// tag::swift-dependency-mgmt[]
application {
    dependencies {
        implementation(project(":common"))
    }
}
// end::swift-dependency-mgmt[]

// tag::swift-compiler-options-all-variants[]
tasks.withType(SwiftCompile::class.java).configureEach {
    // Define a preprocessor macro for every binary
    macros.add("NDEBUG")

    // Define a compiler options
    compilerArgs.add("-O")
}
// end::swift-compiler-options-all-variants[]

import org.gradle.internal.os.OperatingSystem
import org.gradle.language.swift.plugins.SwiftApplicationPlugin
import org.gradle.language.swift.plugins.SwiftLibraryPlugin
import org.gradle.language.swift.tasks.SwiftCompile
import org.gradle.nativeplatform.tasks.InstallExecutable
import org.gradle.nativeplatform.tasks.LinkExecutable
import org.gradle.nativeplatform.tasks.LinkMachOBundle

    def setup() {
        // Useful for diagnosing swiftc incremental compile failures
        buildFile << """
            allprojects {
                tasks.withType(SwiftCompile) {
                    compilerArgs.add('-driver-show-incremental')
                }
            }
        """
    }

    def 'recompiles only the Swift source files that have changed'() {
        given:

// tag::swift-dependency-mgmt[]
application {
    dependencies {
        implementation project(':common')
    }
}
// end::swift-dependency-mgmt[]

// tag::swift-compiler-options-all-variants[]
tasks.withType(SwiftCompile).configureEach {
    // Define a preprocessor macro for every binary
    macros.add("NDEBUG")

    // Define a compiler options
    compilerArgs.add '-O'
}
// end::swift-compiler-options-all-variants[]

    {rank=same swiftCompileVariant implementation variantImplementation}
    swiftCompileVariant -> modules
    implementation -> modules
    variantImplementation -> modules

    swiftCompileVariant[style=dashed, label=<swiftCompile<i>Variant</i><br/>(configuration)>]
    implementation[style=dashed, label="implementation\n(configuration)"]
    variantImplementation[style=dashed, label=<main<i>Variant</i>Implementation<br/>(configuration)>]
  }

  }

  subgraph left {
    node[style=filled, fillcolor="#cfe2f3"]
    swiftCompileVariant -> nativeLinkVariant -> nativeRuntimeVariant [style=invis, weight=1000]

    swiftCompileVariant[label=<swiftCompile<i>Variant</i> (R)>]
    nativeLinkVariant[label=<nativeLink<i>Variant</i> (R)>]
    nativeRuntimeVariant[label=<nativeRuntime<i>Variant</i> (R)>]
  }

  subgraph right {
    node[style=filled, fillcolor="#ea9999"]

import org.gradle.language.swift.internal.DefaultSwiftBinary
import org.gradle.language.swift.internal.DefaultSwiftExecutable
import org.gradle.language.swift.internal.DefaultSwiftSharedLibrary
import org.gradle.language.swift.tasks.SwiftCompile
import org.gradle.nativeplatform.TargetMachine
import org.gradle.nativeplatform.platform.internal.DefaultOperatingSystem
import org.gradle.nativeplatform.tasks.InstallExecutable

  }

  subgraph left {
    node[style=filled, fillcolor="#cfe2f3"]
    swiftCompileVariant -> nativeLinkVariant -> nativeRuntimeVariant [style=invis, weight=1000]

    swiftCompileVariant[label=<swiftCompile<i>Variant</i> (R)>]
    nativeLinkVariant[label=<nativeLink<i>Variant</i> (R)>]
    nativeRuntimeVariant[label=<nativeRuntime<i>Variant</i> (R)>]
  }

  subgraph right {
    node[style=filled, fillcolor="#ea9999"]

There are several options for customization, as you’ll see next.

NOTE: All link:{groovyDslPath}/org.gradle.language.swift.tasks.SwiftCompile.html[SwiftCompile] tasks are incremental and cacheable.

[[sec:swift_supported_tool_chain]]
=== Supported tool chain

Gradle support the https://swift.org/download/[official Swift tool chain for macOS and Linux].

import org.gradle.language.swift.internal.DefaultSwiftBinary;
import org.gradle.language.swift.internal.DefaultSwiftPlatform;
import org.gradle.language.swift.plugins.SwiftBasePlugin;
import org.gradle.language.swift.tasks.SwiftCompile;
import org.gradle.model.internal.registry.ModelRegistry;
import org.gradle.nativeplatform.TargetMachine;
import org.gradle.nativeplatform.TargetMachineFactory;