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编译时经常有的需求是有些.c或者.h文件需要在编译时由某个接口定义文件生成。同时还可能有下面的需求：
* 同一个接口定义文件会用于产生多个源文件。
* 生成的源文件可能会被其它的Project使用。
举例来说，现在需要从接口定义文件xxx.xml通过可执行文件generator生成源文件xxx_A.h，xxx_B.h和xxx_C.c。命令为：
generator A < xxx.xml > xxx_A.h
generator B < xxx.xml > xxx_B.h
generator C < xxx.xml > xxx_C.c
一个方法是用ABS里定义的transform-generated-source函数：
GENERATOR := $(HOST_OUT_EXECUTABLES)/generator$(HOST_EXECUTABLE_SUFFIX)
IDL_DIR := ./
IDL_SRC := $(IDL_DIR)/xxx.xml
IDL_TGT_CODE := $(IDL_DIR)/xxx_C.c
IDL_TGT_A := $(IDL_DIR)/xxx_A.h
IDL_TGT_B := $(IDL_DIR)/xxx_B.h
GEN := $(LOCAL_PATH)/$(IDL_TGT_A)
$(GEN): PRIVATE_PATH := $(LOCAL_PATH)
$(GEN): PRIVATE_CUSTOM_TOOL = $(GENERATOR) A < $< > $@
$(GEN): $(LOCAL_PATH)/$(IDL_SRC)
$(transform-generated-source)
LOCAL_GENERATED_SOURCES += $(GEN)
GEN := $(LOCAL_PATH)/$(IDL_TGT_B)
$(GEN): PRIVATE_PATH := $(LOCAL_PATH)
$(GEN): PRIVATE_CUSTOM_TOOL = $(GENERATOR) B < $< > $@
$(GEN): $(LOCAL_PATH)/$(IDL_SRC)
$(transform-generated-source)
LOCAL_GENERATED_SOURCES += $(GEN)
GEN := $(LOCAL_PATH)/$(IDL_TGT_CODE)
$(GEN): PRIVATE_PATH := $(LOCAL_PATH)
$(GEN): PRIVATE_CUSTOM_TOOL = $(GENERATOR) C < $< > $@
$(GEN): $(LOCAL_PATH)/$(IDL_SRC) $(LOCAL_PATH)/$(IDL_TGT_A) $(LOCAL_PATH)/$(IDL_TGT_B)
$(transform-generated-source)
LOCAL_GENERATED_SOURCES += $(GEN)
...
LOCAL_SRC_FILES := \
$(IDL_TGT_CODE) \
...
如果接口定义文件有多个，比如可能有a.xml, b.xml等等，那可能下面方法更方便一些。
GENERATOR := $(HOST_OUT_EXECUTABLES)/generator$(HOST_EXECUTABLE_SUFFIX)
IDL_DIR := ./
IDL_TGT_CODE := $(IDL_DIR)/xxx_C.c
define transform-generated-A
@echo "target Generated $@ <= $<"
$(GENERATOR) A < $< > $@
endef
define transform-generated-B
@echo "target Generated $@ <= $<"
$(GENERATOR) B < $< > $@
endef
define transform-generated-C
@echo "target Generated $@ <= $<"
$(GENERATOR) C < $< > $@
endef
$(LOCAL_PATH)/$(IDL_DIR)/%_A.h : $(LOCAL_PATH)/$(IDL_DIR)/%.xml
$(transform-generated-A)
$(LOCAL_PATH)/$(IDL_DIR)/%_B.h : $(LOCAL_PATH)/$(IDL_DIR)/%.xml
$(transform-generated-B)
$(LOCAL_PATH)/$(IDL_DIR)/%-C.c : $(LOCAL_PATH)/$(IDL_DIR)/%.xml
$(transform-generated-C)
...
LOCAL_SRC_FILES := \
$(IDL_TGT_CODE) \
...
LOCAL_ADDITIONAL_DEPENDENCIES += $(LOCAL_PATH)/xxx_A.h $(LOCAL_PATH)/xxx_B.h
另外如果想编译出来的image中某几个特定binary带symbol，可以在Android.mk中加：
LOCAL_STRIP_MODULE := false
ABS（Android Build System）中在编译时生成源代码文件
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原文地址：http://blog.csdn.net/jinzhuojun/article/details/45787905
