diff --git a/core/Makefile b/core/Makefile
index 7d10f0f..3f48660 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -1250,6 +1250,15 @@
 
 
 FULL_SYSTEMIMAGE_DEPS := $(INTERNAL_SYSTEMIMAGE_FILES) $(INTERNAL_USERIMAGES_DEPS)
+
+# ASAN libraries in the system image - add dependency.
+ASAN_IN_SYSTEM_INSTALLED := $(TARGET_OUT)/asan.tar.bz2
+ifneq (,$(SANITIZE_TARGET))
+  ifeq (true,$(SANITIZE_TARGET_SYSTEM))
+    FULL_SYSTEMIMAGE_DEPS += $(ASAN_IN_SYSTEM_INSTALLED)
+  endif
+endif
+
 # -----------------------------------------------------------------
 # installed file list
 # Depending on anything that $(BUILT_SYSTEMIMAGE) depends on.
@@ -1526,9 +1535,11 @@
 
 # We just build this directly to the install location.
 INSTALLED_USERDATAIMAGE_TARGET := $(BUILT_USERDATAIMAGE_TARGET)
-$(INSTALLED_USERDATAIMAGE_TARGET): $(INTERNAL_USERIMAGES_DEPS) \
-                                   $(INTERNAL_USERDATAIMAGE_FILES) \
-                                   $(BUILD_IMAGE_SRCS)
+INSTALLED_USERDATAIMAGE_TARGET_DEPS := \
+    $(INTERNAL_USERIMAGES_DEPS) \
+    $(INTERNAL_USERDATAIMAGE_FILES) \
+    $(BUILD_IMAGE_SRCS)
+$(INSTALLED_USERDATAIMAGE_TARGET): $(INSTALLED_USERDATAIMAGE_TARGET_DEPS)
 	$(build-userdataimage-target)
 
 .PHONY: userdataimage-nodeps
@@ -1538,6 +1549,17 @@
 endif # not skip_userdata.img
 skip_userdata.img :=
 
+# ASAN libraries in the system image - build rule.
+ASAN_OUT_DIRS_FOR_SYSTEM_INSTALL := $(sort $(patsubst $(PRODUCT_OUT)/%,%,\
+  $(TARGET_OUT_SHARED_LIBRARIES) \
+  $(2ND_TARGET_OUT_SHARED_LIBRARIES) \
+  $(TARGET_OUT_VENDOR_SHARED_LIBRARIES) \
+  $(2ND_TARGET_OUT_VENDOR_SHARED_LIBRARIES)))
+# Note: experimentally, it seems not worth it to try to get "best" compression. We don't save
+#       enough space.
+$(ASAN_IN_SYSTEM_INSTALLED): $(INSTALLED_USERDATAIMAGE_TARGET_DEPS)
+	tar cfj $(ASAN_IN_SYSTEM_INSTALLED) -C $(TARGET_OUT_DATA)/.. $(ASAN_OUT_DIRS_FOR_SYSTEM_INSTALL) >/dev/null
+
 #######
 ## data partition tarball
 define build-userdatatarball-target
diff --git a/core/binary.mk b/core/binary.mk
index 97f1c6f..3eb7760 100644
--- a/core/binary.mk
+++ b/core/binary.mk
@@ -112,12 +112,12 @@
   # that for the generated libraries. Clip the API level to the minimum where
   # appropriate.
   ifdef LOCAL_USE_VNDK
-    my_ndk_api := $(BOARD_VNDK_VERSION)
+    my_ndk_api := current
   else
     my_ndk_api := $(LOCAL_SDK_VERSION)
-  endif
-  ifneq ($(my_ndk_api),current)
+    ifneq ($(my_ndk_api),current)
       my_ndk_api := $(call math_max,$(my_ndk_api),$(my_min_sdk_version))
+    endif
   endif
 
   my_ndk_api_def := $(my_ndk_api)
diff --git a/core/config.mk b/core/config.mk
index 9c93240..f033ad9 100644
--- a/core/config.mk
+++ b/core/config.mk
@@ -499,8 +499,6 @@
 ZIP2ZIP := $(SOONG_HOST_OUT_EXECUTABLES)/zip2zip
 FILESLIST := $(SOONG_HOST_OUT_EXECUTABLES)/fileslist
 
