diff --git a/core/main.mk b/core/main.mk
index 3866037..18f9611 100644
--- a/core/main.mk
+++ b/core/main.mk
@@ -764,6 +764,9 @@
     $(info $(word 1,$(r)) module $(word 2,$(r)) requires non-existent $(word 3,$(r)) module: $(word 4,$(r))) \
   )
   $(warning Set BUILD_BROKEN_MISSING_REQUIRED_MODULES := true to bypass this check if this is intentional)
+  ifneq (,$(PRODUCT_SOURCE_ROOT_DIRS))
+    $(warning PRODUCT_SOURCE_ROOT_DIRS is non-empty. Some necessary modules may have been skipped by Soong)
+  endif
   $(error Build failed)
 endif # _nonexistent_required != empty
 endif # check_missing_required_modules == true
diff --git a/core/product.mk b/core/product.mk
index f4d5a4f..4c254bf 100644
--- a/core/product.mk
+++ b/core/product.mk
@@ -269,6 +269,9 @@
 # List of tags that will be used to gate blueprint modules from the build graph
 _product_list_vars += PRODUCT_INCLUDE_TAGS
 
+# List of directories that will be used to gate blueprint modules from the build graph
+_product_list_vars += PRODUCT_SOURCE_ROOT_DIRS
+
 # When this is true, various build time as well as runtime debugfs restrictions are enabled.
 _product_single_value_vars += PRODUCT_SET_DEBUGFS_RESTRICTIONS
 
diff --git a/core/soong_config.mk b/core/soong_config.mk
index 0101796..0c6ab70 100644
--- a/core/soong_config.mk
+++ b/core/soong_config.mk
@@ -306,6 +306,7 @@
 $(call add_json_bool, IgnorePrefer32OnDevice, $(filter true,$(IGNORE_PREFER32_ON_DEVICE)))
 
 $(call add_json_list, IncludeTags,                $(PRODUCT_INCLUDE_TAGS))
+$(call add_json_list, SourceRootDirs,             $(PRODUCT_SOURCE_ROOT_DIRS))
 
 $(call json_end)
 
diff --git a/core/tasks/tools/package-modules.mk b/core/tasks/tools/package-modules.mk
index c41aec5..b15df28 100644
--- a/core/tasks/tools/package-modules.mk
+++ b/core/tasks/tools/package-modules.mk
@@ -50,12 +50,12 @@
   $(error done)
 endif
 
-my_missing_files = $(shell $(call echo-warning,$(my_makefile),$(my_package_name): Unknown installed file for module '$(1)'))
+my_missing_files = $(shell $(call echo-warning,$(my_makefile),$(my_package_name): Unknown installed file for module '$(1)'))$(shell$(call echo-warning,$(my_makefile),$(my_package_name): Some necessary modules may have been skipped by Soong. Check if PRODUCT_SOURCE_ROOT_DIRS is pruning necessary Android.bp files.))
 ifeq ($(ALLOW_MISSING_DEPENDENCIES),true)
   # Ignore unknown installed files on partial builds
   my_missing_files =
 else ifneq ($(my_modules_strict),false)
-  my_missing_files = $(shell $(call echo-error,$(my_makefile),$(my_package_name): Unknown installed file for module '$(1)'))$(eval my_missing_error := true)
+  my_missing_files = $(shell $(call echo-error,$(my_makefile),$(my_package_name): Unknown installed file for module '$(1)'))$(shell$(call echo-warning,$(my_makefile),$(my_package_name): Some necessary modules may have been skipped by Soong. Check if PRODUCT_SOURCE_ROOT_DIRS is pruning necessary Android.bp files.))$(eval my_missing_error := true)
 endif
 
 # Iterate over modules' built files and installed files;