android linux 基础知识总结2
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二 ubuntu下烧录内核和文件系统1. 硬件： 手机一台usb转串口线一根usb转网卡线一根2. 软件环境1> tftp 服务器执行脚本： setup_tftpd.sh 安装和配置tftp服务器，我们默认以 /tftpboot 为 tftp服务器的根目录，需要下载的文件都放在该目录下。2> 获取待烧录的镜像文件svn list svn://192.168.2.148/smartphone/td0901/release/images 查看服务器上的版本情况，通常我们下载最新的,例如，下载9月18号发布的版本：svn co svn://192.168.2.148/smartphone/td0901/release/images/images200909183> 烧录镜像文件用以下文件为例，示范通过tftp烧写内核和文件系统内核 zImage0917 系统分区： system0918.img 数据分区 data0918.img 待烧写的以上文件必须存在于tftp服务器根目录/tftpboot下。具体步骤：首先连接好硬件设备进入blob下载模式1> blob 起来后按任意键Processing obm parameters...Can't detect micco. Set PMIC as normal I2C mode.NAND flash(Manu=0x98 Device=0xba) detected!Slot 0 Foundget relocation tableFound Main Bad block table at address 0x0f000000, version 0x01Found Mirror Bad block table at address 0x0efc0000, version 0x01Consider yourself BLOBed!blob version 2.0.5-pre3 for Marvell LittletonCopyright (C) 1999 2000 2001 2002 2003 Jan-Derk Bakker and Erik Mouwblob comes with ABSOLUTELY NO WARRANTY; read the GNU GPL for details.This is free software, and you are welcome to redistribute itunder certain conditions; read the GNU GPL for details.length not align with page size, change to 0x0Read flash from 0x60000, length 0x0DoneAutoboot (2 seconds) in progress, press any key to stop ..Autoboot abortedType "help" to get a list of commandsblob> 2> 通过 tftp 下载内核到pc内存 0x80800000 地址处 blob> tftp zImage0917Begin init ether usbnet!!!***** Plug-in USB cable & config usbdnet now ****** exit check_usb_connection:1TFTPing zImage0917*^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ OK.received 6144 blocks (3145156 bytes)tftp_cmd: file 'zImage0917' loaded via tftp to address 0x80800000.3> 擦除原来的内核分区，0x100000 为分区起始地址，0x300000为分区长度blob> nanderase -z 0x100000 0x400000the current NAND chip does not support Block Unlocking.Erase 0x300000 length data from flash: 0x100000Erase flash from 0x100000, length 0x300000........................Done4> 烧写内存 0x80800000 开始 实际长度为 3145156 的内核数据到起始地址为 0x100000 的内核分区blob> nandwrite -z 0x80800000 0x100000 3145156the current NAND chip does not support Block Unlocking.Write 0x2ffdc4 length data from RAM: 0x80800000 to flash: 0x100000Write flash from 0x100000, length 0x2ffdc4Erase flash from 0x100000, length 0x300000........................Done........................Done5> 下载系统分区镜像文件到pc内存 0x80800000 地址处 blob> tftp system0918.imgTFTPing system0918.img*^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ OK.received 113138 blocks (57925824 bytes)tftp_cmd: file 'system0918.img' loaded via tftp to address 0x80800000.6> 擦除原来的flash系统分区blob> nanderase -z 0x500000 0x4000000the current NAND chip does not support Block Unlocking.Erase 0x3e0f800 length data from flash: 0x400000Erase flash from 0x400000, length 0x3e0f800...................................................................................................................................................................................................................................................................................Done7> 烧写数据到flash系统分区blob> nandwrite -y 0x80800000 