NETSDK1112 when targeting .NET 9 from .NET 10 and specifying a non-downloaded rid

[jonpryor]

Android framework version

net9.0-android

Affected platform version

.NET 10 Preview 7

Description

This looks like it'll be a weird one…

Setup: assume a "clean machine". Specifically, that you don't have the microsoft.android.runtime.35.android-arm64 NuGet packages downloaded:

rm -Rf $HOME/.nuget/packages/microsoft.android.runtime.35.android-arm64

Using .NET 10 Preview 7, create a new Android app template:

dotnet new android -n net10-android-netsdk1112

Edit net10-android-netsdk1112/net10-android-netsdk1112.csproj so that $(TargetFramework) is net9.0:

diff --git a/net10-android-netsdk1112.csproj b/net10-android-netsdk1112.csproj
index 7e6b48f..1c88b86 100644
--- a/net10-android-netsdk1112.csproj
+++ b/net10-android-netsdk1112.csproj
@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFramework>net10.0-android</TargetFramework>
+    <TargetFramework>net9.0-android</TargetFramework>^M
     <SupportedOSPlatformVersion>24</SupportedOSPlatformVersion>
     <RootNamespace>net10_android_netsdk1112</RootNamespace>
     <OutputType>Exe</OutputType>

Build the project, specifying a rid:

dotnet build -r android-arm64

It fails:

    info NETSDK1057: You are using a preview version of .NET. See: https://aka.ms/dotnet-support-policy
  net10-android-netsdk1112 failed with 1 error(s) (0.0s)
    $HOME/Downloads/dotnet-sdk-10.0.100-preview.7.25380.108-osx-x64/sdk/10.0.100-preview.7.25380.108/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.FrameworkReferenceResolution.targets(528,5): error NETSDK1112: The runtime pack for Microsoft.Android.Runtime.35.android-arm64 was not downloaded. Try running a NuGet restore with the RuntimeIdentifier 'android-arm64'.
  net10-android-netsdk1112 failed (4.1s) → bin/Debug/net9.0-android/android-arm64/net10-android-netsdk1112.dll

Interestingly, the NETSDK1112 only happens when (1) using .NET 10 to build a .NET 9 project and (2) specifying a rid.

If you don't specify the rid, it builds:

dotnet build

After which $HOME/.nuget/packages/microsoft.android.runtime.35.android-arm64 exists, and thus after which specifying a rid will work:

dotnet build -r android-arm64

which means that to fully reproduce this you must nuke $HOME/.nuget/packages/microsoft.android.runtime.35.android-arm64.

Alternatively, it works if you use the .NET 9 SDK to build.

rm -Rf $HOME/.nuget/packages/microsoft.android.runtime.35.android-arm64
dotnet build -r android-arm64
# works if .NET 9 is used

Steps to Reproduce

Did you find any workaround?

Either use the .NET 9 SDK, or perform a "non-rid build" before performing a rid build.

Relevant log output

[jonathanpeppers]

Does the same problem occur with a net9.0-android36 project? (using stable .NET SDK)

Basically, any time the runtime pack has to be restored from NuGet? We only put the default runtime pack in the workload today.

[jonpryor]

@jonathanpeppers asked:

Does the same problem occur with a net9.0-android36 project? (using stable .NET SDK)

From the original description:

Alternatively, it works if you use the .NET 9 SDK to build.

rm -Rf $HOME/.nuget/packages/microsoft.android.runtime.35.android-arm64
dotnet build -r android-arm64
# works if .NET 9 is used

i.e. when $(TargetFramework)=net9.0-android and you build with .NET 9, it works.

Let's elaborate this into tabular form:

$(TargetFramework)	.NET SDK	Success?
net10.0-android	10.0.100-preview.7.25380.108	✅
net10.0-android36.0	10.0.100-preview.7.25380.108	✅
net9.0-android	10.0.100-preview.7.25380.108	❌ error NETSDK1112: The runtime pack for Microsoft.Android.Runtime.35.android-arm64 was not downloaded. Try running a NuGet restore with the RuntimeIdentifier 'android-arm64'.
net9.0-android35.0	10.0.100-preview.7.25380.108	❌ error NETSDK1112: The runtime pack for Microsoft.Android.Runtime.35.android-arm64 was not downloaded. Try running a NuGet restore with the RuntimeIdentifier 'android-arm64'.
net9.0-android	9.0.300	✅
net9.0-android36.0	9.0.300	✅
net8.0-android	9.0.300	❌ error NETSDK1112: The runtime pack for Microsoft.Android.Runtime.34.android-arm64 was not downloaded.

Oddly, building with net10.0-android* doesn't actually cause $HOME/.nuget/packages/microsoft.android.runtime.* to be created, even though the project builds.

The other observation that sticks out is that dotnet build -r RID can only reliably be used initially when $(TargetFramework) matches the .NET SDK version, e.g. net10.0 atop .NET 10 or net9.0 atop .NET 9, etc. Using a $(TargetFramework) value against one less than the .NET SDK version, e.g. net9.0 atop .NET 10 or net8.0 atop .NET 9, consistently fails.

# .NET SDK 9.0.300
# .csproj has `$(TargetFramework)`=net8.0-android
% rm -Rf $HOME/.nuget/packages/microsoft.android.runtime.* ; dotnet build -r android-arm64 *.csproj
Restore complete (0.6s)
  net10-android-netsdk1112 failed with 1 error(s) (0.0s)
    /usr/local/share/dotnet/sdk/9.0.300/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.FrameworkReferenceResolution.targets(512,5): error NETSDK1112: The runtime pack for Microsoft.Android.Runtime.34.android-arm64 was not downloaded. Try running a NuGet restore with the RuntimeIdentifier 'android-arm64'.
  net10-android-netsdk1112 failed (7.0s) → bin/Debug/net8.0-android/android-arm64/net10-android-netsdk1112.dll

Build failed with 1 error(s) in 8.3s

Above shows how building for net8.0-android atop .NET 9 fails.

Meanwhile, dotnet build without -r RID works:

% rm -Rf $HOME/.nuget/packages/microsoft.android.runtime.* ; dotnet build *.csproj               
zsh: no matches found: /Users/jon/.nuget/packages/microsoft.android.runtime.*
Restore complete (1.4s)
  net10-android-netsdk1112 succeeded (14.0s) → bin/Debug/net8.0-android/net10-android-netsdk1112.dll

Build succeeded in 16.3s

% ls -ld $HOME/.nuget/packages/microsoft.android.runtime.*
drwxr-xr-x  3 jon  staff  96 Sep  3 14:01 /Users/jon/.nuget/packages/microsoft.android.runtime.34.android-arm
drwxr-xr-x  3 jon  staff  96 Sep  3 14:01 /Users/jon/.nuget/packages/microsoft.android.runtime.34.android-arm64
drwxr-xr-x  3 jon  staff  96 Sep  3 14:01 /Users/jon/.nuget/packages/microsoft.android.runtime.34.android-x64
drwxr-xr-x  3 jon  staff  96 Sep  3 14:01 /Users/jon/.nuget/packages/microsoft.android.runtime.34.android-x86

And now dotnet build -r RID works:

% rm -Rf bin obj; dotnet build -r android-arm64 *.csproj                          
Restore complete (0.6s)
  net10-android-netsdk1112 succeeded (14.1s) → bin/Debug/net8.0-android/android-arm64/net10-android-netsdk1112.dll

Build succeeded in 15.7s