-JAVAC_FILTER := $(SOONG_HOST_OUT_EXECUTABLES)/soong_javac_filter
-
 # Always use prebuilts for ckati and makeparallel
 prebuilt_build_tools := prebuilts/build-tools
 ifeq ($(filter address,$(SANITIZE_HOST)),)
diff --git a/core/definitions.mk b/core/definitions.mk
index 159073e..df8dc86 100644
--- a/core/definitions.mk
+++ b/core/definitions.mk
@@ -2219,7 +2219,7 @@
 $(hide) tr ' ' '\n' < $(PRIVATE_CLASS_INTERMEDIATES_DIR)/java-source-list \
     | $(NORMALIZE_PATH) | sort -u > $(PRIVATE_CLASS_INTERMEDIATES_DIR)/java-source-list-uniq
 $(hide) if [ -s $(PRIVATE_CLASS_INTERMEDIATES_DIR)/java-source-list-uniq ] ; then \
-    ( $(1) -encoding UTF-8 \
+    $(1) -encoding UTF-8 \
     $(if $(findstring true,$(PRIVATE_WARNINGS_ENABLE)),$(xlint_unchecked),) \
     $(2) \
     $(addprefix -classpath ,$(strip \
@@ -2228,7 +2228,7 @@
     -extdirs "" -d $(PRIVATE_CLASS_INTERMEDIATES_DIR) \
     $(PRIVATE_JAVACFLAGS) \
     \@$(PRIVATE_CLASS_INTERMEDIATES_DIR)/java-source-list-uniq \
-    || ( rm -rf $(PRIVATE_CLASS_INTERMEDIATES_DIR) ; exit 41 ) ) 2>&1 | $(JAVAC_FILTER); \
+    || ( rm -rf $(PRIVATE_CLASS_INTERMEDIATES_DIR) ; exit 41 ) \
 fi
 $(if $(PRIVATE_JAVA_LAYERS_FILE), $(hide) build/tools/java-layers.py \
     $(PRIVATE_JAVA_LAYERS_FILE) \@$(PRIVATE_CLASS_INTERMEDIATES_DIR)/java-source-list-uniq,)
diff --git a/core/envsetup.mk b/core/envsetup.mk
index 456b0db..7919bd2 100644
--- a/core/envsetup.mk
+++ b/core/envsetup.mk
@@ -11,9 +11,65 @@
 #         This can be useful if you set OUT_DIR to be a different directory
 #         than other outputs of your build system.
 
