darkdukey

#traverse all the directory and subdirectory
define walk
  $(wildcard $(1)) $(foreach e, $(wildcard $(1)/*), $(call walk, $(e)))
endef

#find all the file recursively under jni/
ALLFILES = $(call walk, $(LOCAL_PATH))
FILE_LIST := $(filter %.cpp, $(ALLFILES))

LOCAL_SRC_FILES := $(FILE_LIST:$(LOCAL_PATH)/%=%)