Remove the Eclipse CDT stuff from the build and tests on Java 11. We can remove this complexity if we remove support for Java 11 (see #2375)

Author: nedtwigg

lib-extra/build.gradle

@@ -50,6 +50,9 @@ def NEEDS_P2_DEPS = [
 	'groovy',
 	'jdt'
 ]
+if (!JavaVersion.current().isCompatibleWith(JavaVersion.VERSION_17)) {
+	NEEDS_P2_DEPS.remove('cdt')
+}
 for (needsP2 in NEEDS_P2_DEPS) {
 	sourceSets.register(needsP2) {
 		compileClasspath += sourceSets.main.output
@@ -74,11 +77,12 @@ tasks.withType(Test).configureEach {
 
 apply plugin: 'dev.equo.p2deps'
 p2deps {
-	// (alphabetic order please)
-	into 'cdtCompileOnly', {
-		p2repo 'https://download.eclipse.org/eclipse/updates/4.26/'
-		p2repo 'https://download.eclipse.org/tools/cdt/releases/11.0/'
-		install 'org.eclipse.cdt.core'
+	if (JavaVersion.current().isCompatibleWith(JavaVersion.VERSION_17)) {
+		into 'cdtCompileOnly', {
+			p2repo 'https://download.eclipse.org/eclipse/updates/4.26/'
+			p2repo 'https://download.eclipse.org/tools/cdt/releases/11.0/'
+			install 'org.eclipse.cdt.core'
+		}
 	}
 	into 'groovyCompileOnly', {
 		p2repo 'https://download.eclipse.org/eclipse/updates/4.26/'

lib-extra/src/main/java/com/diffplug/spotless/extra/cpp/EclipseCdtFormatterStep.java

@@ -38,7 +38,7 @@ public final class EclipseCdtFormatterStep {
 	private EclipseCdtFormatterStep() {}
 
 	private static final String NAME = "eclipse cdt formatter";
-	private static final Jvm.Support<String> JVM_SUPPORT = Jvm.<String> support(NAME).add(11, "11.0").add(17, "11.6");
+	private static final Jvm.Support<String> JVM_SUPPORT = Jvm.<String> support(NAME).add(17, "11.6");
 
 	public static String defaultVersion() {
 		return JVM_SUPPORT.getRecommendedFormatterVersion();

lib-extra/src/test/java/com/diffplug/spotless/extra/cpp/EclipseCdtFormatterStepTest.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2024 DiffPlug
+ * Copyright 2016-2025 DiffPlug
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -15,8 +15,11 @@
  */
 package com.diffplug.spotless.extra.cpp;
 
+import static org.junit.jupiter.api.condition.JRE.JAVA_17;
+
 import java.util.stream.Stream;
 
+import org.junit.jupiter.api.condition.EnabledForJreRange;
 import org.junit.jupiter.params.ParameterizedTest;
 import org.junit.jupiter.params.provider.MethodSource;
 
@@ -30,13 +33,14 @@ public EclipseCdtFormatterStepTest() {
 
 	@ParameterizedTest
 	@MethodSource
+	@EnabledForJreRange(min = JAVA_17)
 	void formatWithVersion(String version) throws Exception {
 		harnessFor(version).test("main.c",
 				"#include <a.h>;\nint main(int argc,   \nchar *argv[]) {}",
 				"#include <a.h>;\nint main(int argc, char *argv[]) {\n}\n");
 	}
 
 	private static Stream<String> formatWithVersion() {
-		return Stream.of("10.6", "10.7", EclipseCdtFormatterStep.defaultVersion());
+		return Stream.of("11.0", "11.6", EclipseCdtFormatterStep.defaultVersion());
 	}
 }