Building the System

jjj

The basic sequence of build commands is as follows:

Initialize

Initialize the environment with the envsetup.sh script. Note that replacing "source" with a single dot saves a few characters, and the short form is more commonly used in documentation.

1. $ source build/envsetup.sh

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or

1. $ . build/envsetup.sh

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Choose a Target

Choose which target to build with lunch. The exact configuration can be passed as an argument, e.g.

1. $ lunch full-eng

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The example above refers to a complete build for the emulator, with all debugging enabled.

If run with no arguments lunch will prompt you to choose a target from the menu.

All build targets take the form BUILD-BUILDTYPE, where the BUILD is a codename referring to the particular feature combination:

Build name	Device	Notes
full	emulator	fully configured with all languages, apps, input methods
full_maguro	maguro	full build running on Galaxy Nexus GSM/HSPA+ ("maguro")
full_panda	panda	full build running on PandaBoard ("panda")

and the BUILDTYPE is one of the following:

Buildtype	Use
user	limited access; suited for production
userdebug	like "user" but with root access and debuggability; preferred for debugging
eng	development configuration with additional debugging tools

Build the Code

Build everything with make. GNU make can handle parallel tasks with a -jN argument, and it's common to use a number of tasks N that's between 1 and 2 times the number of hardware threads on the computer being used for the build. E.g. on a dual-E5520 machine (2 CPUs, 4 cores per CPU, 2 threads per core), the fastest builds are made with commands between make -j16 and make -j32.

1. $ make -j4

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jjj

最新的版本已经同步下来了，如何利用repo切换分支呢?

1. repo forall -c "git checkout -b android-4.0.1_r1 android-4.0.1_r1"

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用以上命令即可实现切换到android-4.0.1_r1，如果你仅对git熟悉，而对repo不熟悉，可以
直接使用repo forall -c "git xxx“，是不是很简单

jjj

android 4.0.1_r1版本源码中仅支持GSM/HSPA+ Galaxy Nexus设备，即maguro
ti的panda只在master分支支持，且功能不完整
Nexus S（crespo）和Nexus S 4G（crespo4g）仅在gingerbread分支完整支持
Nexus One(passion) 已经标明不再支持