optee-utee-build linker.rs doesn't do proper preprocessing

[alexhoppus]

Hi,

I’m working on OP-TEE OS and my changes touch ta.ld.S. I noticed that optee-utee-build uses ta.ld.S as an input template for linker.rs, but doesn’t actually preprocess it: lines beginning with # are filtered out rather than evaluated.

That means it seems that any conditional logic in ta.ld.S (e.g., #ifdef, #if/#else/#endif) is not applied when generating the final .lds for Rust TAs. Per my understanding this can lead to the generated script containing unintended sections or both conditional branches, and it makes Rust TA linking behavior diverge from the OP-TEE build.

Do you consider this as an issue? If so, are there any plans to address it? If not, I’m happy to contribute a fix, but I’d appreciate guidance on the preferred approach.

Thanks!

cc: @ivila

[ivila]

1. Do you consider this an issue?

Yes, I do.

2. Are there any plans to address it?

There weren't originally, but I'm going to work on a fix today. Contributions of any kind are more than welcome, and I don’t have a specific approach in mind—feel free to tackle it however you see fit!