[FE] Add ability to set compatibility of plugin with K2 in ComponentRegistrar

compiler/cli/src/org/jetbrains/kotlin/cli/jvm/compiler/FirKotlinToJvmBytecodeCompiler.kt

@@ -87,13 +87,17 @@ object FirKotlinToJvmBytecodeCompiler {
         )
 
         projectConfiguration.get(ComponentRegistrar.PLUGIN_COMPONENT_REGISTRARS)?.let { pluginComponentRegistrars ->
-            val nonScriptPlugins = pluginComponentRegistrars.filter {
-                it::class.java.canonicalName != CLICompiler.SCRIPT_PLUGIN_REGISTRAR_NAME
+            val notSupportedPlugins = pluginComponentRegistrars.filter {
+                !it.supportsK2 || it::class.java.canonicalName != CLICompiler.SCRIPT_PLUGIN_REGISTRAR_NAME
             }
-            if (nonScriptPlugins.isNotEmpty()) {
+            if (notSupportedPlugins.isNotEmpty()) {
                 messageCollector.report(
                     CompilerMessageSeverity.ERROR,
-                    "Compiler plugins are enabled with K2 compiler.\n K2 does not support plugins yet, so please remove -Xuse-k2 flag"
+                    """
+                        |There are some plugins incompatible with K2 compiler:
+                        |${notSupportedPlugins.joinToString(separator = "\n|") { "  ${it::class.qualifiedName}" }}
+                        |Please remove -Xuse-k2
+                    """.trimMargin()
                 )
                 return false
             }

compiler/plugin-api/src/org/jetbrains/kotlin/compiler/plugin/ComponentRegistrar.kt

@@ -26,4 +26,7 @@ interface ComponentRegistrar {
     }
 
     fun registerProjectComponents(project: MockProject, configuration: CompilerConfiguration)
+
+    val supportsK2: Boolean
+        get() = false
 }

compiler/testData/cli/jvm/pluginWithK2Error.out

@@ -1,6 +1,7 @@
 warning: ATTENTION!
  This build uses experimental K2 compiler:
   -Xuse-k2
-error: compiler plugins are enabled with K2 compiler.
- K2 does not support plugins yet, so please remove -Xuse-k2 flag
+error: there are some plugins incompatible with K2 compiler:
+  org.jetbrains.kotlin.android.synthetic.AndroidComponentRegistrar
+Please remove -Xuse-k2
 COMPILATION_ERROR

plugins/scripting/scripting-compiler/src/org/jetbrains/kotlin/scripting/compiler/plugin/pluginRegisrar.kt

@@ -43,6 +43,11 @@ private fun <T : Any> ProjectExtensionDescriptor<T>.registerExtensionIfRequired(
 }
 
 class ScriptingCompilerConfigurationComponentRegistrar : ComponentRegistrar {
+    // Actually this plugin don't support K2, but it automatically registered in some cases,
+    //   so for now this flag is just a stub
+    override val supportsK2: Boolean
+        get() = true
+
     override fun registerProjectComponents(project: MockProject, configuration: CompilerConfiguration) {
         val messageCollector = configuration.get(CLIConfigurationKeys.MESSAGE_COLLECTOR_KEY)
         val hostConfiguration = ScriptingHostConfiguration(defaultJvmScriptingHostConfiguration) {
@@ -84,4 +89,4 @@ private inline fun withClassloadingProblemsReporting(messageCollector: MessageCo
             System.err.println(msg)
         }
     }
-}
+}