标签：android.mk copy product_copy_files all_prebuilt build_prebuilt
对andriod系统层进行开发，或者进行移植时，时常需要添加文件到编译体系中，在最终的编译中复制到out中，最后打包成镜像，这里总结一下Copy File 方法，这里以我的 android 4.2.1为例.
如有不对或者有其它的新招，欢迎拍砖留言～
撰写不易,转载请注明出处：http://blog.csdn.net/jscese/article/details/40615801
这个变量就是用来标记Copy操作的，比较常见的形式如下：
#jscese cp 3g script and
PRODUCT_COPY_FILES += $(DEVICE_SOURCES)/3g-script/ip-up-datakey:system/etc/ppp/ip-up-datakey $(DEVICE_SOURCES)/3g-script/ip-down-datakey:system/etc/ppp/ip-down-datakey $(DEVICE_SOURCES)/3g-script/init.gprs-pppd:system/etc/ppp/init.gprs-pppd device/sample/etc/apns-full-conf.xml:system/etc/apns-conf.xml #external/usb-modeswitch/usb_modeswitch.d:system/etc/usb_modeswitch.d
#PRODUCT_COPY_FILES += \
#$(DEVICE_SOURCES)/3g-script/ip-down-datakey:system/etc/ppp/ip-down-datakey
#end
可以看到 格式<source file>:<dest file> 中间用 “ ： ” 隔开！
编译过源码的都知道在最开始 编译的时候 都会出现：
PRODUCT_COPY_FILES frameworks/base/data/sounds/effects/ogg/Effect_Tick.ogg:system/media/audio/ui/Effect_Tick.ogg ignored. PRODUCT_COPY_FILES frameworks/base/data/sounds/effects/ogg/KeypressStandard.ogg:system/media/audio/ui/KeypressStandard.ogg ignored. PRODUCT_COPY_FILES frameworks/base/data/sounds/effects/ogg/KeypressSpacebar.ogg:system/media/audio/ui/KeypressSpacebar.ogg ignored. PRODUCT_COPY_FILES frameworks/base/data/sounds/effects/ogg/KeypressDelete.ogg:system/media/audio/ui/KeypressDelete.ogg ignored. PRODUCT_COPY_FILES frameworks/base/data/sounds/effects/ogg/KeypressReturn.ogg:system/media/audio/ui/KeypressReturn.ogg ignored. ...这样的打印，现在告诉你这东西在哪里打出来的～ /build/core/Makefile 中最开始的：
# ----------------------------------------------------------------- # Define rules to copy PRODUCT_COPY_FILES defined by the product. # PRODUCT_COPY_FILES contains words like <source file>:<dest file>[:<owner>]. # <dest file> is relative to $(PRODUCT_OUT), so it should look like, # e.g., "system/etc/file.xml". # The filter part means "only eval the copy-one-file rule if this # src:dest pair is the first one to match the same dest" #$(1): the src:dest pair define check-product-copy-files $(if $(filter %.apk, $(1)),$(error Prebuilt apk found in PRODUCT_COPY_FILES: $(1), use BUILD_PREBUILT instead!)) endef # filter out the duplicate <source file>:<dest file> pairs. unique_product_copy_files_pairs := $(foreach cf,$(PRODUCT_COPY_FILES), $(if $(filter $(unique_product_copy_files_pairs),$(cf)),, $(eval unique_product_copy_files_pairs += $(cf)))) unique_product_copy_files_destinations := $(foreach cf,$(unique_product_copy_files_pairs), $(eval _src := $(call word-colon,1,$(cf))) $(eval _dest := $(call word-colon,2,$(cf))) $(call check-product-copy-files,$(cf)) $(if $(filter $(unique_product_copy_files_destinations),$(_dest)), $(info PRODUCT_COPY_FILES $(cf) ignored.), $(eval _fulldest := $(call append-path,$(PRODUCT_OUT),$(_dest))) $(if $(filter %.xml,$(_dest)), $(eval $(call copy-xml-file-checked,$(_src),$(_fulldest))), $(eval $(call copy-one-file,$(_src),$(_fulldest)))) $(eval ALL_DEFAULT_INSTALLED_MODULES += $(_fulldest)) $(eval unique_product_copy_files_destinations += $(_dest)))) unique_product_copy_files_pairs := unique_product_copy_files_destinations :=
这就是 PRODUCT_COPY_FILES 起作用的地方！ 可以看上面注释，描述了规则用法，只能copy file！
也就是上面编译打印的出处，代表忽略项. 详细的规则可跟进去细看，无非是依赖Copy之类的.
