A More Reliable Compilation Scheme for Kotlin Multiplatform Modules - The JetBrains Blog
Blog post from JetBrains
Kotlin 2.5.0-Beta1 introduces an experimental, opt-in separate compilation mode for Kotlin Multiplatform projects that aims to align compiler behavior with IntelliJ IDEA analysis and make common code dependencies more predictable. Under the existing approach, common source sets can be compiled against platform-specific dependency artifacts, allowing calls to platform declarations that the IDE flags as unresolved, selecting different overloads than the IDE expects, and causing platform-specific type-inference failures. Separate compilation instead resolves common source sets strictly against common metadata KLIB declarations, requiring explicit expect/actual relationships for platform functionality while preventing accidental platform calls from commonMain or commonTest. This approach also creates a foundation for incremental compilation of common source sets. It can be enabled through the kotlin.kmp.separateCompilation=true Gradle property, but remains experimental, depends on libraries publishing metadata KLIBs, and has known limitations involving C interoperability, certain smaller issues, and modules with common source sets that declare only one target.
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