1#!/bin/bash
2
3# locate some directories
4cd "$(dirname $0)"
5SCRIPT_DIR="${PWD}"
6cd ../..
7TOP="${PWD}"
8
9message='The basic Android build process is:
10
11cd '"${TOP}"'
12source build/envsetup.sh    # Add "lunch" (and other utilities and variables)
13                            # to the shell environment.
14lunch [<product>-<variant>] # Choose the device to target.
15m [<goals>]                 # Execute the configured build.
16
17Usage of "m" imitates usage of the program "make".
18See '"${SCRIPT_DIR}"'/Usage.txt for more info about build usage and concepts.
19
20The parallelism of the build can be set with a -jN argument to "m".  If you
21don'\''t provide a -j argument, the build system automatically selects a parallel
22task count that it thinks is optimal for your system.
23
24Common goals are:
25
26    clean                   (aka clobber) equivalent to rm -rf out/
27    checkbuild              Build every module defined in the source tree
28    droid                   Default target
29    nothing                 Do not build anything, just parse and validate the build structure
30
31    java                    Build all the java code in the source tree
32    native                  Build all the native code in the source tree
33
34    host                    Build all the host code (not to be run on a device) in the source tree
35    target                  Build all the target code (to be run on the device) in the source tree
36
37    (java|native)-(host|target)
38    (host|target)-(java|native)
39                            Build the intersection of the two given arguments
40
41    snod                    Quickly rebuild the system image from built packages
42                            Stands for "System, NO Dependencies"
43    vnod                    Quickly rebuild the vendor image from built packages
44                            Stands for "Vendor, NO Dependencies"
45    pnod                    Quickly rebuild the product image from built packages
46                            Stands for "Product, NO Dependencies"
47    senod                   Quickly rebuild the system_ext image from built packages
48                            Stands for "SystemExt, NO Dependencies"
49    onod                    Quickly rebuild the odm image from built packages
50                            Stands for "Odm, NO Dependencies"
51    vdnod                   Quickly rebuild the vendor_dlkm image from built packages
52                            Stands for "VendorDlkm, NO Dependencies"
53    odnod                   Quickly rebuild the odm_dlkm image from built packages
54                            Stands for "OdmDlkm, NO Dependencies"
55
56
57So, for example, you could run:
58
59cd '"${TOP}"'
60source build/envsetup.sh
61lunch aosp_arm-userdebug
62m -j java
63
64to build all of the java code for the userdebug variant of the aosp_arm device.
65'
66
67echo "$message"
68