Support swift package migrate with --build-system swiftbuild

Fixtures/SwiftMigrate/ExistentialAnyWithCommonPluginDependencyMigration/Package.swift

@@ -0,0 +1,13 @@
+// swift-tools-version:5.8
+
+import PackageDescription
+
+let package = Package(
+    name: "ExistentialAnyMigration",
+    targets: [
+        .target(name: "Library", dependencies: ["CommonLibrary"], plugins: [.plugin(name: "Plugin")]),
+        .plugin(name: "Plugin", capability: .buildTool, dependencies: ["Tool"]),
+        .executableTarget(name: "Tool", dependencies: ["CommonLibrary"]),
+        .target(name: "CommonLibrary"),
+    ]
+)

Fixtures/SwiftMigrate/ExistentialAnyWithCommonPluginDependencyMigration/Plugins/Plugin/Plugin.swift

@@ -0,0 +1,17 @@
+import PackagePlugin
+import Foundation
+
+@main struct Plugin: BuildToolPlugin {
+    func createBuildCommands(context: PluginContext, target: Target) throws -> [Command] {
+        let tool = try context.tool(named: "Tool")
+        let output = context.pluginWorkDirectory.appending(["generated.swift"])
+        return [
+            .buildCommand(
+                displayName: "Plugin",
+                executable: tool.path,
+                arguments: [output],
+                inputFiles: [],
+                outputFiles: [output])
+        ]
+    }
+}

Fixtures/SwiftMigrate/ExistentialAnyWithCommonPluginDependencyMigration/Sources/CommonLibrary/Common.swift

@@ -0,0 +1,6 @@
+public func common() {}
+
+
+protocol P {}
+
+func needsMigration(_ p: P) {}

Fixtures/SwiftMigrate/ExistentialAnyWithCommonPluginDependencyMigration/Sources/Library/Test.swift

@@ -0,0 +1,6 @@
+import CommonLibrary
+
+func bar() {
+    generatedFunction()
+    common()
+}

Fixtures/SwiftMigrate/ExistentialAnyWithCommonPluginDependencyMigration/Sources/Tool/tool.swift

@@ -0,0 +1,13 @@
+import Foundation
+import CommonLibrary
+
+@main struct Entry {
+    public static func main() async throws {
+        common()
+        let outputPath = CommandLine.arguments[1]
+        let contents = """
+        func generatedFunction() {}
+        """
+        FileManager.default.createFile(atPath: outputPath, contents: contents.data(using: .utf8))
+    }
+}

Fixtures/SwiftMigrate/ExistentialAnyWithPluginMigration/Package.swift

@@ -0,0 +1,12 @@
+// swift-tools-version:5.8
+
+import PackageDescription
+
+let package = Package(
+    name: "ExistentialAnyMigration",
+    targets: [
+        .target(name: "Library", plugins: [.plugin(name: "Plugin")]),
+        .plugin(name: "Plugin", capability: .buildTool, dependencies: ["Tool"]),
+        .executableTarget(name: "Tool"),
+    ]
+)

Fixtures/SwiftMigrate/ExistentialAnyWithPluginMigration/Plugins/Plugin/Plugin.swift

@@ -0,0 +1,17 @@
+import PackagePlugin
+import Foundation
+
+@main struct Plugin: BuildToolPlugin {
+    func createBuildCommands(context: PluginContext, target: Target) throws -> [Command] {
+        let tool = try context.tool(named: "Tool")
+        let output = context.pluginWorkDirectory.appending(["generated.swift"])
+        return [
+            .buildCommand(
+                displayName: "Plugin",
+                executable: tool.path,
+                arguments: [output],
+                inputFiles: [],
+                outputFiles: [output])
+        ]
+    }
+}

Fixtures/SwiftMigrate/ExistentialAnyWithPluginMigration/Sources/Library/Test.swift

@@ -0,0 +1,20 @@
+protocol P {
+}
+
+func test1(_: P) {
+}
+
+func test2(_: P.Protocol) {
+}
+
+func test3() {
+    let _: [P?] = []
+}
+
+func test4() {
+    var x = 42
+}
+
+func bar() {
+    generatedFunction()
+}

