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platform_build/Deprecation.md
Dan Willemsen 695849ec88 Add infrastructure for deprecating module types 
Also start the deprecation for BUILD_HOST_TEST_CONFIG and
BUILD_TARGET_TEST_CONFIG, which have no users.

Bug: 130720555
Bug: 130723115
Bug: 130734993
Test: treehugger
Test: Add entries to DEFAULT_ERROR / OBSOLETE to manually test behavior
Change-Id: Icfdff43a29b6512494d44b9be11d178333505010
2019-04-17 17:02:20 -07:00

2.7 KiB
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Deprecation of Make

We've made significant progress converting AOSP from Make to Soong (Android.mk to Android.bp), and we're ready to start turning off pieces of Make. If you have any problems converting, please contact us via:

Status

build/make/core/deprecation.mk is the source of truth, but for easy browsing:

Module type State
BUILD_HOST_TEST_CONFIG Warning
BUILD_TARGET_TEST_CONFIG Warning
BUILD_* Available

Module Type Deprecation Process

We'll be turning off BUILD_* module types as all of the users are removed from AOSP (and Google's internal trees). The process will go something like this, using BUILD_PACKAGE as an example:

  • Prerequisite: all common users of BUILD_PACKAGE have been removed (some device-specific ones may remain).
  • BUILD_PACKAGE will be moved from AVAILABLE_BUILD_MODULE_TYPES to DEFAULT_WARNING_BUILD_MODULE_TYPES in build/make/core/deprecation.mk. This will make referring to BUILD_PACKAGE a warning.
  • Any devices that still have warnings will have BUILD_BROKEN_USES_BUILD_PACKAGE := true added to their BoardConfig.mk.
  • BUILD_PACKAGE will be switched from DEFAULT_WARNING_BUILD_MODULE_TYPES to DEFAULT_ERROR_BUILD_MODULE_TYPES, which will turn referring to BUILD_PACKAGE into an error unless the device has overridden it.
  • At some later point, after all devices in AOSP no longer set BUILD_BROKEN_USES_BUILD_PACKAGE, BUILD_PACKAGE will be moved from DEFAULT_ERROR_BUILD_MODULE_TYPES to OBSOLETE_BUILD_MODULE_TYPES and the code will be removed. It will no longer be possible to use BUILD_PACKAGE.

In most cases, we expect module types to stay in the default warning state for about two weeks before becoming an error by default. Then it will spend some amount of time in the default error state before moving to obsolete -- we'll try and keep that around for a while, but other development may cause those to break, and the fix may to be to obsolete them. There is no expectation that the BUILD_BROKEN_USES_BUILD_* workarounds will work in a future release, it's a short-term workaround.

Just to be clear, the above process will happen on the AOSP master branch. So if you're following Android releases, none of the deprecation steps will be in Android Q, and the 2020 release will have jumped directly to the end for many module types.