Linker warnings: liblivekit_uniffi.a was built for newer iOS version (26.1)

[bguidolim]

Description

After updating to the latest version of the SDK, Xcode produces numerous linker warnings during the build process. The warnings indicate that object files in liblivekit_uniffi.a were built for iOS 26.1, but the project is targeting a lower iOS version.

This appears to be related to PR #822 (Integrate UniFFI). The framework that needs to be rebuilt with a lower deployment target is: https://github.com/livekit/livekit-uniffi-xcframework

Environment

• Xcode: 26.1.1
• Project deployment target: iOS 16.0
• LiveKit SDK version: 2.11.0

Warnings

ld: object file ([PROJECT_PATH]/DerivedData/Build/Intermediates.noindex/ArchiveIntermediates/[SCHEME]/BuildProductsPath/Release-iphoneos/liblivekit_uniffi.a[558](25ac62e5b3c53843-curve25519.o)) was built for newer 'iOS' version (26.1) than being linked (16.0)
ld: object file ([PROJECT_PATH]/DerivedData/Build/Intermediates.noindex/ArchiveIntermediates/[SCHEME]/BuildProductsPath/Release-iphoneos/liblivekit_uniffi.a[559](0bbbd18bda93c05b-aes_nohw.o)) was built for newer 'iOS' version (26.1) than being linked (16.0)
ld: object file ([PROJECT_PATH]/DerivedData/Build/Intermediates.noindex/ArchiveIntermediates/[SCHEME]/BuildProductsPath/Release-iphoneos/liblivekit_uniffi.a[560](00c879ee3285a50d-montgomery.o)) was built for newer 'iOS' version (26.1) than being linked (16.0)
ld: object file ([PROJECT_PATH]/DerivedData/Build/Intermediates.noindex/ArchiveIntermediates/[SCHEME]/BuildProductsPath/Release-iphoneos/liblivekit_uniffi.a[561](00c879ee3285a50d-montgomery_inv.o)) was built for newer 'iOS' version (26.1) than being linked (16.0)
ld: object file ([PROJECT_PATH]/DerivedData/Build/Intermediates.noindex/ArchiveIntermediates/[SCHEME]/BuildProductsPath/Release-iphoneos/liblivekit_uniffi.a[562](a0330e891e733f4e-ecp_nistz.o)) was built for newer 'iOS' version (26.1) than being linked (16.0)
ld: object file ([PROJECT_PATH]/DerivedData/Build/Intermediates.noindex/ArchiveIntermediates/[SCHEME]/BuildProductsPath/Release-iphoneos/liblivekit_uniffi.a[564](a0330e891e733f4e-gfp_p384.o)) was built for newer 'iOS' version (26.1) than being linked (16.0)
ld: object file ([PROJECT_PATH]/DerivedData/Build/Intermediates.noindex/ArchiveIntermediates/[SCHEME]/BuildProductsPath/Release-iphoneos/liblivekit_uniffi.a[566](aaa1ba3e455ee2e1-limbs.o)) was built for newer 'iOS' version (26.1) than being linked (16.0)
ld: object file ([PROJECT_PATH]/DerivedData/Build/Intermediates.noindex/ArchiveIntermediates/[SCHEME]/BuildProductsPath/Release-iphoneos/liblivekit_uniffi.a[567](a4019cc0736b0423-mem.o)) was built for newer 'iOS' version (26.1) than being linked (16.0)
ld: object file ([PROJECT_PATH]/DerivedData/Build/Intermediates.noindex/ArchiveIntermediates/[SCHEME]/BuildProductsPath/Release-iphoneos/liblivekit_uniffi.a[568](d5a9841f3dc6e253-poly1305.o)) was built for newer 'iOS' version (26.1) than being linked (16.0)
ld: object file ([PROJECT_PATH]/DerivedData/Build/Intermediates.noindex/ArchiveIntermediates/[SCHEME]/BuildProductsPath/Release-iphoneos/liblivekit_uniffi.a[569](a0330e891e733f4e-p256-nistz.o)) was built for newer 'iOS' version (26.1) than being linked (16.0)
ld: object file ([PROJECT_PATH]/DerivedData/Build/Intermediates.noindex/ArchiveIntermediates/[SCHEME]/BuildProductsPath/Release-iphoneos/liblivekit_uniffi.a[570](c322a0bcc369f531-chacha-armv8-ios64.o)) was built for newer 'iOS' version (26.1) than being linked (16.0)
ld: object file ([PROJECT_PATH]/DerivedData/Build/Intermediates.noindex/ArchiveIntermediates/[SCHEME]/BuildProductsPath/Release-iphoneos/liblivekit_uniffi.a[571](c322a0bcc369f531-chacha20_poly1305_armv8-ios64.o)) was built for newer 'iOS' version (26.1) than being linked (16.0)
