Abstract methods can also have bridges

backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/descriptors/ClassVtablesBuilder.kt

@@ -29,10 +29,7 @@ internal class OverriddenFunctionDescriptor(val descriptor: FunctionDescriptor,
     val overriddenDescriptor = overriddenDescriptor.original
 
     val needBridge: Boolean
-        get() {
-            if (descriptor.modality == Modality.ABSTRACT) return false
-            return descriptor.target.needBridgeTo(overriddenDescriptor)
-        }
+        get() = descriptor.target.needBridgeTo(overriddenDescriptor)
 
     val bridgeDirections: BridgeDirections
         get() = descriptor.target.bridgeDirectionsTo(overriddenDescriptor)
@@ -43,11 +40,9 @@ internal class OverriddenFunctionDescriptor(val descriptor: FunctionDescriptor,
                 || DescriptorUtils.getAllOverriddenDeclarations(overriddenDescriptor).any { it.isOverridable }
 
     val inheritsBridge: Boolean
-        get() {
-            return !descriptor.kind.isReal
-                    && OverridingUtil.overrides(descriptor.target, overriddenDescriptor)
-                    && descriptor.bridgeDirectionsTo(overriddenDescriptor).allNotNeeded()
-        }
+        get() = !descriptor.kind.isReal
+                && OverridingUtil.overrides(descriptor.target, overriddenDescriptor)
+                && descriptor.bridgeDirectionsTo(overriddenDescriptor).allNotNeeded()
 
     override fun toString(): String {
         return "(descriptor=$descriptor, overriddenDescriptor=$overriddenDescriptor)"

backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/descriptors/DescriptorUtils.kt

@@ -283,13 +283,11 @@ internal class BridgeDirections(val array: Array<BridgeDirection>) {
 
 internal fun FunctionDescriptor.bridgeDirectionsTo(overriddenDescriptor: FunctionDescriptor): BridgeDirections {
     val ourDirections = BridgeDirections(this.valueParameters.size)
-    if (modality == Modality.ABSTRACT)
-        return ourDirections
     for (index in ourDirections.array.indices)
         ourDirections.array[index] = this.bridgeDirectionToAt(overriddenDescriptor, index)
 
     val target = this.target
-    if (!kind.isReal
+    if (!kind.isReal && modality != Modality.ABSTRACT
             && OverridingUtil.overrides(target, overriddenDescriptor)
             && ourDirections == target.bridgeDirectionsTo(overriddenDescriptor)) {
         // Bridge is inherited from superclass.

backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/lower/BridgesBuilding.kt

@@ -93,8 +93,9 @@ internal class BridgesBuilding(val context: Context) : ClassLoweringPass {
 
         irClass.descriptor.contributedMethods.forEach { functions.add(it) }
 
-        functions.forEach {
-            it?.let { function ->
+        functions.filterNotNull()
+                .filterNot { it.modality == Modality.ABSTRACT }
+                .forEach { function ->
                 function.allOverriddenDescriptors
                         .map { OverriddenFunctionDescriptor(function, it) }
                         .filter { !it.bridgeDirections.allNotNeeded() }
@@ -104,7 +105,6 @@ internal class BridgesBuilding(val context: Context) : ClassLoweringPass {
                         .forEach {
                             buildBridge(it, irClass)
                         }
-            }
         }
     }