diff --git a/core/64_bit_blacklist.mk b/core/64_bit_blacklist.mk
index 75e1e33..8e5fb80 100644
--- a/core/64_bit_blacklist.mk
+++ b/core/64_bit_blacklist.mk
@@ -1,9 +1,5 @@
 ifneq ($(TARGET_2ND_ARCH),)
 
-# JNI - needs 64-bit VM
-_64_bit_directory_blacklist += \
-        packages/
-
 # Chromium/V8: needs 64-bit support
 _64_bit_directory_blacklist += \
 	external/chromium-libpac \
diff --git a/core/binary.mk b/core/binary.mk
index cc8de46..13659f5 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 := $(my_ndk_source_root)/cxx-stl/gnu-libstdc++/$($(LOCAL_2ND_ARCH_VAR_PREFIX)TARGET_GCC_VERSION)/libs/$(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
+    my_ndk_stl_include_path := $(my_ndk_source_root)/cxx-stl/gnu-libstdc++/$($(LOCAL_2ND_ARCH_VAR_PREFIX)TARGET_NDK_GCC_VERSION)/libs/$(TARGET_$(LOCAL_2ND_ARCH_VAR_PREFIX)CPU_ABI)/include \
+                               $(my_ndk_source_root)/cxx-stl/gnu-libstdc++/$($(LOCAL_2ND_ARCH_VAR_PREFIX)TARGET_NDK_GCC_VERSION)/include
+    my_ndk_stl_static_lib := $(my_ndk_source_root)/cxx-stl/gnu-libstdc++/$($(LOCAL_2ND_ARCH_VAR_PREFIX)TARGET_NDK_GCC_VERSION)/libs/$(TARGET_$(LOCAL_2ND_ARCH_VAR_PREFIX)CPU_ABI)/libgnustl_static.a
   endif
   endif
   endif
diff --git a/core/clear_vars.mk b/core/clear_vars.mk
index ed692b9..ea47003 100644
--- a/core/clear_vars.mk
+++ b/core/clear_vars.mk
@@ -143,7 +143,6 @@
 LOCAL_NO_SYNTAX_CHECK:=
 LOCAL_NO_STATIC_ANALYZER:=
 LOCAL_32_BIT_ONLY:= # '',true
-LOCAL_NO_2ND_ARCH:= # '',true
 LOCAL_MODULE_TARGET_ARCH:=
 LOCAL_MODULE_TARGET_ARCH_WARN:=
 LOCAL_MODULE_UNSUPPORTED_TARGET_ARCH:=
diff --git a/core/combo/TARGET_linux-arm.mk b/core/combo/TARGET_linux-arm.mk
index 5cb99b4..f698ef5 100644
--- a/core/combo/TARGET_linux-arm.mk
+++ b/core/combo/TARGET_linux-arm.mk
@@ -34,6 +34,9 @@
 TARGET_$(combo_2nd_arch_prefix)ARCH_VARIANT := armv5te
 endif
 
+# Decouple NDK library selection with platform compiler version
+$(combo_2nd_arch_prefix)TARGET_NDK_GCC_VERSION := 4.8
+
 ifeq ($(strip $(TARGET_GCC_VERSION_EXP)),)
 $(combo_2nd_arch_prefix)TARGET_GCC_VERSION := 4.8
 else
diff --git a/core/combo/TARGET_linux-arm64.mk b/core/combo/TARGET_linux-arm64.mk
index 08603b8..e894f6d 100644
--- a/core/combo/TARGET_linux-arm64.mk
+++ b/core/combo/TARGET_linux-arm64.mk
@@ -34,6 +34,9 @@
 TARGET_ARCH_VARIANT := armv8
 endif
 
+# Decouple NDK library selection with platform compiler version
+TARGET_NDK_GCC_VERSION := 4.8
+
 ifeq ($(strip $(TARGET_GCC_VERSION_EXP)),)
 TARGET_GCC_VERSION := 4.8
 else
diff --git a/core/combo/TARGET_linux-mips.mk b/core/combo/TARGET_linux-mips.mk
index 68300e1..27304ee 100644
--- a/core/combo/TARGET_linux-mips.mk
+++ b/core/combo/TARGET_linux-mips.mk
@@ -34,6 +34,9 @@
 TARGET_$(combo_2nd_arch_prefix)ARCH_VARIANT := mips32r2-fp
 endif
 
