import org.gradle.api.internal.tasks.compile.incremental.processing.AnnotationProcessorResult
import spock.lang.Specification

import javax.annotation.processing.ProcessingEnvironment
import javax.annotation.processing.Processor

import static org.gradle.api.internal.tasks.compile.incremental.processing.IncrementalAnnotationProcessorType.AGGREGATING

upgradeNotes:
  - title: Delta xDS on by default
    content: |
      In previous versions, Istio used the "State of the world" xDS protocol to configure Envoy.
      In this release, the ["Delta"](https://www.envoyproxy.io/docs/envoy/latest/api-docs/xds_protocol#incremental-xds) xDS protocol is enabled by default.

</div>
++++

Gradle uses two main features to reduce build time: *incremental builds* and *build caching*.

image::gradle-basic-8.png[]

== Incremental builds

An *incremental build* is a build that avoids running tasks whose inputs have not changed since the previous build.
Re-executing such tasks is unnecessary if they would only re-produce the same output.

For incremental builds to work, tasks must define their inputs and outputs.

 * limitations under the License.
 */

package org.gradle.api.internal.tasks.compile.incremental.recomp;

import org.gradle.api.internal.tasks.compile.incremental.compilerapi.deps.DependentsSet;
import org.gradle.api.internal.tasks.compile.incremental.deps.ClassSetAnalysis;

import javax.annotation.Nullable;
import java.util.Set;
import java.util.function.Function;

 */

package org.gradle.language.nativeplatform.internal.incremental

import org.gradle.language.nativeplatform.internal.Include
import org.gradle.language.nativeplatform.internal.IncludeDirectives
import org.gradle.language.nativeplatform.internal.incremental.sourceparser.CSourceParser
import org.gradle.language.nativeplatform.internal.incremental.sourceparser.TestIncludeParser
import spock.lang.Specification

 */

package org.gradle.api.internal.tasks.compile.incremental.recomp;

import org.gradle.api.internal.cache.StringInterner;
import org.gradle.api.internal.tasks.compile.incremental.compilerapi.CompilerApiData;
import org.gradle.api.internal.tasks.compile.incremental.deps.ClassSetAnalysisData;
import org.gradle.api.internal.tasks.compile.incremental.processing.AnnotationProcessingData;

    }

    def "the user is informed about non-incremental processors"() {
        def a = java "@Thing class A {}"

        when:
        run "compileJava"
        a.text = "@Thing class A { public void foo() {} }"
        run "compileJava", "--info"

        then:
        output.contains("Full recompilation is required because ThingProcessor is not incremental.")

     * but for the CLI compiler where incremental compilation after failure is not supported.
     */
    def "does full recompilation after a failure even if incrementalAfterFailure is set to true"() {
        given:
        buildFile << """
        tasks.withType(JavaCompile) {
            options.incremental = true

 * limitations under the License.
 */

package org.gradle.api.internal.tasks.compile.processing;

import org.gradle.api.internal.tasks.compile.incremental.processing.AnnotationProcessorResult;
import org.gradle.api.internal.tasks.compile.incremental.processing.IncrementalAnnotationProcessorType;

import javax.annotation.processing.ProcessingEnvironment;
import javax.annotation.processing.Processor;

    }

    def "does not recompile when only compileOptions.incremental property changes from #from to #to"() {
        given:
        libraryAppProjectWithIncrementalCompilation(language)

        when:
        buildFile << """
            subprojects {
                tasks.${language.compileTaskName}.options.incremental = $from
            }
        """
        run getAppCompileTask(language)