tests: add import statements to workaround linker errors in all relevant tests.

This is needed if we compile StdlibUnittest with -sil-serialize-all
So far I added the imports only in files which needed them. But this may change, depending on the optimizer (inlining).
Adding them in all files doesn't harm and avoids confusion if someone makes an unrelated change which would result in such a linker error.

test/1_stdlib/BoolBridge.swift

@@ -5,6 +5,14 @@
 import Foundation
 import StdlibUnittest
 
+// Also import modules which are used by StdlibUnittest internally. This
+// workaround is needed to link all required libraries in case we compile
+// StdlibUnittest with -sil-serialize-all.
+import SwiftPrivate
+#if _runtime(_ObjC)
+import ObjectiveC
+#endif
+
 let BoolTests = TestSuite("Bool")
 
 BoolTests.test("Init with NSNumber") {

test/1_stdlib/Builtins.swift

@@ -21,6 +21,14 @@ import Swift
 import SwiftShims
 import StdlibUnittest
 
+// Also import modules which are used by StdlibUnittest internally. This
+// workaround is needed to link all required libraries in case we compile
+// StdlibUnittest with -sil-serialize-all.
+import SwiftPrivate
+#if _runtime(_ObjC)
+import ObjectiveC
+#endif
+
 #if _runtime(_ObjC)
 import Foundation
 #endif

test/1_stdlib/CollectionDiagnostics.swift

@@ -2,6 +2,14 @@
 
 import StdlibUnittest
 
+// Also import modules which are used by StdlibUnittest internally. This
+// workaround is needed to link all required libraries in case we compile
+// StdlibUnittest with -sil-serialize-all.
+import SwiftPrivate
+#if _runtime(_ObjC)
+import ObjectiveC
+#endif
+
 //
 // Check that CollectionType.SubSequence is constrained to CollectionType.
 //

test/1_stdlib/DarwinAPI.swift

@@ -4,6 +4,15 @@
 // REQUIRES: objc_interop
 
 import StdlibUnittest
+
+// Also import modules which are used by StdlibUnittest internally. This
+// workaround is needed to link all required libraries in case we compile
+// StdlibUnittest with -sil-serialize-all.
+import SwiftPrivate
+#if _runtime(_ObjC)
+import ObjectiveC
+#endif
+
 import Foundation
 
 var DarwinBooleanAPI = TestSuite("DarwinBooleanAPI")

test/1_stdlib/DictionaryLiteral.swift

@@ -18,6 +18,14 @@ import SwiftExperimental
 import Foundation
 import StdlibUnittest
 
+// Also import modules which are used by StdlibUnittest internally. This
+// workaround is needed to link all required libraries in case we compile
+// StdlibUnittest with -sil-serialize-all.
+import SwiftPrivate
+#if _runtime(_ObjC)
+import ObjectiveC
+#endif
+
 // Check that the generic parameters are called 'Key' and 'Value'.
 protocol TestProtocol1 {}
 

test/1_stdlib/Dispatch.swift

@@ -7,6 +7,14 @@ import Dispatch
 import Foundation
 import StdlibUnittest
 
+// Also import modules which are used by StdlibUnittest internally. This
+// workaround is needed to link all required libraries in case we compile
+// StdlibUnittest with -sil-serialize-all.
+import SwiftPrivate
+#if _runtime(_ObjC)
+import ObjectiveC
+#endif
+
 defer { runAllTests() }
 
 var DispatchAPI = TestSuite("DispatchAPI")

test/1_stdlib/ErrorTypeBridging.swift

@@ -3,6 +3,15 @@
 // REQUIRES: objc_interop
 
 import StdlibUnittest
+
+// Also import modules which are used by StdlibUnittest internally. This
+// workaround is needed to link all required libraries in case we compile
+// StdlibUnittest with -sil-serialize-all.
+import SwiftPrivate
+#if _runtime(_ObjC)
+import ObjectiveC
+#endif
+
 import Foundation
 import CoreLocation
 import Darwin

test/1_stdlib/ManagedBuffer.swift

@@ -16,6 +16,15 @@
 // XFAIL: linux
 
 import StdlibUnittest
+
+// Also import modules which are used by StdlibUnittest internally. This
+// workaround is needed to link all required libraries in case we compile
+// StdlibUnittest with -sil-serialize-all.
+import SwiftPrivate
+#if _runtime(_ObjC)
+import ObjectiveC
+#endif
+
 import Foundation
 
