Unable to compile TipCalc.Core

[nickrandolph]

Attempted to change TipCalc.Core to be just a regular netstandard library. TipCalc.Core compiles ok but TipCalc.UI fails to compile (see full error below).

Code is checked into branch https://github.com/nickrandolph/UnoSamples/tree/bugs/netstandardlibraryfail

NU1603: runtime.native.System.IO.Compression 4.3.0 depends on runtime.win10-arm64.runtime.native.System.IO.Compression (>= 4.3.0) but runtime.win10-arm64.runtime.native.System.IO.Compression 4.3.0 was not found. An approximate best match of runtime.win10-arm64.runtime.native.System.IO.Compression 4.3.1 was resolved. 1>------ Rebuild All started: Project: TipCalc.Core, Configuration: Debug Any CPU ------ 1>TipCalc.Core -> c:\XXXXX\UnoSamples\TipCalc\TipCalc.Core\bin\Debug\netstandard1.0\TipCalc.Core.dll 2>------ Rebuild All started: Project: TipCalc.UI, Configuration: Debug Any CPU ------ 2>C:\Program Files (x86)\Microsoft Visual Studio\Preview\Professional\MSBuild\Xamarin\iOS\Xamarin.Messaging.targets(41,3): warning VSX1000: No enough information has been provided to MSBuild in order to establish a connection to a Remote Server. The project 'TipCalc.UI' will continue building offline 2>Done building project "TipCalc.UI.csproj". 2>c:\XXXXX.nuget\packages\uno.sourcegenerationtasks\1.21.0\build\Xamarin.iOS10\Uno.SourceGenerationTasks.targets(94,3): error : System.InvalidOperationException: The project(s) TipCalc.Core did not provide any metadata reference. This may be due to an invalid path, such as $(SolutionDir) being used in the csproj; try using relative paths instead.This may also be related to a missing default configuration directive. Refer to the Uno.SourceGenerator Readme.md file for more details. 2>c:\XXXXX.nuget\packages\uno.sourcegenerationtasks\1.21.0\build\Xamarin.iOS10\Uno.SourceGenerationTasks.targets(94,3): error : at Uno.SourceGeneration.Host.SourceGeneratorHost.d4.MoveNext() in C:\projects\uno-sourcegeneration\src\Uno.SourceGenerationHost.Shared\SourceGeneratorHost.cs:line 303 2>Done building project "TipCalc.UI.csproj" -- FAILED. 2>C:\Program Files\dotnet\sdk\2.1.300\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(198,5): error : Assets file 'c:\XXXXX\UnoSamples\TipCalc\TipCalc.Core\obj\project.assets.json' doesn't have a target for 'UAP,Version=v10.0'. Ensure that restore has run and that you have included 'uap10.0' in the TargetFrameworks for your project. 2>Done building project "TipCalc.Core.csproj" -- FAILED. 2>c:\XXXXX.nuget\packages\uno.sourcegenerationtasks\1.21.0\build\MonoAndroid\Uno.SourceGenerationTasks.targets(94,3): error : System.InvalidOperationException: The project(s) TipCalc.Core did not provide any metadata reference. This may be due to an invalid path, such as $(SolutionDir) being used in the csproj; try using relative paths instead.This may also be related to a missing default configuration directive. Refer to the Uno.SourceGenerator Readme.md file for more details. 2>c:\XXXXX.nuget\packages\uno.sourcegenerationtasks\1.21.0\build\MonoAndroid\Uno.SourceGenerationTasks.targets(94,3): error : at Uno.SourceGeneration.Host.SourceGeneratorHost.d4.MoveNext() in C:\projects\uno-sourcegeneration\src\Uno.SourceGenerationHost.Shared\SourceGeneratorHost.cs:line 303 2>Done building project "TipCalc.UI.csproj" -- FAILED. ========== Rebuild All: 1 succeeded, 1 failed, 0 skipped ==========

[nickrandolph]

@jeromelaban tagging you so that you know where to find the failing netstandard example

[jeromelaban]

Right, so you are hitting this issue https://github.com/nventive/Uno.SourceGeneration/issues/2, which is caused by https://github.com/dotnet/roslyn/issues/23114.

The resolution for now is to add xamarinios10 and MonoAndroid80 (or similar) target frameworks to the cross targeted project TipCalc.Core. This issue only affects projects present in the solution, not projects built outside (or Nuget packages for that matter).