Random '_ComputeManagedAssemblyToLink' errors when building for Mac Catalyst

[projectgoav]

Apple platform

Mac Catalyst

Framework version

net8.0-* [unsupported, please update to .NET 9+]

Affected platform version

8.0.411

Description

I am attempting to get a MacCatalyst build of our native library for use with a .NET application. I am able to build and link most of the time but I often get a failure:
error MSB4057: The target "_ComputeManagedAssemblyToLink" does not exist in the project.

This happens about 20% of the time when running locally on a MacBook Pro M1 / Sequoia 15.5 and about 75% of the time when running on a MacMini M4 / Max OSX unknown at present.

Building the library we have works 100% of the time. This only occurs when I attempt to build some of our test projects.

Csproj has: <TargetFrameworks>net8.0;net8.0-ios;net8.0-maccatalyst</TargetFrameworks>

Build command is:
dotnet publish <csproj> --framework=net8.0-maccatalyst --runtime=maccatalyst-arm64 --self-contained /p:PublishSingleFile:false /p:Configuration=<configuration> --output <path> -bl

I've captured a binlog (attached) if that helps.

Steps to Reproduce

1. Build our project
2. Randomly the build will fail

Project is open source here: https://github.com/openhome/ohnet

Once cloned....

MacCatalyst-arm64
Build everything + package: PLATFORM=Mac-arm64-maccatalyst python hudson_build.py
Build everything: make [debug=1] Maccatalyst-arm64=1

Mac-arm64
Build everything + run tests + package: PLATFORM=Mac-arm64 python hudson_build.py
Build everything: make [debug=1] Mac-arm64=1

Did you find any workaround?

No response

Build logs

msbuild.zip

[projectgoav]

Forgot to add - when building the test projects, it appeared that dotnet required us to provide the link arguments like we do for our native iOS application. However, the iOS build of this library did not require them.

So: dotnet publish <csproj> --framework=net8.0-ios--runtime=ios-arm64 --self-contained /p:PublishSingleFile:true /p:Configuration=<configuration> --output <path> -bl succeeds 100% of the time.

but when building for maccatalyst I required to provide some linker arguments. These are provided in a Directory.Build.props file. This is an adaption on the commands we use to build our final iOS application.

[projectgoav]

<?xml version="1.0" encoding="utf-8"?>
<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003"> 
  <PropertyGroup Condition=" '$(RuntimeIdentifier)' == 'maccatalyst-arm64' ">
    <ohnetDir>$(MSBuildThisFileDirectory)../../../../Build/Obj/Mac-arm64/$(Configuration)/</ohnetDir>
    <ohNetGccFlags>-L$(ohnetDir) -lohNetCore -force_load $(ohnetDir)libohNet.dylib</ohNetGccFlags>
    <ohNetArgs>-cxx -gcc_flags "$(ohNetGccFlags)"</ohNetArgs>
  </PropertyGroup>
  <!-- 
  If MtouchExtraArgs is set, we don't know if the gcc flags have already been specified.
  So, only set it if it is not already set. Any project that includes ohNet that sets MtouchEventArgs
  will need to include $(ohNetGccFlags) in the gcc flags.
  -->
  <PropertyGroup Condition=" '$(RuntimeIdentifier)' == 'maccatalyst-arm64' And '$(MtouchExtraArgs)' == '' ">
    <MtouchLink>SdkOnly</MtouchLink>
    <MtouchUseLlvm>true</MtouchUseLlvm>
    <MtouchFloat32>true</MtouchFloat32>
    <MtouchExtraArgs>$(ohNetArgs)</MtouchExtraArgs>
  </PropertyGroup>
</Project>

[rolfbjarne]

I think this is caused by having multiple project files in the same directory:

• https://github.com/openhome/ohNet/tree/master/OpenHome/Net/Bindings/Cs

They end up sharing the bin/obj directories, and overwriting eachother's temporary build files, causing problems such as these.

Can you try moving each project file to a separate directory and see if that helps?

[projectgoav]

What's specific about the MacCatalyst build that requires the csproj to be in their own directory? Mac and iOS builds don't appear to need it.

[rolfbjarne]

What's specific about the MacCatalyst build that requires the csproj to be in their own directory? Mac and iOS builds don't appear to need it.

There's nothing specific about Mac Catalyst that requires this, the fact that it works on macOS/iOS builds is probably just plain luck.

[projectgoav]

Moving the csprojs into their own directories fails in a totally differnet way (on Mac, iOS & MacCatalyst builds) but still just as randomly.

