CODEWITHSUNDEEP
androidandroid-r8android-d8
Ismail H
Ismail H

Reputation: 4499

How Can I debug R8 during compilation?

Is there any way to debug R8 during compilation of an Android project ?

I have a really weird error and the casual fix won't help

Upvotes: 2

Views: 2838

Answers (2)

sgjesse
sgjesse

Reputation: 4628

Assuming that you have the R8 project checked out (from https://r8.googlesource.com/r8) and is using IntelliJ as the debugger, this is a way to debug Gradle building an Android Studio project.

First build r8:

tools/gradle.py r8

The r8.jar is built in build/libs and should then be referenced in the main build.gradle file (in the buildscript.repositories section) like this:

buildscript {

    dependencies {
        classpath files($PATH_TO_R8_JAR)  // Must be before the Gradle Plugin for Android.
        classpath 'com.android.tools.build:gradle:3.4.0-rc03'
     }
}

To debug a command line Gradle run pass the options -Dorg.gradle.debug=true and --no-daemon when invoking Gradle, E.g. for a release build of an Android Studio project:

./gradlew assembleRelease -Dorg.gradle.debug=true --no-daemon

The gradle command will wait for the debugger to attach. In IntelliJ create a standard remote debugging configuration and attach. The gradle command will continue and breakpoints in the R8 code will be hit.

NOTE: That for a range of the 3.5.0 aplha releases adding r8.jar to build.gradle can cause issues for Kotlin projects (see Issue 129240946).

Upvotes: 6

Martin Zeitler
Martin Zeitler

Reputation: 76769

For the R8 shrinker, can add the -verbose switch into the proguard.cfg file. there's an option:

--pg-conf proguard.cfg

It's build.gradle also shows, how default proguardArguments can be supplied.

Upvotes: 2

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