这里需要注意一点， PRODUCT_COPY_FILES 不能在 Android.mk 中使用 添加新的Copy 项！
详情可看/build/core/main.mk 中的：
# Can't use first-makefiles-under here because # --mindepth=2 makes the prunes not work. subdir_makefiles := $(shell build/tools/findleaves.py --prune=out --prune=.repo --prune=.git $(subdirs) Android.mk) include $(subdir_makefiles) endif # ONE_SHOT_MAKEFILE # Now with all Android.mks loaded we can do post cleaning steps. include $(BUILD_SYSTEM)/post_clean.mk ifeq ($(stash_product_vars),true) $(call assert-product-vars, __STASHED) endif
在这里加载所有的Android.mk ，重点在后面的 assert-product-vars 函数：
# # Assert that the the variable stashed by stash-product-vars remains untouched. # $(1): The prefix as supplied to stash-product-vars # define assert-product-vars $(strip $(eval changed_variables:=) $(foreach v,$(_product_stash_var_list), $(if $(call streq,$($(v)),$($(strip $(1))_$(call rot13,$(v)))),, $(eval $(warning $(v) has been modified: $($(v)))) $(eval $(warning previous value: $($(strip $(1))_$(call rot13,$(v))))) $(eval changed_variables := $(changed_variables) $(v))) ) $(if $(changed_variables), $(eval $(error The following variables have been changed: $(changed_variables))),) ) endef
build/core/main.mk:528: *** The following variables have been changed: PRODUCT_COPY_FILES。 停止。
使用 PRODUCT_COPY_FILES 应该算是最常用的Copy File 的方法了，一般可直接加在 device.mk 中！
这个方法用在Android.mk中，可参考 /system/core/rootdir/Android.mk：
copy_from += etc/init.goldfish.sh
copy_to := $(addprefix $(TARGET_OUT)/,$(copy_from))
copy_from := $(addprefix $(LOCAL_PATH)/,$(copy_from))
$(copy_to) : PRIVATE_MODULE := system_etcdir
$(copy_to) : $(TARGET_OUT)/% : $(LOCAL_PATH)/% | $(ACP)
$(transform-prebuilt-to-target)
ALL_PREBUILT += $(copy_to)可以看下规则，定义在/build/core/definitions.mk中：
# Copy a prebuilt file to a target location. define transform-prebuilt-to-target @echo "$(if $(PRIVATE_IS_HOST_MODULE),host,target) Prebuilt: $(PRIVATE_MODULE) ($@)" $(copy-file-to-target) endef
define copy-file-to-target @mkdir -p $(dir $@) $(hide) $(ACP) -fp $< $@ endef
build/core/main.mk:533: *** Some files have been added to ALL_PREBUILT. build/core/main.mk:534: * build/core/main.mk:535: * ALL_PREBUILT is a deprecated mechanism that build/core/main.mk:536: * should not be used for new files. build/core/main.mk:537: * As an alternative, use PRODUCT_COPY_FILES in build/core/main.mk:538: * the appropriate product definition. build/core/main.mk:539: * build/target/product/core.mk is the product build/core/main.mk:540: * definition used in all products. build/core/main.mk:541: * build/core/main.mk:542: * unexpected usb_modeswitch.h in ALL_PREBUILT build/core/main.mk:542: * unexpected usb_modeswitch.sh in ALL_PREBUILT build/core/main.mk:542: * unexpected usb_modeswitch.tcl in ALL_PREBUILT build/core/main.mk:543: * build/core/main.mk:544: *** ALL_PREBUILT contains unexpected files。 停止。
include $(BUILD_SYSTEM)/legacy_prebuilts.mk ifneq ($(filter-out $(GRANDFATHERED_ALL_PREBUILT),$(strip $(notdir $(ALL_PREBUILT)))),) $(warning *** Some files have been added to ALL_PREBUILT.) $(warning *) $(warning * ALL_PREBUILT is a deprecated mechanism that) $(warning * should not be used for new files.) $(warning * As an alternative, use PRODUCT_COPY_FILES in) $(warning * the appropriate product definition.) $(warning * build/target/product/core.mk is the product) $(warning * definition used in all products.) $(warning *) $(foreach bad_prebuilt,$(filter-out $(GRANDFATHERED_ALL_PREBUILT),$(strip $(notdir $(ALL_PREBUILT)))),$(warning * unexpected $(bad_prebuilt) in ALL_PREBUILT)) $(warning *) $(error ALL_PREBUILT contains unexpected files) endif
上面的打印信息告诉我们 ALL_PREBUILT 是一种过时的机制，已经不让用于copy新的文件了，推荐使用PRODUCT_COPY_FILES !
