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Native linker warnings when building without Xcode classic linker #24045
Description
Apple platform
iOS
Framework version
net9.0-*
Affected platform version
net9.0-ios workload version 26.0.9752
Description
When building a project with the new Xcode linker (not the classic linker), there are some mixed ObjC warnings that occur during the LinkNativeCode phase.
Steps to Reproduce
dotnet new ios -o LinkerWarningsdotnet build LinkerWarnings.csproj -c Debug -f net9.0-ios -r iossimulator-arm64 --self-contained -v d
Note the following build warnings:
ld: warning: ignoring duplicate libraries: '-lSystem.Globalization.Native', '-lSystem.IO.Compression.Native', '-lSystem.Native', '-lSystem.Net.Security.Native', '-lSystem.Security.Cryptography.Native.Apple', '-lcompression', '-lmono-component-debugger', '-lmono-component-diagnostics_tracing', '-lmono-component-hot_reload', '-lmono-component-marshal-ilgen', '-lmonosgen-2.0', '-lxamarin-dotnet-debug'
ld: warning: mixed ObjC ABI, /usr/local/share/dotnet/packs/Microsoft.iOS.Runtime.iossimulator-arm64.net9.0_26.0/26.0.9752/runtimes/iossimulator-arm64/native/Microsoft.iOS.registrar.a compiled with category class properties
ld: warning: mixed ObjC ABI, /Users/todd.diehl/code/LinkerWarnings/LinkerWarnings/obj/Debug/net9.0-ios/iossimulator-arm64/nativelibraries/main.arm64.o compiled with category class properties
Minimal repro: https://github.com/tdiehl/LinkerWarning
Did you find any workaround?
Build with the classic linker by adding the following to the .csproj file.
<PropertyGroup>
<MtouchExtraArgs>$(MtouchExtraArgs) -gcc_flags "-Xlinker -ld_classic"</MtouchExtraArgs>
</PropertyGroup>
<ItemGroup>
<_MainLinkerFlags Include="-ld_classic" />
</ItemGroup>
Activity
rolfbjarne commentedon Oct 20, 2025
There's some information about this warning here: https://developer.apple.com/forums/thread/740231
We'll investigate and see what we can figure out.