diff --git a/core/Makefile b/core/Makefile
index 24302d4..f2d7585 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -487,6 +487,12 @@
   endif
 endif
 
+ifneq ($(BOARD_DO_NOT_STRIP_RECOVERY_MODULES),true)
+	RECOVERY_STRIPPED_MODULE_STAGING_DIR := $(call intermediates-dir-for,PACKAGING,depmod_recovery_stripped)
+else
+	RECOVERY_STRIPPED_MODULE_STAGING_DIR :=
+endif
+
 ifneq ($(BOARD_DO_NOT_STRIP_VENDOR_MODULES),true)
 	VENDOR_STRIPPED_MODULE_STAGING_DIR := $(call intermediates-dir-for,PACKAGING,depmod_vendor_stripped)
 else
@@ -501,7 +507,7 @@
 
 BOARD_KERNEL_MODULE_DIRS += top
 $(foreach kmd,$(BOARD_KERNEL_MODULE_DIRS), \
-  $(eval ALL_DEFAULT_INSTALLED_MODULES += $(call build-image-kernel-modules-dir,RECOVERY,$(TARGET_RECOVERY_ROOT_OUT),,modules.load.recovery,,$(kmd))) \
+  $(eval ALL_DEFAULT_INSTALLED_MODULES += $(call build-image-kernel-modules-dir,RECOVERY,$(TARGET_RECOVERY_ROOT_OUT),,modules.load.recovery,$(RECOVERY_STRIPPED_MODULE_STAGING_DIR),$(kmd))) \
   $(eval vendor_ramdisk_fragment := $(KERNEL_MODULE_DIR_VENDOR_RAMDISK_FRAGMENT_$(kmd))) \
   $(if $(vendor_ramdisk_fragment), \
     $(eval output_dir := $(VENDOR_RAMDISK_FRAGMENT.$(vendor_ramdisk_fragment).STAGING_DIR)) \
@@ -3283,7 +3289,8 @@
   $(call pretty,"Target odm fs image: $(INSTALLED_ODMIMAGE_TARGET)")
   @mkdir -p $(TARGET_OUT_ODM)
   @mkdir -p $(odmimage_intermediates) && rm -rf $(odmimage_intermediates)/odm_image_info.txt
-  $(call generate-userimage-prop-dictionary, $(odmimage_intermediates)/odm_image_info.txt, skip_fsck=true)
+  $(call generate-image-prop-dictionary, $(odmimage_intermediates)/odm_image_info.txt, odm, \
+	  skip_fsck=true)
   PATH=$(INTERNAL_USERIMAGES_BINARY_PATHS):$$PATH \
       $(BUILD_IMAGE) \
           $(TARGET_OUT_ODM) $(odmimage_intermediates)/odm_image_info.txt \
@@ -3334,7 +3341,8 @@
   $(call pretty,"Target vendor_dlkm fs image: $(INSTALLED_VENDOR_DLKMIMAGE_TARGET)")
   @mkdir -p $(TARGET_OUT_VENDOR_DLKM)
   @mkdir -p $(vendor_dlkmimage_intermediates) && rm -rf $(vendor_dlkmimage_intermediates)/vendor_dlkm_image_info.txt
-  $(call generate-userimage-prop-dictionary, $(vendor_dlkmimage_intermediates)/vendor_dlkm_image_info.txt, skip_fsck=true)
+  $(call generate-image-prop-dictionary, $(vendor_dlkmimage_intermediates)/vendor_dlkm_image_info.txt, \
+	  vendor_dlkm, skip_fsck=true)
   PATH=$(INTERNAL_USERIMAGES_BINARY_PATHS):$$PATH \
       $(BUILD_IMAGE) \
           $(TARGET_OUT_VENDOR_DLKM) $(vendor_dlkmimage_intermediates)/vendor_dlkm_image_info.txt \
@@ -3385,7 +3393,8 @@
   $(call pretty,"Target odm_dlkm fs image: $(INSTALLED_ODM_DLKMIMAGE_TARGET)")
   @mkdir -p $(TARGET_OUT_ODM_DLKM)
   @mkdir -p $(odm_dlkmimage_intermediates) && rm -rf $(odm_dlkmimage_intermediates)/odm_dlkm_image_info.txt
-  $(call generate-userimage-prop-dictionary, $(odm_dlkmimage_intermediates)/odm_dlkm_image_info.txt, skip_fsck=true)
+  $(call generate-image-prop-dictionary, $(odm_dlkmimage_intermediates)/odm_dlkm_image_info.txt, \
+	  odm_dlkm, skip_fsck=true)
   PATH=$(INTERNAL_USERIMAGES_BINARY_PATHS):$$PATH \
       $(BUILD_IMAGE) \
           $(TARGET_OUT_ODM_DLKM) $(odm_dlkmimage_intermediates)/odm_dlkm_image_info.txt \
@@ -4377,6 +4386,7 @@
   verity_signer \
   verity_verifier \
   zipalign \
+  zucchini \
 
