[armel] Broken build

[alpencolt]

Build on main branch is broken for armel arch, but works before.

 ./build.sh --portablebuild false --cross --clang9 --arch armel --runtimeConfiguration Release --librariesConfiguration Release --subset clr+libs.native /p:EnableSourceLink=false 
__DistroRid: tizen.6.5.0-armel
  Determining projects to restore...
  Tool 'coverlet.console' (version '1.7.2') was restored. Available commands: coverlet
  Tool 'dotnet-reportgenerator-globaltool' (version '4.5.8') was restored. Available commands: reportgenerator
  Tool 'microsoft.dotnet.xharness.cli' (version '1.0.0-prerelease.21370.1') was restored. Available commands: xharness
  Tool 'microsoft.visualstudio.slngen.tool' (version '6.0.1') was restored. Available commands: slngen
  
  Restore was successful.
  All projects are up-to-date for restore.
  Determining projects to restore...
/home/alexander/src/runtime/.dotnet/sdk/6.0.100-preview.5.21302.13/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.FrameworkReferenceResolution.targets(101,5): error NETSDK1084: There is no application host available for the specified RuntimeIdentifier 'linux-armel'. [/home/alexander/src/runtime/Build.proj]
/home/alexander/src/runtime/.dotnet/sdk/6.0.100-preview.5.21302.13/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.FrameworkReferenceResolution.targets(101,5): error NETSDK1084: There is no application host available for the specified RuntimeIdentifier 'linux-armel'. [/home/alexander/src/runtime/Build.proj]
/home/alexander/src/runtime/.dotnet/sdk/6.0.100-preview.5.21302.13/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.FrameworkReferenceResolution.targets(101,5): error NETSDK1084: There is no application host available for the specified RuntimeIdentifier 'linux-armel'. [/home/alexander/src/runtime/Build.proj]
/home/alexander/src/runtime/.dotnet/sdk/6.0.100-preview.5.21302.13/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.FrameworkReferenceResolution.targets(101,5): error NETSDK1084: There is no application host available for the specified RuntimeIdentifier 'linux-armel'. [/home/alexander/src/runtime/Build.proj]

Build FAILED.

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Issue Details

---

Build on main branch is broken for armel arch, but works before.

 ./build.sh --portablebuild false --cross --clang9 --arch armel --runtimeConfiguration Release --librariesConfiguration Release --subset clr+libs.native /p:EnableSourceLink=false 
__DistroRid: tizen.6.5.0-armel
  Determining projects to restore...
  Tool 'coverlet.console' (version '1.7.2') was restored. Available commands: coverlet
  Tool 'dotnet-reportgenerator-globaltool' (version '4.5.8') was restored. Available commands: reportgenerator
  Tool 'microsoft.dotnet.xharness.cli' (version '1.0.0-prerelease.21370.1') was restored. Available commands: xharness
  Tool 'microsoft.visualstudio.slngen.tool' (version '6.0.1') was restored. Available commands: slngen
  
  Restore was successful.
  All projects are up-to-date for restore.
  Determining projects to restore...
/home/alexander/src/runtime/.dotnet/sdk/6.0.100-preview.5.21302.13/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.FrameworkReferenceResolution.targets(101,5): error NETSDK1084: There is no application host available for the specified RuntimeIdentifier 'linux-armel'. [/home/alexander/src/runtime/Build.proj]
/home/alexander/src/runtime/.dotnet/sdk/6.0.100-preview.5.21302.13/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.FrameworkReferenceResolution.targets(101,5): error NETSDK1084: There is no application host available for the specified RuntimeIdentifier 'linux-armel'. [/home/alexander/src/runtime/Build.proj]
/home/alexander/src/runtime/.dotnet/sdk/6.0.100-preview.5.21302.13/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.FrameworkReferenceResolution.targets(101,5): error NETSDK1084: There is no application host available for the specified RuntimeIdentifier 'linux-armel'. [/home/alexander/src/runtime/Build.proj]
/home/alexander/src/runtime/.dotnet/sdk/6.0.100-preview.5.21302.13/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.FrameworkReferenceResolution.targets(101,5): error NETSDK1084: There is no application host available for the specified RuntimeIdentifier 'linux-armel'. [/home/alexander/src/runtime/Build.proj]

Build FAILED.

Author:	alpencolt
Assignees:	-
Labels:	area-Infrastructure, untriaged
Milestone:	-

[ViktorHofer]

@am11 do you think this is related to one of your recent RID changes?

[am11]

I do not think this is reproducible in the main branch otherwise the CI leg @clamp03 is adding in #56281 would have failed.

[am11]

Ah ok, this issue was opened a few hours before #55789 was merged, so maybe just give it another try with latest main. 😅

[am11]

Tested with:

$ docker run -e ROOTFS_DIR=/crossrootfs/armel -v$(pwd):/runtime \
    mcr.microsoft.com/dotnet-buildtools/prereqs:ubuntu-18.04-cross-armel-tizen-20210719212651-8b02f56 \
    /runtime/build.sh --portablebuild false --cross --clang9 --arch armel --runtimeConfiguration Release \
    --librariesConfiguration Release --subset clr+libs.native /p:EnableSourceLink=false  

the restore has succeeded (and it's building coreclr code base).

[am11]

@ViktorHofer, regarding the upfront restore, the error @alpencolt encountered:

Determining projects to restore...
/home/alexander/src/runtime/.dotnet/sdk/6.0.100-preview.5.21302.13/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.FrameworkReferenceResolution.targets(101,5): error NETSDK1084: There is no application host available for the specified RuntimeIdentifier 'linux-armel'. [/home/alexander/src/runtime/Build.proj]

doesn't tell us the name of actual project (in this case, it's /home/alexander/src/runtime/src/coreclr/tools/aot/crossgen2/crossgen2.csproj). Can we augment the NETSDK1084 error message so it capture the name of actual project when using traversal feature?

[alpencolt]

Looks #55789 fixes issue, now armel build is successful.
Thank you!