Building Time!

1. Run

. build/envsetup.sh

or

source build/envsetup.sh

2. Run lunch PRODUCT-RELEASE(IF A14 QPR2+)-VARIANT. This is the device and variant you want to build for. (eg `lunch lineage_bacon-userdebug or lunch lineage_oxygen-ap2a-userdebug)

However, it is easier to use breakfast instead, like breakfast PRODUCT VARIANT (eg. breakfast oxygen userdebug)

• Product: Many roms have their own prefixes. Lineage and most lineage-based forks use lineage_device, LMOdroid uses lmo_device and other AOSP based forks use aosp_device.

• Release: Starting with A14 QPR2, you must include the release field. On A14 QPR2, this will look something like ap1a. On android main branch, this is trunk_staging. You can find out the release that the source ships by running:

  find $(gettop)/build/release/aconfig/* -maxdepth 0 -type d -name "[a-z][a-z][0-9][a-z]" -printf '%f\n' | tail -n1

• Variant: Variant is the type of build you want to build.

  • eng offers easy debugging, but runs slow on the device and is insecure. This should ideally only be used for tree developement or booting a new android version for the first time on a device.
  • userdebug is a hybrid between eng and user. This offers easier debugging than user, like adb root(if enabled through settings) and runs faster on the device. This builds slower. Most people ship custom roms as this variant.
  • user is the least debuggable variant. Most OEMs ship their stock rom in this variant. Here debuggability is minimal.

3. Run

m -j$(nproc --all)

• Note #1: If you get errors regarding memory, try reducing the -j argument. The j (jobs) argument is the number of threads which are used during compilation.

• Note #2: If you want a flashable zip instead of raw images, run (for most roms)

m bacon -j$(nproc --all)

Hopefully, android builds without errors. This guide does not cover fixing common errors. Once done, you should hopefully see build completed.