 # Additional tools to unpack and repack the apex file.
 INTERNAL_OTATOOLS_MODULES += \
diff --git a/core/config.mk b/core/config.mk
index acdf15e..0b317fb 100644
--- a/core/config.mk
+++ b/core/config.mk
@@ -259,7 +259,7 @@
 
 define add_soong_config_namespace
 $(eval SOONG_CONFIG_NAMESPACES += $1) \
-$(eval SOONG_CONFIG_$1 :=)
+$(eval SOONG_CONFIG_$(strip $1) :=)
 endef
 
 # The add_soong_config_var function adds a a list of soong config variables to
@@ -268,8 +268,8 @@
 # $1 is the namespace. $2 is the list of variables.
 # Ex: $(call add_soong_config_var,acme,COOL_FEATURE_A COOL_FEATURE_B)
 define add_soong_config_var
-$(eval SOONG_CONFIG_$1 += $2) \
-$(foreach v,$2,$(eval SOONG_CONFIG_$1_$v := $($v)))
+$(eval SOONG_CONFIG_$(strip $1) += $2) \
+$(foreach v,$(strip $2),$(eval SOONG_CONFIG_$(strip $1)_$v := $($v)))
 endef
 
 # The add_soong_config_var_value function defines a make variable and also adds
@@ -1004,6 +1004,14 @@
 BOARD_PREBUILT_HIDDENAPI_DIR ?=
 .KATI_READONLY := BOARD_PREBUILT_HIDDENAPI_DIR
 
+ifdef USE_HOST_MUSL
+  ifneq (,$(or $(BUILD_BROKEN_USES_BUILD_HOST_EXECUTABLE),\
+               $(BUILD_BROKEN_USES_BUILD_HOST_SHARED_LIBRARY),\
+               $(BUILD_BROKEN_USES_BUILD_HOST_STATIC_LIBRARY)))
+    $(error USE_HOST_MUSL can't be set when native host builds are enabled in Make with BUILD_BROKEN_USES_BUILD_HOST_*)
+  endif
+endif
+
 # ###############################################################
 # Set up final options.
 # ###############################################################
diff --git a/core/main.mk b/core/main.mk
index 7b41ba2..e1cfead 100644
--- a/core/main.mk
+++ b/core/main.mk
@@ -1886,6 +1886,8 @@
   ifdef CLANG_COVERAGE
     $(foreach f,$(SOONG_NDK_API_XML), \
         $(call dist-for-goals,droidcore,$(f):ndk_apis/$(notdir $(f))))
+    $(foreach f,$(SOONG_CC_API_XML), \
+        $(call dist-for-goals,droidcore,$(f):cc_apis/$(notdir $(f))))
   endif
 
   # For full system build (whether unbundled or not), we configure
diff --git a/core/product_config.mk b/core/product_config.mk
index 7bed376..54fbb7d 100644
--- a/core/product_config.mk
+++ b/core/product_config.mk
@@ -87,6 +87,19 @@
 $(foreach f,$(1),$(f):$(2)/$(notdir $(f)))
 endef
 
+#
+# Convert the list of file names to the list of PRODUCT_COPY_FILES items
+# $(1): from pattern
+# $(2): to pattern
+# $(3): file names
+# E.g., calling product-copy-files-by-pattern with
+#   (from/%, to/%, a b)
+# returns
+#   from/a:to/a from/b:to/b
+define product-copy-files-by-pattern
+$(join $(patsubst %,$(1),$(3)),$(patsubst %,:$(2),$(3)))
+endef
+
 # ---------------------------------------------------------------
 # Check for obsolete PRODUCT- and APP- goals
 ifeq ($(CALLED_FROM_SETUP),true)
diff --git a/core/product_config.rbc b/core/product_config.rbc
index ef0d0c9..28b37a3 100644
--- a/core/product_config.rbc
+++ b/core/product_config.rbc
@@ -82,7 +82,7 @@
                     # Define SOONG_CONFIG_<ns> for Make, othewise
                     # it cannot be added to .KATI_READONLY list
                     if _options.format == "make":
-                        print("SOONG_CONFIG_" + nsname, ":=")
+                        print("SOONG_CONFIG_" + nsname, ":=", " ".join(nsvars.keys()))
                     for var, val in sorted(nsvars.items()):
                         __print_attr("SOONG_CONFIG_%s_%s" % (nsname, var), val)
             elif attr not in _globals_base:
@@ -439,7 +439,7 @@
     """Returns regular expression equivalent to Make pattern."""
 
