Test disabling cross compile

Author: lauzadis

.github/workflows/ci.yml

@@ -67,7 +67,7 @@ jobs:
           # FIXME K2. Re-enable warnings as errors after this warning is removed: https://youtrack.jetbrains.com/issue/KT-68532
           # echo "kotlinWarningsAsErrors=true" >> $GITHUB_WORKSPACE/local.properties              
           ./gradlew apiCheck
-          ./gradlew -Paws.sdk.kotlin.crt.disableCrossCompile=true build
+          ./gradlew -Paws.sdk.kotlin.crt.disableCrossCompile=true -Paws.kotlin.native.disableCrossCompile=true build
 
       - name: Save Test Reports
         if: failure()
@@ -126,7 +126,7 @@ jobs:
         working-directory: ./smithy-kotlin
         run: |
           ./gradlew apiCheck
-          ./gradlew -P"aws.sdk.kotlin.crt.disableCrossCompile"=true build
+          ./gradlew -P"aws.sdk.kotlin.crt.disableCrossCompile"=true -P"aws.kotlin.native.disableCrossCompile"=true build
 
       - name: Save Test Reports
         if: failure()

build.gradle.kts

@@ -5,6 +5,11 @@
 import aws.sdk.kotlin.gradle.dsl.configureLinting
 import aws.sdk.kotlin.gradle.dsl.configureNexus
 import aws.sdk.kotlin.gradle.util.typedProp
+import org.jetbrains.kotlin.gradle.dsl.KotlinMultiplatformExtension
+import org.jetbrains.kotlin.gradle.plugin.mpp.KotlinNativeTarget
+import org.jetbrains.kotlin.konan.target.Family
+import org.jetbrains.kotlin.konan.target.HostManager
+import kotlin.apply
 
 buildscript {
     // NOTE: buildscript classpath for the root project is the parent classloader for the subprojects, we
@@ -154,3 +159,67 @@ apiValidation {
         ),
     )
 }
+
+val disableCrossCompile = typedProp<Boolean>("aws.kotlin.native.disableCrossCompile") == true
+
+if (disableCrossCompile) {
+    logger.warn("aws.kotlin.native.disableCrossCompile=true: Cross compilation is disabled.")
+    disableCrossCompileTargets()
+}
+
+private val KotlinNativeTarget.isLinux: Boolean
+    get() = konanTarget.family == Family.LINUX
+
+private val KotlinNativeTarget.isApple: Boolean
+    get() = konanTarget.family.isAppleFamily
+
+private val KotlinNativeTarget.isWindows: Boolean
+    get() = konanTarget.family == Family.MINGW
+
+/**
+ * Kotlin/Native Linux and Windows targets are generally enabled on all hosts since
+ * the Kotlin toolchain and backend compilers support cross compilation. We
+ * are using cinterop and have to compile CRT for those platforms which sometimes
+ * requires using docker which isn't always available in CI or setup in users environment.
+ *
+ * See [KT-30498](https://youtrack.jetbrains.com/issue/KT-30498)
+ */
+fun Project.disableCrossCompileTargets() {
+    plugins.withId("org.jetbrains.kotlin.multiplatform") {
+        configure<KotlinMultiplatformExtension> {
+            targets.withType<KotlinNativeTarget> {
+                val knTarget = this
+                when {
+                    HostManager.hostIsMac && (knTarget.isLinux || knTarget.isWindows) -> disable(knTarget)
+                    HostManager.hostIsLinux && knTarget.isApple -> disable(knTarget)
+                    HostManager.hostIsMingw && (knTarget.isLinux || knTarget.isApple) -> disable(knTarget)
+                }
+            }
+        }
+    }
+}
+
+internal fun Project.disable(knTarget: KotlinNativeTarget) {
+    logger.warn("disabling Kotlin/Native target: ${knTarget.name}")
+    knTarget.apply {
+        compilations.all {
+            cinterops.all {
+                tasks.named(interopProcessingTaskName).configure { enabled = false }
+            }
+            compileTaskProvider.configure { enabled = false }
+        }
+
+        binaries.all {
+            linkTaskProvider.configure { enabled = false }
+        }
+
+        mavenPublication {
+            tasks.withType<AbstractPublishToMaven>().configureEach {
+                onlyIf { publication != this@mavenPublication }
+            }
+            tasks.withType<GenerateModuleMetadata>().configureEach {
+                onlyIf { publication != this@mavenPublication }
+            }
+        }
+    }
+}