Android(安卓)编译摘要

> 编译选项的help

liuxu@liuxu:~/workspace/froyo_td$ help
Invoke ". build/envsetup.sh" from your shell to add the following functions to your environment:
- croot: Changes directory to the top of the tree.
- m: Makes from the top of the tree.
- mm: Builds all of the modules in the current directory.
- mmm: Builds all of the modules in the supplied directories.
- cgrep: Greps on all local C/C++ files.
- jgrep: Greps on all local Java files.
- resgrep: Greps on all local res/*.xml files.
- godir: Go to the directory containing a file.

Look at the source to view more functions. The complete list is:
add_lunch_combo cgrep check_product check_variant choosecombo chooseproduct choosetype choosevariant cproj croot findmakefile gdbclient get_abs_build_var getbugreports get_build_var getprebuilt gettop godir help isviewserverstarted jgrep lunch m mm mmm pid printconfig print_lunch_menu resgrep runhat runtest setpaths set_sequence_number set_stuff_for_environment settitle smoketest startviewserver stopviewserver systemstack tapas tracedmdump

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 编译命令

liuxu@liuxu:~/workspace/froyo_td$ . build/envsetup.sh
including device/htc/dream/vendorsetup.sh
including device/htc/passion/vendorsetup.sh
including device/htc/sapphire/vendorsetup.sh
including device/lenovo/rainbow/vendorsetup.sh
liuxu@liuxu:~/workspace/froyo_td$ lunch

You're building on Linux

Lunch menu... pick a combo:
1. generic-eng
2. simulator
3. full_dream-userdebug
4. full_passion-userdebug
5. full_sapphire-userdebug
6. rainbow-userdebug

Which would you like? [generic-eng] 6

============================================
PLATFORM_VERSION_CODENAME=REL
PLATFORM_VERSION=2.2.1
TARGET_PRODUCT=rainbow
TARGET_BUILD_VARIANT=userdebug
TARGET_SIMULATOR=false
TARGET_BUILD_TYPE=release
TARGET_BUILD_APPS=
TARGET_ARCH=arm
HOST_ARCH=x86
HOST_OS=linux
HOST_BUILD_TYPE=release
BUILD_ID=FRG83
============================================
liuxu@liuxu:~/workspace/froyo_td$ choosecombo
Build for the simulator or the device?
1. Device
2. Simulator

Which would you like? [1]

Build type choices are:
1. release
2. debug

Which would you like? [1]

Which product would you like? [rainbow]

Variant choices are:
1. user
2. userdebug
3. eng
Which would you like? [eng] 2

============================================
PLATFORM_VERSION_CODENAME=REL
PLATFORM_VERSION=2.2.1
TARGET_PRODUCT=rainbow
TARGET_BUILD_VARIANT=userdebug
TARGET_SIMULATOR=false
TARGET_BUILD_TYPE=release
TARGET_BUILD_APPS=
TARGET_ARCH=arm
HOST_ARCH=x86
HOST_OS=linux
HOST_BUILD_TYPE=release
BUILD_ID=FRG83
============================================

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Android编译系统

1. Android编译系统

编译脚本主要位置：

*.mk

build/core/

build/tools/

build/envsetup.sh:定义函数mm,mmm,choosecombo等；
2. 模块编译
2.1 Java模块

通常Java模块的编译提供一个Android.mk就可以了。

LOCAL_PACKAGE_NAME：模块名。

LOCAL_SRC_FILES：代码；
2.2 C/C++模块

通常C/C++模块的编译提供一个Android.mk就可以了。

LOCAL_MODULE：模块名；

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；

http://linux.chinaunix.net/techdoc/beginner/2009/10/25/1141239.shtml

http://heaven.branda.to/~thinker/GinGin_CGI.py/show_id_doc/393
2.3 build/envsetup.sh

定义函数mm,mmm,choosecombo等。
2.4 choosecombo

定义于：build/envsetup.sh。

function choosecombo()

{

choosesim $1

//选择模拟器类型，echo $TARGET_SIMULATOR，值为

// 1. Device

// 2. Simulator

echo

echo

choosetype $2

//选择编译类型，echo $TARGET_BUILD_TYPE

// 1. release

// 2. debug

echo

echo

chooseproduct $3

//选择产品类型，echo $TARGET_PRODUCT,如abcde

echo

echo

choosevariant $4

//选择编译变量，echo $TARGET_BUILD_VARIANT

// 1. user

// 2. userdebug

// 3. eng

echo

set_stuff_for_environment

printconfig

}

综上，choosecombo选择这些命令后，把所有的用户选择信息输出在环境变量之中。所以，如果重新打开shell，需要重新选择，否则原有的配置信息丢失。
2.5 vendor/vendorabc/abcde/BoardConfig.mk

config输出：

system/core/include/arch/linux-arm/AndroidConfig.h
2.5.1 BOARD_HAVE_BLUETOOTH

主要引用处：frameworks/base/libs/audioflinger/。

实验：如何通过设置BOARD_HAVE_BLUETOOTH来避免编译蓝牙。

办法：删除 rm -rf out/target/product/abcde/obj/STATIC_LIBRARIES/libaudiointerface_intermediates/ -rf

在vendor/vendorabc/abcde/BoardConfig.mk加入BOARD_HAVE_BLUETOOTH := false，才可以让宏BOARD_HAVE_BLUETOOTH生效.
2.5.2 TARGET_CPU_ABI

引用处：build/core/
2.6 build/core/

device.mk

prelink-linux-arm.map
2.7 build/core/Makefile
2.7.1 system.img制作

system.img的制作是由build/core/Makefile的宏build-systemimage-target调用MKYAFFS2来完成的。

命令MKYAFFS2定义于build/core/config.mk:

MKYAFFS2 := $(HOST_OUT_EXECUTABLES)/mkyaffs2image$(HOST_EXECUTABLE_SUFFIX)

图 system.img制作流程
2.7.2 prop设定

2.8 build/core/ definitions.mk

transform-java-to-classes.jar

create-resource-java-files

transform-host-o-to-executable-inner

transform-o-to-executable-inner

transform-o-to-shared-lib-inner

transform-host-c-or-s-to-o-no-deps

transform-host-cpp-to-o

transform-cpp-to-o

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