     # TODO(asmundak): this will mishandle '\%'
-    return "^(" + "|".join([w.replace("%", ".*", 1) for w in words]) + ")"
+    return "^(" + "|".join([w.replace("%", ".*", 1) for w in words if w]) + ")$"
 
 def _regex_match(regex, w):
     return rblf_regex(regex, w)
diff --git a/core/soong_config.mk b/core/soong_config.mk
index d3f983c..a39707e 100644
--- a/core/soong_config.mk
+++ b/core/soong_config.mk
@@ -27,6 +27,7 @@
 $(call add_json_val,  Platform_sdk_version,              $(PLATFORM_SDK_VERSION))
 $(call add_json_str,  Platform_sdk_codename,             $(PLATFORM_VERSION_CODENAME))
 $(call add_json_bool, Platform_sdk_final,                $(filter REL,$(PLATFORM_VERSION_CODENAME)))
+$(call add_json_val,  Platform_sdk_extension_version,    $(PLATFORM_SDK_EXTENSION_VERSION))
 $(call add_json_csv,  Platform_version_active_codenames, $(PLATFORM_VERSION_ALL_CODENAMES))
 $(call add_json_str,  Platform_security_patch,           $(PLATFORM_SECURITY_PATCH))
 $(call add_json_str,  Platform_preview_sdk_version,      $(PLATFORM_PREVIEW_SDK_VERSION))
@@ -73,6 +74,7 @@
 $(call add_json_str,  HostArch,                          $(HOST_ARCH))
 $(call add_json_str,  HostSecondaryArch,                 $(HOST_2ND_ARCH))
 $(call add_json_bool, HostStaticBinaries,                $(BUILD_HOST_static))
+$(call add_json_bool, HostMusl,                          $(USE_HOST_MUSL))
 
 $(call add_json_str,  CrossHost,                         $(HOST_CROSS_OS))
 $(call add_json_str,  CrossHostArch,                     $(HOST_CROSS_ARCH))
diff --git a/core/tasks/tools/build_custom_image.mk b/core/tasks/tools/build_custom_image.mk
index 8b766ae..f9ae2c1 100644
--- a/core/tasks/tools/build_custom_image.mk
+++ b/core/tasks/tools/build_custom_image.mk
@@ -57,13 +57,15 @@
 my_kernel_module_copy_files :=
 my_custom_image_modules_var := BOARD_$(strip $(call to-upper,$(my_custom_image_name)))_KERNEL_MODULES
 ifdef $(my_custom_image_modules_var)
-  my_kernel_module_copy_files += $(call build-image-kernel-modules,$($(my_custom_image_modules_var)),$(my_staging_dir),$(CUSTOM_IMAGE_MOUNT_POINT),$(call intermediates-dir-for,PACKAGING,depmod_$(my_custom_image_name)),$($(my_custom_image_modules_var)),modules.load,,$(call intermediates-dir-for,PACKAGING,depmod_$(my_custom_image_name)_stripped))
-  my_copy_pairs += $(my_kernel_module_copy_files)
+$(foreach kmod,\
+  $(call build-image-kernel-modules,$($(my_custom_image_modules_var)),$(my_staging_dir),$(CUSTOM_IMAGE_MOUNT_POINT),$(call intermediates-dir-for,PACKAGING,depmod_$(my_custom_image_name)),$($(my_custom_image_modules_var)),modules.load,,$(call intermediates-dir-for,PACKAGING,depmod_$(my_custom_image_name)_stripped)),\
+  $(eval pair := $(subst :,$(space),$(kmod)))\
+  $(eval my_kernel_module_copy_files += $(word 1,$(pair)):$(subst $(my_staging_dir)/,,$(word 2,$(pair)))))
 endif
 
 # Collect CUSTOM_IMAGE_COPY_FILES.
 my_image_copy_files :=
-$(foreach f,$(CUSTOM_IMAGE_COPY_FILES),\
+$(foreach f,$(CUSTOM_IMAGE_COPY_FILES) $(my_kernel_module_copy_files),\
   $(eval pair := $(subst :,$(space),$(f)))\
   $(eval src := $(word 1,$(pair)))\
   $(eval my_image_copy_files += $(src))\
diff --git a/core/version_defaults.mk b/core/version_defaults.mk
index 530bbff..a358005 100644
--- a/core/version_defaults.mk
+++ b/core/version_defaults.mk
@@ -156,6 +156,12 @@
 endif
 .KATI_READONLY := PLATFORM_SDK_VERSION
 
