fix: link libm in Android shim build to resolve missing math symbols #54
Merged
SineVector241 merged 1 commit intoAvionBlock:masterfrom Apr 11, 2026
Merged
fix: link libm in Android shim build to resolve missing math symbols #54SineVector241 merged 1 commit intoAvionBlock:masterfrom
SineVector241 merged 1 commit intoAvionBlock:masterfrom
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The Android libopus.so was produced without -lm, so math functions used by CELT/SILK (sqrt, log, exp, etc.) ended up as unresolved symbols. On Android, libm is a separate shared object and bionic reports the resulting load failure as a generic 'library not found' error, which manifested in Unity IL2CPP as DllNotFoundException when initializing OpusEncoder/OpusDecoder on arm64 devices (e.g. Pixel 8 Pro). Add -lm to the Android shim link step (matching the Linux step) and -Wl,--no-undefined so any future missing dependency fails the build instead of silently producing a broken .so.
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Summary
The Android
libopus.sois currently produced without-lm, so math functions used by CELT/SILK (sqrt,log,exp, etc.) end up as unresolved symbols. On Android,libmis a separate shared object, and bionic reports the resulting load failure as a genericlibrary "opus" not founderror.In Unity IL2CPP this manifests as a
DllNotFoundExceptionthe momentOpusEncoder/OpusDecoderis constructed on arm64 devices — reproduced on a Pixel 8 Pro, but itaffects all Android arches produced by this workflow. The file is present in the APK and in the device's
nativeLibraryDir, the ELF is arm64 and 16 KB-page aligned,SONAME is clean — but
readelf -dshows onlyDT_NEEDED: libdl.so, libc.sowith nolibm.so, which is the smoking gun.The Linux shim step already passes
-lm; the Android step was simply missing it.Changes
-lmto the Android "Build with shim" link step, matching the Linux step.-Wl,--no-undefinedso any future missing dependency fails the GitHub Actions build loudly instead of silently producing a broken.sothat only fails atdlopentime on-device.