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Update R8 configuration for deterministic and reproducible builds

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Resolves signalapp/Signal-Android#14899
This commit is contained in:
BarbossHack
2026-07-26 09:32:32 +00:00
committed by Alex Hart
parent fc25581a6f
commit f7c29ebcd7
1 changed files with 3 additions and 2 deletions
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gradle.properties
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@@ -1,11 +1,12 @@
# R8 in AGP 9.x is non-deterministic, producing intermittent dex differences between
# otherwise-identical builds. Two flags work together to stabilize it:
# - -Dcom.android.tools.r8.threadCount=1 removes thread-scheduling-dependent ordering.
# - -Dcom.android.tools.r8.deterministicdebugging=true run R8 compilation in a
# single thread and without randomly shuffling the input.
# - -XX:hashCode=3 (deterministic incrementing Object.identityHashCode) removes
# IdentityHashMap iteration-order non-determinism inside R8 (e.g. in
# KotlinClassMetadataReader, which decides whether to keep the Signature attribute
# on Kotlin generic lambda subclasses).
org.gradle.jvmargs=-Xmx12g -Xms256m -XX:MaxMetaspaceSize=1g -Dcom.android.tools.r8.threadCount=1 -XX:+UnlockExperimentalVMOptions -XX:hashCode=3
org.gradle.jvmargs=-Xmx12g -Xms256m -XX:MaxMetaspaceSize=1g -Dcom.android.tools.r8.deterministicdebugging=true -XX:+UnlockExperimentalVMOptions -XX:hashCode=3
# Without this, the Kotlin compile daemon inherits -Xmx12g from org.gradle.jvmargs.
kotlin.daemon.jvmargs=-Xmx4g -XX:MaxMetaspaceSize=512m