Android 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