v7.2x increasing memory requirements to build

[tw-hx]

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• I have searched searched open and closed issues for duplicates
• I am submitting a bug report for existing functionality that does not work as intended
• This isn't a feature request or a discussion topic

Bug description

I've noticed recent rapidly escalating memory requirements to build Signal Android from source. I used to be able to build comfortably with 16Gb RAM, then with v7.25 it started hitting swap space hard, and v7.26 required 24Gb RAM/swap. I can just build it using a standard ubuntu-latest GitHub Actions runner with the addition of an 8Gb swapfile. The peak demand for RAM seems to be during R8 minifying. The resulting APK size has hardly changed.

On Signal's end it seems the JVM max heap size was increased from 6Gb to 12Gb three weeks ago as this became apparent. Sorry I haven't bisected the exact change responsible.

Would it be possible to look into what's bloating the build requirements? At least for reproducibility testing it might be ideal to target building well on a standard Github "ubuntu-latest" image?

Also, another recent upstream change I've noticed is the need for stripping the symbols from binaries of libsignal-android (v0.53.0 .. v0.54.0) and ringrtc-android (v2.48.0 .. v2.48.1), which used to be shipped as smaller stripped libraries. This means that unless the NDK is installed, the APK size is a lot bigger and not reproducible. In Signal-Android, these affected the v7.14 and v7.19 APK sizes.

Screenshots

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Device

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Android version

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Signal version

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Link to debug log

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