GCC_COMPATIBLE,
    // Any available Clang
    CLANG,
    // Any Swift compiler
    SWIFTC,
    // Any Swift 3.x compiler
    SWIFTC_3,
    // Any Swift 4.x compiler
    SWIFTC_4,
    // Any available Swift compiler <= 4
    SWIFTC_4_OR_OLDER,
    // Any Swift 5.x compiler
    SWIFTC_5,
    // Supports building 32-bit binaries
    SUPPORTS_32,

import static org.junit.Assume.assumeTrue

@RequiresInstalledToolChain(ToolChainRequirement.SWIFTC)
class AbstractSwiftMixedLanguageIntegrationTest extends AbstractIntegrationSpec {
    public static final String SHARED = "SHARED"
    public static final String STATIC = "STATIC"
    def swiftToolChain = AvailableToolChains.getToolChain(ToolChainRequirement.SWIFTC)
    def cppToolChain = AvailableToolChains.getToolChain(ToolChainRequirement.CLANG)

 */

package org.gradle.language.swift


import org.gradle.nativeplatform.fixtures.RequiresInstalledToolChain
import org.gradle.nativeplatform.fixtures.ToolChainRequirement
import org.gradle.nativeplatform.fixtures.app.SourceElement
import org.gradle.nativeplatform.fixtures.app.Swift3
import org.gradle.nativeplatform.fixtures.app.Swift4
import org.gradle.nativeplatform.fixtures.app.Swift5
import org.gradle.util.Matchers

 */

package org.gradle.language.swift


import org.gradle.language.AbstractNativeParallelIntegrationTest
import org.gradle.nativeplatform.fixtures.RequiresInstalledToolChain
import org.gradle.nativeplatform.fixtures.ToolChainRequirement
import org.gradle.nativeplatform.fixtures.app.SwiftApp

@RequiresInstalledToolChain(ToolChainRequirement.SWIFTC)

    protected void makeTestSuiteAndComponentWithLibrary() {
        buildFile << """
            apply plugin: 'xctest'
            apply plugin: 'swift-application'
            project(':lib') {
                apply plugin: 'swift-library'
            }
"""
        file("src/main/swift/App.swift") << """
            import Lib

            class App {
                var util = Util()
            }
"""

import org.junit.Assume

@RequiresInstalledToolChain(ToolChainRequirement.SWIFTC)
abstract class AbstractSwiftXCTestIntegrationTest extends AbstractNativeUnitTestIntegrationTest implements XCTestExecutionResult, SwiftTaskNames {
    def setup() {
        // TODO: Temporarily disable XCTests with Swift3 on macOS
        Assume.assumeFalse(OperatingSystem.current().isMacOsX() && toolChain.version.major == 3)
    }

            project(':lib') {
                apply plugin: 'swift-library'
            }
"""
        file("src/test/swift/Test.swift") << """
            import Lib
            import XCTest

            class Test {
                var util = Util()
            }
"""
        file("lib/src/main/swift/Util.swift") << """
            public class Util {
                public init() { }
            }

        failure.assertHasCause("Swift compiler version '${toolChain.version}' doesn't support Swift language version '${SwiftVersion.SWIFT4.version}'")
    }

    @RequiresInstalledToolChain(ToolChainRequirement.SWIFTC_3)
    def "throws exception with meaningful message when building Swift 5 source code on Swift 3 compiler"() {
        given:
        makeSingleProject()

        final SourceFile sourceFile = new SourceFile("swift", "main.swift", 'print("goodbye world!")')
    }

    @Override
    protected SourceFileElement getOtherFile() {
        return new SourceFileElement() {
            final SourceFile sourceFile = new SourceFile("swift", "other.swift", 'class Other {}')
        }
    }

    @Override

 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.gradle.nativeplatform.toolchain;

import org.gradle.api.Incubating;

/**
 * Swiftc specific settings for the tools used to build for a particular platform.
 *
 * @since 4.1
 */
@Incubating
public interface SwiftcPlatformToolChain extends NativePlatformToolChain {
    /**