+# Returns all words in $1 up to and including $2
+define find_and_earlier
+  $(strip $(if $(1),
+    $(firstword $(1))
+    $(if $(filter $(firstword $(1)),$(2)),,
+      $(call find_and_earlier,$(wordlist 2,$(words $(1)),$(1)),$(2)))))
+endef
+
+#$(warning $(call find_and_earlier,A B C,A))
+#$(warning $(call find_and_earlier,A B C,B))
+#$(warning $(call find_and_earlier,A B C,C))
+#$(warning $(call find_and_earlier,A B C,D))
+
+define version-list
+$(1)PR1 $(1)PD1 $(1)PD2 $(1)PM1 $(1)PM2
+endef
+
+ALL_VERSIONS := O P Q R S T U V W X Y Z
+ALL_VERSIONS := $(foreach v,$(ALL_VERSIONS),$(call version-list,$(v)))
+
+# Filters ALL_VERSIONS down to the range [$1, $2], and errors if $1 > $2 or $3 is
+# not in [$1, $2]
+# $(1): min platform version
+# $(2): max platform version
+# $(3): default platform version
+define allowed-platform-versions
+$(strip \
+  $(if $(filter $(ALL_VERSIONS),$(1)),,
+    $(error Invalid MIN_PLATFORM_VERSION '$(1)'))
+  $(if $(filter $(ALL_VERSIONS),$(2)),,
+    $(error Invalid MAX_PLATFORM_VERSION '$(2)'))
+  $(if $(filter $(ALL_VERSIONS),$(3)),,
+    $(error Invalid DEFAULT_PLATFORM_VERSION '$(3)'))
+
+  $(eval allowed_versions_ := $(call find_and_earlier,$(ALL_VERSIONS),$(2)))
+
+  $(if $(filter $(allowed_versions_),$(1)),,
+    $(error MIN_PLATFORM_VERSION '$(1)' must be before MAX_PLATFORM_VERSION '$(2)'))
+
+  $(eval allowed_versions_ := $(1) \
+    $(filter-out $(call find_and_earlier,$(allowed_versions_),$(1)),$(allowed_versions_)))
+
+  $(if $(filter $(allowed_versions_),$(3)),,
+    $(error DEFAULT_PLATFORM_VERSION '$(3)' must be between MIN_PLATFORM_VERSION '$(1)' and MAX_PLATFORM_VERSION '$(2)'))
+
+  $(allowed_versions_))
+endef
+
+#$(warning $(call allowed-platform-versions,OPR1,PPR1,OPR1))
+#$(warning $(call allowed-platform-versions,OPM1,PPR1,OPR1))
+
 # Set up version information.
 include $(BUILD_SYSTEM)/version_defaults.mk
 
+ENABLED_VERSIONS := $(call find_and_earlier,$(ALL_VERSIONS),$(TARGET_PLATFORM_VERSION))
+
+$(foreach v,$(ENABLED_VERSIONS), \
+  $(eval IS_AT_LEAST_$(v) := true))
+
 # ---------------------------------------------------------------
 # If you update the build system such that the environment setup
 # or buildspec.mk need to be updated, increment this number, and
@@ -203,6 +259,13 @@
   endif
 endif
 
+# Check BOARD_VNDK_VERSION
+ifdef BOARD_VNDK_VERSION
+  ifneq ($(BOARD_VNDK_VERSION),current)
+    $(error BOARD_VNDK_VERSION: Only "current" is implemented)
+  endif
+endif
+
 # ---------------------------------------------------------------
 # Set up configuration for target machine.
 # The following must be set:
diff --git a/core/host_dalvik_java_library.mk b/core/host_dalvik_java_library.mk
index ca45cef..85cd2d5 100644
--- a/core/host_dalvik_java_library.mk
+++ b/core/host_dalvik_java_library.mk
@@ -96,8 +96,6 @@
         $(full_java_lib_deps) \
         $(jar_manifest_file) \
         $(proto_java_sources_file_stamp) \
-        $(NORMALIZE_PATH) \
-        $(JAVAC_FILTER) \
         $(LOCAL_ADDITIONAL_DEPENDENCIES)
 	$(transform-host-java-to-package)
 
diff --git a/core/host_java_library.mk b/core/host_java_library.mk
index 3c68d39..cd12caa 100644
--- a/core/host_java_library.mk
+++ b/core/host_java_library.mk
@@ -74,7 +74,6 @@
         $(jar_manifest_file) \
         $(proto_java_sources_file_stamp) \
         $(NORMALIZE_PATH) \
-        $(JAVAC_FILTER) \
         $(LOCAL_ADDITIONAL_DEPENDENCIES)
 	$(transform-host-java-to-package)
 