Fixtures/SwiftMigrate/ExistentialAnyWithPluginMigration/Sources/Tool/tool.swift

@@ -0,0 +1,12 @@
+import Foundation
+
+@main struct Entry {
+    public static func main() async throws {
+        let outputPath = CommandLine.arguments[1]
+        let contents = """
+        func generatedFunction() {}
+        func dontmodifyme(_: P) {}
+        """
+        FileManager.default.createFile(atPath: outputPath, contents: contents.data(using: .utf8))
+    }
+}

Sources/Build/BuildOperation.swift

@@ -396,9 +396,9 @@ public final class BuildOperation: PackageStructureDelegate, SPMBuildCore.BuildS
     }
 
     /// Perform a build using the given build description and subset.
-    public func build(subset: BuildSubset) async throws {
+    public func build(subset: BuildSubset) async throws -> BuildResult {
         guard !self.config.shouldSkipBuilding(for: .target) else {
-            return
+            return BuildResult(serializedDiagnosticPathsByTargetName: .failure(StringError("Building was skipped")))
         }
 
         let buildStartTime = DispatchTime.now()
@@ -422,7 +422,7 @@ public final class BuildOperation: PackageStructureDelegate, SPMBuildCore.BuildS
         // any errors up-front. Returns true if we should proceed with the build
         // or false if not. It will already have thrown any appropriate error.
         guard try await self.compilePlugins(in: subset) else {
-            return
+            return BuildResult(serializedDiagnosticPathsByTargetName: .failure(StringError("Plugin compilation failed")))
         }
 
         let configuration = self.config.configuration(for: .target)
@@ -452,6 +452,17 @@ public final class BuildOperation: PackageStructureDelegate, SPMBuildCore.BuildS
         )
         guard success else { throw Diagnostics.fatalError }
 
+        let serializedDiagnosticResult: Result<[String: [AbsolutePath]], Error>
+        var serializedDiagnosticPaths: [String: [AbsolutePath]] = [:]
+        do {
+            for module in try buildPlan.buildModules {
+                serializedDiagnosticPaths[module.module.name, default: []].append(contentsOf: module.diagnosticFiles)
+            }
+            serializedDiagnosticResult = .success(serializedDiagnosticPaths)
+        } catch {
+            serializedDiagnosticResult = .failure(error)
+        }
+
         // Create backwards-compatibility symlink to old build path.
         let oldBuildPath = self.config.dataPath(for: .target).parentDirectory.appending(
             component: configuration.dirname
@@ -463,7 +474,7 @@ public final class BuildOperation: PackageStructureDelegate, SPMBuildCore.BuildS
                     warning: "unable to delete \(oldBuildPath), skip creating symbolic link",
                     underlyingError: error
                 )
-                return
+                return BuildResult(serializedDiagnosticPathsByTargetName: serializedDiagnosticResult)
             }
         }
 
@@ -479,6 +490,8 @@ public final class BuildOperation: PackageStructureDelegate, SPMBuildCore.BuildS
                 underlyingError: error
             )
         }
+
+        return BuildResult(serializedDiagnosticPathsByTargetName: serializedDiagnosticResult)
     }
 
     /// Compiles any plugins specified or implied by the build subset, returning

Sources/Commands/PackageCommands/Migrate.swift

@@ -90,7 +90,7 @@ extension SwiftPackageCommand {
                 features.append(feature)
             }
 
-            let targets = self.options.targets
+            var targets = self.options.targets
 
             let buildSystem = try await createBuildSystem(
                 swiftCommandState,
@@ -100,49 +100,29 @@ extension SwiftPackageCommand {
 
             // Next, let's build all of the individual targets or the
             // whole project to get diagnostic files.
-
             print("> Starting the build")
+            var diagnosticsPaths: [String: [AbsolutePath]] = [:]
             if !targets.isEmpty {
                 for target in targets {
-                    try await buildSystem.build(subset: .target(target))
+                    let buildResult = try await buildSystem.build(subset: .target(target))
+                    diagnosticsPaths.merge(try buildResult.serializedDiagnosticPathsByTargetName.get(), uniquingKeysWith: { $0 + $1 })
                 }
             } else {
-                try await buildSystem.build(subset: .allIncludingTests)
+                diagnosticsPaths = try await buildSystem.build(subset: .allIncludingTests).serializedDiagnosticPathsByTargetName.get()
             }
 
