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Jiyong Park 0b4fccb66d BUILD_BROKEN_DUP_SYSPROP as escape hatch for the new sysprop restriction 
As the final step for the refactoring of sysprop configuration, this
change adds BUILD_BROKEN_DUP_SYSPROP which is the escape hatch for
the new restriction. When it is turned on, the new syntax `a ?= b`
collapses to the old syntax `a = b`, duplicated assignments are allowed,
and the dups are resolved following the legacy rule of preferring the
first.

This change also summarizes all the user-facing changes to the Change.md
file.

Lastly, post_process_prop.py is refactored to accept new argument
'--allow-dup' which when turned on allowes duplicated sysprops.

Bug: 117892318
Bug: 158735147
Test: atest --host post_process_prop_unittest

Exempt-From-Owner-Approval: cherry-pick from master

Merged-In: I7bdfffd47d50aad66a78e28a30c3dad7ebac080c
(cherry picked from commit b302cdf6a4)
Change-Id: I7bdfffd47d50aad66a78e28a30c3dad7ebac080c
 		2020-06-30 18:44:40 +09:00
common strings.mk: Allow empty RHS values for inputs of collapse-pairs 2020-04-02 03:34:49 +09:00
core BUILD_BROKEN_DUP_SYSPROP as escape hatch for the new sysprop restriction 2020-06-30 18:44:40 +09:00
packaging Fix creating _dist_<goal> targets under !dist 2018-10-21 08:56:27 -07:00
target pm.dexopt.* props in runtime_libart.mk becomes optional 2020-06-30 18:44:30 +09:00
tests Only set TARGET_PLATFORM version in lunch when explicitly requested 2017-05-01 14:26:40 -07:00
tools BUILD_BROKEN_DUP_SYSPROP as escape hatch for the new sysprop restriction 2020-06-30 18:44:40 +09:00
.gitignore Add build subprojects to .gitignore 2015-07-23 13:18:47 -07:00
Changes.md BUILD_BROKEN_DUP_SYSPROP as escape hatch for the new sysprop restriction 2020-06-30 18:44:40 +09:00
CleanSpec.mk Remove /system/etc/prop.default 2020-05-14 16:28:19 +09:00
Deprecation.md Obsolete unused module types 2020-04-18 21:00:18 -07:00
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
README.md Mark envsetup.sh vars as deprecated in makefiles 2017-11-28 14:19:50 -08:00
Usage.txt Remove the PRODUCT-* goal 2019-07-29 14:27:04 -07:00
buildspec.mk.default Add TARGET_PLATFORM_VERSION to lunch 2017-03-23 09:44:08 -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
rbesetup.sh Add an RBE setup script that developers can source to run RBE builds 2020-03-05 17:37:26 -08:00
tapasHelp.sh Remove unused mips workarounds. 2020-03-06 16:46:59 -08:00

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.