IssueTracker

I'm currently developing an Android App using Gradle & Android Studio.

I recently upgraded my project to

• Kotlin 2.0.20
• Android Studio Ladybug | 2024.2.1
• AGP 8.7.0
• gradle-wrapper 8.10.2

When running ./gradlew assembleMyAppRelease --rerun-tasks i get lots of warnings of the following format:

<SomeProguardFile><SomeLine>: R8: The current version of R8 implicitly keeps the default constructor for Proguard configuration rules that have no member pattern. If the following rule should continue to keep the default constructor in the next major version of R8, then it must be augmented with the member pattern `{ void <init>(); }` to explicitly keep the default constructor:
<SomeKeepRule>

This might be a totally valid warning (can't judge). However, this does occur for proguard-android-optimize.txt which is the reason i'm writing this ticket.

This warning also occurs for a few major dependencies' proguard files (e.g. navigation-common-2.8.2/proguard.txt, retrofit2.pro) but i guess that's the job of the dependencies' maintainers.

Might be related to: https://issuetracker.google.com/issues/225394515

Full warning text attached:

WARNING: MyApp/app/build/intermediates/default_proguard_files/global/proguard-android-optimize.txt-8.7.0:21:1-22:1: R8: The current version of R8 implicitly keeps the default constructor for Proguard configuration rules that have no member pattern. If the following rule should continue to keep the default constructor in the next major version of R8, then it must be augmented with the member pattern `{ void <init>(); }` to explicitly keep the default constructor:
-keep public class com.google.vending.licensing.ILicensingService
WARNING: MyApp/app/build/intermediates/default_proguard_files/global/proguard-android-optimize.txt-8.7.0:22:1-23:1: R8: The current version of R8 implicitly keeps the default constructor for Proguard configuration rules that have no member pattern. If the following rule should continue to keep the default constructor in the next major version of R8, then it must be augmented with the member pattern `{ void <init>(); }` to explicitly keep the default constructor:
-keep public class com.android.vending.licensing.ILicensingService
WARNING: MyApp/app/build/intermediates/default_proguard_files/global/proguard-android-optimize.txt-8.7.0:23:1-24:1: R8: The current version of R8 implicitly keeps the default constructor for Proguard configuration rules that have no member pattern. If the following rule should continue to keep the default constructor in the next major version of R8, then it must be augmented with the member pattern `{ void <init>(); }` to explicitly keep the default constructor:
-keep public class com.google.android.vending.licensing.ILicensingService
WARNING: MyApp/app/build/intermediates/default_proguard_files/global/proguard-android-optimize.txt-8.7.0:68:1-70:1: R8: The current version of R8 implicitly keeps the default constructor for Proguard configuration rules that have no member pattern. If the following rule should continue to keep the default constructor in the next major version of R8, then it must be augmented with the member pattern `{ void <init>(); }` to explicitly keep the default constructor:
-keep class android.support.annotation.Keep
WARNING: /Users/myuser/.gradle/caches/8.10.2/transforms/715333a1ecef770702b2a1f647f7f162/transformed/navigation-common-2.8.2/proguard.txt:28:1-29:1: R8: The current version of R8 implicitly keeps the default constructor for Proguard configuration rules that have no member pattern. If the following rule should continue to keep the default constructor in the next major version of R8, then it must be augmented with the member pattern `{ void <init>(); }` to explicitly keep the default constructor:
-keep,allowrepackaging,allowobfuscation,allowshrinking class * extends androidx.navigation.Navigator
WARNING: /Users/myuser/.gradle/caches/8.10.2/transforms/486a931bd4669238f14c1dba2cc2fbd6/transformed/camera-core-1.3.4/proguard.txt:17:1-18:1: R8: The current version of R8 implicitly keeps the default constructor for Proguard configuration rules that have no member pattern. If the following rule should continue to keep the default constructor in the next major version of R8, then it must be augmented with the member pattern `{ void <init>(); }` to explicitly keep the default constructor:
-keep,allowrepackaging,allowobfuscation,allowshrinking class ** implements androidx.camera.core.impl.Quirk
WARNING: /Users/myuser/.gradle/caches/8.10.2/transforms/594ac2a0c688667ed304f131ea6c3aba/transformed/ui-release/proguard.txt:33:1-34:1: R8: The current version of R8 implicitly keeps the default constructor for Proguard configuration rules that have no member pattern. If the following rule should continue to keep the default constructor in the next major version of R8, then it must be augmented with the member pattern `{ void <init>(); }` to explicitly keep the default constructor:
-keep,allowshrinking class * extends androidx.compose.ui.node.ModifierNodeElement
WARNING: /Users/myuser/.gradle/caches/8.10.2/transforms/65a1aee62ccb10e0d038bf77feb0aae6/transformed/rules/lib/META-INF/com.android.tools/r8/kotlinx-serialization-r8.pro:12:2-13:1: R8: The current version of R8 implicitly keeps the default constructor for Proguard configuration rules that have no member pattern. If the following rule should continue to keep the default constructor in the next major version of R8, then it must be augmented with the member pattern `{ void <init>(); }` to explicitly keep the default constructor:
-keep,allowaccessmodification,allowrepackaging,allowobfuscation,allowshrinking,allowoptimization class <1>
