dotnet --getProperty can sometime return more than one value

[spouliot]

Describe the bug

dotnet --getProperty can sometime return more than one value.

This happens with 8.0.201 (on macOS at least) and was working properly (as expected) with 8.0.101.

To Reproduce

> dotnet new android
The template "Android Application" was created successfully.

> dotnet --version
8.0.201

> dotnet build --getProperty:OutputPath
bin\Debug/net8.0-android/
> dotnet build -r:android-arm64 --getProperty:OutputPath
bin\Debug/net8.0-android/android-arm64/
> dotnet build -r:android-arm64 --getProperty:OutputPath -f:net8.0-android
bin\Debug/net8.0-android/android-arm64/
bin\Debug/net8.0-android/android-arm64/

Create a global.json to use dotnet 8.0.101 and re-run the last command:

> dotnet build -r:android-arm64 --getProperty:OutputPath -f:net8.0-android
Build failed. Properties, Items, and Target results cannot be obtained. See details in stderr above.
bin\Debug/net8.0-android/android-arm64/

Disregard the build error (first line) but this prints only the value of OutputPath once.

Exceptions (if any)

This only seems to happen when -f is used.

This is needed for multi-platform projects like MAUI and Uno.

Further technical details

.NET SDK:
 Version:           8.0.201
 Commit:            4c2d78f037
 Workload version:  8.0.200-manifests.22889f84

Runtime Environment:
 OS Name:     Mac OS X
 OS Version:  14.3
 OS Platform: Darwin
 RID:         osx-arm64
 Base Path:   /usr/local/share/dotnet/sdk/8.0.201/

.NET workloads installed:
 [macos]
   Installation Source: SDK 8.0.200
   Manifest Version:    14.2.8022/8.0.100
   Manifest Path:       /usr/local/share/dotnet/sdk-manifests/8.0.100/microsoft.net.sdk.macos/14.2.8022/WorkloadManifest.json
   Install Type:        FileBased

 [ios]
   Installation Source: SDK 8.0.200
   Manifest Version:    17.2.8022/8.0.100
   Manifest Path:       /usr/local/share/dotnet/sdk-manifests/8.0.100/microsoft.net.sdk.ios/17.2.8022/WorkloadManifest.json
   Install Type:        FileBased

 [maccatalyst]
   Installation Source: SDK 8.0.200
   Manifest Version:    17.2.8022/8.0.100
   Manifest Path:       /usr/local/share/dotnet/sdk-manifests/8.0.100/microsoft.net.sdk.maccatalyst/17.2.8022/WorkloadManifest.json
   Install Type:        FileBased

 [maui]
   Installation Source: SDK 8.0.200
   Manifest Version:    8.0.6/8.0.100
   Manifest Path:       /usr/local/share/dotnet/sdk-manifests/8.0.100/microsoft.net.sdk.maui/8.0.6/WorkloadManifest.json
   Install Type:        FileBased

 [android]
   Installation Source: SDK 8.0.200
   Manifest Version:    34.0.79/8.0.100
   Manifest Path:       /usr/local/share/dotnet/sdk-manifests/8.0.100/microsoft.net.sdk.android/34.0.79/WorkloadManifest.json
   Install Type:        FileBased


Host:
  Version:      8.0.2
  Architecture: arm64
  Commit:       1381d5ebd2

.NET SDKs installed:
  6.0.404 [/usr/local/share/dotnet/sdk]
  6.0.408 [/usr/local/share/dotnet/sdk]
  6.0.410 [/usr/local/share/dotnet/sdk]
  7.0.101 [/usr/local/share/dotnet/sdk]
  7.0.105 [/usr/local/share/dotnet/sdk]
  7.0.203 [/usr/local/share/dotnet/sdk]
  7.0.302 [/usr/local/share/dotnet/sdk]
  7.0.304 [/usr/local/share/dotnet/sdk]
  7.0.306 [/usr/local/share/dotnet/sdk]
  7.0.401 [/usr/local/share/dotnet/sdk]
  8.0.100-preview.7.23376.3 [/usr/local/share/dotnet/sdk]
  8.0.100-rc.1.23455.8 [/usr/local/share/dotnet/sdk]
  8.0.100 [/usr/local/share/dotnet/sdk]
  8.0.101 [/usr/local/share/dotnet/sdk]
  8.0.201 [/usr/local/share/dotnet/sdk]

.NET runtimes installed:
  Microsoft.AspNetCore.App 6.0.12 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 6.0.15 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 6.0.16 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 6.0.18 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 7.0.1 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 7.0.5 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 7.0.7 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 7.0.9 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 7.0.11 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 8.0.0-preview.7.23375.9 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 8.0.0-rc.1.23421.29 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 8.0.0 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 8.0.1 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 8.0.2 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 6.0.12 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 6.0.15 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 6.0.16 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 6.0.18 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 7.0.1 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 7.0.5 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 7.0.7 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 7.0.9 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 7.0.11 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 8.0.0-preview.7.23375.6 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 8.0.0-rc.1.23419.4 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 8.0.0 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 8.0.1 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 8.0.2 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]

Other architectures found:
  None

Environment variables:
  Not set

global.json file:
  Not found

Learn more:
  https://aka.ms/dotnet/info

Download .NET:
  https://aka.ms/dotnet/download

[baronfel]

I think I'm seeing this as well in #38811, where I'm trying to use it to do testing. This issue should move to dotnet/msbuild though. I'll transfer.

[baronfel]

Interesting note that -f is a requirement here - is the inner/outer build check in the SDK targets to blame here?

[ladipro]

With -f, MSBuild is invoked twice:
-maxcpucount -verbosity:m -target:Restore -property:RuntimeIdentifier=android-arm64 -property:_CommandLineDefinedRuntimeIdentifier=true --getProperty:OutputPath <loggers>
and
-maxcpucount -verbosity:m -nologo -consoleloggerparameters:Summary -property:TargetFramework=net8.0-android -property:RuntimeIdentifier=android-arm64 -property:_CommandLineDefinedRuntimeIdentifier=true --getProperty:OutputPath <loggers>

Without -f, it is invoked only once:
-maxcpucount -verbosity:m -restore -consoleloggerparameters:Summary -property:RuntimeIdentifier=android-arm64 -property:_CommandLineDefinedRuntimeIdentifier=true --getProperty:OutputPath <loggers>

The reason why it appeared to work as expected in 8.0.100 is dotnet/msbuild#9339 which was fixed in 8.0.200. The Build failed. ... output is actually relevant.

@baronfel I'm afraid this should go back to dotnet/sdk as these are unexpected interactions between restore and the new switches.

[baronfel]

This is fixed in the 8.0.3xx nightlies, and will go out with I believe the April build of the 8.0.2xx series at this point.