Build SourceKit-LSP in the Swift 6 language mode

Package.swift

@@ -3,12 +3,6 @@
 import Foundation
 import PackageDescription
 
-let strictConcurrencySettings: [SwiftSetting] = [
-  .enableUpcomingFeature("StrictConcurrency"),
-  .enableUpcomingFeature("RegionBasedIsolation"),
-  .enableUpcomingFeature("InferSendableFromCaptures"),
-]
-
 let package = Package(
   name: "SourceKitLSP",
   platforms: [.macOS(.v13)],
@@ -40,7 +34,6 @@ let package = Package(
         .product(name: "SwiftToolsSupport-auto", package: "swift-tools-support-core"),
       ],
       exclude: ["CMakeLists.txt"],
-      swiftSettings: strictConcurrencySettings,
       linkerSettings: sourcekitLSPLinkSettings
     ),
 
@@ -52,8 +45,7 @@ let package = Package(
       dependencies: [
         "LanguageServerProtocol"
       ],
-      exclude: ["CMakeLists.txt"],
-      swiftSettings: strictConcurrencySettings
+      exclude: ["CMakeLists.txt"]
     ),
 
     // MARK: CAtomics
@@ -94,8 +86,7 @@ let package = Package(
         .product(name: "SwiftParser", package: "swift-syntax"),
         .product(name: "SwiftToolsSupport-auto", package: "swift-tools-support-core"),
       ],
-      exclude: ["CMakeLists.txt"],
-      swiftSettings: strictConcurrencySettings
+      exclude: ["CMakeLists.txt"]
     ),
 
     .testTarget(
@@ -108,8 +99,7 @@ let package = Package(
         "SKCore",
         "SKTestSupport",
         .product(name: "SwiftToolsSupport-auto", package: "swift-tools-support-core"),
-      ],
-      swiftSettings: strictConcurrencySettings
+      ]
     ),
 
     // MARK: InProcessClient
@@ -122,26 +112,23 @@ let package = Package(
         "SKCore",
         "SourceKitLSP",
       ],
-      exclude: ["CMakeLists.txt"],
-      swiftSettings: strictConcurrencySettings
+      exclude: ["CMakeLists.txt"]
     ),
 
     // MARK: LanguageServerProtocol
     // The core LSP types, suitable for any LSP implementation.
     .target(
       name: "LanguageServerProtocol",
       dependencies: [],
-      exclude: ["CMakeLists.txt"],
-      swiftSettings: strictConcurrencySettings
+      exclude: ["CMakeLists.txt"]
     ),
 
     .testTarget(
       name: "LanguageServerProtocolTests",
       dependencies: [
         "LanguageServerProtocol",
         "LSPTestSupport",
-      ],
-      swiftSettings: strictConcurrencySettings
+      ]
     ),
 
     // MARK: LanguageServerProtocolJSONRPC
@@ -153,17 +140,15 @@ let package = Package(
         "LanguageServerProtocol",
         "LSPLogging",
       ],
-      exclude: ["CMakeLists.txt"],
-      swiftSettings: strictConcurrencySettings
+      exclude: ["CMakeLists.txt"]
     ),
 
     .testTarget(
       name: "LanguageServerProtocolJSONRPCTests",
       dependencies: [
         "LanguageServerProtocolJSONRPC",
         "LSPTestSupport",
-      ],
-      swiftSettings: strictConcurrencySettings
+      ]
     ),
 
     // MARK: LSPLogging
@@ -176,16 +161,15 @@ let package = Package(
         .product(name: "Crypto", package: "swift-crypto"),
       ],
       exclude: ["CMakeLists.txt"],
-      swiftSettings: lspLoggingSwiftSettings + strictConcurrencySettings
+      swiftSettings: lspLoggingSwiftSettings
     ),
 
     .testTarget(
       name: "LSPLoggingTests",
       dependencies: [
         "LSPLogging",
         "SKTestSupport",
-      ],
-      swiftSettings: strictConcurrencySettings
+      ]
     ),
 
     // MARK: LSPTestSupport
@@ -198,8 +182,7 @@ let package = Package(
         "LanguageServerProtocolJSONRPC",
         "SKSupport",
         "SwiftExtensions",
-      ],
-      swiftSettings: strictConcurrencySettings
+      ]
     ),
 
     // MARK: SemanticIndex
@@ -213,8 +196,7 @@ let package = Package(
         "SwiftExtensions",
         .product(name: "IndexStoreDB", package: "indexstore-db"),
       ],
-      exclude: ["CMakeLists.txt"],
-      swiftSettings: strictConcurrencySettings
+      exclude: ["CMakeLists.txt"]
     ),
 
     .testTarget(
@@ -223,8 +205,7 @@ let package = Package(
         "LSPLogging",
         "SemanticIndex",
         "SKTestSupport",
-      ],
-      swiftSettings: strictConcurrencySettings
+      ]
     ),
 