 // Check that `NonObjectiveCBase` can be subclassed and the subclass can be

test/1_stdlib/NSArrayAPI.swift

@@ -4,6 +4,15 @@
 // REQUIRES: objc_interop
 
 import StdlibUnittest
+
+// Also import modules which are used by StdlibUnittest internally. This
+// workaround is needed to link all required libraries in case we compile
+// StdlibUnittest with -sil-serialize-all.
+import SwiftPrivate
+#if _runtime(_ObjC)
+import ObjectiveC
+#endif
+
 import Foundation
 
 var NSArrayAPI = TestSuite("NSArrayAPI")

test/1_stdlib/NSDictionary.swift

@@ -4,6 +4,15 @@
 // REQUIRES: objc_interop
 
 import StdlibUnittest
+
+// Also import modules which are used by StdlibUnittest internally. This
+// workaround is needed to link all required libraries in case we compile
+// StdlibUnittest with -sil-serialize-all.
+import SwiftPrivate
+#if _runtime(_ObjC)
+import ObjectiveC
+#endif
+
 import Foundation
 
 var tests = TestSuite("NSDictionary")

test/1_stdlib/NSEnumeratorAPI.swift

@@ -4,6 +4,15 @@
 // REQUIRES: objc_interop
 
 import StdlibUnittest
+
+// Also import modules which are used by StdlibUnittest internally. This
+// workaround is needed to link all required libraries in case we compile
+// StdlibUnittest with -sil-serialize-all.
+import SwiftPrivate
+#if _runtime(_ObjC)
+import ObjectiveC
+#endif
+
 import Foundation
 
 var NSEnumeratorAPI = TestSuite("NSEnumeratorAPI")

test/1_stdlib/NSSetAPI.swift

@@ -4,6 +4,15 @@
 // REQUIRES: objc_interop
 
 import StdlibUnittest
+
+// Also import modules which are used by StdlibUnittest internally. This
+// workaround is needed to link all required libraries in case we compile
+// StdlibUnittest with -sil-serialize-all.
+import SwiftPrivate
+#if _runtime(_ObjC)
+import ObjectiveC
+#endif
+
 import Foundation
 
 var NSSetAPI = TestSuite("NSSetAPI")

test/1_stdlib/NSStringAPI.swift

@@ -11,6 +11,15 @@
 //
 
 import StdlibUnittest
+
+// Also import modules which are used by StdlibUnittest internally. This
+// workaround is needed to link all required libraries in case we compile
+// StdlibUnittest with -sil-serialize-all.
+import SwiftPrivate
+#if _runtime(_ObjC)
+import ObjectiveC
+#endif
+
 import Foundation
 import StdlibUnittestFoundationExtras
 

test/1_stdlib/NSValueBridging.swift

@@ -16,6 +16,15 @@
 // REQUIRES: objc_interop
 
 import StdlibUnittest
+
+// Also import modules which are used by StdlibUnittest internally. This
+// workaround is needed to link all required libraries in case we compile
+// StdlibUnittest with -sil-serialize-all.
+import SwiftPrivate
+#if _runtime(_ObjC)
+import ObjectiveC
+#endif
+
 import Foundation
 
 var nsValueBridging = TestSuite("NSValueBridging")

test/1_stdlib/RuntimeObjC.swift

@@ -8,6 +8,15 @@
 
 import Swift
 import StdlibUnittest
+
+// Also import modules which are used by StdlibUnittest internally. This
+// workaround is needed to link all required libraries in case we compile
+// StdlibUnittest with -sil-serialize-all.
+import SwiftPrivate
+#if _runtime(_ObjC)
+import ObjectiveC
+#endif
+
 import Foundation
 import CoreGraphics
 import SwiftShims

test/1_stdlib/SceneKit.swift

@@ -5,6 +5,15 @@
 // UNSUPPORTED: OS=watchos
 
 import StdlibUnittest
+
+// Also import modules which are used by StdlibUnittest internally. This
+// workaround is needed to link all required libraries in case we compile
+// StdlibUnittest with -sil-serialize-all.
+import SwiftPrivate
+#if _runtime(_ObjC)
+import ObjectiveC
+#endif
+
 import SceneKit
 
