Looks like the clion team made progress with gradle: https://blog.jetbrains.com/clion/2018/05/clion-starts-2018-2-eap-sanitizers-gradle-db-performance/#gradle_cpp_projects #hype!! 😄

Correct, this is a prerequisite for supporting Kotlin/Native gradle projects. This one is not finished yet, but it's coming.

What is the recommanded workaround to develop a Kotlin/Native project with Gradle build and autocomplete? Use double build infra like CMake for CLion and the equivalent Gradle build for command line builds?

Either that, or take a look at the plugin for AppCode. It uses gradle for building, but the source files have to be added to the wrapping Xcode project as well.

Thanks