     // MARK: SKCore
@@ -244,17 +225,15 @@ let package = Package(
         .product(name: "SwiftPMDataModel-auto", package: "swift-package-manager"),
         .product(name: "SwiftToolsSupport-auto", package: "swift-tools-support-core"),
       ],
-      exclude: ["CMakeLists.txt"],
-      swiftSettings: strictConcurrencySettings
+      exclude: ["CMakeLists.txt"]
     ),
 
     .testTarget(
       name: "SKCoreTests",
       dependencies: [
         "SKCore",
         "SKTestSupport",
-      ],
-      swiftSettings: strictConcurrencySettings
+      ]
     ),
 
     // MARK: SKSupport
@@ -270,8 +249,7 @@ let package = Package(
         "SwiftExtensions",
         .product(name: "SwiftToolsSupport-auto", package: "swift-tools-support-core"),
       ],
-      exclude: ["CMakeLists.txt"],
-      swiftSettings: strictConcurrencySettings
+      exclude: ["CMakeLists.txt"]
     ),
 
     .testTarget(
@@ -281,8 +259,7 @@ let package = Package(
         "SKSupport",
         "SKTestSupport",
         "SwiftExtensions",
-      ],
-      swiftSettings: strictConcurrencySettings
+      ]
     ),
 
     // MARK: SKSwiftPMWorkspace
@@ -298,8 +275,7 @@ let package = Package(
         .product(name: "SwiftPM-auto", package: "swift-package-manager"),
         .product(name: "SwiftToolsSupport-auto", package: "swift-tools-support-core"),
       ],
-      exclude: ["CMakeLists.txt"],
-      swiftSettings: strictConcurrencySettings
+      exclude: ["CMakeLists.txt"]
     ),
 
     .testTarget(
@@ -313,8 +289,7 @@ let package = Package(
         "SourceKitLSP",
         .product(name: "SwiftPM-auto", package: "swift-package-manager"),
         .product(name: "SwiftToolsSupport-auto", package: "swift-tools-support-core"),
-      ],
-      swiftSettings: strictConcurrencySettings
+      ]
     ),
 
     // MARK: SKTestSupport
@@ -333,8 +308,7 @@ let package = Package(
         .product(name: "ISDBTestSupport", package: "indexstore-db"),
         .product(name: "SwiftToolsSupport-auto", package: "swift-tools-support-core"),
       ],
-      resources: [.copy("INPUTS")],
-      swiftSettings: strictConcurrencySettings
+      resources: [.copy("INPUTS")]
     ),
 
     // MARK: SourceKitD
@@ -348,8 +322,7 @@ let package = Package(
         "SwiftExtensions",
         .product(name: "SwiftToolsSupport-auto", package: "swift-tools-support-core"),
       ],
-      exclude: ["CMakeLists.txt", "sourcekitd_uids.swift.gyb"],
-      swiftSettings: strictConcurrencySettings
+      exclude: ["CMakeLists.txt", "sourcekitd_uids.swift.gyb"]
     ),
 
     .testTarget(
@@ -359,8 +332,7 @@ let package = Package(
         "SKCore",
         "SKTestSupport",
         "SwiftExtensions",
-      ],
-      swiftSettings: strictConcurrencySettings
+      ]
     ),
 
     // MARK: SourceKitLSP
@@ -390,8 +362,7 @@ let package = Package(
         .product(name: "SwiftToolsSupport-auto", package: "swift-tools-support-core"),
         .product(name: "SwiftPM-auto", package: "swift-package-manager"),
       ],
-      exclude: ["CMakeLists.txt"],
-      swiftSettings: strictConcurrencySettings
+      exclude: ["CMakeLists.txt"]
     ),
 
     .testTarget(
@@ -416,18 +387,17 @@ let package = Package(
         // be used by test cases that test macros (see `SwiftPMTestProject.macroPackageManifest`).
         .product(name: "SwiftCompilerPlugin", package: "swift-syntax"),
         .product(name: "SwiftSyntaxMacros", package: "swift-syntax"),
-      ],
-      swiftSettings: strictConcurrencySettings
+      ]
     ),
 
     // MARK: SwiftExtensions
 
     .target(
       name: "SwiftExtensions",
-      exclude: ["CMakeLists.txt"],
-      swiftSettings: strictConcurrencySettings
+      exclude: ["CMakeLists.txt"]
     ),
-  ]
+  ],
+  swiftLanguageVersions: [.v5, .version("6")]
 )
 
 // MARK: - Parse build arguments

Sources/Diagnose/IndexCommand.swift

@@ -120,8 +120,4 @@ fileprivate extension SourceKitLSPServer {
   }
 }
 
-#if compiler(>=6)
-extension ExperimentalFeature: @retroactive ExpressibleByArgument {}
-#else
 extension ExperimentalFeature: ExpressibleByArgument {}
-#endif

Sources/Diagnose/StderrStreamConcurrencySafe.swift

@@ -10,11 +10,16 @@
 //
 //===----------------------------------------------------------------------===//
 