 // SceneKit is only available on iOS 8.0 and above and on OS X 10.8 and above.

test/1_stdlib/Unicode.swift

@@ -15,6 +15,14 @@
 import Swift
 import StdlibUnittest
 
+// Also import modules which are used by StdlibUnittest internally. This
+// workaround is needed to link all required libraries in case we compile
+// StdlibUnittest with -sil-serialize-all.
+import SwiftPrivate
+#if _runtime(_ObjC)
+import ObjectiveC
+#endif
+
 var UnicodeInternals = TestSuite("UnicodeInternals")
 
 UnicodeInternals.test("copy") {

test/Interpreter/availability_weak_linking.swift

@@ -20,6 +20,14 @@
 
 import StdlibUnittest
 
+// Also import modules which are used by StdlibUnittest internally. This
+// workaround is needed to link all required libraries in case we compile
+// StdlibUnittest with -sil-serialize-all.
+import SwiftPrivate
+#if _runtime(_ObjC)
+import ObjectiveC
+#endif
+
 import FakeUnavailableObjCFramework
 import Foundation
 

test/Interpreter/class_resilience.swift

@@ -11,6 +11,15 @@
 // RUN: %target-run %t/main
 
 import StdlibUnittest
+
+// Also import modules which are used by StdlibUnittest internally. This
+// workaround is needed to link all required libraries in case we compile
+// StdlibUnittest with -sil-serialize-all.
+import SwiftPrivate
+#if _runtime(_ObjC)
+import ObjectiveC
+#endif
+
 import resilient_class
 import resilient_struct
 

test/Interpreter/enum_errortype.swift

@@ -3,6 +3,14 @@
 
 import StdlibUnittest
 
+// Also import modules which are used by StdlibUnittest internally. This
+// workaround is needed to link all required libraries in case we compile
+// StdlibUnittest with -sil-serialize-all.
+import SwiftPrivate
+#if _runtime(_ObjC)
+import ObjectiveC
+#endif
+
 enum ClericalErrorDomain: ErrorType {
   case MisplacedDocument(name: String)
   case AccidentallyErasedTape(fromMinute: Double, toMinute: Double)

test/Interpreter/enum_resilience.swift

@@ -10,6 +10,15 @@
 // RUN: %target-run %t/main
 
 import StdlibUnittest
+
+// Also import modules which are used by StdlibUnittest internally. This
+// workaround is needed to link all required libraries in case we compile
+// StdlibUnittest with -sil-serialize-all.
+import SwiftPrivate
+#if _runtime(_ObjC)
+import ObjectiveC
+#endif
+
 import resilient_enum
 import resilient_struct
 

test/Interpreter/global_resilience.swift

@@ -7,6 +7,15 @@
 // RUN: %target-run %t/main
 
 import StdlibUnittest
+
+// Also import modules which are used by StdlibUnittest internally. This
+// workaround is needed to link all required libraries in case we compile
+// StdlibUnittest with -sil-serialize-all.
+import SwiftPrivate
+#if _runtime(_ObjC)
+import ObjectiveC
+#endif
+
 import resilient_global
 import resilient_struct
 

test/Interpreter/struct_resilience.swift

@@ -5,6 +5,15 @@
 // RUN: %target-run %t/main
 
 import StdlibUnittest
+
+// Also import modules which are used by StdlibUnittest internally. This
+// workaround is needed to link all required libraries in case we compile
+// StdlibUnittest with -sil-serialize-all.
+import SwiftPrivate
+#if _runtime(_ObjC)
+import ObjectiveC
+#endif
+
 import resilient_struct
 
 var ResilientStructTestSuite = TestSuite("ResilientStruct")

test/Prototypes/CollectionTransformers.swift

@@ -1304,6 +1304,14 @@ public func transform<C : CollectionType>(c: C)
 
 import StdlibUnittest
 
+// Also import modules which are used by StdlibUnittest internally. This
+// workaround is needed to link all required libraries in case we compile
+// StdlibUnittest with -sil-serialize-all.
+import SwiftPrivate
+#if _runtime(_ObjC)
+import ObjectiveC
+#endif
+
 var t = TestSuite("t")
 
