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

For documentation on how to run a build, seeUsage.txt

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

For an outdated reference on Android.mk files, seebuild-system.html.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

This Makefile-based system is in the process of being replaced withSoong, anew build system written in Go. During the transition, all of these makefilesare read byKati, and generate a ninja file instead of being executeddirectly. That's combined with a ninja file read by Soong so that the buildgraph of the two systems can be combined and run as one.