Merge pull request #3216 from davotoula/fix/ios-test-uikit-prebuilt-cache

Restore iOS test native-cache workaround dropped in dependency bump

commons/build.gradle.kts

@@ -1,5 +1,23 @@
 
 import org.jetbrains.kotlin.gradle.dsl.JvmTarget
+import org.jetbrains.kotlin.gradle.plugin.mpp.DisableCacheInKotlinVersion
+import org.jetbrains.kotlin.gradle.plugin.mpp.KotlinNativeCacheApi
+import org.jetbrains.kotlin.gradle.plugin.mpp.KotlinNativeTarget
+import org.jetbrains.kotlin.gradle.plugin.mpp.TestExecutable
+
+// Disables the Kotlin/Native compiler cache for an iOS test binary so the
+// Compose ui-uikit klib recompiles fresh instead of linking the broken prebuilt
+// cache (see the call site in the `kotlin {}` block). The version guard makes
+// Kotlin re-surface this workaround once we move past 2.4.0, so it can be
+// dropped when a newer Compose/Kotlin pairing fixes the cache. Wrapped in a
+// helper because @OptIn only applies to declarations, not bare statements.
+@OptIn(KotlinNativeCacheApi::class)
+fun TestExecutable.disableUiKitPrebuiltCache() =
+    disableNativeCache(
+        DisableCacheInKotlinVersion.`2_4_0`,
+        "Compose ui-uikit prebuilt cache references UIViewLayoutRegion (iOS 17+); " +
+            "linking the iOS test binary fails under Xcode 16.4.",
+    )
 
 plugins {
     alias(libs.plugins.kotlinMultiplatform)
@@ -50,6 +68,22 @@ kotlin {
     iosArm64()
     iosSimulatorArm64()
 
+    // Compose Multiplatform 1.11.x ships an `org.jetbrains.compose.ui:ui-uikit`
+    // prebuilt Kotlin/Native cache whose CMPLayoutRegion object hard-references
+    // the UIKit class `UIViewLayoutRegion` (introduced in iOS 17). Linking the
+    // iOS *test* executable against that cache under Xcode 16.4 fails with
+    //   ld: Undefined symbols: _OBJC_CLASS_$_UIViewLayoutRegion
+    // because the cached object was built for a newer simulator SDK (18.5) than
+    // the test binary is being linked for (14.0). Disabling the native cache for
+    // the iOS test binaries makes ui-uikit recompile against the active SDK,
+    // where the symbol resolves. See disableUiKitPrebuiltCache() above and
+    // https://kotl.in/disable-native-cache
+    targets.withType<KotlinNativeTarget>().configureEach {
+        binaries.withType<TestExecutable>().configureEach {
+            disableUiKitPrebuiltCache()
+        }
+    }
+
     sourceSets {
         commonMain {
             dependencies {