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89 lines
3.6 KiB
89 lines
3.6 KiB
4 months ago
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Android build system usage:
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m [-j] [<targets>] [<variable>=<value>...]
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Ways to specify what to build:
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The common way to specify what to build is to set that information in the
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environment via:
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# Set up the shell environment.
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source build/envsetup.sh # Run "hmm" after sourcing for more info
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# Select the device and variant to target. If no argument is given, it
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# will list choices and prompt.
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lunch [<product>-<variant>] # Selects the device and variant to target.
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# Invoke the configured build.
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m [<options>] [<targets>] [<variable>=<value>...]
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<product> is the device that the created image is intended to be run on.
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This is saved in the shell environment as $TARGET_PRODUCT by `lunch`.
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<variant> is one of "user", "userdebug", or "eng", and controls the
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amount of debugging to be added into the generated image.
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This gets saved in the shell environment as $TARGET_BUILD_VARIANT by
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`lunch`.
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Each of <options>, <targets>, and <variable>=<value> is optional.
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If no targets are specified, the build system will build the images
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for the configured product and variant.
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A target may be a file path. For example, out/host/linux-x86/bin/adb .
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Note that when giving a relative file path as a target, that path is
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interpreted relative to the root of the source tree (rather than relative
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to the current working directory).
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A target may also be any other target defined within a Makefile. Run
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`m help` to view the names of some common targets.
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To view the modules and targets defined in a particular directory, look for:
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files named *.mk (most commonly Android.mk)
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these files are defined in Make syntax
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files named Android.bp
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these files are defined in Blueprint syntax
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During a build, a few log files are generated in ${OUT} (or ${DIST_DIR}/logs
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for dist builds):
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verbose.log.gz
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every command run, along with its outputs. This is similar to the
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previous `m showcommands` option.
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error.log
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list of actions that failed during the build, and their outputs.
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soong.log
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verbose debug information from soong_ui
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For now, the full (extremely large) compiled list of targets can be found
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(after running the build once), split among these two files:
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${OUT}/build-<product>*.ninja
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${OUT}/soong/build.ninja
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If you find yourself interacting with these files, you are encouraged to
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provide a more convenient tool for browsing targets, and to mention the
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tool here.
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Targets that adjust an existing build:
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dist Copy into ${DIST_DIR} the portion of the build
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that must be distributed
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Flags
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-j <N> Run <N> processes at once
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-j Autodetect the number of processes to run at once,
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and run that many
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Variables
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Variables can either be set in the surrounding shell environment or can be
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passed as command-line arguments. For example:
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export I_AM_A_SHELL_VAR=1
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I_AM_ANOTHER_SHELL_VAR=2 m droid I_AM_A_MAKE_VAR=3
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Here are some common variables and their meanings:
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TARGET_PRODUCT The <product> to build # as described above
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TARGET_BUILD_VARIANT The <variant> to build # as described above
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DIST_DIR The directory in which to place the distribution
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artifacts.
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OUT_DIR The directory in which to place non-distribution
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artifacts.
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There is not yet known a convenient method by which to discover the full
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list of supported variables. Please mention it here when there is.
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