diff --git a/Changes.md b/Changes.md
index 8979e30..daebd52 100644
--- a/Changes.md
+++ b/Changes.md
@@ -1,5 +1,21 @@
 # Build System Changes for Android.mk Writers
 
+## Python 2 to 3 migration
+
+The path set when running builds now makes the `python` executable point to python 3,
+whereas on previous versions it pointed to python 2. If you still have python 2 scripts,
+you can change the shebang line to use `python2` explicitly. This only applies for
+scripts run directly from makefiles, or from soong genrules. This behavior can be
+temporarily overridden by setting the `BUILD_BROKEN_PYTHON_IS_PYTHON2` environment
+variable to `true`. It's only an environment variable and not a product config variable
+because product config sometimes calls python code.
+
+In addition, `python_*` soong modules no longer allow python 2. This can be temporarily
+overridden by setting the `BUILD_BROKEN_USES_SOONG_PYTHON2_MODULES` product configuration
+variable to `true`.
+
+Python 2 is slated for complete removal in V.
+
 ## Stop referencing sysprop_library directly from cc modules
 
 For the migration to Bazel, we are no longer mapping sysprop_library targets
@@ -818,7 +834,7 @@
 
 ### Stop using clang property
 
-Clang has been deleted from Soong. To fix any build errors, remove the clang
+The clang property has been deleted from Soong. To fix any build errors, remove the clang
 property from affected Android.bp files using bpmodify.
 
 
diff --git a/core/Makefile b/core/Makefile
index dec2e0c..b501c07 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -3154,11 +3154,14 @@
 SYSTEM_LINKER_CONFIG := $(TARGET_OUT)/etc/linker.config.pb
 SYSTEM_LINKER_CONFIG_SOURCE := $(call intermediates-dir-for,ETC,system_linker_config)/system_linker_config
 $(SYSTEM_LINKER_CONFIG): PRIVATE_SYSTEM_LINKER_CONFIG_SOURCE := $(SYSTEM_LINKER_CONFIG_SOURCE)
-$(SYSTEM_LINKER_CONFIG) : $(INTERNAL_SYSTEMIMAGE_FILES) $(SYSTEM_LINKER_CONFIG_SOURCE) | conv_linker_config
+$(SYSTEM_LINKER_CONFIG): $(INTERNAL_SYSTEMIMAGE_FILES) $(SYSTEM_LINKER_CONFIG_SOURCE) | conv_linker_config
+	@echo Creating linker config: $@
+	@mkdir -p $(dir $@)
+	@rm -f $@
 	$(HOST_OUT_EXECUTABLES)/conv_linker_config systemprovide --source $(PRIVATE_SYSTEM_LINKER_CONFIG_SOURCE) \
-	  --output $@ --value "$(STUB_LIBRARIES)" --system "$(TARGET_OUT)"
+		--output $@ --value "$(STUB_LIBRARIES)" --system "$(TARGET_OUT)"
 	$(HOST_OUT_EXECUTABLES)/conv_linker_config append --source $@ --output $@ --key requireLibs \
-	 --value "$(foreach lib,$(LLNDK_MOVED_TO_APEX_LIBRARIES), $(lib).so)"
+		--value "$(foreach lib,$(LLNDK_MOVED_TO_APEX_LIBRARIES), $(lib).so)"
 
 $(call declare-1p-target,$(SYSTEM_LINKER_CONFIG),)
 $(call declare-license-deps,$(SYSTEM_LINKER_CONFIG),$(INTERNAL_SYSTEMIMAGE_FILES) $(SYSTEM_LINKER_CONFIG_SOURCE))
@@ -3541,6 +3544,9 @@
 vendor_linker_config_file := $(TARGET_OUT_VENDOR)/etc/linker.config.pb
 $(vendor_linker_config_file): private_linker_config_fragments := $(PRODUCT_VENDOR_LINKER_CONFIG_FRAGMENTS)
 $(vendor_linker_config_file): $(INTERNAL_VENDORIMAGE_FILES) $(PRODUCT_VENDOR_LINKER_CONFIG_FRAGMENTS) | $(HOST_OUT_EXECUTABLES)/conv_linker_config
+	@echo Creating linker config: $@
+	@mkdir -p $(dir $@)
+	@rm -f $@
 	$(HOST_OUT_EXECUTABLES)/conv_linker_config proto \
 		--source $(call normalize-path-list,$(private_linker_config_fragments)) \
 		--output $@
diff --git a/core/board_config.mk b/core/board_config.mk
index 70c91a8..af05973 100644
--- a/core/board_config.mk
+++ b/core/board_config.mk
@@ -188,6 +188,7 @@
   BUILD_BROKEN_PREBUILT_ELF_FILES \
   BUILD_BROKEN_TREBLE_SYSPROP_NEVERALLOW \
   BUILD_BROKEN_USES_NETWORK \
+  BUILD_BROKEN_USES_SOONG_PYTHON2_MODULES \
   BUILD_BROKEN_VENDOR_PROPERTY_NAMESPACE \
   BUILD_BROKEN_VINTF_PRODUCT_COPY_FILES \
 
