ci: strip debug symbols from Android prebuilt SDK libraries - #702
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The NDK toolchain injects -g into all build types. AGP normally strips the .so files at APK packaging time, but the prebuilt SDK ships them directly, so libzvec.so carried hundreds of MB of DWARF debug info (~500MB, 147MB compressed tar.gz). Add a strip step to the Android build job that runs llvm-strip (with a llvm-objcopy --strip-all fallback) over the staged libraries before packaging. Verified on the fork (v0.2.99-test2 build): libzvec.so ~500MB -> 29MB, zvec-sdk-android-arm64.tar.gz 153.8MB -> 24.3MB (-84%), other platform packages unchanged, and the staged SDK still passes the cross-compile link smoke test.
iqbalbhatti49
approved these changes
Aug 26, 2026
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Problem
The Android prebuilt SDK asset in release builds is abnormally large:
zvec-sdk-android-arm64.tar.gzis ~147 MB compressed and contains a ~500 MBlibzvec.so, while all other platform packages are 20-38 MB.Root cause
The NDK toolchain injects
-ginto all build types. In normal Android app builds AGP strips the.sofiles at APK packaging time, but_build_prebuilt.ymlships the raw.sofiles directly and has no strip step, so hundreds of MB of DWARF debug info end up inlibzvec.so.Fix
Add a strip step to the Android build job in
.github/workflows/_build_prebuilt.yml, running over the staged libraries before packaging:llvm-stripfrom$NDK/toolchains/llvm/prebuilt/linux-x86_64/binllvm-objcopy --strip-allifllvm-stripis unavailable, and prints the NDK tool layout to aid debugging if neither is foundVerification
Built from my fork with this change (release run for tag
v0.2.99-test2, since cleaned up):libzvec.so: ~500 MB -> 29 MBzvec-sdk-android-arm64.tar.gz: 153,829,823 B -> 24,304,754 B (-84%)