More flexibility to keep/remove R.class in static Java library

- Usually you don't need to set LOCAL_JAR_EXCLUDE_FILES in your
  Android.mk, if your static library is directly used by an app.
- If your library will be included by another library that need
  reference the R/Manifest class, you can set
  LOCAL_JAR_EXCLUDE_FILES := none
  to keep the generated classes.
- If your library includes another static library that has Android
  resource and you want to remove the generated classes carried by
  the static library, set:
  LOCAL_JAR_EXCLUDE_FILES := $(ANDROID_RESOURCE_GENERATED_CLASSES)

With the LOCAL_JAR_EXCLUDE_FILES value "none", deprecate the old
long variable LOCAL_KEEP_R_CLASS_IN_STATIC_JAVA_LIBRARY.

Change-Id: I3b9ad5d66f0262f784feb09bc1537c5b01256258
diff --git a/core/definitions.mk b/core/definitions.mk
index f3e4966..9fe0a11 100644
--- a/core/definitions.mk
+++ b/core/definitions.mk
@@ -81,6 +81,10 @@
 # GPL module license files
 ALL_GPL_MODULE_LICENSE_FILES:=
 
+# Generated class file names for Android resource.
+# They are escaped and quoted so can be passed safely to a bash command.
+ANDROID_RESOURCE_GENERATED_CLASSES := 'R.class' 'R$$*.class' 'Manifest.class' 'Manifest$$*.class'
+
 ###########################################################
 ## Debugging; prints a variable list to stdout
 ###########################################################
@@ -1515,6 +1519,10 @@
 $(hide) rm -f $(PRIVATE_CLASS_INTERMEDIATES_DIR)/java-source-list
 $(hide) rm -f $(PRIVATE_CLASS_INTERMEDIATES_DIR)/java-source-list-uniq
 $(hide) rm -f $@
+$(if $(PRIVATE_JAR_EXCLUDE_FILES), $(hide) find $(PRIVATE_CLASS_INTERMEDIATES_DIR) \
+    -name $(word 1, $(PRIVATE_JAR_EXCLUDE_FILES)) \
+    $(addprefix -o -name , $(wordlist 2, 999, $(PRIVATE_JAR_EXCLUDE_FILES))) \
+    | xargs rm -rf)
 $(hide) jar $(if $(strip $(PRIVATE_JAR_MANIFEST)),-cfm,-cf) \
     $@ $(PRIVATE_JAR_MANIFEST) -C $(PRIVATE_CLASS_INTERMEDIATES_DIR) .
 $(hide) mv $(PRIVATE_CLASS_INTERMEDIATES_DIR)/newstamp $(PRIVATE_CLASS_INTERMEDIATES_DIR)/stamp