Add option to allow product makefiles to skip building super_empty.img

This change doesn't change the condition for building super_empty.img,
it just add a toggle PRODUCT_BUILD_SUPER_EMPTY_IMAGE that product
makefiles can use to skip building super_empty.img.
Products that don't use super_empty at all, for example GSI, can set
this option to ensure the super_empty.img is not built.

Bug: 183068624
Test: "m dist" on GSI and check the build artifacts under OUT and DIST
  directories, and check the contents of *-img-*.zip
Change-Id: I54943952873d2d297fd9d18cbe14742bc12ae9c6

core/Makefile

@@ -4621,6 +4621,8 @@ define dump-dynamic-partitions-info
   echo "lpmake=$(notdir $(LPMAKE))" >> $(1)
   $(if $(filter true,$(PRODUCT_BUILD_SUPER_PARTITION)), $(if $(BOARD_SUPER_PARTITION_SIZE), \
     echo "build_super_partition=true" >> $(1)))
+  $(if $(BUILDING_SUPER_EMPTY_IMAGE), \
+    echo "build_super_empty_partition=true" >> $(1))
   $(if $(filter true,$(BOARD_BUILD_RETROFIT_DYNAMIC_PARTITIONS_OTA_PACKAGE)), \
     echo "build_retrofit_dynamic_partitions_ota_package=true" >> $(1))
   echo "super_metadata_device=$(BOARD_SUPER_PARTITION_METADATA_DEVICE)" >> $(1)
@@ -5490,9 +5492,7 @@ endif # PRODUCT_BUILD_SUPER_PARTITION == "true"
 
 # -----------------------------------------------------------------
 # super empty image
-
+ifdef BUILDING_SUPER_EMPTY_IMAGE
-ifeq (true,$(PRODUCT_USE_DYNAMIC_PARTITIONS))
-ifneq ($(BOARD_SUPER_PARTITION_SIZE),)
 
 INSTALLED_SUPERIMAGE_EMPTY_TARGET := $(PRODUCT_OUT)/super_empty.img
 $(INSTALLED_SUPERIMAGE_EMPTY_TARGET): intermediates := $(call intermediates-dir-for,PACKAGING,super_empty)
@@ -5506,8 +5506,7 @@ $(INSTALLED_SUPERIMAGE_EMPTY_TARGET): $(LPMAKE) $(BUILD_SUPER_IMAGE)
 
 $(call dist-for-goals,dist_files,$(INSTALLED_SUPERIMAGE_EMPTY_TARGET))
 
-endif # BOARD_SUPER_PARTITION_SIZE != ""
+endif # BUILDING_SUPER_EMPTY_IMAGE
-endif # PRODUCT_USE_DYNAMIC_PARTITIONS == "true"
 
 
 # -----------------------------------------------------------------

core/board_config.mk

@@ -460,6 +460,25 @@ ifeq ($(PRODUCT_BUILD_VBMETA_IMAGE),false)
 endif
 .KATI_READONLY := BUILDING_VBMETA_IMAGE
 
+# Are we building a super_empty image
+BUILDING_SUPER_EMPTY_IMAGE :=
+ifeq ($(PRODUCT_BUILD_SUPER_EMPTY_IMAGE),)
+  ifeq (true,$(PRODUCT_USE_DYNAMIC_PARTITIONS))
+    ifneq ($(BOARD_SUPER_PARTITION_SIZE),)
+      BUILDING_SUPER_EMPTY_IMAGE := true
+    endif
+  endif
+else ifeq ($(PRODUCT_BUILD_SUPER_EMPTY_IMAGE),true)
+  ifneq (true,$(PRODUCT_USE_DYNAMIC_PARTITIONS))
+    $(error PRODUCT_BUILD_SUPER_EMPTY_IMAGE set to true, but PRODUCT_USE_DYNAMIC_PARTITIONS is not true)
+  endif
+  ifeq ($(BOARD_SUPER_PARTITION_SIZE),)
+    $(error PRODUCT_BUILD_SUPER_EMPTY_IMAGE set to true, but BOARD_SUPER_PARTITION_SIZE is not defined)
+  endif
+  BUILDING_SUPER_EMPTY_IMAGE := true
+endif
+.KATI_READONLY := BUILDING_SUPER_EMPTY_IMAGE
+
 ###########################################
 # Now we can substitute with the real value of TARGET_COPY_OUT_VENDOR
 ifeq ($(TARGET_COPY_OUT_VENDOR),$(_vendor_path_placeholder))

core/product.mk

@@ -381,6 +381,7 @@ _product_single_value_vars += PRODUCT_BUILD_RECOVERY_IMAGE
 _product_single_value_vars += PRODUCT_BUILD_BOOT_IMAGE
 _product_single_value_vars += PRODUCT_BUILD_VENDOR_BOOT_IMAGE
 _product_single_value_vars += PRODUCT_BUILD_VBMETA_IMAGE
+_product_single_value_vars += PRODUCT_BUILD_SUPER_EMPTY_IMAGE
 
 # List of boot jars delivered via apex
 _product_list_vars += PRODUCT_UPDATABLE_BOOT_JARS

tools/releasetools/add_img_to_target_files.py

@@ -1027,6 +1027,7 @@ def AddImagesToTargetFiles(filename):
       AddVBMeta(output_zip, partitions, "vbmeta", vbmeta_partitions)
 
   if OPTIONS.info_dict.get("use_dynamic_partitions") == "true":
+    if OPTIONS.info_dict.get("build_super_empty_partition") == "true":
       banner("super_empty")
       AddSuperEmpty(output_zip)