diff --git a/core/config.mk b/core/config.mk
index 42f6148..4e785bc 100644
--- a/core/config.mk
+++ b/core/config.mk
@@ -129,11 +129,7 @@
 # Parse out any modifier targets.
 # ###############################################################
 
-# The 'showcommands' goal says to show the full command
-# lines being executed, instead of a short message about
-# the kind of operation being done.
-SHOW_COMMANDS:= $(filter showcommands,$(MAKECMDGOALS))
-hide := $(if $(SHOW_COMMANDS),,@)
+hide := @
 
 ################################################################
 # Tools needed in product configuration makefiles.
@@ -824,10 +820,10 @@
 RS_PREBUILT_CLCORE := prebuilts/sdk/renderscript/lib/$(TARGET_ARCH)/librsrt_$(TARGET_ARCH).bc
 RS_PREBUILT_COMPILER_RT := prebuilts/sdk/renderscript/lib/$(TARGET_ARCH)/libcompiler_rt.a
 ifeq (true,$(TARGET_IS_64_BIT))
-RS_PREBUILT_LIBPATH := -L prebuilts/ndk/current/platforms/android-21/arch-$(TARGET_ARCH)/usr/lib64 \
-                       -L prebuilts/ndk/current/platforms/android-21/arch-$(TARGET_ARCH)/usr/lib
+RS_PREBUILT_LIBPATH := -L prebuilts/ndk/r10/platforms/android-21/arch-$(TARGET_ARCH)/usr/lib64 \
+                       -L prebuilts/ndk/r10/platforms/android-21/arch-$(TARGET_ARCH)/usr/lib
 else
-RS_PREBUILT_LIBPATH := -L prebuilts/ndk/current/platforms/android-9/arch-$(TARGET_ARCH)/usr/lib
+RS_PREBUILT_LIBPATH := -L prebuilts/ndk/r10/platforms/android-9/arch-$(TARGET_ARCH)/usr/lib
 endif
 
 # API Level lists for Renderscript Compat lib.
diff --git a/core/definitions.mk b/core/definitions.mk
index 63b123e..b76b434 100644
--- a/core/definitions.mk
+++ b/core/definitions.mk
@@ -1049,8 +1049,9 @@
 	$(dir $@)/$(notdir $(<:.bc=.o)) \
 	$(RS_PREBUILT_COMPILER_RT) \
 	-o $@ $(TARGET_GLOBAL_LDFLAGS) -Wl,--hash-style=sysv -L prebuilts/gcc/ \
-	$(RS_PREBUILT_LIBPATH) -L $(TARGET_OUT_INTERMEDIATE_LIBRARIES) \
-	-lRSSupport -lm -lc
+	$(RS_PREBUILT_LIBPATH) \
+	$(call intermediates-dir-for,SHARED_LIBRARIES,libRSSupport)/libRSSupport.so \
+	-lm -lc
 endef
 
 ###########################################################
@@ -2531,6 +2532,7 @@
 $(if $(filter $(1),$(PLATFORM_VERSION_CODENAME)),10000,$(1))
 endef
 
+# --add-opens is required because desugar reflects via java.lang.invoke.MethodHandles.Lookup
 define desugar-classes-jar
 @echo Desugar: $@
 @mkdir -p $(dir $@)
@@ -2538,6 +2540,7 @@
 @rm -rf $(dir $@)/desugar_dumped_classes
 @mkdir $(dir $@)/desugar_dumped_classes
 $(hide) java \
+    $(if $(EXPERIMENTAL_USE_OPENJDK9),--add-opens java.base/java.lang.invoke=ALL-UNNAMED,) \
     -Djdk.internal.lambda.dumpProxyClasses=$(abspath $(dir $@))/desugar_dumped_classes \
     -jar $(DESUGAR) \
     $(addprefix --bootclasspath_entry ,$(call desugar-bootclasspath,$(PRIVATE_BOOTCLASSPATH))) \
@@ -2691,10 +2694,14 @@
 $(call sign-package-arg,$@)
 endef
 
+# signapk uses internal APIs from sun.security.{pkcs,x509}; see http://b/37137869
 # $(1): the package file we are signing.
 define sign-package-arg
 $(hide) mv $(1) $(1).unsigned
-$(hide) java -Djava.library.path=$(SIGNAPK_JNI_LIBRARY_PATH) -jar $(SIGNAPK_JAR) \
+$(hide) java -Djava.library.path=$(SIGNAPK_JNI_LIBRARY_PATH) \
+    $(if $(EXPERIMENTAL_USE_OPENJDK9),--add-exports java.base/sun.security.pkcs=ALL-UNNAMED,) \
+    $(if $(EXPERIMENTAL_USE_OPENJDK9),--add-exports java.base/sun.security.x509=ALL-UNNAMED,) \
+    -jar $(SIGNAPK_JAR) \
     $(PRIVATE_CERTIFICATE) $(PRIVATE_PRIVATE_KEY) \
     $(PRIVATE_ADDITIONAL_CERTIFICATES) $(1).unsigned $(1).signed
 $(hide) mv $(1).signed $(1)
diff --git a/core/distdir.mk b/core/distdir.mk
index 51ec46e..89c5966 100644
--- a/core/distdir.mk
+++ b/core/distdir.mk
@@ -17,16 +17,8 @@
 # When specifying "dist", the user has asked that we copy the important
 # files from this build into DIST_DIR.
 
