Add support for prebuilt AARs.

- You can give a .aar as source file to a prebuilt static Java library
  module. The build system will set up dependencies and rules to extract
  classes.jar and other resource files.
- To build against a prebuilt AAR module, use:
  LOCAL_STATIC_JAVA_AAR_LIBRARIES := <module names of aar prebuilt AARs>
  The build system will set up rules to merge the library's
  AndroidManifest.xml with the main AndroidManifest.xml, add the AAR's
  resource dirs and link/merge the AAR's classes.jar.

Bug: 18168693
Change-Id: Ic2c1d20572a93bd98dbc72f8a39e26b459e442c2
(cherry picked from commit e9dd9f2)

core/android_manifest.mk

@@ -11,13 +11,27 @@ else
   full_android_manifest := $(LOCAL_PATH)/$(LOCAL_MANIFEST_FILE)
 endif
 
+my_full_libs_manifest_files := $(LOCAL_FULL_LIBS_MANIFEST_FILES)
+my_full_libs_manifest_deps := $(LOCAL_FULL_LIBS_MANIFEST_FILES)
+
+# Set up dependency on aar libraries
+ifdef LOCAL_STATIC_JAVA_AAR_LIBRARIES
+my_full_libs_manifest_deps += $(foreach lib, $(LOCAL_STATIC_JAVA_AAR_LIBRARIES),\
+  $(call intermediates-dir-for,JAVA_LIBRARIES,$(lib),,COMMON)/aar/classes.jar)
+my_full_libs_manifest_files += $(foreach lib, $(LOCAL_STATIC_JAVA_AAR_LIBRARIES),\
+  $(call intermediates-dir-for,JAVA_LIBRARIES,$(lib),,COMMON)/aar/AndroidManifest.xml)
+
+LOCAL_RESOURCE_DIR += $(foreach lib, $(LOCAL_STATIC_JAVA_AAR_LIBRARIES),\
+  $(call intermediates-dir-for,JAVA_LIBRARIES,$(lib),,COMMON)/aar/res)
+endif
+
 # Set up rules to merge library manifest files
-ifdef LOCAL_FULL_LIBS_MANIFEST_FILES
+ifdef my_full_libs_manifest_files
 main_android_manifest := $(full_android_manifest)
 full_android_manifest := $(intermediates.COMMON)/AndroidManifest.xml
-$(full_android_manifest): PRIVATE_LIBS_MANIFESTS := $(LOCAL_FULL_LIBS_MANIFEST_FILES)
-$(full_android_manifest) : $(main_android_manifest) $(LOCAL_FULL_LIBS_MANIFEST_FILES)
-	@echo "Merge android manifest files: $@ <-- $^"
+$(full_android_manifest): PRIVATE_LIBS_MANIFESTS := $(my_full_libs_manifest_files)
+$(full_android_manifest) : $(main_android_manifest) $(my_full_libs_manifest_deps)
+	@echo "Merge android manifest files: $@ <-- $< $(PRIVATE_LIBS_MANIFESTS)"
 	@mkdir -p $(dir $@)
 	$(hide) $(ANDROID_MANIFEST_MERGER) --main $< --libs $(PRIVATE_LIBS_MANIFESTS) \
 	    --out $@

core/clear_vars.mk

@@ -30,6 +30,7 @@ LOCAL_MODULE_TAGS:=
 LOCAL_SRC_FILES:=
 LOCAL_PREBUILT_OBJ_FILES:=
 LOCAL_STATIC_JAVA_LIBRARIES:=
+LOCAL_STATIC_JAVA_AAR_LIBRARIES:=
 LOCAL_STATIC_LIBRARIES:=
 # Group static libraries with "-Wl,--start-group" and "-Wl,--end-group" when linking.
 LOCAL_GROUP_STATIC_LIBRARIES:=

core/java.mk

@@ -52,6 +52,9 @@ else
 endif
 endif
 
+# LOCAL_STATIC_JAVA_AAR_LIBRARIES are special LOCAL_STATIC_JAVA_LIBRARIES
+LOCAL_STATIC_JAVA_LIBRARIES := $(strip $(LOCAL_STATIC_JAVA_LIBRARIES) $(LOCAL_STATIC_JAVA_AAR_LIBRARIES))
+
 LOCAL_JAVA_LIBRARIES := $(sort $(LOCAL_JAVA_LIBRARIES))
 
 LOCAL_BUILT_MODULE_STEM := $(strip $(LOCAL_BUILT_MODULE_STEM))

core/package_internal.mk

@@ -192,6 +192,8 @@ endif # LOCAL_EMMA_INSTRUMENT
 
 rs_compatibility_jni_libs :=
 
+include $(BUILD_SYSTEM)/android_manifest.mk
+
 #################################
 include $(BUILD_SYSTEM)/java.mk
 #################################
@@ -201,8 +203,6 @@ ifeq ($(LOCAL_SDK_RES_VERSION),)
   LOCAL_SDK_RES_VERSION:=$(LOCAL_SDK_VERSION)
 endif
 
-include $(BUILD_SYSTEM)/android_manifest.mk
-
 $(LOCAL_INTERMEDIATE_TARGETS): \
     PRIVATE_ANDROID_MANIFEST := $(full_android_manifest)
 ifneq (,$(filter-out current system_current, $(LOCAL_SDK_VERSION)))

core/prebuilt_internal.mk

@@ -260,10 +260,26 @@ ifeq ($(LOCAL_IS_HOST_MODULE)$(LOCAL_MODULE_CLASS),JAVA_LIBRARIES)
 # while the deps should be in the common dir, so we make a copy in the common dir.
 # For nonstatic library, $(common_javalib_jar) is the dependency file,
 # while $(common_classes_jar) is used to link.
-common_classes_jar := $(call intermediates-dir-for,JAVA_LIBRARIES,$(LOCAL_MODULE),,COMMON)/classes.jar
-common_javalib_jar := $(dir $(common_classes_jar))javalib.jar
+common_classes_jar := $(intermediates.COMMON)/classes.jar
+common_javalib_jar := $(intermediates.COMMON)/javalib.jar
 
-$(common_classes_jar) : $(my_prebuilt_src_file) | $(ACP)
+$(common_classes_jar) $(common_javalib_jar): PRIVATE_MODULE := $(LOCAL_MODULE)
+
+ifneq ($(filter %.aar, $(my_prebuilt_src_file)),)
+# This is .aar file, archive of classes.jar and Android resources.
+my_src_jar := $(intermediates.COMMON)/aar/classes.jar
+
+$(my_src_jar) : $(my_prebuilt_src_file)
+	$(hide) rm -rf $(dir $@) && mkdir -p $(dir $@)
+	$(hide) unzip -qo -d $(dir $@) $<
+	# Make sure the extracted classes.jar has a new timestamp.
+	$(hide) touch $@
+
+else
+# This is jar file.
+my_src_jar := $(my_prebuilt_src_file)
+endif
+$(common_classes_jar) : $(my_src_jar) | $(ACP)
 	$(transform-prebuilt-to-target)
 
 $(common_javalib_jar) : $(common_classes_jar) | $(ACP)