0x500000 57925824the current NAND chip does not support Block Unlocking.Write 0x373e0c0 length data from RAM: 0x80800000 to flash: 0x400000Write flash from 0x400000, length 0x3591800Erase flash from 0x400000, length 0x3591800.........................................................................................................................................................................................................................................................Done........................................................................................................................................................................................................................................Done8> 下载数据分区镜像文件到pc内存 0x80800000 地址处 blob> tftp data0918.imgTFTPing data0918.img*^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ OK.received 33992 blocks (17402880 bytes)tftp_cmd: file 'data0918.img' loaded via tftp to address 0x80800000.blob> 9> 擦除原来的flash数据分区blob> nanderase -z 0x4500000 0xBB00000the current NAND chip does not support Block Unlocking.Erase 0xa81f000 length data from flash: 0x4400000Erase flash from 0x4400000, length 0xa81f000.......................................................................................................................................................................................................................................................................................................................................................................................................Done10> 烧写数据镜像到flash数据分区blob> nandwrite -y 0x80800000 0x4500000 17402880the current NAND chip does not support Block Unlocking.Write 0x1098c00 length data from RAM: 0x80800000 to flash: 0x4400000Write flash from 0x4400000, length 0x1018000Erase flash from 0x4400000, length 0x1018000..................................................................................Done..................................................................................Doneblob> flash分区图：******************************************** * * * ** blob * kernel * system * data ** * * * ********************************************nanderase -z 0x100000 0x400000tftp zImagenandwrite -z 0x80800000 0x100000 <zImage-actual-length>烧写system.img：nanderase -z 0x500000 0x4000000tftp system.imgnandwrite -y 0x80800000 0x500000 <system.img actual length>烧写 userdata.img ：nanderase -z 0x4500000 0xBB00000tftp userdata.imgnandwrite -y 0x80800000 0x4500000 <userdata.img actual length>＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝涉及的内容：svn服务器的使用android的编译系统，原理，工具链，辅助工具，参数等，环境变量，怎样单独添加编译一个单独的模块等。android 的编译结果：文件系统分析文件系统的使用，启动流程设置模块流程分析＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝1. Android编译系统分析编译脚本及系统变量build/envsetup.sh脚本分析在编译源代码之前通常需要在android源代码顶层目录执行 . ./build/envsetup.sh 目的是为了使用脚本 envsetup.sh 里面定义了一些函数：function help()function get_abs_build_var()function get_build_var()function check_product()function check_variant()function setpaths()function printconfig()function set_stuff_for_environment()function set_sequence_number()function settitle()function