-.PHONY: dist
-dist: ;
-
 dist_goal := $(strip $(filter dist,$(MAKECMDGOALS)))
 MAKECMDGOALS := $(strip $(filter-out dist,$(MAKECMDGOALS)))
-ifeq (,$(strip $(filter-out $(INTERNAL_MODIFIER_TARGETS),$(MAKECMDGOALS))))
-# The commandline was something like "make dist" or "make dist showcommands".
-# Add a dependency on a real target.
-dist: $(DEFAULT_GOAL)
-endif
 
 ifdef dist_goal
 
diff --git a/core/envsetup.mk b/core/envsetup.mk
index ccd156b..08b2321 100644
--- a/core/envsetup.mk
+++ b/core/envsetup.mk
@@ -84,6 +84,9 @@
 ifneq ($(TARGET_BUILD_APPS),)
 ALLOW_MISSING_DEPENDENCIES := true
 endif
+ifeq ($(TARGET_BUILD_PDK),true)
+ALLOW_MISSING_DEPENDENCIES := true
+endif
 ifneq ($(filter true,$(SOONG_ALLOW_MISSING_DEPENDENCIES)),)
 ALLOW_MISSING_DEPENDENCIES := true
 endif
diff --git a/core/main.mk b/core/main.mk
index 1ca2b0a..62a9c5f 100644
--- a/core/main.mk
+++ b/core/main.mk
@@ -91,7 +91,7 @@
 # These are the modifier targets that don't do anything themselves, but
 # change the behavior of the build.
 # (must be defined before including definitions.make)
-INTERNAL_MODIFIER_TARGETS := showcommands all
+INTERNAL_MODIFIER_TARGETS := all
 
 # EMMA_INSTRUMENT_STATIC merges the static emma library to each emma-enabled module.
 ifeq (true,$(EMMA_INSTRUMENT_STATIC))
@@ -326,7 +326,7 @@
 endif
 
 
-# If they only used the modifier goals (showcommands, etc), we'll actually
+# If they only used the modifier goals (all, etc), we'll actually
 # build the default target.
 ifeq ($(filter-out $(INTERNAL_MODIFIER_TARGETS),$(MAKECMDGOALS)),)
 .PHONY: $(INTERNAL_MODIFIER_TARGETS)
@@ -1127,10 +1127,6 @@
 	@echo "$(call module-names-for-tag-list,$(ALL_MODULE_TAGS))" | \
 	      tr -s ' ' '\n' | sort -u | $(COLUMN)
 
-.PHONY: showcommands
-showcommands:
-	@echo >/dev/null
-
 .PHONY: nothing
 nothing:
 	@echo Successfully read the makefiles.
diff --git a/core/ninja_config.mk b/core/ninja_config.mk
index f456b8b..ca2dcee 100644
--- a/core/ninja_config.mk
+++ b/core/ninja_config.mk
@@ -7,18 +7,14 @@
 KATI_OUTPUT_PATTERNS := $(OUT_DIR)/build%.ninja $(OUT_DIR)/ninja%.sh
 
 # Modifier goals we don't need to pass to Ninja.
-NINJA_EXCLUDE_GOALS := showcommands all dist
-.PHONY : $(NINJA_EXCLUDE_GOALS)
+NINJA_EXCLUDE_GOALS := all dist APP-% PRODUCT-%
 
 # A list of goals which affect parsing of makefiles and we need to pass to Kati.
 PARSE_TIME_MAKE_GOALS := \
 	$(PARSE_TIME_MAKE_GOALS) \
 	$(dont_bother_goals) \
 	all \
-	APP-% \
-	DUMP_% \
 	ECLIPSE-% \
-	PRODUCT-% \
 	AUX-% \
 	boottarball-nodeps \
 	brillo_tests \
@@ -67,5 +63,8 @@
     $(sort $(ORIGINAL_MAKECMDGOALS) $(MAKECMDGOALS)))
 # Goals we need to pass to Ninja.
 NINJA_GOALS := $(filter-out $(NINJA_EXCLUDE_GOALS), $(ANDROID_GOALS))
+ifndef NINJA_GOALS
+  NINJA_GOALS := droid
+endif
 # Goals we need to pass to Kati.
-KATI_GOALS := $(filter $(PARSE_TIME_MAKE_GOALS),  $(ANDROID_GOALS))
+KATI_GOALS := $(filter $(PARSE_TIME_MAKE_GOALS), $(ANDROID_GOALS))
diff --git a/core/product_config.mk b/core/product_config.mk
index e069ff1..3623aa6 100644
--- a/core/product_config.mk
+++ b/core/product_config.mk
@@ -88,6 +88,7 @@
 # Provide "PRODUCT-<prodname>-<goal>" targets, which lets you build
 # a particular configuration without needing to set up the environment.
 #
+ifndef KATI
 product_goals := $(strip $(filter PRODUCT-%,$(MAKECMDGOALS)))
 ifdef product_goals
   # Scrape the product and build names out of the goal,
@@ -113,54 +114,42 @@
     $(error "tests" has been deprecated as a build variant. Use it as a build goal instead.)
   endif
 