+# Decouple NDK library selection with platform compiler version
+$(combo_2nd_arch_prefix)TARGET_NDK_GCC_VERSION := 4.8
+
 ifeq ($(strip $(TARGET_GCC_VERSION_EXP)),)
 $(combo_2nd_arch_prefix)TARGET_GCC_VERSION := 4.8
 else
diff --git a/core/combo/TARGET_linux-mips64.mk b/core/combo/TARGET_linux-mips64.mk
index 118582b..36b70ad 100644
--- a/core/combo/TARGET_linux-mips64.mk
+++ b/core/combo/TARGET_linux-mips64.mk
@@ -34,6 +34,9 @@
 TARGET_ARCH_VARIANT := mips64r2
 endif
 
+# Decouple NDK library selection with platform compiler version
+TARGET_NDK_GCC_VERSION := 4.8
+
 ifeq ($(strip $(TARGET_GCC_VERSION_EXP)),)
 TARGET_GCC_VERSION := 4.8
 else
diff --git a/core/combo/TARGET_linux-x86.mk b/core/combo/TARGET_linux-x86.mk
index 80df1a4..1361be2 100644
--- a/core/combo/TARGET_linux-x86.mk
+++ b/core/combo/TARGET_linux-x86.mk
@@ -22,6 +22,9 @@
 TARGET_$(combo_2nd_arch_prefix)ARCH_VARIANT := x86
 endif
 
+# Decouple NDK library selection with platform compiler version
+$(combo_2nd_arch_prefix)TARGET_NDK_GCC_VERSION := 4.8
+
 ifeq ($(strip $(TARGET_GCC_VERSION_EXP)),)
 $(combo_2nd_arch_prefix)TARGET_GCC_VERSION := 4.8
 else
diff --git a/core/combo/TARGET_linux-x86_64.mk b/core/combo/TARGET_linux-x86_64.mk
index fb9bacf..2e06263 100644
--- a/core/combo/TARGET_linux-x86_64.mk
+++ b/core/combo/TARGET_linux-x86_64.mk
@@ -22,6 +22,9 @@
 TARGET_ARCH_VARIANT := x86_64
 endif
 
+# Decouple NDK library selection with platform compiler version
+TARGET_NDK_GCC_VERSION := 4.8
+
 ifeq ($(strip $(TARGET_GCC_VERSION_EXP)),)
 TARGET_GCC_VERSION := 4.8
 else
diff --git a/core/executable.mk b/core/executable.mk
index 1e8d73a..b67ac36 100644
--- a/core/executable.mk
+++ b/core/executable.mk
@@ -8,19 +8,6 @@
 
 include $(BUILD_SYSTEM)/multilib.mk
 
-ifeq ($(TARGET_PREFER_32_BIT),true)
-ifeq (,$(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))
@@ -32,26 +19,42 @@
 LOCAL_NO_2ND_ARCH_MODULE_SUFFIX := true
 endif
 
-my_skip_secondary_arch :=
+# if TARGET_PREFER_32_BIT is set, try to build 32-bit first
+ifdef TARGET_2ND_ARCH
+ifeq ($(TARGET_PREFER_32_BIT),true)
+LOCAL_2ND_ARCH_VAR_PREFIX := $(TARGET_2ND_ARCH_VAR_PREFIX)
+else
+LOCAL_2ND_ARCH_VAR_PREFIX :=
+endif
+endif
 
-# check if first arch is supported
+my_skip_non_preferred_arch :=
+
+# check if preferred arch is supported
 include $(BUILD_SYSTEM)/module_arch_supported.mk
 ifeq ($(my_module_arch_supported),true)
 # first arch is supported
 include $(BUILD_SYSTEM)/executable_internal.mk
 ifneq ($(my_module_multilib),both)
-my_skip_secondary_arch := true
+my_skip_non_preferred_arch := true
 endif
 endif
 