choosetype()function chooseproduct()function choosevariant()function tapas()function choosecombo()function print_lunch_menu()function lunch()function gettopfunction m()function findmakefile()function mm()function mmm()function croot()function pid()function gdbclient()function jgrep()function cgrep()function resgrep()function getprebuiltfunction tracedmdump()function runhat()function getbugreports()function startviewserver()function stopviewserver()function isviewserverstarted()function smoketest()function runtest()function runtest_py()function godir ()choosecombo 命令分析：function choosecombo(){ choosesim $1 echo echo choosetype $2 echo echo chooseproduct $3 echo echo choosevariant $4 echo set_stuff_for_environment printconfig}会依次进行如下选择：Build for the simulator or the device? 1. Device 2. SimulatorWhich would you like? [1] Build type choices are: 1. release 2. debugWhich would you like? [1] Product choices are: 1. emulator 2. generic 3. sim 4. littletonYou can also type the name of a product if you know it.Which would you like? [littleton] Variant choices are: 1. user 2. userdebug 3. engWhich would you like? [eng] user默认选择以后会出现：TARGET_PRODUCT=littletonTARGET_BUILD_VARIANT=userTARGET_SIMULATOR=falseTARGET_BUILD_TYPE=releaseTARGET_ARCH=armHOST_ARCH=x86HOST_OS=linuxHOST_BUILD_TYPE=releaseBUILD_ID=＝＝＝＝＝＝＝＝＝＝function chooseproduct()函数分析：choices=(`/bin/ls build/target/board/*/BoardConfig.mk vendor/*/*/BoardConfig.mk 2> /dev/null`)读取 build/target/board/* 目录下的板配置文件：BoardConfig.mk读取 vendor/*/*/目录下的板配置文件：BoardConfig.mkchoices 的值为：build/target/board/emulator/BoardConfig.mkbuild/target/board/generic/BoardConfig.mkbuild/target/board/sim/BoardConfig.mkvendor/marvell/littleton/BoardConfig.mk经过： for choice in ${choices[@]} do # The product name is the name of the directory containing # the makefile we found, above. prodlist=(${prodlist[@]} `dirname ${choice} | xargs basename`) done的处理，prodlist的值为：emulator generic sim littleton所以选择菜单为：Product choices are: 1. emulator 2. generic 3. sim 4. littleton如果选择 4，那么 TARGET_PRODUCT 被赋值为： littleton。board_config_mk := \$(strip $(wildcard \$(SRC_TARGET_DIR)/board/$(TARGET_DEVICE)/BoardConfig.mk \vendor/*/$(TARGET_DEVICE)/BoardConfig.mk \))怎样添加一个模块LOCAL_PATH:= $(call my-dir)#编译静态库include $(CLEAR_VARS)LOCAL_MODULE = libhellosLOCAL_CFLAGS = $(L_CFLAGS)LOCAL_SRC_FILES = hellos.cLOCAL_C_INCLUDES = $(INCLUDES)LOCAL_SHARED_LIBRARIES := libcutilsLOCAL_COPY_HEADERS_TO := libhellosLOCAL_COPY_HEADERS := hellos.hinclude $(BUILD_STATIC_LIBRARY)#编译动态库include $(CLEAR_VARS)LOCAL_MODULE = libhellodLOCAL_CFLAGS = $(L_CFLAGS)LOCAL_SRC_FILES = hellod.cLOCAL_C_INCLUDES = $(INCLUDES)LOCAL_SHARED_LIBRARIES := libcutilsLOCAL_COPY_HEADERS_TO := libhellodLOCAL_COPY_HEADERS := hellod.hinclude $(BUILD_SHARED_LIBRARY)BUILD_TEST=trueifeq ($(BUILD_TEST),true)#使用静态库include $(CLEAR_VARS)LOCAL_MODULE := hellosLOCAL_STATIC_LIBRARIES := libhellosLOCAL_SHARED_LIBRARIES :=LOCAL_LDLIBS += -ldlLOCAL_CFLAGS := $(L_CFLAGS)LOCAL_SRC_FILES := mains.cLOCAL_C_INCLUDES := $(INCLUDES)include $(BUILD_EXECUTABLE)#使用动态库include $(CLEAR_VARS)LOCAL_MODULE := hellodLOCAL_MODULE_TAGS := debugLOCAL_SHARED_LIBRARIES := libc libcutils libhellodLOCAL_LDLIBS += -ldlLOCAL_CFLAGS := $(L_CFLAGS)LOCAL_SRC_FILES := maind.cLOCAL_C_INCLUDES := $(INCLUDES)include $(BUILD_EXECUTABLE)endif # ifeq ($(WPA_BUILD_SUPPLICANT),true)#########################local_target_dir := $(TARGET_OUT)/etc/wifi#include $(CLEAR_VARS)#LOCAL_MODULE := wpa_supplicant.conf#LOCAL_MODULE_TAGS := user#LOCAL_MODULE_CLASS := ETC#LOCAL_MODULE_PATH := $(local_target_dir)#LOCAL_SRC_FILES := $(LOCAL_MODULE)#include $(BUILD_PREBUILT)########################系统变量解析LOCAL_MODULE － 编译的目标对象LOCAL_SRC_FILES － 编译的源文件LOCAL_C_INCLUDES － 需要包含的头文件目录LOCAL_SHARED_LIBRARIES － 链接时需要的外部库LOCAL_PRELINK_MODULE － 是否需要prelink处理BUILD_SHARED_LIBRARY － 指明要编译成动态库LOCAL_PATH - 编译时的目录$(call 目录，目录….) 目录引入操作符如该目录下有个文件夹名称 src，则可以这样写 $(call src)，那么就会得到 src 目录的完整路径include $(CLEAR_VARS) -清除之前的一些系统变量CLEAR_VARS:= $(BUILD_SYSTEM)/clear_vars.mk在 build/core/config.mk 定义 CLEAR_VARS:= $(BUILD_SYSTEM)/clear_vars.mk通过include 包含自定义的.mk文件（即是自定义编译规则）或是引用系统其他的.mk文件（系统定义的编译规则）。LOCAL_SRC_FILES － 编译的源文件可以是.c, .cpp, .java, .S（汇编文件）或是.aidl等格式不同的文件用空格隔开。如果编译目录子目录，采用相对路径，如子目录/文件名。也可以通过$(call 目录)，指明编译某目录下所有.c/.cpp/.java/.S/ .aidl文件.追加文件 LOCAL_SRC_FILES += 文件LOCAL_C_INCLUDES － 需要包含的头文件目录可以是系统定义路径，也可以是相对路径. 如该编译目录下有个include目录，写法是include/*.hLOCAL_SHARED_LIBRARIES － 链接时需要的外部共享库LOCAL_STATIC_LIBRARIES － 链接时需要的外部外部静态LOCAL_JAVA_LIBRARIES 加入jar包LOCAL_MODULE － 编译的目标对象module 是指系统的 native code，通常针对c,c++代码./system/core/sh/Android.mk:32:LOCAL_MODULE:= sh./system/core/libcutils/Android.mk:71:LOCAL_MODULE := libcutils./system/core/cpio/Android.mk:9:LOCAL_MODULE := mkbootfs./system/core/mkbootimg/Android.mk:8:LOCAL_MODULE := mkbootimg./system/core/toolbox/Android.mk:61:LOCAL_MODULE:= toolbox./system/core/logcat/Android.mk:10:LOCAL_MODULE:= logcat./system/core/adb/Android.mk:65:LOCAL_MODULE := adb./system/core/adb/Android.mk:125:LOCAL_MODULE := adbd./system/core/init/Android.mk:20:LOCAL_MODULE:= init./system/core/vold/Android.mk:24:LOCAL_MODULE:= vold./system/core/mountd/Android.mk:13:LOCAL_MODULE:= mountdLOCAL_PACKAGE_NAME Java 应用程序的名字用该变量定义./packages/apps/Music/Android.mk:9:LOCAL_PACKAGE_NAME := Music./packages/apps/Browser/Android.mk:14:LOCAL_PACKAGE_NAME := Browser./packages/apps/Settings/Android.mk:8:LOCAL_PACKAGE_NAME := Settings./packages/apps/Stk/Android.mk:10:LOCAL_PACKAGE_NAME := Stk./packages/apps/Contacts/Android.mk:10:LOCAL_PACKAGE_NAME := Contacts./packages/apps/Mms/Android.mk:8:LOCAL_PACKAGE_NAME := Mms./packages/apps/Camera/Android.mk:8:LOCAL_PACKAGE_NAME := Camera./packages/apps/Phone/Android.mk:11:LOCAL_PACKAGE_NAME := Phone./packages/apps/VoiceDialer/Android.mk:8:LOCAL_PACKAGE_NAME := VoiceDialerBUILD_SHARED_LIBRARY － 指明要编译成动态库。编译的目标，用include 操作符UILD_STATIC_LIBRARY来指明要编译成静态库。如果是java文件的话，会用到系统的编译脚本host_java_library.mk，用BUILD_PACKAGE来指明。