I'm writing bindings for 2 C libraries, `lib-alpha...

# kotlin-native

[Adam S]

I'm writing bindings for 2 C libraries, lib-alpha and lib-beta. To keep things separate, I've got two Gradle subprojects. lib-beta has #import lib-alpha.h, which means that CInterop generates duplicate classes.

For example, lib-alpha contains a Rectangle struct. lib-beta is supposed to use the same Rectangle, but because the CInterop bindings are generated in a separate subproject, the binding for the same Rectangle is duplicated, and so the Rectangle is incompatible.

Is there a way to tell the CInterop class to re-use an existing generated binding?

[Timofey Solonin]

If you first create CInterop klib from lib-alpha and pass this klib as a -library dependency to CInterop for lib-beta, then lib-beta will reuse the declarations from lib-alpha.klib instead of duplicating them.

[Adam S]

thanks, that sounds like what I want! It's tough figuring out how to do this with Gradle though, do you have an example?

[Timofey Solonin]

Something like this? Run with:

./gradlew :b:compileKotlinMA64

cinterop_between_projects.tar.gz

[Adam S]

thanks! I can see it working now

[Adam S]

I wonder why my project doesn't work though... I've got a similar set up, although it is more complicated

[Adam S]

maybe the include dir needs to be exactly the same? At the moment I copy the file into the two separate subprojects to try to prevent Gradle complaining about overlapping tasks

[Timofey Solonin]

the include dir needs to be exactly the same

This could be the reason, but most importantly you want the header files to be exactly the same.
In the example you could duplicate the include directory to be includeA and includeB with equal contents and the declaration reuse would still work. But as soon as you would add a newline to a.h in includeA the declaration reuse would stop working.

[Adam S]

ah thanks for checking, yes, the header files are the same

[Adam S]

I think actually it's working, but IntelliJ is very slow to recognise the generated bindings

[Adam S]

yesssss, got it working! Thanks for your help @Timofey Solonin!