Fix crossgen2 invocation error under sourcebuild

[ViktorHofer]

Unsure if this is the right direction but wanted to open the PR to make some progress on unblocking the installer PR.

See failure in dotnet/installer#17524

/vmr/src/runtime/artifacts/source-build/self/src/dotnet.sh /vmr/src/runtime/artifacts/source-build/self/src/artifacts/bin/coreclr/linux.x64.Release/x64/crossgen2/tools/crossgen2.dll -o:/vmr/src/runtime/artifacts/source-build/self/src/artifacts/bin/coreclr/linux.x64.Release/System.Private.CoreLib.dll -r:/vmr/src/runtime/artifacts/source-build/self/src/artifacts/bin/coreclr/linux.x64.Release/IL/*.dll --targetarch:x64 --targetos:linux -O /vmr/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:/vmr/src/runtime/artifacts/source-build/self/src/artifacts/bin/coreclr/linux.x64.Release/
You must install or update .NET to run this application.
App: /vmr/src/runtime/artifacts/source-build/self/src/artifacts/bin/coreclr/linux.x64.Release/x64/crossgen2/tools/crossgen2.dll
Architecture: x64
Framework: 'Microsoft.NETCore.App', version '8.0.0-preview.7.23375.6' (x64)
.NET location: /vmr/.dotnet/
The following frameworks were found:
9.0.0-alpha.1.23470.17 at [/vmr/.dotnet/shared/Microsoft.NETCore.App]

@jkoritzinsky why do we invoke crossgen2.dll manually here instead of going through the SDK integration?

One more question, why does runtimeconfig.json list 8.0.0-preview.7.23375.6? Shouldn't we require 9.0.0-alpha.1.23470.17 during source build?

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Issue Details

---

Unsure if this is the right direction but wanted to open the PR to make some progress on unblocking the installer PR.

See failure in dotnet/installer#17524

/vmr/src/runtime/artifacts/source-build/self/src/dotnet.sh /vmr/src/runtime/artifacts/source-build/self/src/artifacts/bin/coreclr/linux.x64.Release/x64/crossgen2/tools/crossgen2.dll -o:/vmr/src/runtime/artifacts/source-build/self/src/artifacts/bin/coreclr/linux.x64.Release/System.Private.CoreLib.dll -r:/vmr/src/runtime/artifacts/source-build/self/src/artifacts/bin/coreclr/linux.x64.Release/IL/*.dll --targetarch:x64 --targetos:linux -O /vmr/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:/vmr/src/runtime/artifacts/source-build/self/src/artifacts/bin/coreclr/linux.x64.Release/
You must install or update .NET to run this application.
App: /vmr/src/runtime/artifacts/source-build/self/src/artifacts/bin/coreclr/linux.x64.Release/x64/crossgen2/tools/crossgen2.dll
Architecture: x64
Framework: 'Microsoft.NETCore.App', version '8.0.0-preview.7.23375.6' (x64)
.NET location: /vmr/.dotnet/
The following frameworks were found:
9.0.0-alpha.1.23470.17 at [/vmr/.dotnet/shared/Microsoft.NETCore.App]

@jkoritzinsky why do we invoke crossgen2.dll manually here instead of going through the SDK integration?

Author:	ViktorHofer
Assignees:	ViktorHofer
Labels:	area-Infrastructure-coreclr
Milestone:	-

[jkoritzinsky]

We invoke it manually as we never moved this project to use the SDK integration. Also the SDK integration expects there to be a runtime pack, which CoreLib doesn't have.

The crossgen2_inbuild project targets NetCoreAppToolCurrent, so that's where the 8.0 version number comes from.

[ViktorHofer]

@jkoritzinsky and I talked about this offline and he believes that this might only fix the first point of failure. We believe that a better path going forward would be updating NetCoreAppToolCurrent to NetCoreAppCurrent when running under source build.

[mthalman]

I've logged #93666 to track the issue.