Reland: Require TARGET_RELEASE for builds

Relanding because we've fixed a number of the broken build
setups this change exposed.  We will push to fix forward broken
build setups instead of reverting this change again.


Rather than use an unsupported flag setting that the user likely
doesn't even realize is being used, we immediately stop the build.

This error message is more verbose, mentioning 'lunch', because
it's anticipated a lot more users will hit this issue when first
switching to trunk stable, and more details will hopefully help
them out.

We have some complication in that some internal commands set
TARGET_RELEASE to an empty string.  We put in logic to allow
that path.

Since $(error) immediately stops the build, we also get rid of
some 'else' logic and indentation, to hopefully offset some of
the complication we've added.

Bug: 307946156
Change-Id: I0fa4a1c876e607401f4c7f945b9971cfb8db71a0
Test: 'lunch' (still) works; A build attempt without `TARGET_RELEASE` set (now) fails
1 file changed
tree: e20995685ee9a91e4d0366aea75eef2a2f11c873
  1. common/
  2. core/
  3. packaging/
  4. target/
  5. tests/
  6. tools/
  7. .gitignore
  8. banchanHelp.sh
  9. buildspec.mk.default
  10. Changes.md
  11. CleanSpec.mk
  12. cogsetup.sh
  13. Deprecation.md
  14. envsetup.sh
  15. help.sh
  16. METADATA
  17. navbar.md
  18. OWNERS
  19. PREUPLOAD.cfg
  20. rbesetup.sh
  21. README.md
  22. shell_utils.sh
  23. tapasHelp.sh
  24. 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For an outdated reference on Android.mk files, see build-system.html.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.