-# check if first arch was not supported or asked to build both
-ifndef my_skip_secondary_arch
+# check if preferred arch was not supported or asked to build both
+ifndef my_skip_non_preferred_arch
 ifdef TARGET_2ND_ARCH
-# check if secondary arch is supported
+
+# check if the non-preferred arch is the primary or secondary
+ifeq ($(TARGET_PREFER_32_BIT),true)
+LOCAL_2ND_ARCH_VAR_PREFIX :=
+else
 LOCAL_2ND_ARCH_VAR_PREFIX := $(TARGET_2ND_ARCH_VAR_PREFIX)
+endif
+
+# check if non-preferred arch is supported
 include $(BUILD_SYSTEM)/module_arch_supported.mk
 ifeq ($(my_module_arch_supported),true)
-# secondary arch is supported
+# non-preferred arch is supported
 OVERRIDE_BUILT_MODULE_PATH :=
 LOCAL_BUILT_MODULE :=
 LOCAL_INSTALLED_MODULE :=
@@ -62,7 +65,7 @@
 include $(BUILD_SYSTEM)/executable_internal.mk
 endif
 endif # TARGET_2ND_ARCH
-endif # !my_skip_secondary_arch || LOCAL_MULTILIB
+endif # !my_skip_non_preferred_arch || LOCAL_MULTILIB
 LOCAL_2ND_ARCH_VAR_PREFIX :=
 LOCAL_NO_2ND_ARCH_MODULE_SUFFIX :=
 
diff --git a/core/module_arch_supported.mk b/core/module_arch_supported.mk
index 1e03914..753a29e 100644
--- a/core/module_arch_supported.mk
+++ b/core/module_arch_supported.mk
@@ -25,12 +25,16 @@
 ifeq ($(LOCAL_2ND_ARCH_VAR_PREFIX),)
 ifeq ($(TARGET_IS_64_BIT)|$(my_module_multilib),true|32)
 my_module_arch_supported := false
+else ifeq ($(TARGET_IS_64_BIT)|$(my_module_multilib),|64)
+my_module_arch_supported := false
 else ifeq ($(call directory_is_64_bit_blacklisted,$(LOCAL_PATH)),true)
 my_module_arch_supported := false
 endif
 else # LOCAL_2ND_ARCH_VAR_PREFIX
 ifeq ($(my_module_multilib),first)
 my_module_arch_supported := false
+else ifeq ($(my_module_multilib),64)
+my_module_arch_supported := false
 endif
 endif # LOCAL_2ND_ARCH_VAR_PREFIX
 
diff --git a/core/multilib.mk b/core/multilib.mk
index fa5397a..f630c94 100644
--- a/core/multilib.mk
+++ b/core/multilib.mk
@@ -3,24 +3,13 @@
 # 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)|$(LOCAL_NO_2ND_ARCH),true|true)
-ifdef TARGET_2ND_ARCH
-# Both LOCAL_32_BIT_ONLY and LOCAL_NO_2ND_ARCH specified on 64-bit target
-# skip the module completely
-my_module_multilib := none
-else
-# Both LOCAL_32_BIT_ONLY and LOCAL_NO_2ND_ARCH specified on 32-bit target
-# build for 32-bit
+ifeq ($(LOCAL_32_BIT_ONLY),true)
 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)))
+ifeq (,$(filter 32 64 first both none,$(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 337d3d0..fe4d0e4 100644
--- a/core/package.mk
+++ b/core/package.mk
@@ -5,23 +5,64 @@
 
