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[Core ML] Avoid unnecessary portable-kernel linkage from coremldelegate

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@metascroy 已经在做这个了。

开始于 2026年9月10日。

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描述

bug module: build/install module: coreml
Problem

The Core ML CMake target links portable_ops_lib and portable_kernels privately when the standalone runner option is enabled. The standalone Xcode runner already links those archives itself, while other Core ML consumers should not pull in a second operator registry.

A proposed switch from link edges to build dependencies surfaced another requirement: add_dependencies fails when portable operators are disabled unless both targets are guarded. This was found during the source-build validation for #22620 and is intentionally excluded from that documentation-only PR.

Proposed change

Use build-order dependencies instead of private linkage where appropriate, guarded with TARGET portable_ops_lib and TARGET portable_kernels.

Test plan
  • Configure the macOS preset with Core ML enabled and portable operators disabled.
  • Build the Core ML runner configuration with portable operators enabled.
  • Run Core ML model and operator CI.

cc @larryliu0820 @GregoryComer @kimishpatel @YifanShenSZ @cymbalrush @metascroy

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