIB_SUFFIX := .so
+$(combo_var_prefix)JNILIB_SUFFIX := $($(combo_var_prefix)SHLIB_SUFFIX)
+$(combo_var_prefix)STATIC_LIB_SUFFIX := .a
 
 # Now include the combo for this specific target.
 include $(BUILD_COMBOS)/$(combo_target)$(combo_os_arch).mk
@@ -88,11 +96,11 @@
   ccache := $(strip $(wildcard $(ccache)))
   ifdef ccache
     # prepend ccache if necessary
-    ifneq ($(ccache),$(firstword $($(combo_target)CC)))
-      $(combo_target)CC := $(ccache) $($(combo_target)CC)
+    ifneq ($(ccache),$(firstword $($(combo_var_prefix)CC)))
+      $(combo_var_prefix)CC := $(ccache) $($(combo_var_prefix)CC)
     endif
-    ifneq ($(ccache),$(firstword $($(combo_target)CXX)))
-      $(combo_target)CXX := $(ccache) $($(combo_target)CXX)
+    ifneq ($(ccache),$(firstword $($(combo_var_prefix)CXX)))
+      $(combo_var_prefix)CXX := $(ccache) $($(combo_var_prefix)CXX)
     endif
     ccache =
   endif
diff --git a/core/config.mk b/core/config.mk
index e5e46df..ee47772 100644
--- a/core/config.mk
+++ b/core/config.mk
@@ -208,14 +208,23 @@
 endef
 
 combo_target := HOST_
+combo_2nd_arch_prefix :=
 include $(BUILD_SYSTEM)/combo/select.mk
 
 # on windows, the tools have .exe at the end, and we depend on the
 # host config stuff being done first
 
 combo_target := TARGET_
+combo_2nd_arch_prefix :=
 include $(BUILD_SYSTEM)/combo/select.mk
 
+# Load the 2nd target arch if it's needed.
+ifdef TARGET_2ND_ARCH
+combo_target := TARGET_
+combo_2nd_arch_prefix := $(TARGET_2ND_ARCH_VAR_PREFIX)
+include $(BUILD_SYSTEM)/combo/select.mk
+endif
+
 # Compute TARGET_TOOLCHAIN_ROOT from TARGET_TOOLS_PREFIX
 # if only TARGET_TOOLS_PREFIX is passed to the make command.
 ifndef TARGET_TOOLCHAIN_ROOT
@@ -422,6 +431,19 @@
 TARGET_GLOBAL_CFLAGS += $(TARGET_RELEASE_CFLAGS)
 TARGET_GLOBAL_CPPFLAGS += $(TARGET_RELEASE_CPPFLAGS)
 
+ifdef TARGET_2ND_ARCH
+$(combo_2nd_arch_prefix)TARGET_GLOBAL_CFLAGS += $(COMMON_GLOBAL_CFLAGS)
+$(combo_2nd_arch_prefix)TARGET_RELEASE_CFLAGS += $(COMMON_RELEASE_CFLAGS)
+$(combo_2nd_arch_prefix)TARGET_GLOBAL_CPPFLAGS += $(COMMON_GLOBAL_CPPFLAGS)
+$(combo_2nd_arch_prefix)TARGET_RELEASE_CPPFLAGS += $(COMMON_RELEASE_CPPFLAGS)
+$(combo_2nd_arch_prefix)TARGET_GLOBAL_LD_DIRS += -L$($(combo_2nd_arch_prefix)TARGET_OUT_INTERMEDIATE_LIBRARIES)
+$(combo_2nd_arch_prefix)TARGET_PROJECT_INCLUDES := $(TARGET_PROJECT_INCLUDES)
+$(combo_2nd_arch_prefix)TARGET_GLOBAL_CFLAGS += $(TARGET_ERROR_FLAGS)
+$(combo_2nd_arch_prefix)TARGET_GLOBAL_CPPFLAGS += $(TARGET_ERROR_FLAGS)
+$(combo_2nd_arch_prefix)TARGET_GLOBAL_CFLAGS += $($(combo_2nd_arch_prefix)TARGET_RELEASE_CFLAGS)
+$(combo_2nd_arch_prefix)TARGET_GLOBAL_CPPFLAGS += $($(combo_2nd_arch_prefix)TARGET_RELEASE_CPPFLAGS)
+endif
+
 # allow overriding default Java libraries on a per-target basis
 ifeq ($(TARGET_DEFAULT_JAVA_LIBRARIES),)
   TARGET_DEFAULT_JAVA_LIBRARIES := core core-junit ext framework framework2
diff --git a/core/dynamic_binary.mk b/core/dynamic_binary.mk
index 34e028f..cd08690 100644
--- a/core/dynamic_binary.mk
+++ b/core/dynamic_binary.mk
@@ -106,6 +106,8 @@
 
 ifeq ($(LOCAL_STRIP_MODULE),true)
 # Strip the binary
+$(strip_output): PRIVATE_STRIP := $(TARGET_STRIP)
+$(strip_output): PRIVATE_OBJCOPY := $(TARGET_OBJCOPY)
 $(strip_output): $(strip_input) | $(TARGET_STRIP)
 	$(transform-to-stripped)
 else
diff --git a/core/envsetup.mk b/core/envsetup.mk
index ab8426e..99ec0cd 100644
--- a/core/envsetup.mk
+++ b/core/envsetup.mk
@@ -232,6 +232,12 @@
 TARGET_OUT_NOTICE_FILES := $(TARGET_OUT_INTERMEDIATES)/NOTICE_FILES
 TARGET_OUT_FAKE := $(PRODUCT_OUT)/fake_packages
 
+# Out for TARGET_2ND_ARCH
+TARGET_2ND_ARCH_VAR_PREFIX := 2ND_
+$(TARGET_2ND_ARCH_VAR_PREFIX)TARGET_OUT_INTERMEDIATES := $(PRODUCT_OUT)/obj_$(TARGET_2ND_ARCH)
+$(TARGET_2ND_ARCH_VAR_PREFIX)TARGET_OUT_INTERMEDIATE_LIBRARIES := $($(TARGET_2ND_ARCH_VAR_PREFIX)TARGET_OUT_INTERMEDIATES)/lib
+$(TARGET_2ND_ARCH_VAR_PREFIX)TARGET_OUT_SHARED_LIBRARIES := $(TARGET_OUT)/lib
+
 TARGET_OUT_DATA := $(PRODUCT_OUT)/$(TARGET_COPY_OUT_DATA)
 TARGET_OUT_DATA_EXECUTABLES := $(TARGET_OUT_EXECUTABLES)
 TARGET_OUT_DATA_SHARED_LIBRARIES := $(TARGET_OUT_SHARED_LIBRARIES)