[wasm] Exclude some completely unavailable APIs from build

Sources/Foundation/DispatchData+DataProtocol.swift

@@ -10,7 +10,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-
+#if canImport(Dispatch)
 import Dispatch
 
 extension DispatchData : DataProtocol {
@@ -54,3 +54,4 @@ extension DispatchData : DataProtocol {
  return regions
  }
 }
+#endif

Sources/Foundation/NSNotification.swift

@@ -82,6 +82,8 @@ open class NSNotification: NSObject, NSCopying, NSCoding {
  }
 }
 
+#if canImport(Dispatch)
+
 private class NSNotificationReceiver : NSObject {
  fileprivate var name: Notification.Name?
  fileprivate var block: ((Notification) -> Void)?
@@ -191,3 +193,5 @@ open class NotificationCenter: NSObject {
  }
 
 }
+
+#endif // canImport(Dispatch)

Sources/Foundation/NotificationQueue.swift

@@ -7,6 +7,7 @@
 // See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
 //
 
+#if canImport(Dispatch)
 @_implementationOnly import CoreFoundation
 
 extension NotificationQueue {
@@ -176,3 +177,5 @@ open class NotificationQueue: NSObject {
  }
 
 }
+
+#endif

Sources/Foundation/Operation.swift

@@ -7,6 +7,7 @@
 // See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
 //
 
+#if canImport(Dispatch)
 import Dispatch
 
 internal let _NSOperationIsFinished = "isFinished"
@@ -1438,3 +1439,4 @@ extension OperationQueue {
  }
  }
 }
+#endif

Sources/Foundation/Port.swift

@@ -83,6 +83,13 @@ public protocol PortDelegate: AnyObject {
  func handle(_ message: PortMessage)
 }
 
+#if os(WASI)
+
+@available(*, unavailable, message: "SocketPort is not available on this platform.")
+open class SocketPort: Port {}
+
+#else
+
 #if canImport(Glibc) && !os(Android) && !os(OpenBSD)
 import Glibc
 fileprivate let SOCK_STREAM = Int32(Glibc.SOCK_STREAM.rawValue)
@@ -1106,3 +1113,5 @@ fileprivate extension Data {
  return self[...self.index(self.startIndex, offsetBy: range.upperBound)]
  }
 }
+
+#endif

Sources/Foundation/Process.swift

@@ -7,6 +7,7 @@
 // See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
 //
 
+#if canImport(Dispatch)
 @_implementationOnly import CoreFoundation
 #if os(Windows)
 import WinSDK
@@ -1174,3 +1175,5 @@ extension Process {
 
  public static let didTerminateNotification = NSNotification.Name(rawValue: "NSTaskDidTerminateNotification")
 }
+
+#endif

Sources/Foundation/Progress.swift

@@ -7,6 +7,7 @@
 // See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
 //
 
+#if canImport(Dispatch)
 import Dispatch
 
 /**
@@ -545,3 +546,4 @@ fileprivate class _ProgressTSD : NSObject {
  childAttached = false
  }
 }
+#endif

Sources/Foundation/RunLoop.swift

@@ -51,6 +51,24 @@ extension RunLoop.Mode {
  }
 }
 
+#if !canImport(Dispatch)
+
+open class RunLoop: NSObject {
+ @available(*, unavailable, message: "RunLoop is not available on WASI")
+ open class var current: RunLoop {
+ fatalError("RunLoop is not available on WASI")
+ }
+
+ @available(*, unavailable, message: "RunLoop is not available on WASI")
+ open class var main: RunLoop {
+ fatalError("RunLoop is not available on WASI")
+ }
+
+ internal final var currentCFRunLoop: CFRunLoop { NSUnsupported() }
+}
+
+#else
+
 internal func _NSRunLoopNew(_ cf: CFRunLoop) -> Unmanaged<AnyObject> {
  let rl = Unmanaged<RunLoop>.passRetained(RunLoop(cfObject: cf))
  return unsafeBitCast(rl, to: Unmanaged<AnyObject>.self) // this retain is balanced on the other side of the CF fence
@@ -421,3 +439,5 @@ extension RunLoop._Source {
  unsafeBitCast(_cfSourceStorage, to: CFRunLoopSource.self)
  }
 }
+
+#endif // canImport(Dispatch)

Sources/Foundation/Thread.swift

@@ -7,6 +7,7 @@
 // See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
 //
 
+#if canImport(Dispatch)
 @_implementationOnly import CoreFoundation
 #if os(Windows)
 import WinSDK
@@ -448,3 +449,4 @@ extension NSNotification.Name {
  public static let NSDidBecomeSingleThreaded = NSNotification.Name(rawValue: "NSDidBecomeSingleThreadedNotification")
  public static let NSThreadWillExit = NSNotification.Name(rawValue: "NSThreadWillExitNotification")
 }
+#endif

Sources/Foundation/UserDefaults.swift

@@ -406,7 +406,9 @@ open class UserDefaults: NSObject {
 
  _ = defaults.synchronize()
 
+#if canImport(Dispatch)
  NotificationCenter.default.post(name: UserDefaults.didChangeNotification, object: self)
+#endif
  }
  }
 
@@ -418,7 +420,9 @@ open class UserDefaults: NSObject {
 
  _ = defaults.synchronize()
 
+#if canImport(Dispatch)
  NotificationCenter.default.post(name: UserDefaults.didChangeNotification, object: self)
+#endif
  }
  }