The answer differs depending on which platform version you are building and what you are changing in the incremental build.
In M, builds are done entirely using make. All incremental builds take 1-2 minutes just to parse the makefiles. In N we introduced Kati, which is a precursor of the Soong project. Kati converts makefiles to a build.ninja files, and only needs to regenerate the build.ninja file if a change has been made that affects reading the makefiles (primarily editing a makefile, but also anything that changes the results of a $(wildcard) or $(shell) command in a makefile). This cuts incremental build times with no changes down to ~10 seconds, but some changes will still require the full 1-2 minutes to reread all the makefiles. Clean build time should not be significantly affected, it is dominated by running all the compile commands. N also has a preview of Soong, which can be enabled with make USE_SOONG=true. This will use Soong Android.bp files for a few projects where they exist (primarily bionic/ and its dependencies), ignoring the Android.mk files there. Again, clean build time will not be affected, but many modifications to the Android.bp file will only take ~5 seconds to regenerate the manifest instead of 1-2 minutes for an Android.mk file. Some information like the list of module names and their installation dependencies still need to be exported to make, so some changes to an Android.bp file may trigger rereading makefiles and take 1-2 minutes. In AOSP master, Soong is always enabled, and many projects only have Android.bp files now. Incremental build performance is similar to N with USE_SOONG=true. The targets for Soong is to have an incremental build with no changes be under 5 seconds, and the time to start running build commands to be under 10 seconds for all incremental builds. On Mon, Nov 21, 2016 at 11:48 AM, Anuj Goyal <[email protected]> wrote: > Does anyone have any comparison data on Soong biuld times vs. Make build > times? > > 1. Initial build > 2. Incremental builds > > https://android.googlesource.com/platform/build/soong/ > > -Anuj > > -- > -- > You received this message because you are subscribed to the "Android > Building" mailing list. > To post to this group, send email to [email protected] > To unsubscribe from this group, send email to > [email protected] > For more options, visit this group at > http://groups.google.com/group/android-building?hl=en > > --- > You received this message because you are subscribed to the Google Groups > "Android Building" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/d/optout. -- -- You received this message because you are subscribed to the "Android Building" mailing list. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-building?hl=en --- You received this message because you are subscribed to the Google Groups "Android Building" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
