Roland Levillain 1dbb0c3d1e Introduce build variable OVERRIDE_TARGET_FLATTEN_APEX.
When `OVERRIDE_TARGET_FLATTEN_APEX` is defined (e.g. set in the
environment), `TARGET_FLATTEN_APEX` is forcibly assigned its value.

This is useful to enable/disable APEX flattening from the command
line (thus ignoring the product's default configuration), for testing
purposes.

Note: Previously it was possible to set `TARGET_FLATTEN_APEX` directly
and have the same effect, but recent changes in the build
configuration now prevent that option.

Test: Check that:
        export OVERRIDE_TARGET_FLATTEN_APEX=true \
          && . ./build/envsetup.sh \
          && lunch aosp_walleye-userdebug \
          && export OVERRIDE_TARGET_FLATTEN_APEX=true \
          && build/soong/soong_ui.bash --dumpvar-mode TARGET_FLATTEN_APEX
      returns:
        true
Bug: 121117762

Merged-In: Ib9ccae38430340de38e4758b4f55df2c65ea60d5
Change-Id: Ib9ccae38430340de38e4758b4f55df2c65ea60d5
(cherry picked from commit b3a503df7f)
2020-05-19 02:06:45 +00:00
2018-12-17 13:46:17 -08:00
2015-07-23 13:18:47 -07:00
2018-08-20 10:44:59 -07:00
2018-01-08 15:26:16 -08:00
2018-07-14 09:32:13 -07:00

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For an outdated reference on Android.mk files, see build-system.html.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.

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