Bump Swift version to 4.0

CMakeLists.txt

@@ -105,7 +105,7 @@ set(SWIFT_ANALYZE_CODE_COVERAGE FALSE CACHE STRING
 set_property(CACHE SWIFT_ANALYZE_CODE_COVERAGE PROPERTY
     STRINGS FALSE "NOT-MERGED" "MERGED")
 
-set(SWIFT_VERSION "3.1" CACHE STRING
+set(SWIFT_VERSION "4.0" CACHE STRING
     "The user-visible version of the Swift compiler")
 set(SWIFT_VENDOR "" CACHE STRING
     "The vendor name of the Swift compiler")

benchmark/cmake/modules/AddSwiftBenchmarkSuite.cmake

@@ -42,6 +42,7 @@ function (swift_benchmark_compile_archopts)
   set(bench_flags "${${benchvar}}")
 
   set(common_options
+      "-swift-version" "3" # FIXME: Force Swift 3 version compatibility.
       "-c"
       "-sdk" "${sdk}"
       "-target" "${target}"

cmake/modules/SwiftSource.cmake

@@ -268,6 +268,11 @@ function(_compile_swift_files
     endif()
   endif()
 
+  # Force swift 3 compatibility mode for Standard Library and overlay.
+  if (SWIFTFILE_IS_STDLIB OR SWIFTFILE_IS_SDK_OVERLAY)
+    list(APPEND swift_flags "-swift-version" "3")
+  endif()
+
   if(SWIFTFILE_IS_SDK_OVERLAY)
     list(APPEND swift_flags "-autolink-force-load")
   endif()

lib/Basic/Version.cpp

@@ -312,19 +312,23 @@ Optional<Version> Version::getEffectiveLanguageVersion() const {
     return None;
   }
 
-  // FIXME: When we switch to Swift 4 by default, the "3" case should return
-  // a version newer than any released 3.x compiler (probably "3.2"), and the
-  // "4" case should start returning getCurrentLanguageVersion. We should
+  // FIXME: When we switch to Swift 5 by default, the "4" case should return
+  // a version newer than any released 4.x compiler, and the
+  // "5" case should start returning getCurrentLanguageVersion. We should
   // also check for the presence of SWIFT_VERSION_PATCHLEVEL, and if that's
   // set apply it to the "3" case, so that Swift 4.0.1 will automatically
   // have a compatibility mode of 3.2.1.
   switch (Components[0]) {
   case 3:
-    static_assert(SWIFT_VERSION_MAJOR == 3,
+#ifdef SWIFT_VERSION_PATCHLEVEL
+    return Version{3, 2, SWIFT_VERSION_PATCHLEVEL};
+#else
+    return Version{3, 2};
+#endif
+  case 4:
+    static_assert(SWIFT_VERSION_MAJOR == 4,
                   "getCurrentLanguageVersion is no longer correct here");
     return Version::getCurrentLanguageVersion();
-  case 4:
-    return Version{4, 0};
   default:
     return None;
   }

test/Driver/swift-version-default.swift

@@ -18,9 +18,9 @@ jkl
 #endif
 
 #if swift(>=4)
-aoeu
+aoeu // expected-error {{use of unresolved identifier}}
 #else
-htn // expected-error {{use of unresolved identifier}}
+htn 
 #endif
 
 #if swift(>=4.1)

test/IDE/local_types.swift

@@ -1,8 +1,8 @@
 // Tests lookup and mangling of local types
 
 // RUN: rm -rf %t && mkdir -p %t
-// RUN: %target-swiftc_driver -v -emit-module -module-name LocalTypes -o %t/LocalTypes.swiftmodule %s
-// RUN: %target-swift-ide-test -print-local-types -I %t -module-to-print LocalTypes -source-filename %s | %FileCheck %s
+// RUN: %target-swiftc_driver -swift-version 3 -v -emit-module -module-name LocalTypes -o %t/LocalTypes.swiftmodule %s
+// RUN: %target-swift-ide-test -swift-version 3 -print-local-types -I %t -module-to-print LocalTypes -source-filename %s | %FileCheck %s
 
 public func singleFunc() {
   // CHECK-DAG: 10LocalTypes10singleFuncyyF06SingleD6StructL_V

test/IDE/merge_local_types.swift

@@ -3,9 +3,9 @@
 // RUN: rm -rf %t && mkdir -p %t
 
 // Create separate modules and merge them together
-// RUN: %target-swiftc_driver -v -emit-module -module-name LocalTypesMerged -o %t/LocalTypesMerged.swiftmodule %s %S/local_types.swift
+// RUN: %target-swiftc_driver -swift-version 3 -v -emit-module -module-name LocalTypesMerged -o %t/LocalTypesMerged.swiftmodule %s %S/local_types.swift
 
