JNI libraries missing in AAR file on first build

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#43 opened on Sep 17, 2020 7 comments 1 reaction 0 assignees View on GitHub

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Assessment

Difficulty: 4/5
Estimated time: 3-5 days
Newbie friendliness: 35/100

Issue type: Bug
Clarity: Mostly clear
Activity status: Stale
Tech stack: android, rust
Domain: build-system, mobile

Research direction

Start with the reproduction in samples/library, its build.gradle configuration, and the assembleDebug task. Build once from a clean state, inspect build/outputs/aar/library-debug.aar, then build again for comparison. Done means the first assembleDebug build includes the JNI libraries in the AAR.

Written by the indexing model from the issue text.

Description

When I build my library project for the first time after cleaning the build, build/outputs/aar/library-debug.aar does not contain the JNI libraries. Only when building for a second time, the JNI libraries are included.

This can be reproduced with samples/library of this repo:

Checkout the repo

git clone git@github.com:mozilla/rust-android-gradle.git
cd rust-android-gradle/

Copy the gradle wrapper into samples/library

cd samples/library
cp ../../gradlew .
cp -Ra ../../gradle .

Update the gradle wrapper to the latest version

export ANDROID_HOME=~/Library/Android/sdk/
./gradlew wrapper --gradle-version 6.6.1

Make the project use the rust plugin from the repository instead of the locally build one
```
rm settings.gradle
touch settings.gradle
```
In build.gradle, change the rust plugin classpath to gradle.plugin.org.mozilla.rust-android-gradle:plugin:0.8.3
Update the Android gradle plugin to 4.0.1 in build.gradle
Build the library
```
./gradlew assembleDebug
```
Look at build/outputs/aar/library-debug.aar and notice the JNI libraries are not included.
Build the library again by again invoking ./gradlew assembleDebug. Now build/outputs/aar/library-debug.aar will contain the JNI libraries.

Is there a workaround for this that I could apply to build.gradle?

Dominant language: Kotlin
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