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Bowgo Tsai b9af035ee7 BOARD_PREBUILT_BOOTIMAGE: removes the restriction of non system-as-root 
Starting from Android 10, the system.img layout consists of
$TARGET_SYSTEM_OUT and $TARGET_ROOT_OUT, and is mounted by the
init as root. That is, system.img is always created as if
BOARD_BUILD_SYSTEM_ROOT_IMAGE was set.

  https://source.android.com/devices/bootloader/partitions/system-as-root

The previous concern is that there might be compatibility issues between
the ramdisk contained in boot.img with a newer system.img. But this is
no longer an issue after we always mount the system.img as root.

Bug: 187157581
Test: Tree Hugger
Change-Id: I4537e6ce6fb39b4b86caac82a13716abf515ffd6
Merged-In: I4537e6ce6fb39b4b86caac82a13716abf515ffd6
(cherry picked from commit 640544bd96)
2021-05-17 14:51:16 +08:00
common Preserve <uses-library> order in dexpreopt.config files. 2021-02-11 17:09:19 +00:00
core BOARD_PREBUILT_BOOTIMAGE: removes the restriction of non system-as-root 2021-05-17 14:51:16 +08:00
packaging Fix creating _dist_<goal> targets under !dist 2018-10-21 08:56:27 -07:00
target Merge "Do not enforce debugfs restrictions on GSI builds" am: 04d72d0a46 am: 19b49a7b37 am: bb841af40d 2021-05-14 06:12:44 +00:00
tests Product configuration in Starlark support files. 2021-03-18 10:52:05 -07:00
tools Reland: Enable verity computation on VABC devices 2021-05-14 12:38:28 -04:00
.gitignore Add build subprojects to .gitignore 2015-07-23 13:18:47 -07:00
Android.bp [LSC] Add LOCAL_LICENSE_KINDS to build/make 2021-02-14 10:37:20 -08:00
banchanHelp.sh Allow selecting a different product in banchan. 2021-04-19 18:32:00 +01:00
buildspec.mk.default Add TARGET_PLATFORM_VERSION to lunch 2017-03-23 09:44:08 -07:00
Changes.md Add documentation for <uses-library> checks. 2021-03-31 11:56:45 +01:00
CleanSpec.mk Merge "Rename vendor-ramdisk to vendor_ramdisk" am: b10f7d2a9c am: 2c789cf026 am: be8682a693 2021-03-04 06:53:52 +00:00
Deprecation.md Obsolete unused module types 2020-04-18 21:00:18 -07:00
envsetup.sh Use python3 specifically for envsetup.sh 2021-04-29 15:44:29 -07:00
help.sh Fix the help script. 2021-03-25 14:40:44 -07:00
METADATA Fix license_type. Contains GPL 2021-02-09 14:00:16 -08:00
navbar.md Mark envsetup.sh vars as deprecated in makefiles 2017-11-28 14:19:50 -08:00
OWNERS Refactor OWNERS files in platform/build/make. 2020-10-08 16:14:44 -07:00
PREUPLOAD.cfg Disallow use of error-prone merge-strategies 2021-02-23 15:07:02 +00:00
rbesetup.sh Switch default execution strategy to racing for developer builds 2020-11-25 12:14:16 -05:00
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.