三个编译－－－－－－－－－－－－－－－－－－－include $(BUILD_STATIC_LIBRARY)BUILD_STATIC_LIBRARY:= $(BUILD_SYSTEM)/static_library.mk－－－－－－－－－－－－－－－－－－－include $(BUILD_SHARED_LIBRARY)./build/core/config.mk:50:BUILD_SHARED_LIBRARY:= $(BUILD_SYSTEM)/shared_library.mk－－－－－－－－－－－－－－－－－－－include $(BUILD_HOST_SHARED_LIBRARY)BUILD_HOST_SHARED_LIBRARY:= $(BUILD_SYSTEM)/host_shared_library.mk－－－－－－－－－－－－－－－－－－－include $(BUILD_EXECUTABLE)build/core/config.mk:51:BUILD_EXECUTABLE:= $(BUILD_SYSTEM)/executable.mk－－－－－－－－－－－－－－－－－－－include $(BUILD_HOST_EXECUTABLE)./build/core/config.mk:53:BUILD_HOST_EXECUTABLE:= $(BUILD_SYSTEM)/host_executable.mk－－－－－－－－－－－－－－－－－－－BUILD_HOST_JAVA_LIBRARY:= $(BUILD_SYSTEM)/host_java_library.mk－－－－－－－－－－－－－－－－－－－BUILD_JAVA_LIBRARY./build/core/config.mk:58:BUILD_JAVA_LIBRARY:= $(BUILD_SYSTEM)/java_library.mk－－－－－－－－－－－－－－－－－－BUILD_STATIC_JAVA_LIBRARY 编译静态JAVA库./build/core/config.mk:59:BUILD_STATIC_JAVA_LIBRARY:= $(BUILD_SYSTEM)/static_java_library.mk－－－－－－－－－－－－－－－－－－BUILD_HOST_JAVA_LIBRARY 编译本机用的JAVA库./build/core/config.mk:60:BUILD_HOST_JAVA_LIBRARY:= $(BUILD_SYSTEM)/host_java_library.mk－－－－－－－－－－－－－－－－－－BUILD_HOST_STATIC_LIBRARY:= $(BUILD_SYSTEM)/host_static_library.mkBUILD_HOST_SHARED_LIBRARY:= $(BUILD_SYSTEM)/host_shared_library.mkBUILD_STATIC_LIBRARY:= $(BUILD_SYSTEM)/static_library.mkBUILD_RAW_STATIC_LIBRARY := $(BUILD_SYSTEM)/raw_static_library.mkBUILD_SHARED_LIBRARY:= $(BUILD_SYSTEM)/shared_library.mkBUILD_EXECUTABLE:= $(BUILD_SYSTEM)/executable.mkBUILD_RAW_EXECUTABLE:= $(BUILD_SYSTEM)/raw_executable.mkBUILD_HOST_EXECUTABLE:= $(BUILD_SYSTEM)/host_executable.mkBUILD_PACKAGE:= $(BUILD_SYSTEM)/package.mkBUILD_HOST_PREBUILT:= $(BUILD_SYSTEM)/host_prebuilt.mkBUILD_PREBUILT:= $(BUILD_SYSTEM)/prebuilt.mkBUILD_MULTI_PREBUILT:= $(BUILD_SYSTEM)/multi_prebuilt.mkBUILD_JAVA_LIBRARY:= $(BUILD_SYSTEM)/java_library.mkBUILD_STATIC_JAVA_LIBRARY:= $(BUILD_SYSTEM)/static_java_library.mkBUILD_HOST_JAVA_LIBRARY:= $(BUILD_SYSTEM)/host_java_library.mkBUILD_DROIDDOC:= $(BUILD_SYSTEM)/droiddoc.mkBUILD_COPY_HEADERS := $(BUILD_SYSTEM)/copy_headers.mkBUILD_KEY_CHAR_MAP := $(BUILD_SYSTEM)/key_char_map.mk＝＝＝＝＝＝＝＝＝＝＝＝LOCAL_PRELINK_MODULEPrelink利用事先链接代替运行时链接的方法来加速共享库的加载，它不仅可以加快起动速度，还可以减少部分内存开销，是各种Linux架构上用于减少程序加载时间、缩短系统启动时间和加快应用程序启动的很受欢迎的一个工具。程序运行时的动态链接尤其是重定位(relocation)的开销对于大型系统来说是很大的。动态链接和加载的过程开销很大，并且在大多数的系统上, 函数库并不会常常被更动, 每次程序被执行时所进行的链接动作都是完全相同的，对于嵌入式系统来说尤其如此。因此，这一过程可以改在运行时之前就可以预先处理好，即花一些时间利用Prelink工具对动态共享库和可执行文件进行处理，修改这些二进制文件并加入相应的重定位等信息，节约了本来在程序启动时的比较耗时的查询函数地址等工作，这样可以减少程序启动的时间，同时也减少了内存的耗用。 Prelink的这种做法当然也有代价：每次更新动态共享库时，相关的可执行文件都需要重新执行一遍Prelink才能保证有效，因为新的共享库中的符号信息、地址等很可能与原来的已经不同了，这就是为什么 android framework代码一改动，这时候就会导致相关的应用程序重新被编译。这种代价对于嵌入式系统的开发者来说可能稍微带来一些复杂度，不过好在对用户来说几乎是可以忽略的。－－－－－－－－－－－－－－－－－－－－变量设置为false那么将不做prelink操作LOCAL_PRELINK_MODULE := false默认是需要prlink的，同时需要在 build/core/prelink-linux-arm.map 中加入libhellod.so 0x96000000这个map文件好像是制定动态库的地址的，在前面注释上面有一些地址范围的信息，注意库与库之间的间隔数，如果指定不好的话编译的时候会提示说地址空间冲突的问题。另外，注意排序，这里要把数大的放到前面去，按照大小降序排序。