WARNING: /Users/myuser/.gradle/caches/8.10.2/transforms/0ebbc39c8aa28ad9492d8a72cae878e2/transformed/rules/lib/META-INF/proguard/retrofit2.pro:32:1-35:1: R8: The current version of R8 implicitly keeps the default constructor for Proguard configuration rules that have no member pattern. If the following rule should continue to keep the default constructor in the next major version of R8, then it must be augmented with the member pattern `{ void <init>(); }` to explicitly keep the default constructor:
-keep,allowrepackaging,allowobfuscation interface <1>
WARNING: /Users/myuser/.gradle/caches/8.10.2/transforms/0ebbc39c8aa28ad9492d8a72cae878e2/transformed/rules/lib/META-INF/proguard/retrofit2.pro:36:1-41:1: R8: The current version of R8 implicitly keeps the default constructor for Proguard configuration rules that have no member pattern. If the following rule should continue to keep the default constructor in the next major version of R8, then it must be augmented with the member pattern `{ void <init>(); }` to explicitly keep the default constructor:
-keep,allowrepackaging,allowobfuscation interface * extends <1>
WARNING: /Users/myuser/.gradle/caches/8.10.2/transforms/0ebbc39c8aa28ad9492d8a72cae878e2/transformed/rules/lib/META-INF/proguard/retrofit2.pro:41:1-44:1: R8: The current version of R8 implicitly keeps the default constructor for Proguard configuration rules that have no member pattern. If the following rule should continue to keep the default constructor in the next major version of R8, then it must be augmented with the member pattern `{ void <init>(); }` to explicitly keep the default constructor:
-keep,allowrepackaging,allowobfuscation,allowshrinking class kotlin.coroutines.Continuation
WARNING: /Users/myuser/.gradle/caches/8.10.2/transforms/0ebbc39c8aa28ad9492d8a72cae878e2/transformed/rules/lib/META-INF/proguard/retrofit2.pro:45:1-48:1: R8: The current version of R8 implicitly keeps the default constructor for Proguard configuration rules that have no member pattern. If the following rule should continue to keep the default constructor in the next major version of R8, then it must be augmented with the member pattern `{ void <init>(); }` to explicitly keep the default constructor:
-keep,allowrepackaging,allowobfuscation,allowshrinking,allowoptimization class <3>
WARNING: /Users/myuser/.gradle/caches/8.10.2/transforms/0ebbc39c8aa28ad9492d8a72cae878e2/transformed/rules/lib/META-INF/proguard/retrofit2.pro:48:1-49:1: R8: The current version of R8 implicitly keeps the default constructor for Proguard configuration rules that have no member pattern. If the following rule should continue to keep the default constructor in the next major version of R8, then it must be augmented with the member pattern `{ void <init>(); }` to explicitly keep the default constructor:
-keep,allowrepackaging,allowobfuscation,allowshrinking class retrofit2.Response
WARNING: /Users/myuser/.gradle/caches/8.10.2/transforms/425fe8614d1c2f63eff8a1e7b110b248/transformed/rules/lib/META-INF/proguard/okhttp3.pro:5:1-8:1: R8: The current version of R8 implicitly keeps the default constructor for Proguard configuration rules that have no member pattern. If the following rule should continue to keep the default constructor in the next major version of R8, then it must be augmented with the member pattern `{ void <init>(); }` to explicitly keep the default constructor:
-keep,allowshrinking class okhttp3.internal.publicsuffix.PublicSuffixDatabase
WARNING: /Users/myuser/.gradle/caches/8.10.2/transforms/3ce222171d2dfbad834a71fbe2fa401e/transformed/startup-runtime-1.1.1/proguard.txt:2:1-7:1: R8: The current version of R8 implicitly keeps the default constructor for Proguard configuration rules that have no member pattern. If the following rule should continue to keep the default constructor in the next major version of R8, then it must be augmented with the member pattern `{ void <init>(); }` to explicitly keep the default constructor:
-keep,allowshrinking class * extends androidx.startup.Initializer
WARNING: /Users/myuser/.gradle/caches/8.10.2/transforms/d5bce1f35c6fd6f53c4c47e33faf201e/transformed/versionedparcelable-1.1.1/proguard.txt:1:1-2:1: R8: The current version of R8 implicitly keeps the default constructor for Proguard configuration rules that have no member pattern. If the following rule should continue to keep the default constructor in the next major version of R8, then it must be augmented with the member pattern `{ void <init>(); }` to explicitly keep the default constructor:
-keep class * implements androidx.versionedparcelable.VersionedParcelable
WARNING: /Users/myuser/.gradle/caches/8.10.2/transforms/d5bce1f35c6fd6f53c4c47e33faf201e/transformed/versionedparcelable-1.1.1/proguard.txt:4:1-5:1: R8: The current version of R8 implicitly keeps the default constructor for Proguard configuration rules that have no member pattern. If the following rule should continue to keep the default constructor in the next major version of R8, then it must be augmented with the member pattern `{ void <init>(); }` to explicitly keep the default constructor:
-keep public class androidx.versionedparcelable.ParcelImpl
WARNING: /Users/myuser/.gradle/caches/8.10.2/transforms/6241ae5040d44eb8e5e890ab8f1c4e14/transformed/rules/lib/META-INF/proguard/androidx-annotations.pro:1:1-2:1: R8: The current version of R8 implicitly keeps the default constructor for Proguard configuration rules that have no member pattern. If the following rule should continue to keep the default constructor in the next major version of R8, then it must be augmented with the member pattern `{ void <init>(); }` to explicitly keep the default constructor:
-keep,allowrepackaging,allowobfuscation @interface androidx.annotation.Keep