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Jiyong Park dfb3937ce4 Some properties are set as optional 
Some properties that are designed to provide a safe default value are
explicitly set as optional using the 'a ?= b' syntax.

Bug: 117892318
Bug: 158735147
Test: m
Change-Id: Ie6a50ab7e0bcb210e282bc18e8c1daf412903f90
2020-06-25 09:46:57 +09:00
common strings.mk: Allow empty RHS values for inputs of collapse-pairs 2020-04-02 03:34:49 +09:00
core Support optional prop assignments 2020-06-25 09:46:57 +09:00
packaging Fix creating _dist_<goal> targets under !dist 2018-10-21 08:56:27 -07:00
target Some properties are set as optional 2020-06-25 09:46:57 +09:00
tests Only set TARGET_PLATFORM version in lunch when explicitly requested 2017-05-01 14:26:40 -07:00
tools Support optional prop assignments 2020-06-25 09:46:57 +09:00
.gitignore Add build subprojects to .gitignore 2015-07-23 13:18:47 -07:00
buildspec.mk.default Add TARGET_PLATFORM_VERSION to lunch 2017-03-23 09:44:08 -07:00
Changes.md Ban ELF prebuilts in PRODUCT_COPY_FILES 2020-04-08 18:02:56 +08:00
CleanSpec.mk Merge "Do not include CellBroadcastLegacy for Go devices" into rvc-dev am: 99e317ce2d am: 3af5f639bb am: 24a87ba928 am: bc9322142c 2020-06-19 07:01:40 +00:00
Deprecation.md Obsolete unused module types 2020-04-18 21:00:18 -07:00
envsetup.sh Do not print environment variables if ANDROID_QUIET_BUILD is set. 2020-06-04 10:48:15 -07:00
help.sh Rename product_services to system_ext 2019-07-09 08:57:19 +00:00
navbar.md Mark envsetup.sh vars as deprecated in makefiles 2017-11-28 14:19:50 -08:00
OWNERS Merge "Update OWNERS for version_defaults.mk with pscovanner & lubomir Bug: 141272605" into qt-dev am: 5d0a024d7b am: 479c9c549b 2019-10-16 11:30:32 -07:00
rbesetup.sh Add an RBE setup script that developers can source to run RBE builds 2020-03-05 17:37:26 -08:00
README.md Mark envsetup.sh vars as deprecated in makefiles 2017-11-28 14:19:50 -08:00
tapasHelp.sh Remove unused mips workarounds. 2020-03-06 16:46:59 -08:00
Usage.txt Remove the PRODUCT-* goal 2019-07-29 14:27:04 -07:00

README.md

Android Make Build System

This is the Makefile-based portion of the Android Build System.

For documentation on how to run a build, see Usage.txt

For a list of behavioral changes useful for Android.mk writers see Changes.md

For an outdated reference on Android.mk files, see build-system.html. Our Android.mk files look similar, but are entirely different from the Android.mk files used by the NDK build system. When searching for documentation elsewhere, ensure that it is for the platform build system -- most are not.

This Makefile-based system is in the process of being replaced with Soong, a new build system written in Go. During the transition, all of these makefiles are read by Kati, and generate a ninja file instead of being executed directly. That's combined with a ninja file read by Soong so that the build graph of the two systems can be combined and run as one.