Load external LLVM pass plugins via Swift frontend

[afrighetto (Antonio Frighetto)]

Hello,

While working on our downstream project based on LLVM, we have identified the need to dynamically load LLVM passes during compilation. Apple Clang offers this possibility via -fpass-plugin option, which allows the driver to forward the plugin to LLVM. However, it seems that the Swift frontend/driver doesn't have a comparable feature.

I believe introducing a similar option to the Swift compiler might be beneficial, yet, before considering a patch in this direction, I would be grateful for a feedback from the community.

Thank you.

[Douglas_Gregor]

@afrighetto

I believe introducing a similar option to the Swift compiler might be beneficial, yet, before considering a patch in this direction, I would be grateful for a feedback from the community.

Do you mean re-exposing Clang's -fpass-plugin through the Swift driver, or do you mean something specific to Swift?

Doug

[afrighetto (Antonio Frighetto)]

Do you mean re-exposing Clang's -fpass-plugin through the Swift driver, or do you mean something specific to Swift?

Yes, I mean providing the Swift driver (and frontend) with Clang's -fpass-plugin option (mimic Clang's behaviour). Sorry for not clarifying it better.