 t.test("fusion/map+reduce") {

validation-test/stdlib/CoreMedia.swift

@@ -5,6 +5,15 @@
 // UNSUPPORTED: OS=watchos
 
 import StdlibUnittest
+
+// Also import modules which are used by StdlibUnittest internally. This
+// workaround is needed to link all required libraries in case we compile
+// StdlibUnittest with -sil-serialize-all.
+import SwiftPrivate
+#if _runtime(_ObjC)
+import ObjectiveC
+#endif
+
 import CoreMedia
 
 var CoreMediaTests = TestSuite("CoreMedia")

validation-test/stdlib/CoreMediaOverlay.swift

@@ -5,6 +5,15 @@
 // UNSUPPORTED: OS=watchos
 
 import StdlibUnittest
+
+// Also import modules which are used by StdlibUnittest internally. This
+// workaround is needed to link all required libraries in case we compile
+// StdlibUnittest with -sil-serialize-all.
+import SwiftPrivate
+#if _runtime(_ObjC)
+import ObjectiveC
+#endif
+
 import CoreMedia
 
 var CMTimeTests = TestSuite("CMTime")

validation-test/stdlib/Dictionary.swift

@@ -12,6 +12,15 @@
 
 import Darwin
 import StdlibUnittest
+
+// Also import modules which are used by StdlibUnittest internally. This
+// workaround is needed to link all required libraries in case we compile
+// StdlibUnittest with -sil-serialize-all.
+import SwiftPrivate
+#if _runtime(_ObjC)
+import ObjectiveC
+#endif
+
 import Foundation
 import StdlibUnittestFoundationExtras
 

validation-test/stdlib/GameplayKit.swift

@@ -5,6 +5,15 @@
 // UNSUPPORTED: OS=watchos
 
 import StdlibUnittest
+
+// Also import modules which are used by StdlibUnittest internally. This
+// workaround is needed to link all required libraries in case we compile
+// StdlibUnittest with -sil-serialize-all.
+import SwiftPrivate
+#if _runtime(_ObjC)
+import ObjectiveC
+#endif
+
 import GameplayKit
 
 // GameplayKit is only available on iOS 9.0 and above, OS X 10.11 and above, and

validation-test/stdlib/Glibc.swift

@@ -5,6 +5,15 @@
 
 import Swift
 import StdlibUnittest
+
+// Also import modules which are used by StdlibUnittest internally. This
+// workaround is needed to link all required libraries in case we compile
+// StdlibUnittest with -sil-serialize-all.
+import SwiftPrivate
+#if _runtime(_ObjC)
+import ObjectiveC
+#endif
+
 import Glibc
 
 var GlibcTestSuite = TestSuite("Glibc")

validation-test/stdlib/ObjectiveC.swift

@@ -6,6 +6,14 @@
 import ObjectiveC
 import StdlibUnittest
 
+// Also import modules which are used by StdlibUnittest internally. This
+// workaround is needed to link all required libraries in case we compile
+// StdlibUnittest with -sil-serialize-all.
+import SwiftPrivate
+#if _runtime(_ObjC)
+import ObjectiveC
+#endif
+
 var ObjectiveCTests = TestSuite("ObjectiveC")
 
 class NSObjectWithCustomHashable : NSObject {

validation-test/stdlib/OpenCLSDKOverlay.swift

@@ -54,6 +54,15 @@
 
 import OpenCL
 import StdlibUnittest
+
+// Also import modules which are used by StdlibUnittest internally. This
+// workaround is needed to link all required libraries in case we compile
+// StdlibUnittest with -sil-serialize-all.
+import SwiftPrivate
+#if _runtime(_ObjC)
+import ObjectiveC
+#endif
+
 import Foundation
 import Darwin
 

validation-test/stdlib/SceneKit.swift

@@ -5,6 +5,15 @@
 // UNSUPPORTED: OS=watchos
 
 import StdlibUnittest
+
+// Also import modules which are used by StdlibUnittest internally. This
+// workaround is needed to link all required libraries in case we compile
+// StdlibUnittest with -sil-serialize-all.
+import SwiftPrivate
+#if _runtime(_ObjC)
+import ObjectiveC
+#endif
+
 import SceneKit
 