 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
+ifeq ($(TARGET_SUPPORTS_32_BIT_APPS)|$(TARGET_SUPPORTS_64_BIT_APPS),true|true)
+  # packages default to building for either architecture,
+  # the preferred if its supported, otherwise the non-preferred.
+else ifeq ($(TARGET_SUPPORTS_64_BIT_APPS),true)
+  # only 64-bit apps supported
+  ifeq ($(filter $(my_module_multilib),64 both first),$(my_module_multilib))
+    # if my_module_multilib was 64, both, first, or unset, build for 64-bit
+    my_module_multilib := 64
+  else
+    # otherwise don't build this app
+    my_module_multilib := none
+  endif
+else
+  # only 32-bit apps supported
+  ifeq ($(filter $(my_module_multilib),32 both),$(my_module_multilib))
+    # if my_module_multilib was 32, both, or unset, build for 32-bit
+    my_module_multilib := 32
+  else ifeq ($(my_module_multilib),first)
+    ifndef TARGET_IS_64_BIT
+      # if my_module_multilib was first and this is a 32-bit build, build for
+      # 32-bit
+      my_module_multilib := 32
+    else
+      # if my_module_multilib was first and this is a 64-bit build, don't build
+      # this app
+      my_module_multilib := none
+    endif
+  else
+    # my_module_mulitlib was 64 or none, don't build this app
+    my_module_multilib := none
+  endif
 endif
 
 LOCAL_NO_2ND_ARCH_MODULE_SUFFIX := true
 
-# check if first arch is supported
+# if TARGET_PREFER_32_BIT is set, try to build 32-bit first
+ifdef TARGET_2ND_ARCH
+ifeq ($(TARGET_PREFER_32_BIT),true)
+LOCAL_2ND_ARCH_VAR_PREFIX := $(TARGET_2ND_ARCH_VAR_PREFIX)
+else
 LOCAL_2ND_ARCH_VAR_PREFIX :=
+endif
+endif
+
+# check if preferred arch is supported
 include $(BUILD_SYSTEM)/module_arch_supported.mk
 ifeq ($(my_module_arch_supported),true)
 # first arch is supported
 include $(BUILD_SYSTEM)/package_internal.mk
 else ifneq (,$(TARGET_2ND_ARCH))
-# check if secondary arch is supported
+# check if the non-preferred arch is the primary or secondary
+ifeq ($(TARGET_PREFER_32_BIT),true)
+LOCAL_2ND_ARCH_VAR_PREFIX :=
+else
 LOCAL_2ND_ARCH_VAR_PREFIX := $(TARGET_2ND_ARCH_VAR_PREFIX)
+endif
+
+# check if non-preferred arch is supported
 include $(BUILD_SYSTEM)/module_arch_supported.mk
 ifeq ($(my_module_arch_supported),true)
 # secondary arch is supported
diff --git a/envsetup.sh b/envsetup.sh
index 5ed3dc1..3b9423b 100644
--- a/envsetup.sh
+++ b/envsetup.sh
@@ -1021,8 +1021,10 @@
                echo ""
        fi
 
+       OUT_SO_SYMBOLS=$OUT_SO_SYMBOLS$USE64BIT
+
        echo >|"$OUT_ROOT/gdbclient.cmds" "set solib-absolute-prefix $OUT_SYMBOLS"
-       echo >>"$OUT_ROOT/gdbclient.cmds" "set solib-search-path $OUT_SO_SYMBOLS$USE64BIT:$OUT_SO_SYMBOLS/hw:$OUT_SO_SYMBOLS/ssl/engines:$OUT_SO_SYMBOLS/drm:$OUT_SO_SYMBOLS/egl:$OUT_SO_SYMBOLS/soundfx"
+       echo >>"$OUT_ROOT/gdbclient.cmds" "set solib-search-path $OUT_SO_SYMBOLS:$OUT_SO_SYMBOLS/hw:$OUT_SO_SYMBOLS/ssl/engines:$OUT_SO_SYMBOLS/drm:$OUT_SO_SYMBOLS/egl:$OUT_SO_SYMBOLS/soundfx"
        echo >>"$OUT_ROOT/gdbclient.cmds" "source $ANDROID_BUILD_TOP/development/scripts/gdb/dalvik.gdb"
        echo >>"$OUT_ROOT/gdbclient.cmds" "target remote $PORT"
        echo >>"$OUT_ROOT/gdbclient.cmds" ""