I'm trying to create a SPM from a module using the...

# multiplatform

[lilypuchi]

I'm trying to create a SPM from a module using the multiplatform-swiftpackage plugin. The module contains a simple object file.

object Strings {
    val TitleTalks = "Talks"
    val TabTalks = "Talks"
    val TabChannels = "Channel"
    val TabProfile = "Profile"
}

complete build.gradle looks like this

plugins {
    kotlin("multiplatform")
    id("com.android.library")
    id("com.chromaticnoise.multiplatform-swiftpackage") version "2.0.3"
}

kotlin {
    multiplatformSwiftPackage {
        swiftToolsVersion("5.3")
        targetPlatforms {
            iOS { v("13") }
        }
        packageName("AppStrings")
        outputDirectory(File(projectDir, "spm/strings"))
    }

    android()

    ios {
        binaries {
            framework {
                baseName = "strings"
                isStatic = false
            }
        }
    }

    iosSimulatorArm64 {
        binaries {
            framework {
                baseName = "strings"
                isStatic = false
            }
        }
    }

    sourceSets {
        val commonMain by getting {
            dependencies {
                implementation(libs.moko.resources.core)
            }
        }
        val commonTest by getting {
            dependencies {
                implementation(kotlin("test"))
            }
        }
        val androidMain by getting {
            dependencies {
                implementation(libs.moko.resources.compose)
            }
        }
        val androidTest by getting

        val iosMain by getting
        val iosTest by getting
        val iosSimulatorArm64Main by getting {
            dependsOn(iosMain)
        }
        val iosSimulatorArm64Test by getting {
            dependsOn(iosTest)
        }
    }
}

android {..}

But I always get the following build error whenever I try accessing Strings.xx inside my Swift file

Undefined symbols for architecture arm64:
  "_OBJC_CLASS_$_StringsStrings", referenced from:
      objc-class-ref in ContentView.o
ld: symbol(s) not found for architecture arm64

Any sort of hint will be of great help blob smile

[xxfast]

You are missing the iosArm64() target

[xxfast]

You'll need something like

kotlin {
  ..
  listOf(
    iosX64(),
    iosArm64(),
    iosSimulatorArm64(),
  ).forEach { target ->
    with(target) {
      binaries {
        framework {
          baseName = "strings"
          isStatic = false
        }
      }
    }
  }
  ..
  sourceSets {
    ..
    val iosX64Main by getting
    val iosArm64Main by getting
    val iosSimulatorArm64Main by getting
    val iosMain by creating {
      dependsOn(commonMain)
      iosX64Main.dependsOn(this)
      iosArm64Main.dependsOn(this)
      iosSimulatorArm64Main.dependsOn(this)
      dependencies {
        implementation(Ktor.clientIos)
        implementation(Square.sqlDelightNativeDriver)
      }
    }
    ..
  }
}

[lilypuchi]

I thought ios contains iosArm64() already. 🤔

fun ios(
        namePrefix: String = "ios",
        configure: KotlinNativeTarget.() -> Unit = {}
    ) {
        val targets = listOf(
            iosArm64("${namePrefix}Arm64"),
            iosX64("${namePrefix}X64")
        )
        createIntermediateSourceSets(namePrefix, targets.defaultSourceSets(), mostCommonSourceSets())
        targets.forEach { it.configure() }
    }

[xxfast]

hmm yeah you are right, it does seem to include both iosArm64 and iosX64, must be something else causing the issue

[xxfast]

out of curiosity - would explicitly defining each target (like above) still cause the issue?

[lilypuchi]

Yup just tried it out. The issue still persists. I’m curious if it has to do anything with the SPM library itself. Because even a simple Kotlin object module seems to be failing 🤔

[xxfast]

Are you able to extract this down to a minimal project?

[lilypuchi]

It compiles successfully to a SPM package. But upon including it in Xcode and trying to build it it fails.

[xxfast]

seems like a spm-plugin issue - better to raise a ticket in the plugin repo

[xxfast]

do you use cocopods? any issues through the cocopods plugin?

[Sebastian Muggelberg]

Are you compiling on an Intel Mac or an M1 Mac?
Can you show a Screenshot of your .xcframework folder?
Can you show your build settings for “Architecture”?

[Sebastian Muggelberg]

The ios-x86_64-simulator will not work on M1 Macs. You need ios-arm64_x86_64-simulator to make it work in the simulator.

[lilypuchi]

Oh is it .. any changes to the build settings I have to make then?

[Sebastian Muggelberg]

Something is wrong in your build.gradle but I can not help you with this cause I am from the iOS universe and have no Idea about the build.gradle things 🤫

[lilypuchi]

Not an issue! Thanks a lot for identifying out the M1 mac issue 👍