Android 16 KB page-size incompatibility: librive_text.so built with 4 KB LOAD section alignment #527
Description
On Android builds using NDK r27+, the prebuilt librive_text.so shipped with the rive Flutter package is not aligned for 16 KB page sizes. APK Analyzer reports: “4 KB LOAD section alignment, but 16 KB is required.” This prevents full compatibility with devices that require 16 KB pages.
Environment
Flutter: stable (≥ 3.22)
rive (Flutter): 0.13.20
Android Gradle Plugin: recent (compatible with compileSdk 36)
compileSdk: 36
targetSdk: 35
minSdk: 28
NDK: r27 27.0.12077973
ABIs tested: armeabi-v7a, arm64-v8a, x86, x86_64
Evidence
APK Analyzer → lib//librive_text.so: “4 KB LOAD section alignment, but 16 KB is required”
Other native libs (e.g., libflutter.so) are 16 KB–aligned on the same build.
Reproduction steps
Use rive: ^0.13.20 in pubspec.yaml.
Build Android release with NDK r27+:
flutter clean
flutter build apk --release
Open the APK in Android Studio’s APK Analyzer.
Navigate to lib//librive_text.so → observe 4 KB LOAD section alignment.
Build configuration (for reference)
android {
compileSdk = 36
ndkVersion = "27.0.12077973"
defaultConfig {
targetSdk = 35
// Also tried passing flexible page size flags to native builds:
externalNativeBuild {
ndkBuild {
arguments "APP_LDFLAGS+=-Wl,-z,max-page-size=16384"
}
// For CMake builds (not used here):
// cmake { arguments "-DANDROID_SUPPORT_FLEXIBLE_PAGE_SIZES=ON" }
}
}
}
Note: These flags only affect code compiled in the app; they cannot modify prebuilt third‑party .so files.
Expected behavior
librive_text.so should be built with 16 KB page-size support (flexible page sizes) so APK Analyzer shows 16 KB LOAD section alignment on all ABIs.
Actual behavior
librive_text.so shows 4 KB LOAD section alignment across ABIs (e.g., arm64-v8a, x86_64), triggering the Android Studio warning “16 KB is required.”
Impact
Potential incompatibility on devices/emulators that require 16 KB pages (Android 15+ guidance).
Blocks shipping without warnings and risks runtime failures on affected devices.
Workarounds tried
Upgraded to NDK r27 and passed -Wl,-z,max-page-size=16384 / -DANDROID_SUPPORT_FLEXIBLE_PAGE_SIZES=ON where applicable → no effect (prebuilt .so).
Considered removing Rive or replacing with Lottie/static assets as a temporary mitigation.
Request
Please publish rive Flutter artifacts where librive_text.so is built using NDK r27+ with flexible page-size support enabled, producing 16 KB–aligned LOAD sections across all supported ABIs. If a beta or nightly build already includes this, guidance on the version tag would be appreciated.
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