diff --git a/core/soong_app_prebuilt.mk b/core/soong_app_prebuilt.mk
index 583788d..dd550b5 100644
--- a/core/soong_app_prebuilt.mk
+++ b/core/soong_app_prebuilt.mk
@@ -162,19 +162,21 @@
 # embedded JNI will already have been handled by soong
 my_embed_jni :=
 my_prebuilt_jni_libs :=
-ifdef LOCAL_SOONG_JNI_LIBS_$(TARGET_ARCH)
-  my_2nd_arch_prefix :=
-  LOCAL_JNI_SHARED_LIBRARIES := $(LOCAL_SOONG_JNI_LIBS_$(TARGET_ARCH))
-  partition_lib_pairs :=  $(LOCAL_SOONG_JNI_LIBS_PARTITION_$(TARGET_ARCH))
-  include $(BUILD_SYSTEM)/install_jni_libs_internal.mk
-endif
-ifdef TARGET_2ND_ARCH
-  ifdef LOCAL_SOONG_JNI_LIBS_$(TARGET_2ND_ARCH)
-    my_2nd_arch_prefix := $(TARGET_2ND_ARCH_VAR_PREFIX)
-    LOCAL_JNI_SHARED_LIBRARIES := $(LOCAL_SOONG_JNI_LIBS_$(TARGET_2ND_ARCH))
-    partition_lib_pairs :=  $(LOCAL_SOONG_JNI_LIBS_PARTITION_$(TARGET_2ND_ARCH))
+ifneq (true,$(LOCAL_UNINSTALLABLE_MODULE))
+  ifdef LOCAL_SOONG_JNI_LIBS_$(TARGET_ARCH)
+    my_2nd_arch_prefix :=
+    LOCAL_JNI_SHARED_LIBRARIES := $(LOCAL_SOONG_JNI_LIBS_$(TARGET_ARCH))
+    partition_lib_pairs :=  $(LOCAL_SOONG_JNI_LIBS_PARTITION_$(TARGET_ARCH))
     include $(BUILD_SYSTEM)/install_jni_libs_internal.mk
   endif
+  ifdef TARGET_2ND_ARCH
+    ifdef LOCAL_SOONG_JNI_LIBS_$(TARGET_2ND_ARCH)
+      my_2nd_arch_prefix := $(TARGET_2ND_ARCH_VAR_PREFIX)
+      LOCAL_JNI_SHARED_LIBRARIES := $(LOCAL_SOONG_JNI_LIBS_$(TARGET_2ND_ARCH))
+      partition_lib_pairs :=  $(LOCAL_SOONG_JNI_LIBS_PARTITION_$(TARGET_2ND_ARCH))
+      include $(BUILD_SYSTEM)/install_jni_libs_internal.mk
+    endif
+  endif
 endif
 LOCAL_SHARED_JNI_LIBRARIES :=
 my_embed_jni :=
diff --git a/core/soong_config.mk b/core/soong_config.mk
index 091fa34..0101796 100644
--- a/core/soong_config.mk
+++ b/core/soong_config.mk
@@ -286,6 +286,7 @@
 $(call add_json_bool, BuildBrokenDepfile,                 $(filter true,$(BUILD_BROKEN_DEPFILE)))
 $(call add_json_bool, BuildBrokenEnforceSyspropOwner,     $(filter true,$(BUILD_BROKEN_ENFORCE_SYSPROP_OWNER)))
 $(call add_json_bool, BuildBrokenTrebleSyspropNeverallow, $(filter true,$(BUILD_BROKEN_TREBLE_SYSPROP_NEVERALLOW)))
+$(call add_json_bool, BuildBrokenUsesSoongPython2Modules, $(filter true,$(BUILD_BROKEN_USES_SOONG_PYTHON2_MODULES)))
 $(call add_json_bool, BuildBrokenVendorPropertyNamespace, $(filter true,$(BUILD_BROKEN_VENDOR_PROPERTY_NAMESPACE)))
 $(call add_json_list, BuildBrokenInputDirModules, $(BUILD_BROKEN_INPUT_DIR_MODULES))
 
