编译android系统
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The following instructions to build the Android source tree apply to all branches, includingmaster
. The basic sequence of build commands is as follows:
Note: If you're building Android 6.0 or later, please seeCompiling with Jack for information on this new default toolchain.
Set up environment
Initialize the environment with the envsetup.sh
script. Note that replacingsource
with .
(a single dot) saves a few characters, and the short form is more commonly used in documentation.
$ source build/envsetup.sh
or
$ . build/envsetup.sh
Choose a Target
Choose which target to build with lunch
. The exact configuration can be passed as an argument. For example, the following command:
$ lunch aosp_arm-eng
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.
The BUILDTYPE is one of the following:
For more information about building for and running on actual hardware, see Running Builds.
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. For example, 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
.
$ make -j4
Run It!
You can either run your build on an emulator or flash it on a device. Please note that you have already selected your build target withlunch
, and it is unlikely at best to run on a different target than it was built for.
Flash a Device
To flash a device, you will need to use fastboot
, which should be included in your path after a successful build. Place the device in fastboot mode either manually by holding the appropriate key combination at boot, or from the shell with
$ adb reboot bootloader
Once the device is in fastboot mode, run
$ fastboot flashall -w
The -w
option wipes the /data
partition on the device; this is useful for your first time flashing a particular device but is otherwise unnecessary.
For more information about building for and running on actual hardware, see Running Builds.
Emulate an Android Device
The emulator is added to your path automatically by the build process. To run the emulator, type
$ emulator
Using ccache
ccache is a compiler cache for C and C++ that can help make builds faster. In the root of the source tree, do the following:
$ export USE_CCACHE=1$ export CCACHE_DIR=/<path_of_your_choice>/.ccache$ prebuilts/misc/linux-x86/ccache/ccache -M 50G
The suggested cache size is 50-100G.
On Linux, you can watch ccache being used by doing the following:
$ watch -n1 -d prebuilts/misc/linux-x86/ccache/ccache -s
On Mac OS, you should replace linux-x86
with darwin-x86
.
When using Ice Cream Sandwich (4.0.x) or older, you should replace prebuilts/misc
withprebuilt
.
Troubleshooting Common Build Errors
Wrong Java Version
If you are attempting to build a version of Android inconsistent with your version of Java,make
will abort with a message such as
************************************************************You are attempting to build with the incorrect versionof java.Your version is: WRONG_VERSION.The correct version is: RIGHT_VERSION.Please follow the machine setup instructions at https://source.android.com/source/download.html************************************************************
This may be caused by:
- Failing to install the correct JDK as specified in Initializing the Build Environment.
- Another JDK previously installed appearing in your path. Prepend the correct JDK to the beginning of your PATH or remove the problematic JDK.
Python Version 3
Repo is built on particular functionality from Python 2.x and is unfortunately incompatible with Python 3. In order to use repo, please install Python 2.x:
$ apt-get install python
Case Insensitive Filesystem
If you are building on an HFS filesystem on Mac OS, you may encounter an error such as
************************************************************You are building on a case-insensitive filesystem.Please move your source tree to a case-sensitive filesystem.************************************************************
Please follow the instructions in Initializing the Build Environment for creating a case-sensitive disk image.
No USB Permission
On most Linux systems, unprivileged users cannot access USB ports by default. If you see a permission denied error, follow the instructionsInitializing the Build Environment for configuring USB access.
If adb was already running and cannot connect to the device after getting those rules set up, it can be killed withadb kill-server
. That will cause adb to restart with the new configuration.
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