-            // Determine all of the targets we need up update.
-            let buildPlan = try buildSystem.buildPlan
-
-            var modules: [any ModuleBuildDescription] = []
-            if !targets.isEmpty {
-                for buildDescription in buildPlan.buildModules
-                    where targets.contains(buildDescription.module.name) {
-                    modules.append(buildDescription)
-                }
-            } else {
-                let graph = try await buildSystem.getPackageGraph()
-                for buildDescription in buildPlan.buildModules
-                    where graph.isRootPackage(buildDescription.package)
-                {
-                    let module = buildDescription.module
-                    guard module.type != .plugin, !module.implicit else {
-                        continue
-                    }
-                    modules.append(buildDescription)
-                }
+            var summary = SwiftFixIt.Summary(numberOfFixItsApplied: 0, numberOfFilesChanged: 0)
+            let graph = try await buildSystem.getPackageGraph()
+            if targets.isEmpty {
+                targets = OrderedSet(graph.rootPackages.flatMap { $0.manifest.targets.filter { $0.type != .plugin }.map(\.name) })
             }
-
-            // If the build suceeded, let's extract all of the diagnostic
-            // files from build plan and feed them to the fix-it tool.
-
             print("> Applying fix-its")
-
-            var summary = SwiftFixIt.Summary(numberOfFixItsApplied: 0, numberOfFilesChanged: 0)
             let fixItDuration = try ContinuousClock().measure {
-                for module in modules {
+                for target in targets {
                     let fixit = try SwiftFixIt(
-                        diagnosticFiles: module.diagnosticFiles,
+                        diagnosticFiles: Array(diagnosticsPaths[target] ?? []),
                         categories: Set(features.flatMap(\.categories)),
+                        excludedSourceDirectories: [swiftCommandState.scratchDirectory],
                         fileSystem: swiftCommandState.fileSystem
                     )
                     summary += try fixit.applyFixIts()
@@ -176,10 +156,10 @@ extension SwiftPackageCommand {
             // manifest with newly adopted feature settings.
 
             print("> Updating manifest")
-            for module in modules.map(\.module) {
-                swiftCommandState.observabilityScope.emit(debug: "Adding feature(s) to '\(module.name)'")
+            for target in targets {
+                swiftCommandState.observabilityScope.emit(debug: "Adding feature(s) to '\(target)'")
                 try self.updateManifest(
-                    for: module.name,
+                    for: target,
                     add: features,
                     using: swiftCommandState
                 )

Sources/SPMBuildCore/BuildSystem/BuildSystem.swift

@@ -50,7 +50,8 @@ public protocol BuildSystem: Cancellable {
     /// Builds a subset of the package graph.
     /// - Parameters:
     ///   - subset: The subset of the package graph to build.
-    func build(subset: BuildSubset) async throws
+    @discardableResult
+    func build(subset: BuildSubset) async throws -> BuildResult
 
     var buildPlan: BuildPlan { get throws }
 
@@ -59,11 +60,20 @@ public protocol BuildSystem: Cancellable {
 
 extension BuildSystem {
     /// Builds the default subset: all targets excluding tests.
-    public func build() async throws {
+    @discardableResult
+    public func build() async throws -> BuildResult {
         try await build(subset: .allExcludingTests)
     }
 }
 
+public struct BuildResult {
+    package init(serializedDiagnosticPathsByTargetName: Result<[String: [AbsolutePath]], Error>) {
+        self.serializedDiagnosticPathsByTargetName = serializedDiagnosticPathsByTargetName
+    }
+
+    public var serializedDiagnosticPathsByTargetName: Result<[String: [AbsolutePath]], Error>
+}
+
 public protocol ProductBuildDescription {
     /// The reference to the product.
     var package: ResolvedPackage { get }