/Users/hudson/workspace/ohNet/PLATFORM/Mac-arm64-maccatalyst/OpenHome/Net/Bindings/Cs/obj/Debug/net8.0-maccatalyst/.NETCoreApp,Version=v8.0.AssemblyAttributes.cs(4,12): error CS0579: Duplicate 'global::System.Runtime.Versioning.TargetFrameworkAttribute' attribute [/Users/hudson/workspace/ohNet/PLATFORM/Mac-arm64-maccatalyst/OpenHome/Net/Bindings/Cs/ohNet.net.csproj::TargetFramework=net8.0-maccatalyst]
/Users/hudson/workspace/ohNet/PLATFORM/Mac-arm64-maccatalyst/OpenHome/Net/Bindings/Cs/obj/Debug/net8.0-maccatalyst/ohNet.net.AssemblyInfo.cs(13,12): error CS0579: Duplicate 'System.Reflection.AssemblyCompanyAttribute' attribute [/Users/hudson/workspace/ohNet/PLATFORM/Mac-arm64-maccatalyst/OpenHome/Net/Bindings/Cs/ohNet.net.csproj::TargetFramework=net8.0-maccatalyst]
/Users/hudson/workspace/ohNet/PLATFORM/Mac-arm64-maccatalyst/OpenHome/Net/Bindings/Cs/obj/Debug/net8.0-maccatalyst/ohNet.net.AssemblyInfo.cs(14,12): error CS0579: Duplicate 'System.Reflection.AssemblyConfigurationAttribute' attribute [/Users/hudson/workspace/ohNet/PLATFORM/Mac-arm64-maccatalyst/OpenHome/Net/Bindings/Cs/ohNet.net.csproj::TargetFramework=net8.0-maccatalyst]
/Users/hudson/workspace/ohNet/PLATFORM/Mac-arm64-maccatalyst/OpenHome/Net/Bindings/Cs/obj/Debug/net8.0-maccatalyst/ohNet.net.AssemblyInfo.cs(15,12): error CS0579: Duplicate 'System.Reflection.AssemblyFileVersionAttribute' attribute [/Users/hudson/workspace/ohNet/PLATFORM/Mac-arm64-maccatalyst/OpenHome/Net/Bindings/Cs/ohNet.net.csproj::TargetFramework=net8.0-maccatalyst]
/Users/hudson/workspace/ohNet/PLATFORM/Mac-arm64-maccatalyst/OpenHome/Net/Bindings/Cs/obj/Debug/net8.0-maccatalyst/ohNet.net.AssemblyInfo.cs(16,12): error CS0579: Duplicate 'System.Reflection.AssemblyInformationalVersionAttribute' attribute [/Users/hudson/workspace/ohNet/PLATFORM/Mac-arm64-maccatalyst/OpenHome/Net/Bindings/Cs/ohNet.net.csproj::TargetFramework=net8.0-maccatalyst]
/Users/hudson/workspace/ohNet/PLATFORM/Mac-arm64-maccatalyst/OpenHome/Net/Bindings/Cs/obj/Debug/net8.0-maccatalyst/ohNet.net.AssemblyInfo.cs(17,12): error CS0579: Duplicate 'System.Reflection.AssemblyProductAttribute' attribute [/Users/hudson/workspace/ohNet/PLATFORM/Mac-arm64-maccatalyst/OpenHome/Net/Bindings/Cs/ohNet.net.csproj::TargetFramework=net8.0-maccatalyst]
/Users/hudson/workspace/ohNet/PLATFORM/Mac-arm64-maccatalyst/OpenHome/Net/Bindings/Cs/obj/Debug/net8.0-maccatalyst/ohNet.net.AssemblyInfo.cs(18,12): error CS0579: Duplicate 'System.Reflection.AssemblyTitleAttribute' attribute [/Users/hudson/workspace/ohNet/PLATFORM/Mac-arm64-maccatalyst/OpenHome/Net/Bindings/Cs/ohNet.net.csproj::TargetFramework=net8.0-maccatalyst]
/Users/hudson/workspace/ohNet/PLATFORM/Mac-arm64-maccatalyst/OpenHome/Net/Bindings/Cs/obj/Debug/net8.0-maccatalyst/ohNet.net.AssemblyInfo.cs(19,12): error CS0579: Duplicate 'System.Reflection.AssemblyVersionAttribute' attribute [/Users/hudson/workspace/ohNet/PLATFORM/Mac-arm64-maccatalyst/OpenHome/Net/Bindings/Cs/ohNet.net.csproj::TargetFramework=net8.0-maccatalyst]
/Users/hudson/workspace/ohNet/PLATFORM/Mac-arm64-maccatalyst/OpenHome/Net/Bindings/Cs/obj/Debug/net8.0-maccatalyst/ohNet.net.AssemblyInfo.cs(20,12): error CS0579: Duplicate 'System.Runtime.Versioning.TargetPlatformAttribute' attribute [/Users/hudson/workspace/ohNet/PLATFORM/Mac-arm64-maccatalyst/OpenHome/Net/Bindings/Cs/ohNet.net.csproj::TargetFramework=net8.0-maccatalyst]
/Users/hudson/workspace/ohNet/PLATFORM/Mac-arm64-maccatalyst/OpenHome/Net/Bindings/Cs/obj/Debug/net8.0-maccatalyst/ohNet.net.nfloat.g.cs(2,14): error CS1537: The using alias 'nfloat' appeared previously in this namespace [/Users/hudson/workspace/ohNet/PLATFORM/Mac-arm64-maccatalyst/OpenHome/Net/Bindings/Cs/ohNet.net.csproj::TargetFramework=net8.0-maccatalyst]