diff --git a/core/aux_config.mk b/core/aux_config.mk
index 41c14ae..bdae86a 100644
--- a/core/aux_config.mk
+++ b/core/aux_config.mk
@@ -102,10 +102,10 @@
 $(eval AUX_OS_VARIANT_LIST_$(AUX_OS_$(1)):=) \
 $(call aux-variant-setup-paths,$(_name)) \
 $(eval AUX_ALL_VARIANTS += $(_name)) \
-$(eval AUX_ALL_OSES := $(filterout $(AUX_OS_$(_name)),$(AUX_ALL_OSES)) $(AUX_OS_$(_name))) \
-$(eval AUX_ALL_CPUS := $(filterout $(AUX_CPU_$(_name)),$(AUX_ALL_CPUS)) $(AUX_CPU_$(_name))) \
-$(eval AUX_ALL_ARCHS := $(filterout $(AUX_ARCH_$(_name)),$(AUX_ALL_ARCHS)) $(AUX_ARCH_$(_name))) \
-$(eval AUX_ALL_SUBARCHS := $(filterout $(AUX_SUBARCH_$(_name)),$(AUX_ALL_SUBARCHS)) $(AUX_SUBARCH_$(_name)))
+$(eval AUX_ALL_OSES := $(filter-out $(AUX_OS_$(_name)),$(AUX_ALL_OSES)) $(AUX_OS_$(_name))) \
+$(eval AUX_ALL_CPUS := $(filter-out $(AUX_CPU_$(_name)),$(AUX_ALL_CPUS)) $(AUX_CPU_$(_name))) \
+$(eval AUX_ALL_ARCHS := $(filter-out $(AUX_ARCH_$(_name)),$(AUX_ALL_ARCHS)) $(AUX_ARCH_$(_name))) \
+$(eval AUX_ALL_SUBARCHS := $(filter-out $(AUX_SUBARCH_$(_name)),$(AUX_ALL_SUBARCHS)) $(AUX_SUBARCH_$(_name)))
 endef
 
 # Load system configuration referenced by AUX variant config;
@@ -138,7 +138,7 @@
 $(eval _all:=) \
 $(eval _req:=$(addsuffix _$(1),$(aux_env))) \
 $(foreach var,$(_req),$(eval _all += $(var))) \
-$(eval _missing := $(filterout $(_all),$(_req))) \
+$(eval _missing := $(filter-out $(_all),$(_req))) \
 $(if $(_missing),$(error AUX variant $(1) must define vars: $(_missing)))
 endef
 
diff --git a/core/config.mk b/core/config.mk
index 37ab875..d0a4af5 100644
--- a/core/config.mk
+++ b/core/config.mk
@@ -840,7 +840,7 @@
 ifdef DEVICE_FRAMEWORK_MANIFEST_FILE
   FRAMEWORK_MANIFEST_INPUT_FILES += $(DEVICE_FRAMEWORK_MANIFEST_FILE)
 endif
-$(.KATI_obsolete_var DEVICE_FRAMEWORK_MANIFEST_FILE,No one should ever need to use this.)
+$(KATI_obsolete_var DEVICE_FRAMEWORK_MANIFEST_FILE,No one should ever need to use this.)
 
 BUILD_NUMBER_FROM_FILE := $$(cat $(OUT_DIR)/build_number.txt)
 BUILD_DATETIME_FROM_FILE := $$(cat $(OUT_DIR)/build_date.txt)
diff --git a/core/definitions.mk b/core/definitions.mk
index 6ccb82b..2be4f59 100644
--- a/core/definitions.mk
+++ b/core/definitions.mk
@@ -1723,6 +1723,10 @@
 $(if $(PRIVATE_ALL_OBJECTS),,$(hide) $($(PRIVATE_2ND_ARCH_VAR_PREFIX)$(PRIVATE_PREFIX)AR) d $(1) $(dir $(1))dummy.o \
   && rm -f $(dir $(1))dummy.o)
 endef
+else
+create-dummy.o-if-no-objs =
+get-dummy.o-if-no-objs =
+delete-dummy.o-if-no-objs =
 endif  # HOST_OS is darwin
 
 # Explicitly delete the archive first so that ar doesn't
diff --git a/core/executable_internal.mk b/core/executable_internal.mk
index 0aec275..4a62fbf 100644
--- a/core/executable_internal.mk
+++ b/core/executable_internal.mk
@@ -12,7 +12,9 @@
 LOCAL_MODULE_SUFFIX := $(TARGET_EXECUTABLE_SUFFIX)
 endif
 
+ifdef target-executable-hook
 $(call target-executable-hook)
+endif
 
 skip_build_from_source :=
 ifdef LOCAL_PREBUILT_MODULE_FILE
diff --git a/core/host_executable_internal.mk b/core/host_executable_internal.mk
index 19200fd..c4f9f66 100644
--- a/core/host_executable_internal.mk
+++ b/core/host_executable_internal.mk
@@ -12,7 +12,9 @@
 LOCAL_MODULE_SUFFIX := $($(my_prefix)EXECUTABLE_SUFFIX)
 endif
 
+ifdef host-executable-hook
 $(call host-executable-hook)
+endif
 
 skip_build_from_source :=
 ifdef LOCAL_PREBUILT_MODULE_FILE
diff --git a/core/host_shared_library_internal.mk b/core/host_shared_library_internal.mk
index 5e199cc..0a3b317 100644
--- a/core/host_shared_library_internal.mk
+++ b/core/host_shared_library_internal.mk
@@ -20,7 +20,9 @@
 $(error $(LOCAL_PATH): Cannot set module stem for a library)
 endif
 
+ifdef host-shared-library-hook
 $(call host-shared-library-hook)
+endif
 
 skip_build_from_source :=
 ifdef LOCAL_PREBUILT_MODULE_FILE
diff --git a/core/shared_library_internal.mk b/core/shared_library_internal.mk
index 687536b..ab887e0 100644
--- a/core/shared_library_internal.mk
+++ b/core/shared_library_internal.mk
@@ -20,7 +20,9 @@
 $(error $(LOCAL_PATH): Cannot set module stem for a library)
 endif
 
+ifdef target-shared-library-hook
 $(call target-shared-library-hook)
+endif
 
 skip_build_from_source :=
 ifdef LOCAL_PREBUILT_MODULE_FILE