Sources/SwiftBuildSupport/SwiftBuildSystem.swift

@@ -41,20 +41,22 @@ struct SessionFailedError: Error {
     var diagnostics: [SwiftBuild.SwiftBuildMessage.DiagnosticInfo]
 }
 
-func withService(
+func withService<T>(
     connectionMode: SWBBuildServiceConnectionMode = .default,
     variant: SWBBuildServiceVariant = .default,
     serviceBundleURL: URL? = nil,
-    body: @escaping (_ service: SWBBuildService) async throws -> Void
-) async throws {
+    body: @escaping (_ service: SWBBuildService) async throws -> T
+) async throws -> T {
     let service = try await SWBBuildService(connectionMode: connectionMode, variant: variant, serviceBundleURL: serviceBundleURL)
+    let result: T
     do {
-        try await body(service)
+        result = try await body(service)
     } catch {
         await service.close()
         throw error
     }
     await service.close()
+    return result
 }
 
 public func createSession(
@@ -279,20 +281,20 @@ public final class SwiftBuildSystem: SPMBuildCore.BuildSystem {
         SwiftLanguageVersion.supportedSwiftLanguageVersions
     }
 
-    public func build(subset: BuildSubset) async throws {
+    public func build(subset: BuildSubset) async throws -> BuildResult {
         guard !buildParameters.shouldSkipBuilding else {
-            return
+            return BuildResult(serializedDiagnosticPathsByTargetName: .failure(StringError("Building was skipped")))
         }
 
         try await writePIF(buildParameters: buildParameters)
 
-        try await startSWBuildOperation(pifTargetName: subset.pifTargetName)
+        return try await startSWBuildOperation(pifTargetName: subset.pifTargetName)
     }
 
-    private func startSWBuildOperation(pifTargetName: String) async throws {
+    private func startSWBuildOperation(pifTargetName: String) async throws -> BuildResult {
         let buildStartTime = ContinuousClock.Instant.now
 
-        try await withService(connectionMode: .inProcessStatic(swiftbuildServiceEntryPoint)) { service in
+        return try await withService(connectionMode: .inProcessStatic(swiftbuildServiceEntryPoint)) { service in
             let derivedDataPath = self.buildParameters.dataPath
 
             let progressAnimation = ProgressAnimation.percent(
@@ -302,6 +304,7 @@ public final class SwiftBuildSystem: SPMBuildCore.BuildSystem {
                 isColorized: self.buildParameters.outputParameters.isColorized
             )
 
+            var serializedDiagnosticPathsByTargetName: [String: [Basics.AbsolutePath]] = [:]
             do {
                 try await withSession(service: service, name: self.buildParameters.pifManifest.pathString, toolchainPath: self.buildParameters.toolchain.toolchainDir, packageManagerResourcesDirectory: self.packageManagerResourcesDirectory) { session, _ in
                     self.outputStream.send("Building for \(self.buildParameters.configuration == .debug ? "debugging" : "production")...\n")
@@ -451,6 +454,11 @@ public final class SwiftBuildSystem: SPMBuildCore.BuildSystem {
                             }
                             let targetInfo = try buildState.target(for: startedInfo)
                             self.delegate?.buildSystem(self, didFinishCommand: BuildSystemCommand(startedInfo, targetInfo: targetInfo))
+                            if let targetName = targetInfo?.targetName {
+                                serializedDiagnosticPathsByTargetName[targetName, default: []].append(contentsOf: startedInfo.serializedDiagnosticsPaths.compactMap {
+                                    try? Basics.AbsolutePath(validating: $0.pathString)
+                                })
+                            }
                         case .targetStarted(let info):
                             try buildState.started(target: info)
                         case .planningOperationStarted, .planningOperationCompleted, .reportBuildDescription, .reportPathMap, .preparedForIndex, .backtraceFrame, .buildStarted, .preparationComplete, .targetUpToDate, .targetComplete, .taskUpToDate:
@@ -503,6 +511,7 @@ public final class SwiftBuildSystem: SPMBuildCore.BuildSystem {
             } catch {
                 throw error
             }
+            return BuildResult(serializedDiagnosticPathsByTargetName: .success(serializedDiagnosticPathsByTargetName))
         }
     }