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Tianjie 055128bf10 Use sha256 to build the hashtree in avb image 
The hashtree is used in verified boot, and sha256 is more robust against
malicious attacks. Also, sha256 uses the same space as sha1 in the
hashtree. And there isn't much performance regression per
https://b.corp.google.com/issues/156162446#comment18

By putting the config in BoardConfigMainlineCommon.mk, we enable sha256
on all Pixels. And devices who want to use a different hash algorithm
can override it in it's own board configs.

Bug: 156162446
Test: boot the device and check performance
Change-Id: I9f1d3bcf241bc65adf10376cc5ae7ab1986216fa
 		2020-12-11 01:26:12 +00:00
common Add a rule to get numbers greater or equal to a minimum number. 2020-10-29 22:29:27 +00:00
core Merge "Add phony target to check all PCF ELF prebuilts" 2020-12-04 02:49:33 +00:00
packaging Fix creating _dist_<goal> targets under !dist 2018-10-21 08:56:27 -07:00
target Use sha256 to build the hashtree in avb image 2020-12-11 01:26:12 +00:00
tests Only set TARGET_PLATFORM version in lunch when explicitly requested 2017-05-01 14:26:40 -07:00
tools Use jni_libs instead of required for signapk conscrypt JNI 2020-12-02 11:37:21 -08:00
.gitignore Add build subprojects to .gitignore 2015-07-23 13:18:47 -07:00
Changes.md Require required modules to exist 2020-08-06 06:41:09 +00:00
CleanSpec.mk Add clean step to remove Soong's host copies of libconscrypt_openjdk_jni.so 2020-10-09 08:42:13 +00:00
Deprecation.md Obsolete unused module types 2020-04-18 21:00:18 -07:00
OWNERS Refactor OWNERS files in platform/build/make. 2020-10-08 16:14:44 -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 Export SOONG_HOST_OUT as ANDROID_SOONG_HOST_OUT 2020-11-03 11:06:39 +09:00
help.sh Revert "Add modules partition." 2020-09-15 19:09:26 +00:00
navbar.md Mark envsetup.sh vars as deprecated in makefiles 2017-11-28 14:19:50 -08:00
rbesetup.sh Switch default execution strategy to racing for developer builds 2020-11-25 12:14:16 -05:00
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.