Revise GSI targets to inherit from mainline_system directly

The patch seperates gsi_common.mk to aosp_product.mk and
gsi_release.mk. Let GSI targets can be inherit with 3 parts:

- system: mainline_system.mk
- product: aosp_product.mk
- vendor: none or emulator vendor makefiles

aosp_product.mk includes the AOSP packages/settings will be in
the product partition.

GSI targets also includes the gsi_release.mk, which contains
the special settings for the GSI for releasing, ex.
skip_mount.cfg, extra VNDK, etc. After the patch, the build
targets inherit from aosp_$arch.mk will not apply these special
settings anymore.

The gsi_common.mk, legacy_gsi_common.mk and aosp_$arch_ab.mk will
be phased out later.

Bug: 135502030
Test: build gsi_arm64-userdebug and aosp_arm64-userdebug, compare
Test: root, system and vendor in out folder with/without the patch
Change-Id: Ic604ac91ba9a704e6507bac324d19bbf68063464
7 files changed
tree: e1ffae2f7504ac316c8d446266da04cc5446b1b4
  1. common/
  2. core/
  3. packaging/
  4. target/
  5. tests/
  6. tools/
  7. .gitignore
  8. buildspec.mk.default
  9. Changes.md
  10. CleanSpec.mk
  11. Deprecation.md
  12. envsetup.sh
  13. help.sh
  14. navbar.md
  15. OWNERS
  16. README.md
  17. tapasHelp.sh
  18. Usage.txt
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For an outdated reference on Android.mk files, see build-system.html.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.