Bump the compiler version to 4.2 (and 3.4) (#13767)

https://swift.org/blog/4-2-release-process/

Author: jrose-apple

CMakeLists.txt

@@ -128,7 +128,7 @@ set_property(CACHE SWIFT_ANALYZE_CODE_COVERAGE PROPERTY
 # SWIFT_VERSION is deliberately /not/ cached so that an existing build directory
 # can be reused when a new version of Swift comes out (assuming the user hasn't
 # manually set it as part of their own CMake configuration).
-set(SWIFT_VERSION "4.1")
+set(SWIFT_VERSION "4.2")
 
 set(SWIFT_VENDOR "" CACHE STRING
     "The vendor name of the Swift compiler")

lib/Basic/Version.cpp

@@ -319,9 +319,9 @@ Optional<Version> Version::getEffectiveLanguageVersion() const {
   switch (Components[0]) {
   case 3:
 #ifdef SWIFT_VERSION_PATCHLEVEL
-    return Version{3, 3, SWIFT_VERSION_PATCHLEVEL};
+    return Version{3, 4, SWIFT_VERSION_PATCHLEVEL};
 #else
-    return Version{3, 3};
+    return Version{3, 4};
 #endif
   case 4:
     static_assert(SWIFT_VERSION_MAJOR == 4,

test/Parse/ConditionalCompilation/language_version_explicit.swift

@@ -21,10 +21,19 @@
   asdf asdf asdf asdf
 #endif
 
-#if swift(>=4.0.1)
-  let z = 1
+// NOTE: Please modify this condition...
+#if swift(>=4.2)
+  let b = 1
 #else
   // This shouldn't emit any diagnostics.
   asdf asdf asdf asdf
 #endif
 
+// NOTE: ...and modify this condition...
+#if swift(>=4.2.1)
+  // This shouldn't emit any diagnostics.
+  asdf asdf asdf asdf
+#else
+  let c = 1
+#endif
+// NOTE: ...the next time the version goes up.

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 4.1, with 'Lib' built as Swift 3.3
+// CHECK-CRASH-4: note: compiling as Swift 4.2, with 'Lib' built as Swift 3.4
 // 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/Serialization/Recovery/types-4-to-3.swift

@@ -16,8 +16,8 @@ import Lib
 func requiresConformance(_: B_RequiresConformance<B_ConformsToProto>) {}
 func requiresConformance(_: B_RequiresConformance<C_RelyOnConformanceImpl.Assoc>) {}
 
-class Sub: Base {} // expected-error {{cannot inherit from class 'Base' (compiled with Swift 4.1) because it has overridable members that could not be loaded in Swift 3.3}}
-class Impl: Proto {} // expected-error {{type 'Impl' cannot conform to protocol 'Proto' (compiled with Swift 4.1) because it has requirements that could not be loaded in Swift 3.3}}
+class Sub: Base {} // expected-error {{cannot inherit from class 'Base' (compiled with Swift 4.2) because it has overridable members that could not be loaded in Swift 3.4}}
+class Impl: Proto {} // expected-error {{type 'Impl' cannot conform to protocol 'Proto' (compiled with Swift 4.2) because it has requirements that could not be loaded in Swift 3.4}}
 
 #else // TEST
 

utils/build_swift/defaults.py

@@ -40,7 +40,7 @@
 CMAKE_GENERATOR = 'Ninja'
 
 COMPILER_VENDOR = 'none'
-SWIFT_USER_VISIBLE_VERSION = CompilerVersion('4.1')
+SWIFT_USER_VISIBLE_VERSION = CompilerVersion('4.2')
 CLANG_USER_VISIBLE_VERSION = CompilerVersion('5.0.0')
 SWIFT_ANALYZE_CODE_COVERAGE = 'false'