-  # The build server wants to do make PRODUCT-dream-installclean
-  # which really means TARGET_PRODUCT=dream make installclean.
+  # The build server wants to do make PRODUCT-dream-sdk
+  # which really means TARGET_PRODUCT=dream make sdk.
   ifneq ($(filter-out $(INTERNAL_VALID_VARIANTS),$(TARGET_BUILD_VARIANT)),)
-    MAKECMDGOALS := $(MAKECMDGOALS) $(TARGET_BUILD_VARIANT)
+    override MAKECMDGOALS := $(MAKECMDGOALS) $(TARGET_BUILD_VARIANT)
     TARGET_BUILD_VARIANT := userdebug
     default_goal_substitution :=
   else
-    default_goal_substitution := $(DEFAULT_GOAL)
+    default_goal_substitution := droid
   endif
 
   # Replace the PRODUCT-* goal with the build goal that it refers to.
   # Note that this will ensure that it appears in the same relative
   # position, in case it matters.
-  #
-  # Note that modifying this will not affect the goals that make will
-  # attempt to build, but it's important because we inspect this value
-  # in certain situations (like for "make sdk").
-  #
-  MAKECMDGOALS := $(patsubst $(goal_name),$(default_goal_substitution),$(MAKECMDGOALS))
-
-  # Define a rule for the PRODUCT-* goal, and make it depend on the
-  # patched-up command-line goals as well as any other goals that we
-  # want to force.
-  #
-.PHONY: $(goal_name)
-$(goal_name): $(MAKECMDGOALS)
+  override MAKECMDGOALS := $(patsubst $(goal_name),$(default_goal_substitution),$(MAKECMDGOALS))
 endif
+endif # !KATI
 # else: Use the value set in the environment or buildspec.mk.
 
 # ---------------------------------------------------------------
 # Provide "APP-<appname>" targets, which lets you build
 # an unbundled app.
 #
+ifndef KATI
 unbundled_goals := $(strip $(filter APP-%,$(MAKECMDGOALS)))
 ifdef unbundled_goals
   ifneq ($(words $(unbundled_goals)),1)
     $(error Only one APP-* goal may be specified; saw "$(unbundled_goals)")
   endif
   TARGET_BUILD_APPS := $(strip $(subst -, ,$(patsubst APP-%,%,$(unbundled_goals))))
-  ifneq ($(filter $(DEFAULT_GOAL),$(MAKECMDGOALS)),)
-    MAKECMDGOALS := $(patsubst $(unbundled_goals),,$(MAKECMDGOALS))
+  ifneq ($(filter droid,$(MAKECMDGOALS)),)
+    override MAKECMDGOALS := $(patsubst $(unbundled_goals),,$(MAKECMDGOALS))
   else
-    MAKECMDGOALS := $(patsubst $(unbundled_goals),$(DEFAULT_GOAL),$(MAKECMDGOALS))
+    override MAKECMDGOALS := $(patsubst $(unbundled_goals),droid,$(MAKECMDGOALS))
   endif
-
-.PHONY: $(unbundled_goals)
-$(unbundled_goals): $(MAKECMDGOALS)
 endif # unbundled_goals
+endif
 
 # Default to building dalvikvm on hosts that support it...
 ifeq ($(HOST_OS),linux)
diff --git a/core/soong_config.mk b/core/soong_config.mk
index 977b35c..e21083d 100644
--- a/core/soong_config.mk
+++ b/core/soong_config.mk
@@ -81,6 +81,7 @@
 	echo '    "Device_uses_hwc2": $(if $(filter true,$(TARGET_USES_HWC2)),true,false),'; \
 	echo '    "Override_rs_driver": "$(OVERRIDE_RS_DRIVER)",'; \
 	echo '    "Treble": $(if $(filter true,$(PRODUCT_FULL_TREBLE)),true,false),'; \
+	echo '    "Pdk": $(if $(filter true,$(TARGET_BUILD_PDK)),true,false),'; \
 	echo ''; \
 	echo '    "ArtUseReadBarrier": $(if $(filter false,$(PRODUCT_ART_USE_READ_BARRIER)),false,true),'; \
 	echo ''; \