 // SceneKit is only available on iOS 8.0 and above and on OS X 10.8 and above.

validation-test/stdlib/Set.swift

@@ -11,6 +11,15 @@
 // XFAIL: linux
 
 import StdlibUnittest
+
+// Also import modules which are used by StdlibUnittest internally. This
+// workaround is needed to link all required libraries in case we compile
+// StdlibUnittest with -sil-serialize-all.
+import SwiftPrivate
+#if _runtime(_ObjC)
+import ObjectiveC
+#endif
+
 import Foundation
 
 // For experimental Set operators

validation-test/stdlib/StdlibUnittestFailure.swift

@@ -9,6 +9,14 @@
 
 import StdlibUnittest
 
+// Also import modules which are used by StdlibUnittest internally. This
+// workaround is needed to link all required libraries in case we compile
+// StdlibUnittest with -sil-serialize-all.
+import SwiftPrivate
+#if _runtime(_ObjC)
+import ObjectiveC
+#endif
+
 var TestSuiteFails = TestSuite("TestSuiteFails")
 
 TestSuiteFails.test("fails") {

validation-test/stdlib/StdlibUnittestMisc.swift

@@ -3,6 +3,14 @@
 
 import StdlibUnittest
 
+// Also import modules which are used by StdlibUnittest internally. This
+// workaround is needed to link all required libraries in case we compile
+// StdlibUnittest with -sil-serialize-all.
+import SwiftPrivate
+#if _runtime(_ObjC)
+import ObjectiveC
+#endif
+
 //
 // Test OS version parsing
 //

validation-test/stdlib/StdlibUnittestStaticAssertions.swift

@@ -2,6 +2,14 @@
 
 import StdlibUnittest
 
+// Also import modules which are used by StdlibUnittest internally. This
+// workaround is needed to link all required libraries in case we compile
+// StdlibUnittest with -sil-serialize-all.
+import SwiftPrivate
+#if _runtime(_ObjC)
+import ObjectiveC
+#endif
+
 struct S1 {}
 struct S2 {}
 

validation-test/stdlib/Unicode.swift

@@ -6,6 +6,15 @@
 
 import SwiftPrivate
 import StdlibUnittest
+
+// Also import modules which are used by StdlibUnittest internally. This
+// workaround is needed to link all required libraries in case we compile
+// StdlibUnittest with -sil-serialize-all.
+import SwiftPrivate
+#if _runtime(_ObjC)
+import ObjectiveC
+#endif
+
 import Foundation
 
 var UTF16APIs = TestSuite("UTF16APIs")

validation-test/stdlib/UnicodeUTFEncoders.swift

@@ -4,6 +4,15 @@
 
 import SwiftPrivate
 import StdlibUnittest
+
+// Also import modules which are used by StdlibUnittest internally. This
+// workaround is needed to link all required libraries in case we compile
+// StdlibUnittest with -sil-serialize-all.
+import SwiftPrivate
+#if _runtime(_ObjC)
+import ObjectiveC
+#endif
+
 import Foundation
 
 @_silgen_name("random") func random() -> UInt32

validation-test/stdlib/WatchKit.swift

@@ -5,6 +5,15 @@
 // REQUIRES: OS=watchos
 
 import StdlibUnittest
+
+// Also import modules which are used by StdlibUnittest internally. This
+// workaround is needed to link all required libraries in case we compile
+// StdlibUnittest with -sil-serialize-all.
+import SwiftPrivate
+#if _runtime(_ObjC)
+import ObjectiveC
+#endif
+
 import WatchKit
 
 var WatchKitTests = TestSuite("WatchKit")

validation-test/stdlib/XCTest.swift

@@ -11,6 +11,15 @@
 // XFAIL: OS=watchos
 
 import StdlibUnittest
+
+// Also import modules which are used by StdlibUnittest internally. This
+// workaround is needed to link all required libraries in case we compile
+// StdlibUnittest with -sil-serialize-all.
+import SwiftPrivate
+#if _runtime(_ObjC)
+import ObjectiveC
+#endif
+
 import XCTest
 
 var XCTestTestSuite = TestSuite("XCTest")