+# This is the sdk extension version of this tree.
+PLATFORM_SDK_EXTENSION_VERSION :=$= 0
+
+# This is the sdk extension version that PLATFORM_SDK_VERSION ships with.
+PLATFORM_BASE_SDK_EXTENSION_VERSION :=$= 0
+
 ifeq (REL,$(PLATFORM_VERSION_CODENAME))
   PLATFORM_PREVIEW_SDK_VERSION := 0
 else
diff --git a/envsetup.sh b/envsetup.sh
index 77b2247..6085f7a 100644
--- a/envsetup.sh
+++ b/envsetup.sh
@@ -1661,12 +1661,19 @@
     if [ -n "$ncolors" ] && [ $ncolors -ge 8 ]; then
         color_failed=$'\E'"[0;31m"
         color_success=$'\E'"[0;32m"
+        color_warning=$'\E'"[0;33m"
         color_reset=$'\E'"[00m"
     else
         color_failed=""
         color_success=""
         color_reset=""
     fi
+
+    if [[ "x${USE_RBE}" == "x" && $mins -gt 15 && "${ANDROID_BUILD_ENVIRONMENT_CONFIG}" == "googler" ]]; then
+        echo
+        echo "${color_warning}Start using RBE (http://go/build-fast) to get faster builds!${color_reset}"
+    fi
+
     echo
     if [ $ret -eq 0 ] ; then
         echo -n "${color_success}#### build completed successfully "
diff --git a/tests/run.rbc b/tests/run.rbc
index 4d7166a..2c15b81 100644
--- a/tests/run.rbc
+++ b/tests/run.rbc
@@ -47,6 +47,9 @@
 assert_eq(["foo/%"], rblf.mkpatsubst("%", "%/%", ["foo"]))
 assert_eq(["from/a:to/a", "from/b:to/b"], rblf.product_copy_files_by_pattern("from/%", "to/%", "a b"))
 
+assert_eq([], rblf.filter(["a", "", "b"], "f"))
+assert_eq(["", "b"], rblf.filter_out(["a", "" ], ["a", "", "b"] ))
+
 globals, config = rblf.product_configuration("test/device", init)
 assert_eq(
     {
diff --git a/tools/releasetools/ota_from_target_files.py b/tools/releasetools/ota_from_target_files.py
index 366b51a..40da34d 100755
--- a/tools/releasetools/ota_from_target_files.py
+++ b/tools/releasetools/ota_from_target_files.py
@@ -221,6 +221,10 @@
       For VABC downgrades, we must finish merging before doing data wipe, and
       since data wipe is required for downgrading OTA, this might cause long
       wait time in recovery.
+
+  --enable_vabc_xor
+      Enable the VABC xor feature. Will reduce space requirements for OTA
+
 """
 
 from __future__ import print_function
@@ -286,7 +290,7 @@
 OPTIONS.disable_vabc = False
 OPTIONS.spl_downgrade = False
 OPTIONS.vabc_downgrade = False
-OPTIONS.enable_vabc_xor = False
+OPTIONS.enable_vabc_xor = True
 
 POSTINSTALL_CONFIG = 'META/postinstall_config.txt'
 DYNAMIC_PARTITION_INFO = 'META/dynamic_partitions_info.txt'
@@ -1116,6 +1120,8 @@
     target_info.info_dict['ab_partitions'] = zfp.read(
         AB_PARTITIONS).decode().strip().split("\n")
 
+  CheckVintfIfTrebleEnabled(target_file, target_info)
+
   # Metadata to comply with Android OTA package format.
   metadata = GetPackageMetadata(target_info, source_info)
   # Generate payload.
@@ -1200,8 +1206,6 @@
 
   common.ZipClose(target_zip)
 
-  CheckVintfIfTrebleEnabled(target_file, target_info)
-
   # We haven't written the metadata entry yet, which will be handled in
   # FinalizeMetadata().
   common.ZipClose(output_zip)
@@ -1312,7 +1316,7 @@
     elif o == "--vabc_downgrade":
       OPTIONS.vabc_downgrade = True
     elif o == "--enable_vabc_xor":
-      OPTIONS.enable_vabc_xor = True
+      OPTIONS.enable_vabc_xor = a.lower() != "false"
     else:
       return False
     return True
@@ -1357,7 +1361,7 @@
                                  "disable_vabc",
                                  "spl_downgrade",
                                  "vabc_downgrade",
-                                 "enable_vabc_xor",
+                                 "enable_vabc_xor=",
                              ], extra_option_handler=option_handler)
 
   if len(args) != 2: