Bump compiler version to Swift 5.1 (#24671)

* Bump version to Swift 5.1

* Update tests with compiler version bump

* Undo flatMap and math obsolescences

Author: tkremenek

CMakeLists.txt

@@ -123,7 +123,7 @@ 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 "5.0")
+set(SWIFT_VERSION "5.1")
 
 set(SWIFT_VENDOR "" CACHE STRING
     "The vendor name of the Swift compiler")

stdlib/public/Platform/tgmath.swift.gyb

@@ -14,7 +14,7 @@ import SwiftShims
 
 // Generic functions implementable directly on FloatingPoint.
 @_transparent
-@available(swift, deprecated: 4.2, obsoleted: 5.1, renamed: "abs")
+@available(swift, deprecated: 4.2/*, obsoleted: 5.1*/, renamed: "abs")
 public func fabs<T: FloatingPoint>(_ x: T) -> T {
   return x.magnitude
 }
@@ -112,7 +112,7 @@ public func isnan<T: FloatingPoint>(_ value: T) -> Bool { fatalError() }
 @available(*, unavailable, message: "use the sign property.")
 public func signbit<T: FloatingPoint>(_ value: T) -> Int { fatalError() }
 
-@available(swift, deprecated: 4.2, obsoleted: 5.1, message: "use the exponent property.")
+@available(swift, deprecated: 4.2/*, obsoleted: 5.1*/, message: "use the exponent property.")
 public func ilogb<T: BinaryFloatingPoint>(_ x: T) -> Int {
   return Int(x.exponent)
 }
@@ -352,7 +352,7 @@ public func remquo(_ x: ${T}, _ y: ${T}) -> (${T}, Int) {
 %  if T == 'Float80':
 #if (arch(i386) || arch(x86_64)) && !os(Windows)
 %  end
-@available(swift, deprecated: 4.2, obsoleted: 5.1, message:
+@available(swift, deprecated: 4.2/*, obsoleted: 5.1*/, message:
            "use ${T}(nan: ${T}.RawSignificand).")
 @_transparent
 public func nan(_ tag: String) -> ${T} {

stdlib/public/core/MigrationSupport.swift

@@ -535,7 +535,7 @@ extension UnsafeMutableRawBufferPointer {
 // Note that the second overload is declared on a more specific protocol.
 // See: test/stdlib/StringFlatMap.swift for tests.
 extension Sequence {
-  @available(swift, deprecated: 4.1, obsoleted: 5.1, renamed: "compactMap(_:)",
+  @available(swift, deprecated: 4.1/*, obsoleted: 5.1 */, renamed: "compactMap(_:)",
     message: "Please use compactMap(_:) for the case where closure returns an optional value")
   public func flatMap<ElementOfResult>(
     _ transform: (Element) throws -> ElementOfResult?

test/IRGen/objc.swift

@@ -147,7 +147,7 @@ class WeakObjC {
 // CHECK:  i32 1, !"Objective-C Version", i32 2}
 // CHECK:  i32 1, !"Objective-C Image Info Version", i32 0}
 // CHECK:  i32 1, !"Objective-C Image Info Section", !"__DATA,__objc_imageinfo,regular,no_dead_strip"}
-//   83887872 == (5 << 24) | (0 << 16) | (7 << 8). 
+//   83953408 == (5 << 24) | (1 << 16) | (7 << 8). 
 //     5 and 0 is the current major.minor version. 7 is the Swift ABI version.
-// CHECK:  i32 4, !"Objective-C Garbage Collection", i32 83887872}
+// CHECK:  i32 4, !"Objective-C Garbage Collection", i32 83953408}
 // CHECK:  i32 1, !"Swift Version", i32 7}

test/Serialization/Recovery/types-5-to-4.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 5.0) because it has overridable members that could not be loaded in Swift 4.1.50}}
-class Impl: Proto {} // expected-error {{type 'Impl' cannot conform to protocol 'Proto' (compiled with Swift 5.0) because it has requirements that could not be loaded in Swift 4.1.50}}
+class Sub: Base {} // expected-error {{cannot inherit from class 'Base' (compiled with Swift 5.1) because it has overridable members that could not be loaded in Swift 4.1.50}}
+class Impl: Proto {} // expected-error {{type 'Impl' cannot conform to protocol 'Proto' (compiled with Swift 5.1) because it has requirements that could not be loaded in Swift 4.1.50}}
 
 #else // TEST
 

test/SourceKit/Misc/compiler_version.swift

@@ -1,5 +1,5 @@
 // RUN: %sourcekitd-test -req=compiler-version | %FileCheck %s
 
 // CHECK: key.version_major: 5
-// CHECK: key.version_minor: 0
+// CHECK: key.version_minor: 1
 // CHECK: key.version_patch: 0

utils/build_swift/defaults.py

@@ -40,7 +40,7 @@
 CMAKE_GENERATOR = 'Ninja'
 
 COMPILER_VENDOR = 'none'
-SWIFT_USER_VISIBLE_VERSION = CompilerVersion('5.0')
+SWIFT_USER_VISIBLE_VERSION = CompilerVersion('5.1')
 CLANG_USER_VISIBLE_VERSION = CompilerVersion('7.0.0')
 SWIFT_ANALYZE_CODE_COVERAGE = 'false'