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Invoke RunReadyToRunCompiler task for CoreLib crossgen instead of raw Exec - #135397
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… Exec crossgen-corelib.proj previously bypassed both the dotnet/runtime and dotnet/sdk copies of RunReadyToRunCompiler entirely, invoking crossgen2 directly via <Exec>. Route the non-composite case through the task so CoreLib compilation uses the same code path as every other crossgen2 invocation in the SDK/repo. Flags without a dedicated task parameter are passed through via Crossgen2ExtraCommandLineArgs, mirroring the SDK's own escape hatch for extra args. ShowCompilerWarnings is forced on since the task otherwise demotes "warning:" lines that <Exec> used to surface as build warnings. The Apple mobile composite case keeps the original <Exec> invocation, since the task's composite parameters model a structurally different multi-assembly build than CoreLib's single-assembly --composite usage. Validated for linux-x64 Release: building clr.nativecorelib with the new task-based target produces System.Private.CoreLib.dll and .ni.r2rmap byte-for-byte identical to a freshly rebuilt <Exec>-based baseline, reproducibly across repeated builds. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> Copilot-Session: da7cf090-9a92-453d-beb2-f672a9a7b541
--target-allows-runtime-code-generation, --embed-pgo-data, --verify-type-and-field-layout, and --enable-cached-interface-dispatch-support were duplicated verbatim (same flag text and same conditions) between the composite <Exec> command-string path and the non-composite RunReadyToRunCompiler task-parameter path. Factor them into a single _CoreLibCrossgen2CommonExtraArgs item group computed once and consumed by both: space-joined into the <Exec> command for composite builds, and included in Crossgen2ExtraCommandLineArgs for the task invocation. Verified behavior-preserving: the non-composite path's logged RunReadyToRunCompiler invocation is textually identical before and after this change, and a direct, repeated crossgen2 invocation with fixed inputs confirms the tool itself produces byte-identical output for identical arguments (regardless of flag order), so reordering within the shared item group does not change results. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> Copilot-Session: da7cf090-9a92-453d-beb2-f672a9a7b541
Route the Apple-mobile composite path through RunReadyToRunCompiler instead of a raw <Exec>, using the task's existing CreateCompositeImage/ ReadyToRunCompositeBuildReferences/ReadyToRunCompositeBuildInput parameters - the same mechanism the SDK's own PrepareForReadyToRunCompilation already uses for composite publishing in production. This removes the remaining duplication between the two paths, leaving a single task invocation for both. Validated on Linux (non-composite): the generated RunReadyToRunCompiler command line is byte-for-byte identical before and after this change. The Apple-mobile composite path could not be built locally (no macOS/iOS toolchain available) and relies on code-level review instead. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> Copilot-Session: da7cf090-9a92-453d-beb2-f672a9a7b541
- Remove comments that restated what the code already shows, or that would go stale if the referenced code changed. - Remove a comment claiming a false in-file "convention" precedent for TasksConfiguration. - Remove two Message elements that duplicated logging RunReadyToRunCompiler (a ToolTask) already performs itself. - Restore the pre-existing "wasm: enable cross-module inlining/optimization" comment that was inadvertently dropped when that line was converted to item-group form. - Tie the remaining CompilationEntry composite comment to the equivalent pattern in PrepareForReadyToRunCompilation.cs. Assisted-by: Claude:claude-sonnet-5 Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> Copilot-Session: da7cf090-9a92-453d-beb2-f672a9a7b541
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Tagging subscribers to this area: @dotnet/crossgen-contrib |
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🟡 Changes recommended
Task configuration mismatching can break mixed-configuration builds, and the unrelated WebAssembly argument changes behavior.
2 open findings
What changed in this PR
Replaces CoreLib’s hand-built crossgen2 command with the shared RunReadyToRunCompiler task.
Changes:
- Adds and loads
Crossgen2Tasks. - Maps existing crossgen2 options and composite inputs to task parameters.
- Adds a WebAssembly-specific codegen option.
| File | Description |
|---|---|
src/coreclr/crossgen-corelib.proj |
Migrates CoreLib crossgen2 invocation to the shared task. |
🧠 Review effort: Balanced
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Qualify the invocation to match the local task registration rather than the SDK short-name task, which forces non-composite Wasm compilation into composite mode. Assisted-by: GitHub Copilot CLI:gpt-6.1-sol Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> Copilot-Session: 6c955c02-ee60-478e-8eaf-4222723f5886
Build the new task reference in TasksConfiguration to match the loaded assembly, and remove the obsolete Wasm codegen option introduced by the conversion. Assisted-by: GitHub Copilot CLI:gpt-6.1-sol Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> Copilot-Session: 6c955c02-ee60-478e-8eaf-4222723f5886
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@jkoritzinsky @davidwrighton I'm planning to make some changes to the crossgen task (for caching) and this should ensure that we exercise the task path for corelib. |
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I'm going to mourn that we no longer print out the command line for R2Ring System.Private.CoreLib.dll as part of the build log, but I can learn to live with that if it reduces build costs.
Can the task print that? |
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Its in the binlog, so we do log it... just only at higher verbosity levels which makes sense for the customer scenarios. I suppose we could add a flag to the task to make it log to a lower verbosity level. |
Ok, that's good enough. |
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Converts
src/coreclr/crossgen-corelib.proj's crossgen2 invocation from a hand-built<Exec>command line to the sharedRunReadyToRunCompilerMSBuild task (the same task the SDK uses forPublishReadyToRun), for both the non-composite and composite (Apple-mobile) cases.The non-composite path was validated by diffing the task's logged command line against the original
<Exec>command line — byte-identical. The composite path reuses the exact mechanism (CreateCompositeImage/ReadyToRunCompositeBuildReferences/ReadyToRunCompositeBuildInput) thatPrepareForReadyToRunCompilation.cs/Microsoft.NET.CrossGen.targetsalready use for real composite publishing, but could not be built/tested locally (no macOS/iOS toolchain available).Note
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