[release/7.0.2xx] Runtime fails to generate native System.Private.CoreLib in source-build bootstrap

I have been looking at this issue for a little bit and can’t seem to make any progress, so I’m hoping someone here can point me in the right direction.

The runtime-portable build is failing in the 7.0.2xx source build bootstrap scenario only with the following error:

      Generating native image of System.Private.CoreLib for Linux.x64.Release. Logging to 
      /tarball/src/runtime/artifacts/source-build/self/src/dotnet.sh /tarball/src/runtime/artifacts/source-build/self/src/artifacts/bin/coreclr/Linux.x64.Release/crossgen2/crossgen2.dll -o:/tarball/src/runtime/artifacts/source-build/self/src/artifacts/bin/coreclr/Linux.x64.Release/System.Private.CoreLib.dll -r:/tarball/src/runtime/artifacts/source-build/self/src/artifacts/bin/coreclr/Linux.x64.Release/IL/*.dll --targetarch:x64 -O /tarball/src/runtime/artifacts/source-build/self/src/artifacts/bin/coreclr/Linux.x64.Release/IL/System.Private.CoreLib.dll --perfmap-format-version:1 --perfmap --perfmap-path:/tarball/src/runtime/artifacts/source-build/self/src/artifacts/bin/coreclr/Linux.x64.Release/
      Specify which project file to use because this '/tarball/src/runtime/artifacts/source-build/self/src/src/coreclr' contains more than one project file.
    /tarball/src/runtime/artifacts/source-build/self/src/src/coreclr/crossgen-corelib.proj(104,5): error MSB3073: The command "/tarball/src/runtime/artifacts/source-build/self/src/dotnet.sh /tarball/src/runtime/artifacts/source-build/self/src/artifacts/bin/coreclr/Linux.x64.Release/crossgen2/crossgen2.dll -o:/tarball/src/runtime/artifacts/source-build/self/src/artifacts/bin/coreclr/Linux.x64.Release/System.Private.CoreLib.dll -r:/tarball/src/runtime/artifacts/source-build/self/src/artifacts/bin/coreclr/Linux.x64.Release/IL/*.dll --targetarch:x64 -O /tarball/src/runtime/artifacts/source-build/self/src/artifacts/bin/coreclr/Linux.x64.Release/IL/System.Private.CoreLib.dll --perfmap-format-version:1 --perfmap --perfmap-path:/tarball/src/runtime/artifacts/source-build/self/src/artifacts/bin/coreclr/Linux.x64.Release/" exited with code 1.
    
    Build FAILED.
    
    /tarball/src/runtime/artifacts/source-build/self/src/src/coreclr/crossgen-corelib.proj(104,5): error MSB3073: The command "/tarball/src/runtime/artifacts/source-build/self/src/dotnet.sh /tarball/src/runtime/artifacts/source-build/self/src/artifacts/bin/coreclr/Linux.x64.Release/crossgen2/crossgen2.dll -o:/tarball/src/runtime/artifacts/source-build/self/src/artifacts/bin/coreclr/Linux.x64.Release/System.Private.CoreLib.dll -r:/tarball/src/runtime/artifacts/source-build/self/src/artifacts/bin/coreclr/Linux.x64.Release/IL/*.dll --targetarch:x64 -O /tarball/src/runtime/artifacts/source-build/self/src/artifacts/bin/coreclr/Linux.x64.Release/IL/System.Private.CoreLib.dll --perfmap-format-version:1 --perfmap --perfmap-path:/tarball/src/runtime/artifacts/source-build/self/src/artifacts/bin/coreclr/Linux.x64.Release/" exited with code 1.
        0 Warning(s)
        1 Error(s)

Inside src/coreclr are multiple project files, crossgen-corelib.proj, runtime.proj, and runtime-prereqs.proj. I checked that these are also present in the runtime that’s in .NET 7.0.1xx. I also checked that the error from the .NET CLI isn’t new to .NET 7.0.2xx. I’m not sure where else to look. Maybe @ViktorHofer knows who to tag?

[akoeplinger]

it sets RuntimeIdentifiers but no RuntimeIdentifier? And do you use one of the following SelfContained or Publish* properties?

This is also the default setup for Android/iOS builds, see e.g.:

https://github.com/xamarin/xamarin-android/blob/ac643dddb5e9ef968fa758a6bc77a084242780e7/src/Xamarin.Android.Build.Tasks/Microsoft.Android.Sdk/targets/Microsoft.Android.Sdk.DefaultProperties.targets#L71-L73

[jkotas]

it sets RuntimeIdentifiers but no RuntimeIdentifier? And do you use one of the following SelfContained or Publish* properties?

Yes, crossgen project does exactly that: https://github.com/dotnet/runtime/tree/main/src/coreclr/tools/aot/crossgen2

Another option may be: AppendRuntimeIdentifierToOutputPath = false

This sounds like the most appropriate fix. Submitted https://github.com/dotnet/runtime/pull/78733 (verified locally that it fixes the build break)