diff --git a/tools/releasetools/Android.bp b/tools/releasetools/Android.bp
index 29fc771..094ffe1 100644
--- a/tools/releasetools/Android.bp
+++ b/tools/releasetools/Android.bp
@@ -598,6 +598,7 @@
         "testdata/**/*",
         ":com.android.apex.compressed.v1",
         ":com.android.apex.compressed.v1_original",
+        ":com.android.apex.vendor.foo.with_vintf"
     ],
     target: {
         darwin: {
diff --git a/tools/releasetools/test_check_target_files_vintf.py b/tools/releasetools/test_check_target_files_vintf.py
index 8725dd6..7c154d7 100644
--- a/tools/releasetools/test_check_target_files_vintf.py
+++ b/tools/releasetools/test_check_target_files_vintf.py
@@ -15,6 +15,7 @@
 #
 
 import os.path
+import shutil
 
 import common
 import test_utils
@@ -86,6 +87,28 @@
 
     return test_dir
 
+  # Prepare test dir with required HAL for APEX testing
+  def prepare_apex_test_dir(self, test_delta_rel_path):
+    test_dir = self.prepare_test_dir(test_delta_rel_path)
+    write_string_to_file(
+        """<compatibility-matrix version="1.0" level="1" type="framework">
+            <hal format="aidl" optional="false" updatable-via-apex="true">
+                <name>android.apex.foo</name>
+                <version>1</version>
+                <interface>
+                    <name>IApex</name>
+                    <instance>default</instance>
+                </interface>
+            </hal>
+            <sepolicy>
+                <sepolicy-version>0.0</sepolicy-version>
+                <kernel-sepolicy-version>0</kernel-sepolicy-version>
+            </sepolicy>
+        </compatibility-matrix>""",
+        os.path.join(test_dir, 'SYSTEM/etc/vintf/compatibility_matrix.1.xml'))
+
+    return test_dir
+
   @test_utils.SkipIfExternalToolsUnavailable()
   def test_CheckVintf_skeleton(self):
     msg = 'vintf check with skeleton target files failed.'
@@ -143,3 +166,25 @@
                          os.path.join(test_dir, 'VENDOR/etc/vintf/manifest.xml'))
     # Should raise an error because a file has invalid format.
     self.assertRaises(common.ExternalError, CheckVintf, test_dir)
+
+  @test_utils.SkipIfExternalToolsUnavailable()
+  def test_CheckVintf_apex_compat(self):
+    apex_file_name = 'com.android.apex.vendor.foo.with_vintf.apex'
+    msg = 'vintf/apex_compat should be compatible because ' \
+          'APEX %s has the required HALs' % (apex_file_name)
+    test_dir = self.prepare_apex_test_dir('vintf/apex_compat')
+    # Copy APEX under VENDOR/apex
+    apex_file = os.path.join(test_utils.get_current_dir(), apex_file_name)
+    apex_dir = os.path.join(test_dir, 'VENDOR/apex')
+    os.makedirs(apex_dir)
+    shutil.copy(apex_file, apex_dir)
+    # Should find required HAL via APEX
+    self.assertTrue(CheckVintf(test_dir), msg=msg)
+
+  @test_utils.SkipIfExternalToolsUnavailable()
+  def test_CheckVintf_apex_incompat(self):
+    msg = 'vintf/apex_incompat should be incompatible because ' \
+          'no APEX data'
+    test_dir = self.prepare_apex_test_dir('vintf/apex_incompat')
+    # Should not find required HAL
+    self.assertFalse(CheckVintf(test_dir), msg=msg)