make it possible to move SchemeBuilder with zz_generated.deepcopy.go

cmd/kubeadm/app/apis/kubeadm/v1alpha1/register.go

@@ -29,10 +29,20 @@ const GroupName = "kubeadm.k8s.io"
 var SchemeGroupVersion = schema.GroupVersion{Group: GroupName, Version: "v1alpha1"}
 
 var (
-	SchemeBuilder = runtime.NewSchemeBuilder(addKnownTypes, addDefaultingFuncs)
-	AddToScheme   = SchemeBuilder.AddToScheme
+	// TODO: move SchemeBuilder with zz_generated.deepcopy.go to k8s.io/api.
+	// localSchemeBuilder and AddToScheme will stay in k8s.io/kubernetes.
+	SchemeBuilder      runtime.SchemeBuilder
+	localSchemeBuilder = &SchemeBuilder
+	AddToScheme        = localSchemeBuilder.AddToScheme
 )
 
+func init() {
+	// We only register manually written functions here. The registration of the
+	// generated functions takes place in the generated files. The separation
+	// makes the code compile even when the generated files are missing.
+	localSchemeBuilder.Register(addKnownTypes, addDefaultingFuncs)
+}
+
 // Kind takes an unqualified kind and returns a Group qualified GroupKind
 func Kind(kind string) schema.GroupKind {
 	return SchemeGroupVersion.WithKind(kind).GroupKind()

cmd/libs/go2idl/client-gen/test_apis/testgroup/v1/register.go

@@ -25,10 +25,20 @@ import (
 var SchemeGroupVersion = schema.GroupVersion{Group: "testgroup.k8s.io", Version: "v1"}
 
 var (
-	SchemeBuilder = runtime.NewSchemeBuilder(addKnownTypes)
-	AddToScheme   = SchemeBuilder.AddToScheme
+	// TODO: move SchemeBuilder with zz_generated.deepcopy.go to k8s.io/api.
+	// localSchemeBuilder and AddToScheme will stay in k8s.io/kubernetes.
+	SchemeBuilder      runtime.SchemeBuilder
+	localSchemeBuilder = &SchemeBuilder
+	AddToScheme        = localSchemeBuilder.AddToScheme
 )
 
+func init() {
+	// We only register manually written functions here. The registration of the
+	// generated functions takes place in the generated files. The separation
+	// makes the code compile even when the generated files are missing.
+	localSchemeBuilder.Register(addKnownTypes)
+}
+
 // Adds the list of known types to api.Scheme.
 func addKnownTypes(scheme *runtime.Scheme) error {
 	scheme.AddKnownTypes(SchemeGroupVersion,