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[net11.0] Cache R2R image when only user assemblies are changed #24735

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Merged
rolfbjarne merged 3 commits into from
Feb 26, 2026
Merged

[net11.0] Cache R2R image when only user assemblies are changed #24735

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ad34097
[net11.0] Cache R2R image when only user assemblies are changed
kotlarmilos Feb 18, 2026
b73516c
Improve caching mechanism
kotlarmilos Feb 19, 2026
93c4b82
Hash non-user assemblies using SHA256
kotlarmilos Feb 19, 2026
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30 changes: 30 additions & 0 deletions dotnet/targets/Microsoft.Sdk.R2R.targets
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Original file line number Diff line number Diff line change
Expand Up @@ -76,6 +76,36 @@
<_UserAssemblies Include="@(_ResolvedAssembliesToPublish)" Exclude="@(_NonUserAssemblies)" />
<PublishReadyToRunExcludeTest Include="@(_UserAssemblies -> '%(Filename)')" />
</ItemGroup>

<!-- Hash the R2R input assemblies so we can detect when the set actually changes -->
<GetFileHash Files="@(_NonUserAssemblies)" Algorithm="SHA256">
<Output TaskParameter="Items" ItemName="_NonUserAssembliesWithHash" />
</GetFileHash>
<Hash ItemsToHash="@(_NonUserAssembliesWithHash->'%(FileHash)')" IgnoreCase="false">
<Output TaskParameter="HashResult" PropertyName="_R2RInputHash" />
</Hash>

<PropertyGroup>
<_R2RInputHashFile>$(IntermediateOutputPath)r2r-input.hash</_R2RInputHashFile>
</PropertyGroup>
<!-- Create trigger file before writing hash, so we can compare timestamps -->
<Touch Files="$(_R2RInputHashFile).trigger" AlwaysCreate="true" />

<WriteLinesToFile Lines="$(_R2RInputHash)" File="$(_R2RInputHashFile)" Overwrite="true" WriteOnlyWhenDifferent="true" />

<ItemGroup>
<FileWrites Include="$(_R2RInputHashFile)" />
<FileWrites Include="$(_R2RInputHashFile).trigger" />
</ItemGroup>
</Target>

<!-- Touch R2R outputs when only user assemblies changed. If hash file is older than trigger, hash didn't change, so touch outputs to skip R2R -->
<Target Name="_TouchR2ROutputs"
Condition="'$(FilterReadyToRunAssemblies)' == 'true' And Exists('$(_R2RInputHashFile)') And Exists('$(_R2RInputHashFile).trigger') And $([System.IO.File]::GetLastWriteTime('$(_R2RInputHashFile)').Ticks) &lt; $([System.IO.File]::GetLastWriteTime('$(_R2RInputHashFile).trigger').Ticks)"
AfterTargets="_PrepareForReadyToRunCompilation"
BeforeTargets="_CreateR2RImages">
<Touch Files="%(_ReadyToRunCompileList.OutputR2RImage)"
Condition="Exists('%(_ReadyToRunCompileList.OutputR2RImage)')" />
</Target>

<!--
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