Hi. I have a KMM project which uses cinterop. When...

# multiplatform

[Kieren Searle]

Hi. I have a KMM project which uses cinterop. When I build/run from Android Studio or XCode I get "unresolved reference" errors for all the cinterop calls. I've figured out the issue is because the .klib files are not generated for some reason when deploying from the IDE.

The task that's failing is compileKotlinIosSimulatorArm64 (or equivalent for whatever platform I'm targeting). Strangely if I run with --scan the .klib files are generated and everything works perfectly!

Doing a ./gradlew build works great too.

Once I trigger a work-around I can run from the IDE. It's just when running a clean build from the IDE that I have the issue.

Any ideas what might be causing the issue?

[Kieren Searle]

listOf(
    iosX64(),
    iosArm64(),
    iosSimulatorArm64()
).forEach { target ->
    target.apply {
        compilations.getByName("main") {
            cinterops {
                val libmylib by cinterops.creating {
                    defFile(project.file("src/commonMain/cpp/ios/libmylib.def"))
                    packageName("libmylib")
                }
            }
        }

        binaries {
            framework {
                baseName = "shared"
                embedBitcode("disable")
            }
            staticLib()
        }
    }
}

[Kieren Searle]

package = libmylib

compilerOpts = -Ipath/to/headers/
headers = my_header.h

staticLibraries = mylib.a
libraryPaths = path/to.lib/

[Kieren Searle]

I'm thinking maybe there's gradle task I can use to force generate the klibs?

[Kieren Searle]

Just noticed:

> Task :compileKotlinIosSimulatorArm64 UP-TO-DATE

Looks like it thinks everything is built for some reason

[Kieren Searle]

This solves the issue, but increases my build time:

tasks.withType<org.jetbrains.kotlin.gradle.tasks.CInteropProcess> {
    outputs.upToDateWhen { false }
}

[Kieren Searle]

There's probably a better solution, but for now I've solved it by checking if the klib file is there. If it is I assume it's up to date and accept it, if it's not I build it

listOf(
	iosX64(),
    iosArm64(),
	iosSimulatorArm64()
).forEach { target ->
	target.apply {
		tasks.withType<org.jetbrains.kotlin.gradle.tasks.CInteropProcess> {          
			outputs.upToDateWhen {
				// Check if the klib file exists for this build. 
				// If it is then assume it's up to date.
				file(
					"build/classes/kotlin/${target.name}/main/cinterop/${this.outputFileName}"
				).exists()
			}
		}
	}
}