而可以添加进 ALL_PREBUILT 变量的成员定义在 legacy_prebuilts.mk中：
# This is the list of modules grandfathered to use ALL_PREBUILT # DO NOT ADD ANY NEW MODULE TO THIS FILE # # ALL_PREBUILT modules are hard to control and audit and we don't want # to add any new such module in the system GRANDFATHERED_ALL_PREBUILT := akmd2 am ap_gain.bin ...
注释写的很明白了！
所以如果我们自己想加个文件编译copy ，就不能使用 copy_from copy_to ALL_prebuilt 这种机制 !
这种方式把文件当成编译项目，在Android.mk中copy一个file：
LOCAL_PATH := $(call my-dir) include $(CLEAR_VARS) LOCAL_MODULE := usb_modeswitch.conf LOCAL_MODULE_CLASS := ETC LOCAL_MODULE_PATH := $(TARGET_OUT)/etc LOCAL_SRC_FILES :=$(LOCAL_MODULE) include $(BUILD_PREBUILT)
上面所有的都说的是Copy File 但是如果需要 Copy 一个文件目录下所有就需要另做操作了！
以我前面的博客 Android——4.2 - 3G移植之路之usb-modeswitch (二) 中copy usb-modewitch.d 数据目录 为例.
在那里的Android.mk 中我使用了shell命令Copy：
$(shell cp -rf $(LOCAL_PATH)/usb_modeswitch.d $(TARGET_OUT)/etc/usb_modeswitch.d)
所以说在android的编译体系中 还得按照android提供的机制来进行操作，像这种shell取巧，是方便，但不是正途！
我现在的处理：
在上面的shell的地方 include 处理Copy usb-modewitch.d 的mk文件，内容如下：
# $(1): module name # $(2): source file # $(3): destination directory define include-prebuilt-with-destination-directory include $$(CLEAR_VARS) LOCAL_MODULE := $(1) LOCAL_ADDITIONAL_DEPENDENCIES := $(LOCAL_PATH)/usb_modeswitch_data.mk LOCAL_MODULE_STEM := $(notdir $(2)) LOCAL_MODULE_TAGS := optional LOCAL_MODULE_CLASS := ETC LOCAL_MODULE_PATH := $(3) LOCAL_SRC_FILES := $(2) include $$(BUILD_PREBUILT) endef #== rename 's/:/_/' * ==# usb_modeswitch_data := $(notdir $(wildcard $(LOCAL_PATH)/usb_modeswitch.d/*)) $(warning jscese display -usb_modeswitch_data--$(usb_modeswitch_data)) usb_modeswitch_data_target_directory := $(TARGET_OUT)/etc/usb_modeswitch.d $(foreach data, $(usb_modeswitch_data), $(eval $(call include-prebuilt-with-destination-directory,target-data-$(notdir $(data)),usb_modeswitch.d/$(data),$(usb_modeswitch_data_target_directory)))) usb_modeswitch_data_target := $(addprefix $(usb_modeswitch_data_target_directory)/,$(foreach cacert,$(usb_modeswitch_data),$(notdir $(usb_modeswitch_data)))) .PHONY: usb_modeswitch_data_target usb_modeswitch_data: $(usb_modeswitch_data_target) # This is so that build/target/product/core.mk can use usb_modeswitch_data in PRODUCT_PACKAGES ALL_MODULES.usb_modeswitch_data.INSTALLED := $(usb_modeswitch_data_target)
关于PRODUCT_PACKAGES 变量的作用可参考我之前的博文 Android——编译安装Module的控制因素
另外因为文件名称都是 XXXX：XXXX类型，我这里先在直接使用reanme命令把：全替换成 _
如果不替换，导致传入文件的时候 makefile 把中间的 ： 可能当成了依赖符号～ 会报错
我如果使用subst 把：换成 \: 添加进去转义符号，好像是文件又找不到，不知道有没有遇到过这种情况.....
标签：android.mk copy product_copy_files all_prebuilt build_prebuilt
原文地址：http://blog.csdn.net/jscese/article/details/40615801