-import TSCLibc
-
 import class TSCBasic.LocalFileOutputByteStream
 import class TSCBasic.ThreadSafeOutputByteStream
 
+#if canImport(Darwin)
+import TSCLibc
+#else
+// FIXME: (async-workaround) @preconcurrency needed because stderr is not sendable on Linux rdar://125578486
+@preconcurrency import TSCLibc
+#endif
+
 // A version of `stderrStream` from `TSCBasic` that is a `let` and can thus be used from Swift 6.
 let stderrStreamConcurrencySafe: ThreadSafeOutputByteStream = try! ThreadSafeOutputByteStream(
   LocalFileOutputByteStream(

Sources/LSPLogging/NonDarwinLogging.swift

@@ -10,9 +10,16 @@
 //
 //===----------------------------------------------------------------------===//
 
-import Foundation
 import SwiftExtensions
 
+#if canImport(Darwin)
+import Foundation
+#else
+// FIMXE: (async-workaround) @preconcurrency needed because DateFormatter and stderr are not marked as Sendable on Linux
+// rdar://125578486, rdar://132378589
+@preconcurrency import Foundation
+#endif
+
 // MARK: - Log settings
 
 package enum LogConfig {

Sources/LSPLogging/SetGlobalLogFileHandler.swift

@@ -10,9 +10,16 @@
 //
 //===----------------------------------------------------------------------===//
 
-import Foundation
 import RegexBuilder
 
+#if canImport(Darwin)
+import Foundation
+#else
+// FIMXE: (async-workaround) @preconcurrency needed because DateFormatter and stderr are not marked as Sendable on Linux
+// rdar://125578486, rdar://132378589
+@preconcurrency import Foundation
+#endif
+
 #if os(Windows)
 import WinSDK
 #endif

Sources/LSPTestSupport/Assertions.swift

@@ -112,36 +112,34 @@ package func unwrap<T>(
   return try XCTUnwrap(expression, file: file, line: line)
 }
 
-extension XCTestCase {
-  private struct ExpectationNotFulfilledError: Error, CustomStringConvertible {
-    var expecatations: [XCTestExpectation]
+private struct ExpectationNotFulfilledError: Error, CustomStringConvertible {
+  var expecatations: [XCTestExpectation]
 
-    var description: String {
-      return """
-        One of the expectation was not fulfilled within timeout: \
-        \(expecatations.map(\.description).joined(separator: ", "))
-        """
-    }
+  var description: String {
+    return """
+      One of the expectation was not fulfilled within timeout: \
+      \(expecatations.map(\.description).joined(separator: ", "))
+      """
   }
+}
 
-  /// Wait for the given expectations to be fulfilled. If the expectations aren't
-  /// fulfilled within `timeout`, throw an error, aborting the test execution.
-  package func fulfillmentOfOrThrow(
-    _ expectations: [XCTestExpectation],
-    timeout: TimeInterval = defaultTimeout,
-    enforceOrder enforceOrderOfFulfillment: Bool = false
-  ) async throws {
-    // `XCTWaiter.fulfillment` was introduced in the macOS 13.3 SDK but marked as being available on macOS 10.15.
-    // At the same time that XCTWaiter.fulfillment was introduced `XCTWaiter.wait` was deprecated in async contexts.
-    // This means that we can't write code that compiles without warnings with both the macOS 13.3 and any previous SDK.
-    // Accepting the warning here when compiling with macOS 13.3 or later is the only thing that I know of that we can do here.
-    let started = await XCTWaiter.fulfillment(
-      of: expectations,
-      timeout: timeout,
-      enforceOrder: enforceOrderOfFulfillment
-    )
-    if started != .completed {
-      throw ExpectationNotFulfilledError(expecatations: expectations)
-    }
+/// Wait for the given expectations to be fulfilled. If the expectations aren't
+/// fulfilled within `timeout`, throw an error, aborting the test execution.
+package nonisolated func fulfillmentOfOrThrow(
+  _ expectations: [XCTestExpectation],
+  timeout: TimeInterval = defaultTimeout,
+  enforceOrder enforceOrderOfFulfillment: Bool = false
+) async throws {
+  // `XCTWaiter.fulfillment` was introduced in the macOS 13.3 SDK but marked as being available on macOS 10.15.
+  // At the same time that XCTWaiter.fulfillment was introduced `XCTWaiter.wait` was deprecated in async contexts.
+  // This means that we can't write code that compiles without warnings with both the macOS 13.3 and any previous SDK.
+  // Accepting the warning here when compiling with macOS 13.3 or later is the only thing that I know of that we can do here.
+  let started = await XCTWaiter.fulfillment(
+    of: expectations,
+    timeout: timeout,
+    enforceOrder: enforceOrderOfFulfillment
+  )
+  if started != .completed {
+    throw ExpectationNotFulfilledError(expecatations: expectations)
   }
 }