bbe4e11a76
When an Android.mk specifies a local path that is outside the current
directory, it uses '..', since we prepend $(LOCAL_PATH)/ to the given
path.
This path ('a/b/../c') gets inserted into command lines and
dependencies. For dependencies, when it gets to Ninja, Ninja calls
CanonicalizePath and removes those references ('a/c'), but the command
line is preserved.
So we've got a command line that references 'a/b', but no dependency on
it. Usually that's not a big problem, but it's an issue if we're trying
to only expose dependencies to the rule, like with RBE only sending the
dependencies to the remote workers. So use our 'clean-path' macro to
collapse the '..' references in Kati so that they don't show up in the
command line either.
Test: treehugger
Test: build a system image with RBE
Change-Id: I0706faa2ac15e9c12c720f43c7bb8171c5efd97c
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For an outdated reference on Android.mk files, see build-system.html.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.