Ability to mark a method to be ignored by codegen

[qdot]

Is your feature request related to a problem? Please describe. I've got a JNI_OnLoad method that I have to export "C" in order for JNI to call it on init.

This method doesn't need to be exported to dart at all, but seems to be no matter what. I also need to build this library on iOS, which means I don't want the JNI picked up there (it'll generate into the iOS headers and definitely won't build there), but it doesn't look like codegen parses cfg(target) attributes I currently have guarding it.

Describe the solution you'd like

A way to mark a method to not be exported by codegen even if it is marked pub/extern.

Describe alternatives you've considered

Currently I'm just dividing my main input modules into ios/android and generating through those.

[fzyzcjy]

I agree. Feel free to make a PR!

[qdot]

@fzyzcjy Would you be ok with an addition to the codegen RawOpts to just ignore certain files, the paths of which would be passed in a vec? I feel like trying to parse out fn attributes might be a bit difficult.

[fzyzcjy]

LGTM :)

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