-// RUN: %target-swift-ide-test -print-local-types -I %t -module-to-print LocalTypesMerged -source-filename %s | %FileCheck %s
+// RUN: %target-swift-ide-test -swift-version 3 -print-local-types -I %t -module-to-print LocalTypesMerged -source-filename %s | %FileCheck %s
 
 public func toMerge() {
   // CHECK-DAG: 16LocalTypesMerged7toMergeyyF16SingleFuncStructL_V

test/Serialization/Recovery/crash-recovery.swift

@@ -14,7 +14,7 @@ public class Sub: Base {
 
 // CHECK-CRASH: error: fatal error encountered while reading from module 'Lib'; please file a bug report with your project and the crash log
 // CHECK-CRASH-3-NOT: note
-// CHECK-CRASH-4: note: compiling as Swift 4.0, with 'Lib' built as Swift 3.1
+// CHECK-CRASH-4: note: compiling as Swift 4.0, with 'Lib' built as Swift 3.2
 // CHECK-CRASH-LABEL: *** DESERIALIZATION FAILURE (please include this section in any bug report) ***
 // CHECK-CRASH: could not find 'disappearingMethod()' in parent class
 // CHECK-CRASH: While loading members for 'Sub' in module 'Lib'

test/lit.cfg

@@ -768,8 +768,9 @@ elif run_os in ['linux-gnu', 'linux-gnueabihf', 'freebsd', 'windows-cygnus', 'wi
         % (config.swiftc, config.variant_triple, resource_dir_opt, mcp_opt,
            config.swift_test_options, swift_execution_tests_extra_flags))
     config.target_swift_frontend = (
-        '%s -frontend -target %s %s %s'
-        % (config.swift, config.variant_triple, resource_dir_opt, mcp_opt))
+        '%s -frontend -target %s %s %s %s'
+        % (config.swift, config.variant_triple, resource_dir_opt, mcp_opt,
+        config.swift_test_options))
     subst_target_swift_frontend_mock_sdk = config.target_swift_frontend
     subst_target_swift_frontend_mock_sdk_after = ""
     config.target_run = ''
@@ -1019,10 +1020,11 @@ config.substitutions.append(('%target-sil-llvm-gen', config.target_sil_llvm_gen)
 config.substitutions.append(('%target-sil-nm', config.target_sil_nm))
 config.substitutions.append(
     ('%target-swift-ide-test\(mock-sdk:([^)]+)\)',
-     '%s \\1 %s' %
+     '%s \\1 %s -swift-version %s' %
      (subst_target_swift_ide_test_mock_sdk,
-      subst_target_swift_ide_test_mock_sdk_after)))
-config.substitutions.append(('%target-swift-ide-test', config.target_swift_ide_test))
+      subst_target_swift_ide_test_mock_sdk_after,
+      swift_version)))
+config.substitutions.append(('%target-swift-ide-test', "%s -swift-version %s" % (config.target_swift_ide_test, swift_version)))
 config.substitutions.append(('%target-swift-reflection-test', lit.util.which('swift-reflection-test{variant_suffix}'.format(variant_suffix=config.variant_suffix), config.environment['PATH'])))
 config.substitutions.append(('%target-swift-reflection-dump', '{} {} {}'.format(config.swift_reflection_dump, '-arch', run_cpu)))
 config.substitutions.append(('%target-swiftc_driver', config.target_swiftc_driver))

test/stdlib/NSStringAPI.swift

@@ -1,4 +1,4 @@
-// RUN: %target-run-simple-swift
+// RUN: %target-run-simple-swift -swift-version 3
 // REQUIRES: executable_test
 
 // REQUIRES: objc_interop

test/stdlib/TestUUID.swift

@@ -74,7 +74,7 @@ class TestUUID : TestUUIDSuper {
         let valFromRef = ref as UUID
         var bytes: [UInt8] = [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]
         let valFromBytes = bytes.withUnsafeMutableBufferPointer { buffer -> UUID in
-            ref.getBytes(buffer.baseAddress)
+            ref.getBytes(buffer.baseAddress!)
             return UUID(uuid: UnsafeRawPointer(buffer.baseAddress!).load(as: uuid_t.self))
         }
         let valFromStr = UUID(uuidString: ref.uuidString)

tools/swift-ide-test/swift-ide-test.cpp

@@ -245,7 +245,7 @@ SDK("sdk", llvm::cl::desc("path to the SDK to build against"),
 static llvm::cl::opt<std::string>
 Triple("target", llvm::cl::desc("target triple"), llvm::cl::cat(Category));
 
-static llvm::cl::opt<std::string>
+static llvm::cl::list<std::string>
 SwiftVersion("swift-version", llvm::cl::desc("Swift version"),
              llvm::cl::cat(Category));
 
@@ -2979,8 +2979,11 @@ int main(int argc, char *argv[]) {
   if (!options::Triple.empty())
     InitInvok.setTargetTriple(options::Triple);
   if (!options::SwiftVersion.empty()) {
+    // Honor the *last* -swift-version specified.
+    const auto &LastSwiftVersion =
+      options::SwiftVersion[options::SwiftVersion.size()-1];
     if (auto swiftVersion =
-          version::Version::parseVersionString(options::SwiftVersion,
+          version::Version::parseVersionString(LastSwiftVersion,
                                                SourceLoc(), nullptr)) {
       if (auto actual = swiftVersion.getValue().getEffectiveLanguageVersion())
         InitInvok.getLangOptions().EffectiveLanguageVersion = actual.getValue();

utils/build-script

@@ -2044,7 +2044,7 @@ iterations with -O",
         "--swift-user-visible-version",
         help="User-visible version of the embedded Swift compiler",
         type=arguments.type.swift_compiler_version,
-        default="3.1",
+        default="4.0",
         metavar="MAJOR.MINOR")
 
     parser.add_argument(