Android Build System详解
Android Build System Architecture
其中$(TOP)/Makefile位于android的顶层目录中。其它Makefile文件均位于$(TOP)/build/core目录下
Initialize the environment
初始化编译环境使用的是$(TOP)/build/envsetup.sh脚本。
envsetup.sh提供的函数以下:
| 函数 | 功能 |
| hmm | 帮助命令，envsetup.sh提供的函数的用法 |
| get_abs_build_var | |
| get_build_var | |
| check_product | |
| check_variant | |
| setpaths | |
| printconfig | |
| set_stuff_for_environment | |
| set_sequence_number | |
| settitle | |
| addcompletions | |
| choosetype | |
| chooseproduct | |
| choosevariant | |
| choosecombo | |
| add_lunch_combo | |
| print_lunch_menu | |
| lunch | |
| _lunch | |
| tapas | |
| gettop | |
| getdriver | |
| m | 从顶层目录build整个系统 |
| mmm | build指定目录下全部的模块 |
| mma | build当前目录下全部的模块以及这些模块所依赖的模块 |
| mmma | build指定目录下全部的模块以及这些模块所依赖的模块 |
| croot | 到android所在的顶层目录 |
| cproj | |
| qpid | |
| pid | |
| systemstack | |
| stacks | |
| gdbwrapper | |
| sgrep | |
| gettargetarch | |
| jgrep | |
| cgrep | |
| resgrep | |
| mangrep | |
| sepgrep | |
| mgrep | |
| treegrep | |
| getprebuilt | |
| tracedmdump | |
| runhat | |
| getbugreports | |
| getsdcardpath | |
| getscreenshotpath | |
| startviewserver | |
| isviewserverstarted | |
| key_home | |
| key_back | |
| key_menu | |
| smoketest | |
| runtest | |
| godir | |
| set_java_home | |
| pez | |
| findnmakefile | |
| gdbcleint | |
# Clear this variable. It will be built up again when the vendorsetup.sh
# files are included at the end of this file.
unset LUNCH_MENU_CHOICES
function add_lunch_combo()
{
local new_combo=$1
local c
for c in ${LUNCH_MENU_CHOICES[@]} ; do
if [ "$new_combo" = "$c" ] ; then
return
fi
done
LUNCH_MENU_CHOICES=(${LUNCH_MENU_CHOICES[@]} $new_combo)
}
# add the default one here
add_lunch_combo aosp_arm-eng
add_lunch_combo aosp_x86-eng
add_lunch_combo aosp_mips-eng
add_lunch_combo aosp_x86_64-eng
add_lunch_combo vbox_x86-eng 调用add_lunch_combo函数将 combo配置到LUNCH_MENU_CHOICES变量中。lunch命令就是选择combo。
# Execute the contents of any vendorsetup.sh files we can find.
for f in `test -d device && find device -maxdepth 4 -name 'vendorsetup.sh' 2> /dev/null` \
`test -d vendor && find vendor -maxdepth 4 -name 'vendorsetup.sh' 2> /dev/null`
do
echo "including $f"
. $f
done
unset f 搜索device目录下全部的vendorsetup.sh，并执行。下面是ti的vendorsetup.sh的例子：
add_lunch_combo full_panda-userdebug其中full_panda-userdebug分为两部分，一部分是product name:full_panda,一部分是Build variant:userdebug. build variant共有三种选择分别是user， userdebug， eng
eng:工程机
user:最终用户机
userdebug:调试测试机
编译环境设置完成后，就能够编译整个android系统。