Non-reproducible build since a few weeks

[pstorch]

Hi,

I don't want to bother you with the issues of my app, but I ran out of ideas. Maybe someone has an idea or can point me in the right direction.

My android app https://codeberg.org/OpenTracksApp/OSMDashboard uses the VTM library to render a map with trackpoints. This app is published also on F-Droid. Since November 2024 it's a reproducible build. It worked fine over a year.
Then suddenly the reproducible build broke and I don't know why. I tried different jdk versions, different gradle versions and various settings to no success.

There are always one or two of the following classes which get compiled differently in the apk classes2.dex file:

• https://github.com/mapsforge/vtm/blob/master/vtm/src/org/oscim/layers/tile/buildings/S3DBUtils.java
• https://github.com/mapsforge/vtm/blob/master/vtm/src/org/oscim/layers/tile/buildings/S3DBLayer.java

Has anyone any idea what makes those two classes special or what I can do to fix the reproducible build?

[devemux86]

Probably need to check your Gradle / Java / ProGuard settings for any recent version changes.

"vtm-android-example" builds successfully. Compare your settings with this one.

Cruiser also, which uses VTM is always built successfully.

[pstorch]

Probably need to check your Gradle / Java / ProGuard settings for any recent version changes.

That's what I'm doing for the last weeks.

The app is building successfully and running just fine. But it can't be build reproducible on different systems. There are always some differences in the APK / classes2.dex file for these two VTM classes.
I was just hoping someone might now something.

Never mind. Feel free to mark it as answered.

[moving-bits]

Maybe you need to add some proguard rules to let the optimizer keep its fingers from some of the classes?

[pstorch]

I tried to fix it with proguard and other ways without success.
I finally removed the usage of the BuildingLayer from my app and repackaged the vtm dependency to remove the whole buildings package: https://codeberg.org/OpenTracksApp/OSMDashboard/src/branch/main/build.gradle.kts#L182

If someone is interested in the whole drama:

• https://codeberg.org/OpenTracksApp/OSMDashboard/src/branch/main/build.gradle.kts#L182
• https://gitlab.com/IzzyOnDroid/repo/-/issues/979