Hi everyone,

I’m about to start on another big project with Swift on Android and would like 
to annotate that JNI headers as much as possible before I do: specifically I’d 
like to make _Nonnull and CF_SWIFT_NAME annotations to the headers found in a 
user's jni.h.

The question is: is it possible to annotate headers this without changing the 
original header files? Specifically I’m looking for an options that allows 
annotations in a separate file, probably one that is read when loading the 
package’s module.modulemap.

I’d like to distribute the annotations in a SwiftPM package that also exposes 
the original (hopefully annotated) headers. Up until now I’ve been using Swift 
to override methods in code, but this isn’t as clean or extensible and I fear 
it may have other (particularly performance) implications.

I guess the alternative would be to just maintain and distribute a modified 
version of jni.h with the annotations, but that would be a "last resort” option.

Thanks in advance,
Geordie

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