diff --git a/core/jack-default.args b/core/jack-default.args
index 0232301..433bc53 100644
--- a/core/jack-default.args
+++ b/core/jack-default.args
@@ -5,3 +5,5 @@
 -D jack.reporter.level.file=error=--,warning=-
 --verbose error
 -D jack.jayce.cache=false
+-D jack.lambda.grouping-scope=package
+-D jack.lambda.simplify-stateless=true
diff --git a/core/java.mk b/core/java.mk
index d54bd0f..a64f1fb 100644
--- a/core/java.mk
+++ b/core/java.mk
@@ -456,7 +456,6 @@
         $(RenderScript_file_stamp) \
         $(proto_java_sources_file_stamp) \
         $(NORMALIZE_PATH) \
-        $(JAVAC_FILTER) \
         $(LOCAL_ADDITIONAL_DEPENDENCIES)
 	$(transform-java-to-classes.jar)
 
diff --git a/core/version_defaults.mk b/core/version_defaults.mk
index 563f86a..b7c93f0 100644
--- a/core/version_defaults.mk
+++ b/core/version_defaults.mk
@@ -38,52 +38,27 @@
   include $(INTERNAL_BUILD_ID_MAKEFILE)
 endif
 
-# Returns all words in $1 up to and including $2
-define find_and_earlier
-  $(strip $(if $(1),
-    $(firstword $(1))
-    $(if $(filter $(firstword $(1)),$(2)),,
-      $(call find_and_earlier,$(wordlist 2,$(words $(1)),$(1)),$(2)))))
-endef
-
-#$(warning $(call find_and_earlier,A B C,A))
-#$(warning $(call find_and_earlier,A B C,B))
-#$(warning $(call find_and_earlier,A B C,C))
-#$(warning $(call find_and_earlier,A B C,D))
-
-define version-list
-$(1)PR1 $(1)PD1 $(1)PD2 $(1)PM1 $(1)PM2
-endef
-
-ALL_VERSIONS := O P
-ALL_VERSIONS := $(foreach v,$(ALL_VERSIONS),$(call version-list,$(v)))
-
 DEFAULT_PLATFORM_VERSION := OPR1
+MIN_PLATFORM_VERSION := OPR1
+MAX_PLATFORM_VERSION := PPR1
 
-# HACK: forward P to PPR1 until the build server config is updated
-ifeq (P,$(TARGET_PLATFORM_VERSION))
-  TARGET_PLATFORM_VERSION := PPR1
-endif
+ALLOWED_VERSIONS := $(call allowed-platform-versions,\
+  $(MIN_PLATFORM_VERSION),\
+  $(MAX_PLATFORM_VERSION),\
+  $(DEFAULT_PLATFORM_VERSION))
 
-ifeq (,$(TARGET_PLATFORM_VERSION))
-  # Default targeted platform version
-  # TODO: PLATFORM_VERSION, PLATFORM_SDK_VERSION, etc. should be conditional
-  # on this
+ifndef TARGET_PLATFORM_VERSION
   TARGET_PLATFORM_VERSION := $(DEFAULT_PLATFORM_VERSION)
 endif
 
-ifeq (,$(filter $(ALL_VERSIONS), $(TARGET_PLATFORM_VERSION)))
-$(warning Invalid TARGET_PLATFORM_VERSION '$(TARGET_PLATFORM_VERSION)', must be one of)
-$(warning $(ALL_VERSIONS))
-$(error Stopping...)
+ifeq (,$(filter $(ALLOWED_VERSIONS), $(TARGET_PLATFORM_VERSION)))
+  $(warning Invalid TARGET_PLATFORM_VERSION '$(TARGET_PLATFORM_VERSION)', must be one of)
+  $(error $(ALLOWED_VERSIONS))
 endif
 
-ENABLED_VERSIONS := $(call find_and_earlier,$(ALL_VERSIONS),$(TARGET_PLATFORM_VERSION))
-
-$(foreach v,$(ENABLED_VERSIONS), \
-  $(eval IS_AT_LEAST_$(v) := true))
-
 # Default versions for each TARGET_PLATFORM_VERSION
+# TODO: PLATFORM_VERSION, PLATFORM_SDK_VERSION, etc. should be conditional
+# on this
 
 # This is the canonical definition of the platform version,
 # which is the version that we reveal to the end user.