Steven Wu 719edaf7e2 [BridgingHeader] Fix auto-chaining when only dependency has bridging header ...

When enable bridging header auto chaining, it is possible for the
compilation to have a PCH file input for the bridging header from a
binary swift module dependency. In this case, we should not report a
bridging header for current module as bridging header can be leaking out
through swiftinterface file.

To fully distinguish the PCH files passed in through different
situation, here are the situations:
* If no chaining is used, only `-import-objc-header` option is used and
  it can be used to pass either a header file or a PCH file depending if
  GeneratePCH job is requested or not.
* If chaining is enabled, `-import-objc-header` is only used to pass the
  header file and `-import-pch` is used to pass PCH file. Chaining mode
  requires PCH generation if bridging header is used.

rdar://144623388

2025-02-12 07:30:14 -08:00

169 KiB

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