help.sh文件所在位置：./build/make/help.sh；
內(nèi)容顯示艰争，源碼編譯分為三步：
1.source build/envsetup.sh
# Add "lunch" (and other utilities and variables)
?# to the shell environment.
2.lunch [<product>-<variant>] # Choose the device to target.
3.m -j [<goals>]? ? ? ? ? ? ? # Execute the configured build.
Usage of "m" imitates usage of the program "make".
See '"${SCRIPT_DIR}"'/Usage.txt for more info about build usage and concepts.
Common goals are:
? ? clean? ? ? ? ? ? ? ? ? (aka clobber) equivalent to rm -rf out/
? ? checkbuild? ? ? ? ? ? ? Build every module defined in the source tree
? ? droid? ? ? ? ? ? ? ? ? Default target
? ? nothing? ? ? ? ? ? ? ? Do not build anything, just parse and validate the build structure
? ? java? ? ? ? ? ? ? ? ? ? Build all the java code in the source tree
? ? native? ? ? ? ? ? ? ? ? Build all the native code in the source tree
? ? host? ? ? ? ? ? ? ? ? ? Build all the host code (not to be run on a device) in the source tree
? ? target? ? ? ? ? ? ? ? ? Build all the target code (to be run on the device) in the source tree
? ? (java|native)-(host|target)
? ? (host|target)-(java|native)
? ? ? ? ? ? ? ? ? ? ? ? ? ? Build the intersection of the two given arguments
? ? snod? ? ? ? ? ? ? ? ? ? Quickly rebuild the system image from built packages
? ? ? ? ? ? ? ? ? ? ? ? ? ? Stands for "System, NO Dependencies"
? ? vnod? ? ? ? ? ? ? ? ? ? Quickly rebuild the vendor image from built packages
? ? ? ? ? ? ? ? ? ? ? ? ? ? Stands for "Vendor, NO Dependencies"
? ? pnod? ? ? ? ? ? ? ? ? ? Quickly rebuild the product image from built packages
? ? ? ? ? ? ? ? ? ? ? ? ? ? Stands for "Product, NO Dependencies"
So, for example, you could run:
cd '"${TOP}"'
source build/envsetup.sh
lunch aosp_arm-userdebug
m -j java
to build all of the java code for the userdebug variant of the aosp_arm device.
