ABS（Android Build System）中在编译时生成源代码文件

来源：互联网发布：vb调用matlab工具箱编辑：程序博客网时间：2024/06/06 04:29

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

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