HelloiOS sample does not build with dotnet 6.0.100-alpha about maui-samples HOT 9 CLOSED

@vkacherov just to check, you are using the latest on the main branch?

We had someone else hit an error like this, and SourceTree didn't clone the Github "default" branch.

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@rolfbjarne I think @mdh1418 is having the same problem, so there might be an issue with -t:Run for iOS?

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I tried running the sample using sdk 5.0.100-rc.1.20466.16, 5.0.100-rc.1.20452.5, 5.0.100-rc.2.20459.1 (as expected by the repository) and still ran into that error with dotnet build HelloiOS/HelloiOS.csproj -t:Run. (Also had tried it with 6.0.100-alpha.1.20479.7`

I believe dotnet build itself succeeded for 5.0.1xx, but failed on 6.0.100-alpha.1.20479.7 with

/usr/local/share/dotnet/sdk/6.0.100-alpha.1.20479.7/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.TargetFrameworkInference.targets(213,5): error NETSDK1140: 13.6 is not a valid TargetPlatformVersion for iOS. Valid versions include: [/Users/mdhwang/net6-samples/HelloiOS/HelloiOS.csproj]
/usr/local/share/dotnet/sdk/6.0.100-alpha.1.20479.7/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.TargetFrameworkInference.targets(213,5): error NETSDK1140: None [/Users/mdhwang/net6-samples/HelloiOS/HelloiOS.csproj]

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The known good version of .NET for this repo is here:

https://github.com/xamarin/net6-samples/blob/c0aff44b08420f8250296f7ec1318ac2bf1081b8/azure-pipelines.yml#L10

Depending on the build, an MSBuild property was renamed recently, which can cause the NETSDK1140 error:

dotnet/sdk@37d5ade

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Using the known good version works for me:

$ git clean -xfd
$ git diff global.json
diff --git a/global.json b/global.json
index 0f80674..b5ac7f9 100644
--- a/global.json
+++ b/global.json
@@ -1,4 +1,5 @@
 {
+    "sdk": { "version": "5.0.100-rc.2.20459.1" },
     "msbuild-sdks": {
             "Microsoft.iOS.Sdk": "13.6.100-ci.main.379",
             "Microsoft.Android.Sdk": "11.0.100-ci.master.127"
$ dotnet build HelloiOS/HelloiOS.csproj
Microsoft (R) Build Engine version 16.8.0-preview-20454-01+b33e5486f for .NET
Copyright (C) Microsoft Corporation. All rights reserved.

  Determining projects to restore...
  Restored /Users/rolf/work/net6-samples/HelloiOS/HelloiOS.csproj (in 1.77 sec).
  You are using a preview version of .NET. See: https://aka.ms/dotnet-core-preview
  HelloiOS -> /Users/rolf/work/net6-samples/HelloiOS/bin/Debug/net5.0-ios/ios-x64/HelloiOS.dll
  Detected signing identity:
          
    Bundle Id: com.microsoft.net5.helloios
    App Id: com.microsoft.net5.helloios
  Optimizing assemblies for size, which may change the behavior of the app. Be sure to test after publishing. See: https://aka.ms/dotnet-illink

Build succeeded.
    0 Warning(s)
    0 Error(s)

Time Elapsed 00:00:19.94

other versions don't work (with the error reported here).

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@jonathanpeppers maybe we should bump to 5.0.100-rc.2.20480.7 here (and use updated packages, our main packages (version14.0.100-ci.main.558 for instance) support the new msbuild variable name)

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I'll work on a PR that will give specific download URLs in the instructions and update our packages.

I think the original problem is the Run target may not be working:

$ dotnet build HelloiOS/HelloiOS.csproj -t:Run
...
/usr/local/share/dotnet/sdk/6.0.100-alpha.1.20479.7/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.targets(814,5): error MSB3073: The command "dotnet exec "/Users/vadim/projects/net6-samples/HelloiOS/bin/Debug/net5.0-ios/ios-x64/HelloiOS.dll"" exited with code 129. [/Users/vadim/projects/net6-samples/HelloiOS/HelloiOS.csproj]

But I'll test this and see if it works for me.

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@rolfbjarne even using Microsoft.iOS.Sdk 14.0.100-ci.main.559, I'm hitting the issue using -t:Run for the iOS app:

/usr/local/share/dotnet/sdk/5.0.100-rc.2.20480.7/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.targets(814,5): error MSB3073: The command "dotnet exec "/Users/jopepper/src/net5-samples/HelloiOS/bin/Debug/net5.0-ios/ios-x64/HelloiOS.dll"" exited with code 131. [/Users/jopepper/src/net5-samples/HelloiOS/HelloiOS.csproj]

It's like it is using the built-in Run target, and maybe the iOS SDK needs to replace it? Android is using it's own Run target now:

https://github.com/xamarin/xamarin-android/blob/d1df638ec1d1f22cd37718814ac635eec5b3f472/src/Xamarin.Android.Build.Tasks/Microsoft.Android.Sdk/targets/Microsoft.Android.Sdk.Application.targets#L26

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Yes, I can reproduce that, I'll have a look.

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