ld: object file ([PROJECT_PATH]/DerivedData/Build/Intermediates.noindex/ArchiveIntermediates/[SCHEME]/BuildProductsPath/Release-iphoneos/liblivekit_uniffi.a[572](c322a0bcc369f531-aesv8-armx-ios64.o)) was built for newer 'iOS' version (26.1) than being linked (16.0)
ld: object file ([PROJECT_PATH]/DerivedData/Build/Intermediates.noindex/ArchiveIntermediates/[SCHEME]/BuildProductsPath/Release-iphoneos/liblivekit_uniffi.a[573](c322a0bcc369f531-aesv8-gcm-armv8-ios64.o)) was built for newer 'iOS' version (26.1) than being linked (16.0)
ld: object file ([PROJECT_PATH]/DerivedData/Build/Intermediates.noindex/ArchiveIntermediates/[SCHEME]/BuildProductsPath/Release-iphoneos/liblivekit_uniffi.a[574](c322a0bcc369f531-ghash-neon-armv8-ios64.o)) was built for newer 'iOS' version (26.1) than being linked (16.0)
ld: object file ([PROJECT_PATH]/DerivedData/Build/Intermediates.noindex/ArchiveIntermediates/[SCHEME]/BuildProductsPath/Release-iphoneos/liblivekit_uniffi.a[575](c322a0bcc369f531-ghashv8-armx-ios64.o)) was built for newer 'iOS' version (26.1) than being linked (16.0)
ld: object file ([PROJECT_PATH]/DerivedData/Build/Intermediates.noindex/ArchiveIntermediates/[SCHEME]/BuildProductsPath/Release-iphoneos/liblivekit_uniffi.a[576](c322a0bcc369f531-vpaes-armv8-ios64.o)) was built for newer 'iOS' version (26.1) than being linked (16.0)
ld: object file ([PROJECT_PATH]/DerivedData/Build/Intermediates.noindex/ArchiveIntermediates/[SCHEME]/BuildProductsPath/Release-iphoneos/liblivekit_uniffi.a[577](c322a0bcc369f531-armv8-mont-ios64.o)) was built for newer 'iOS' version (26.1) than being linked (16.0)
ld: object file ([PROJECT_PATH]/DerivedData/Build/Intermediates.noindex/ArchiveIntermediates/[SCHEME]/BuildProductsPath/Release-iphoneos/liblivekit_uniffi.a[578](c322a0bcc369f531-p256-armv8-asm-ios64.o)) was built for newer 'iOS' version (26.1) than being linked (16.0)
ld: object file ([PROJECT_PATH]/DerivedData/Build/Intermediates.noindex/ArchiveIntermediates/[SCHEME]/BuildProductsPath/Release-iphoneos/liblivekit_uniffi.a[579](c322a0bcc369f531-sha512-armv8-ios64.o)) was built for newer 'iOS' version (26.1) than being linked (16.0)
ld: object file ([PROJECT_PATH]/DerivedData/Build/Intermediates.noindex/ArchiveIntermediates/[SCHEME]/BuildProductsPath/Release-iphoneos/liblivekit_uniffi.a[580](c322a0bcc369f531-sha256-armv8-ios64.o)) was built for newer 'iOS' version (26.1) than being linked (16.0)

Expected Behavior

No linker warnings should appear when integrating the SDK into projects with deployment targets lower than iOS 26.1.

Suggested Fix

Rebuild livekit-uniffi-xcframework (https://github.com/livekit/livekit-uniffi-xcframework) with a lower iOS deployment target (e.g., iOS 13.0 or matching the SDK's minimum deployment target) to ensure compatibility with projects targeting older iOS versions.

[pblazej]

@bguidolim feel free to check out the above branch ⤴️ that should resolve it

[bguidolim]

Hey @pblazej

Thanks for the quick fix.
I confirm the warnings are gone :)

I also had a issue when using the the latest build that were making my Xcode Previews crash, but if it happens again with the fix I'll create another issue.

[pblazej]

Thanks for the confirmation, our FFI support is still experimental - the same thing can be said about Xcode previews themselves 🥲

[bguidolim]

Got it!
Wouldn't be better then release new versions as pre-release?

[pblazej]

There's nothing really touching core functionality here, and it would be opt-in in SPM (no adoption). You can expect some next bigger features to leverage that more heavily.