解析 LOCAL_PRELINK_MODULE 变量build/core/dynamic_binary.mk:94:ifeq ($(LOCAL_PRELINK_MODULE),true)ifeq ($(LOCAL_PRELINK_MODULE),true)$(prelink_output): $(prelink_input) $(TARGET_PRELINKER_MAP) $(APRIORI)$(transform-to-prelinked)transform-to-prelinked定义：./build/core/definitions.mk:1002:define transform-to-prelinkeddefine transform-to-prelinked@mkdir -p $(dir $@)@echo "target Prelink: $(PRIVATE_MODULE) ($@)"$(hide) $(APRIORI) \--prelinkmap $(TARGET_PRELINKER_MAP) \--locals-only \--quiet \$< \--output $@endef./build/core/config.mk:183:APRIORI := $(HOST_OUT_EXECUTABLES)/apriori$(HOST_EXECUTABLE_SUFFIX)prelink工具不是常用的prelink而是apriori，其源代码位于” <your_android>/build/tools/apriori”参考文档：动态库优化——Prelink（预连接）技术http://www.eefocus.com/article/09-04/71629s.html＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝LOCAL_ARM_MODE := arm目前Android大部分都是基于Arm处理器的，Arm指令用两种模式Thumb(每条指令两个字节)和arm指令（每条指令四个字节）LOCAL_CFLAGS += -O3 -fstrict-aliasing -fprefetch-loop-arrays通过设定编译器操作，优化级别，-O0表示没有优化,-O1为缺省值，-O3优化级别最高LOCAL_CFLAGS += -W -WallLOCAL_CFLAGS += -fPIC -DPICLOCAL_CFLAGS += -O2 -g -DADB_HOST=1 -Wall -Wno-unused-parameterLOCAL_CFLAGS += -D_XOPEN_SOURCE -D_GNU_SOURCE -DSH_HISTORYLOCAL_CFLAGS += -DUSEOVERLAY2根据条件选择相应的编译参数ifeq ($(TARGET_ARCH),arm)LOCAL_CFLAGS += -DANDROID_GADGET=1LOCAL_CFLAGS := $(PV_CFLAGS)endififeq ($(TARGET_BUILD_TYPE),release)LOCAL_CFLAGS += -O2endifLOCAL_LDLIBS := -lpthreadLOCAL_LDLIBS += -ldlifdef USE_MARVELL_MVEDLOCAL_WHOLE_STATIC_LIBRARIES += lib_il_mpeg4aspdecmved_wmmx2lnx lib_il_h264decmved_wmmx2lnxLOCAL_SHARED_LIBRARIES += libMrvlMVEDelseLOCAL_WHOLE_STATIC_LIBRARIES += lib_il_h264dec_wmmx2lnx lib_il_mpeg4aspdec_wmmx2lnxendif＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝其他一些变量和脚本：HOST_JNILIB_SUFFIXLOCAL_MODULE_SUFFIXLOCAL_MODULE_SUFFIX := $(HOST_JNILIB_SUFFIX)HOST_GLOBAL_LDFLAGSTARGET_GLOBAL_LDFLAGSPRIVATE_LDFLAGSLOCAL_LDLIBSLOCAL_C_INCLUDESLOCAL_STATIC_LIBRARIESLOCAL_STATIC_LIBRARIES += codecJPDec_WMMX2LNX miscGen_WMMX2LNXLOCAL_SHARED_LIBRARIES LOCAL_SHARED_LIBRARIES += libMrvlIPPLOCAL_SHARED_LIBRARIES += $(common_SHARED_LIBRARIES)LOCAL_SHARED_LIBRARIES += libMrvlIPPLOCAL_SHARED_LIBRARIES += libdlifeq ($(TARGET_PRODUCT),littleton)LOCAL_C_INCLUDES += vendor/marvell/littleton/m2d \LOCAL_SHARED_LIBRARIES += libOmxCoreendifvendor/marvell/littleton/littleton.mk:27:PRODUCT_NAME := littletonvendor/marvell/littleton/littleton.mk:28:PRODUCT_DEVICE := littletonvendor/marvell/littleton/AndroidProducts.mk:13:$(LOCAL_DIR)/littleton.mkvendor/sample/products/sample_addon.mk:40:PRODUCT_NAME := sample_addonvendor/htc/dream-open/htc_dream.mk:6:PRODUCT_NAME := htc_dream./vendor/htc/dream-open/htc_dream.mk:7:PRODUCT_DEVICE := dream-open./vendor/htc/dream-open/AndroidProducts.mk:3:$(LOCAL_DIR)/htc_dream.mkbuild/target/product/generic.mk:26:PRODUCT_NAME := genericbuild/target/product/generic_with_google.mk:20:PRODUCT_NAME := generic_with_googlebuild/target/product/min_dev.mk:6:PRODUCT_NAME := min_devbuild/target/product/core.mk:2:PRODUCT_NAME :=build/target/product/sim.mk:7:PRODUCT_NAME := simbuild/target/product/sdk.mk:37:PRODUCT_NAME := sdkbuild/tools/buildinfo.sh:20:echo "ro.product.name=$PRODUCT_NAME"lunch sample_addon-englunch htc_dream-englunch generic-englunch 1 lunch sim-engTARGET_BUILD_TYPE=releaselunch 2TARGET_BUILD_TYPE=debuglunch generic-user.PHONY: systemtarball-nodepssystemtarball-nodeps: $(FS_GET_STATS) \ $(filter-out systemtarball-nodeps stnod,$(MAKECMDGOALS))$(build-systemtarball-target).PHONY: stnodstnod: systemtarball-nodepssystemimage-nodeps snod./core/main.mk:BUILD_SYSTEM := $(TOPDIR)build/core./core/main.mk:include $(BUILD_SYSTEM)/config.mk./core/main.mk:include $(BUILD_SYSTEM)/cleanbuild.mk./core/main.mk:include $(BUILD_SYSTEM)/version_defaults.mk./core/main.mk:include $(BUILD_SYSTEM)/definitions.mk./core/main.mk:include $(BUILD_SYSTEM)/Makefile./core/static_java_library.mk:include $(BUILD_SYSTEM)/java_library.mk./core/host_java_library.mk:include $(BUILD_SYSTEM)/base_rules.mk./core/executable.mk:include $(BUILD_SYSTEM)/dynamic_binary.mk./core/java_library.mk:include $(BUILD_SYSTEM)/java.mk./core/binary.mk:include $(BUILD_SYSTEM)/base_rules.mk./core/raw_executable.mk:include $(BUILD_SYSTEM)/binary.mk./core/prebuilt.mk:include $(BUILD_SYSTEM)/base_rules.mk./core/host_executable.mk:include $(BUILD_SYSTEM)/binary.mk./core/combo/select.mk:$(combo_target)PRELINKER_MAP := $(BUILD_SYSTEM)/prelink-$(combo_os_arch).map./core/shared_library.mk:include $(BUILD_SYSTEM)/dynamic_binary.mk./core/config.mk:include $(BUILD_SYSTEM)/pathmap.mk./core/config.mk:BUILD_COMBOS:= $(BUILD_SYSTEM)/combo./core/config.mk:CLEAR_VARS:= $(BUILD_SYSTEM)/clear_vars.mk./core/config.mk:BUILD_HOST_STATIC_LIBRARY:= $(BUILD_SYSTEM)/host_static_library.mk./core/config.mk:BUILD_HOST_SHARED_LIBRARY:= $(BUILD_SYSTEM)/host_shared_library.mk./core/config.mk:BUILD_STATIC_LIBRARY:= $(BUILD_SYSTEM)/static_library.mk./core/config.mk:BUILD_RAW_STATIC_LIBRARY := $(BUILD_SYSTEM)/raw_static_library.mk./core/config.mk:BUILD_SHARED_LIBRARY:= $(BUILD_SYSTEM)/shared_library.mk./core/config.mk:BUILD_EXECUTABLE:= $(BUILD_SYSTEM)/executable.mk./core/config.mk:BUILD_RAW_EXECUTABLE:= $(BUILD_SYSTEM)/raw_executable.mk./core/config.mk:BUILD_HOST_EXECUTABLE:= $(BUILD_SYSTEM)/host_executable.mk./core/config.mk:BUILD_PACKAGE:= $(BUILD_SYSTEM)/package.mk./core/config.mk:BUILD_HOST_PREBUILT:= $(BUILD_SYSTEM)/host_prebuilt.mk./core/config.mk:BUILD_PREBUILT:= $(BUILD_SYSTEM)/prebuilt.mk./core/config.mk:BUILD_MULTI_PREBUILT:= $(BUILD_SYSTEM)/multi_prebuilt.mk./core/config.mk:BUILD_JAVA_LIBRARY:= $(BUILD_SYSTEM)/java_library.mk./core/config.mk:BUILD_STATIC_JAVA_LIBRARY:= $(BUILD_SYSTEM)/static_java_library.mk./core/config.mk:BUILD_HOST_JAVA_LIBRARY:= $(BUILD_SYSTEM)/host_java_library.mk./core/config.mk:BUILD_DROIDDOC:= $(BUILD_SYSTEM)/droiddoc.mk./core/config.mk:BUILD_COPY_HEADERS := $(BUILD_SYSTEM)/copy_headers.mk./core/config.mk:BUILD_KEY_CHAR_MAP := $(BUILD_SYSTEM)/key_char_map.mk./core/config.mk:HOST_JDK_TOOLS_JAR:= $(shell $(BUILD_SYSTEM)/find-jdk-tools-jar.sh)./core/version_defaults.mk:INTERNAL_BUILD_ID_MAKEFILE := $(wildcard $(BUILD_SYSTEM)/build_id.mk)./core/config.mk:include $(BUILD_SYSTEM)/envsetup.mk./core/config.mk:include $(BUILD_SYSTEM)/combo/select.mk./core/config.mk:include $(BUILD_SYSTEM)/combo/select.mk./core/config.mk:include $(BUILD_SYSTEM)/combo/javac.mk./core/product_config.mk:include $(BUILD_SYSTEM)/node_fns.mk./core/product_config.mk:include $(BUILD_SYSTEM)/product.mk./core/product_config.mk:include $(BUILD_SYSTEM)/device.mk./core/dynamic_binary.mk:include $(BUILD_SYSTEM)/binary.mk./core/host_static_library.mk:include $(BUILD_SYSTEM)/binary.mk./core/java.mk:include $(BUILD_SYSTEM)/base_rules.mk./core/host_shared_library.mk:include $(BUILD_SYSTEM)/binary.mk./core/key_char_map.mk:include $(BUILD_SYSTEM)/base_rules.mk./core/package.mk:include $(BUILD_SYSTEM)/java.mk./core/static_library.mk:include $(BUILD_SYSTEM)/binary.mk./core/definitions.mk:include $(BUILD_SYSTEM)/distdir.mk./core/envsetup.mk:include $(BUILD_SYSTEM)/product_config.mk./tools/apicheck/Android.mk:include $(BUILD_SYSTEM)/base_rules.mk./tools/dexpreopt/Android.mk:include $(BUILD_SYSTEM)/host_prebuilt.mkCOMMON_GLOBAL_CFLAGS:= -DANDROID -fmessage-length=0 -W -Wall -Wno-unusedCOMMON_DEBUG_CFLAGS:=COMMON_RELEASE_CFLAGS:= -DNDEBUG -UDEBUGCOMMON_PACKAGE_SUFFIX := .zipCOMMON_JAVA_PACKAGE_SUFFIX := .jarCOMMON_ANDROID_PACKAGE_SUFFIX := .apkACP := $(HOST_OUT_EXECUTABLES)/acp$(HOST_EXECUTABLE_SUFFIX)AIDL := $(HOST_OUT_EXECUTABLES)/aidl$(HOST_EXECUTABLE_SUFFIX)MKBOOTFS := $(HOST_OUT_EXECUTABLES)/mkbootfs$(HOST_EXECUTABLE_SUFFIX)MKBOOTIMG := $(HOST_OUT_EXECUTABLES)/mkbootimg$(HOST_EXECUTABLE_SUFFIX)MKYAFFS2 := $(HOST_OUT_EXECUTABLES)/mkyaffs2image$(HOST_EXECUTABLE_SUFFIX)APICHECK := $(HOST_OUT_EXECUTABLES)/apicheck$(HOST_EXECUTABLE_SUFFIX)FS_GET_STATS := $(HOST_OUT_EXECUTABLES)/fs_get_stats$(HOST_EXECUTABLE_SUFFIX)MKEXT2IMG := $(HOST_OUT_EXECUTABLES)/genext2fs$(HOST_EXECUTABLE_SUFFIX)MKEXT2BOOTIMG := external/genext2fs/mkbootimg_ext2.shMKTARBALL := build/tools/mktarball.shDX := $(HOST_OUT_EXECUTABLES)/dxLOCALIZE := $(HOST_OUT_EXECUTABLES)/localize$(HOST_EXECUTABLE_SUFFIX)HOST_GLOBAL_LDFLAGSTARGET_GLOBAL_LDFLAGSPRIVATE_LDFLAGSbuild/core/combo/linux-arm.mk:16:$(combo_target)NO_UNDEFINED_LDFLAGS := -Wl,--no-undefinedsave_CFLAGS="$CFLAGS -g -mabi=aapcs-linux"LDFLAGS='$LDFLAGS -lX11 -lxml2 -lXdmcp -lXau -lexpat -lXrender -lXft -lfontconfig -lfreetype -lz' --without-libtiff " # --with-gdktarget=directfb"LDFLAGS=" -Wl,-rpath-link=$LD_LIBRARY_PATH -L$PREFIX/lib ${env_LDFLAGS} ${save_LDFLAGS}"./vendor/marvell/external/alsa/alsa-lib/src/Mdroid.mk:43:LOCAL_CFLAGS += -mabi=aapcs-linux./vendor/marvell/external/alsa/alsa-tools/Mdroid.mk:8:LOCAL_CFLAGS += -mabi=aapcs-linux./vendor/marvell/littleton/libaudio/Mdroid.mk:22:LOCAL_CPPFLAGS += -mabi=aapcs-linux./external/wpa_supplicant/Android.mk:35:L_CFLAGS += -mabi=aapcs-linux./system/wlan/ti/sta_dk_4_0_4_32/CUDK/tiwlan_loader/Android.mk:88:LOCAL_CFLAGS = -Wall -Wstrict-prototypes $(CLI_DEBUGFLAGS) -D__LINUX__ $(DK_DEFINES) -mabi=aapcs-linux./kernel/arch/arm/Makefileifeq ($(CONFIG_AEABI),y)CFLAGS_ABI:=-mabi=aapcs-linux -mno-thumb-interworkelseCFLAGS_ABI:=$(call cc-option,-mapcs-32,-mabi=apcs-gnu) $(call cc-option,-mno-thumb-interwork,)endif# Need -Uarm for gcc < 3.xKBUILD_CFLAGS+=$(CFLAGS_ABI) $(arch-y) $(tune-y) $(call cc-option,-mshort-load-bytes,$(call cc-option,-malignment-traps,)) -msoft-float -UarmKBUILD_AFLAGS+=$(CFLAGS_ABI) $(arch-y) $(tune-y) -msoft-floatCFLAGS="${temp_CFLAGS} -I/include -I/usr/include -I/usr/X11R7/include"LDFLAGS="${temp_LDFLAGS} -L/lib -L/usr/lib -L/usr/X11R7/lib"Android Build Systemhttp://www.cublog.cn/u/8059/showart_1420446.html＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝
