stdlib: remove swiftMSVCRT, replace with swiftCRT on Windows

This replaces swiftMSVCRT with swiftCRT.  The big difference here is
that the `visualc` module is no longer imported nor exported.  The
`visualc` module remains in use for a singular test wrt availability,
but this should effectively remove the need for the `visualc` module.

The difference between the MSVCRT and ucrt module was not well
understood by most.  MSVCRT provided ucrt AND visualc, combining pieces
of the old MSVCRT and the newer ucrt.  The ucrt module is what you
really wanted most of the time, however, would need to use MSVCRT for
the convenience aliases for type-generic math and the deprecated math
constants.

Unfortunately, we cannot shadow the `ucrt` module and create a Swift SDK
overlay for ucrt as that seems to result in circular dependencies when
processing the `_Concurrency` module.

Although this makes using the C library easier for most people, it has a
more important subtle change: it cleaves the dependency on visualc.
This means that this enables use of Swift without Visual Studio for the
singular purpose of providing 3 header files.  Additionally, it removes
the need for the installation of 2 of the 4 support files.  This greatly
simplifies the deployment process on Windows.

Author: compnerd

stdlib/private/RuntimeUnittest/CMakeLists.txt

@@ -13,7 +13,7 @@ add_swift_target_library(swiftRuntimeUnittest ${SWIFT_STDLIB_LIBRARY_BUILD_TYPES
   SWIFT_MODULE_DEPENDS_OPENBSD Glibc
   SWIFT_MODULE_DEPENDS_CYGWIN Glibc
   SWIFT_MODULE_DEPENDS_HAIKU Glibc
-  SWIFT_MODULE_DEPENDS_WINDOWS MSVCRT
+  SWIFT_MODULE_DEPENDS_WINDOWS CRT
   SWIFT_COMPILE_FLAGS ${swift_stdlib_unittest_compile_flags} ${SWIFT_STANDARD_LIBRARY_SWIFT_FLAGS}
   INSTALL_IN_COMPONENT stdlib-experimental
   DARWIN_INSTALL_NAME_DIR "${SWIFT_DARWIN_STDLIB_PRIVATE_INSTALL_NAME_DIR}")

stdlib/private/StdlibCollectionUnittest/CMakeLists.txt

@@ -24,7 +24,7 @@ add_swift_target_library(swiftStdlibCollectionUnittest ${SWIFT_STDLIB_LIBRARY_BU
   SWIFT_MODULE_DEPENDS_OPENBSD Glibc
   SWIFT_MODULE_DEPENDS_CYGWIN Glibc
   SWIFT_MODULE_DEPENDS_HAIKU Glibc
-  SWIFT_MODULE_DEPENDS_WINDOWS MSVCRT
+  SWIFT_MODULE_DEPENDS_WINDOWS CRT
   SWIFT_COMPILE_FLAGS ${swift_stdlib_unittest_compile_flags} ${SWIFT_STANDARD_LIBRARY_SWIFT_FLAGS}
   INSTALL_IN_COMPONENT stdlib-experimental
   DARWIN_INSTALL_NAME_DIR "${SWIFT_DARWIN_STDLIB_PRIVATE_INSTALL_NAME_DIR}")

stdlib/private/StdlibUnicodeUnittest/CMakeLists.txt

@@ -12,7 +12,7 @@ add_swift_target_library(swiftStdlibUnicodeUnittest ${SWIFT_STDLIB_LIBRARY_BUILD
   SWIFT_MODULE_DEPENDS_OPENBSD Glibc
   SWIFT_MODULE_DEPENDS_CYGWIN Glibc
   SWIFT_MODULE_DEPENDS_HAIKU Glibc
-  SWIFT_MODULE_DEPENDS_WINDOWS MSVCRT
+  SWIFT_MODULE_DEPENDS_WINDOWS CRT
   SWIFT_COMPILE_FLAGS ${swift_stdlib_unittest_compile_flags} ${SWIFT_STANDARD_LIBRARY_SWIFT_FLAGS}
   INSTALL_IN_COMPONENT stdlib-experimental
   DARWIN_INSTALL_NAME_DIR "${SWIFT_DARWIN_STDLIB_PRIVATE_INSTALL_NAME_DIR}")

stdlib/private/StdlibUnittest/CMakeLists.txt

@@ -41,7 +41,7 @@ add_swift_target_library(swiftStdlibUnittest ${SWIFT_STDLIB_LIBRARY_BUILD_TYPES}
   SWIFT_MODULE_DEPENDS_OPENBSD Glibc
   SWIFT_MODULE_DEPENDS_CYGWIN Glibc
   SWIFT_MODULE_DEPENDS_HAIKU Glibc
-  SWIFT_MODULE_DEPENDS_WINDOWS MSVCRT WinSDK
+  SWIFT_MODULE_DEPENDS_WINDOWS CRT WinSDK
   SWIFT_COMPILE_FLAGS ${swift_stdlib_unittest_compile_flags} ${SWIFT_STANDARD_LIBRARY_SWIFT_FLAGS}
   INSTALL_IN_COMPONENT stdlib-experimental
   DARWIN_INSTALL_NAME_DIR "${SWIFT_DARWIN_STDLIB_PRIVATE_INSTALL_NAME_DIR}")

stdlib/private/StdlibUnittest/RaceTest.swift

@@ -44,7 +44,7 @@ import Darwin
 #elseif canImport(Glibc)
 import Glibc
 #elseif os(Windows)
-import MSVCRT
+import CRT
 import WinSDK
 #endif
 

stdlib/private/StdlibUnittest/StdlibCoreExtras.swift

@@ -17,7 +17,7 @@ import Darwin
 #elseif canImport(Glibc)
 import Glibc
 #elseif os(Windows)
-import MSVCRT
+import CRT
 #endif
 
 #if _runtime(_ObjC)

stdlib/private/StdlibUnittest/StdlibUnittest.swift

@@ -21,7 +21,7 @@ import Darwin
 #elseif canImport(Glibc)
 import Glibc
 #elseif os(Windows)
-import MSVCRT
+import CRT
 import WinSDK
 #endif
 

stdlib/private/StdlibUnittest/SymbolLookup.swift

@@ -15,7 +15,7 @@
 #elseif canImport(Glibc)
   import Glibc
 #elseif os(Windows)
-  import MSVCRT
+  import CRT
   import WinSDK
 #else
 #error("Unsupported platform")

stdlib/private/SwiftPrivate/CMakeLists.txt

@@ -15,7 +15,7 @@ add_swift_target_library(swiftSwiftPrivate ${SWIFT_STDLIB_LIBRARY_BUILD_TYPES} I
   GYB_SOURCES
     AtomicInt.swift.gyb
 
-  SWIFT_MODULE_DEPENDS_WINDOWS MSVCRT WinSDK
+  SWIFT_MODULE_DEPENDS_WINDOWS CRT WinSDK
   SWIFT_COMPILE_FLAGS ${swift_swiftprivate_compile_flags} ${SWIFT_STANDARD_LIBRARY_SWIFT_FLAGS}
   INSTALL_IN_COMPONENT stdlib-experimental
   DARWIN_INSTALL_NAME_DIR "${SWIFT_DARWIN_STDLIB_PRIVATE_INSTALL_NAME_DIR}")

stdlib/private/SwiftPrivate/IO.swift

@@ -14,7 +14,7 @@ import Swift
 import SwiftShims
 
 #if os(Windows)
-import MSVCRT
+import CRT
 import WinSDK
 #endif
 

stdlib/private/SwiftPrivateLibcExtras/CMakeLists.txt

@@ -18,6 +18,6 @@ add_swift_target_library(swiftSwiftPrivateLibcExtras ${SWIFT_STDLIB_LIBRARY_BUIL
   SWIFT_MODULE_DEPENDS_OPENBSD Glibc
   SWIFT_MODULE_DEPENDS_CYGWIN Glibc
   SWIFT_MODULE_DEPENDS_HAIKU Glibc
-  SWIFT_MODULE_DEPENDS_WINDOWS MSVCRT WinSDK
+  SWIFT_MODULE_DEPENDS_WINDOWS CRT WinSDK
   INSTALL_IN_COMPONENT stdlib-experimental
   DARWIN_INSTALL_NAME_DIR "${SWIFT_DARWIN_STDLIB_PRIVATE_INSTALL_NAME_DIR}")

stdlib/private/SwiftPrivateLibcExtras/Subprocess.swift

@@ -16,7 +16,7 @@ import Darwin
 #elseif canImport(Glibc)
 import Glibc
 #elseif os(Windows)
-import MSVCRT
+import CRT
 import WinSDK
 #endif
 

stdlib/private/SwiftPrivateLibcExtras/SwiftPrivateLibcExtras.swift

@@ -16,7 +16,7 @@ import Darwin
 #elseif canImport(Glibc)
 import Glibc
 #elseif os(Windows)
-import MSVCRT
+import CRT
 #endif
 
 public func _stdlib_mkstemps(_ template: inout String, _ suffixlen: CInt) -> CInt {

stdlib/private/SwiftPrivateThreadExtras/CMakeLists.txt

@@ -15,7 +15,7 @@ add_swift_target_library(swiftSwiftPrivateThreadExtras ${SWIFT_STDLIB_LIBRARY_BU
   SWIFT_MODULE_DEPENDS_OPENBSD Glibc
   SWIFT_MODULE_DEPENDS_CYGWIN Glibc
   SWIFT_MODULE_DEPENDS_HAIKU Glibc
-  SWIFT_MODULE_DEPENDS_WINDOWS MSVCRT WinSDK
+  SWIFT_MODULE_DEPENDS_WINDOWS CRT WinSDK
   SWIFT_COMPILE_FLAGS ${SWIFT_STANDARD_LIBRARY_SWIFT_FLAGS}
   TARGET_SDKS ALL_APPLE_PLATFORMS CYGWIN FREEBSD OPENBSD HAIKU LINUX WINDOWS ANDROID
   INSTALL_IN_COMPONENT stdlib-experimental

stdlib/private/SwiftPrivateThreadExtras/SwiftPrivateThreadExtras.swift

@@ -20,7 +20,7 @@ import Darwin
 #elseif canImport(Glibc)
 import Glibc
 #elseif os(Windows)
-import MSVCRT
+import CRT
 import WinSDK
 #endif
 

stdlib/private/SwiftPrivateThreadExtras/ThreadBarriers.swift

@@ -15,7 +15,7 @@ import Darwin
 #elseif canImport(Glibc)
 import Glibc
 #elseif os(Windows)
-import MSVCRT
+import CRT
 import WinSDK
 #endif
 

stdlib/private/SwiftReflectionTest/CMakeLists.txt

@@ -9,7 +9,7 @@ if (SWIFT_INCLUDE_TESTS)
     SWIFT_MODULE_DEPENDS_TVOS Darwin
     SWIFT_MODULE_DEPENDS_WATCHOS Darwin
     SWIFT_MODULE_DEPENDS_LINUX Glibc
-    SWIFT_MODULE_DEPENDS_WINDOWS MSVCRT
+    SWIFT_MODULE_DEPENDS_WINDOWS CRT
     INSTALL_IN_COMPONENT stdlib-experimental
     DARWIN_INSTALL_NAME_DIR "${SWIFT_DARWIN_STDLIB_PRIVATE_INSTALL_NAME_DIR}")
 

stdlib/public/Concurrency/CMakeLists.txt

@@ -25,7 +25,7 @@ add_swift_target_library(swift_Concurrency ${SWIFT_STDLIB_LIBRARY_BUILD_TYPES} I
   SWIFT_MODULE_DEPENDS_OPENBSD Glibc
   SWIFT_MODULE_DEPENDS_CYGWIN Glibc
   SWIFT_MODULE_DEPENDS_HAIKU Glibc
-  SWIFT_MODULE_DEPENDS_WINDOWS MSVCRT
+  SWIFT_MODULE_DEPENDS_WINDOWS CRT
 
   LINK_LIBRARIES swiftCore
 

stdlib/public/Differentiation/CMakeLists.txt

@@ -32,7 +32,7 @@ add_swift_target_library(swift_Differentiation ${SWIFT_STDLIB_LIBRARY_BUILD_TYPE
   SWIFT_MODULE_DEPENDS_OPENBSD Glibc
   SWIFT_MODULE_DEPENDS_CYGWIN Glibc
   SWIFT_MODULE_DEPENDS_HAIKU Glibc
-  SWIFT_MODULE_DEPENDS_WINDOWS MSVCRT
+  SWIFT_MODULE_DEPENDS_WINDOWS CRT
 
   SWIFT_COMPILE_FLAGS
     ${SWIFT_STANDARD_LIBRARY_SWIFT_FLAGS}

stdlib/public/Differentiation/TgmathDerivatives.swift.gyb

@@ -19,7 +19,7 @@ import Swift
 #elseif os(Linux) || os(FreeBSD) || os(OpenBSD) || os(PS4) || os(Android) || os(Cygwin) || os(Haiku)
   import Glibc
 #elseif os(Windows)
-  import MSVCRT
+  import CRT
 #else
 #error("Unsupported platform")
 #endif

stdlib/public/Platform/CMakeLists.txt

@@ -48,8 +48,8 @@ add_swift_target_library(swiftGlibc ${SWIFT_STDLIB_LIBRARY_BUILD_TYPES} IS_SDK_O
     INSTALL_IN_COMPONENT sdk-overlay
     DEPENDS glibc_modulemap)
 
-add_swift_target_library(swiftMSVCRT ${SWIFT_STDLIB_LIBRARY_BUILD_TYPES} IS_SDK_OVERLAY
-    msvcrt.swift
+add_swift_target_library(swiftCRT ${SWIFT_STDLIB_LIBRARY_BUILD_TYPES} IS_SDK_OVERLAY
+    ucrt.swift
     ${swift_platform_sources}
     POSIXError.swift
 

stdlib/public/Platform/Platform.swift

@@ -13,10 +13,6 @@
 import SwiftShims
 import SwiftOverlayShims
 
-#if os(Windows)
-import ucrt
-#endif
-
 #if os(macOS) || os(iOS) || os(watchOS) || os(tvOS)
 //===----------------------------------------------------------------------===//
 // MacTypes.h

stdlib/public/Platform/msvcrt.swift renamed to stdlib/public/Platform/ucrt.swift

@@ -11,7 +11,6 @@
 //===----------------------------------------------------------------------===//
 
 @_exported import ucrt // Clang module
-@_exported import visualc // Clang module
 
 @available(swift, deprecated: 3.0, message: "Please use 'Double.pi' or '.pi' to get the value of correct type and avoid casting.")
 public let M_PI = Double.pi

test/AutoDiff/stdlib/tgmath_derivatives.swift.gyb

@@ -6,7 +6,7 @@
 #elseif canImport(Glibc)
   import Glibc
 #elseif os(Windows)
-  import MSVCRT
+  import CRT
 #else
 #error("Unsupported platform")
 #endif

test/AutoDiff/validation-test/custom_derivatives.swift

@@ -7,7 +7,7 @@ import StdlibUnittest
 #elseif canImport(Glibc)
   import Glibc
 #elseif os(Windows)
-  import ucrt
+  import CRT
 #else
 #error("Unsupported platform")
 #endif

test/AutoDiff/validation-test/separate_tangent_type.swift

@@ -7,7 +7,7 @@ import StdlibUnittest
 #elseif canImport(Glibc)
   import Glibc
 #elseif os(Windows)
-  import ucrt
+  import CRT
 #else
 #error("Unsupported platform")
 #endif

test/ClangImporter/availability_returns_twice-msvc.swift

@@ -1,7 +1,7 @@
 // RUN: %target-typecheck-verify-swift
 // REQUIRES: OS=windows-msvc
 
-import MSVCRT
+import visualc
 typealias JumpBuffer = _JBTYPE
 
 func test_unavailable_returns_twice_function() {

test/ClangImporter/clang_builtins.swift

@@ -5,7 +5,7 @@
 #elseif canImport(Glibc)
   import Glibc
 #elseif os(Windows)
-  import MSVCRT
+  import CRT
 #else
 #error("Unsupported platform")
 #endif

test/IRGen/builtin_math.swift

@@ -5,7 +5,7 @@
 #elseif canImport(Glibc)
   import Glibc
 #elseif os(Windows)
-  import MSVCRT
+  import CRT
 #else
 #error("Unsupported platform")
 #endif

test/IRGen/sanitize_coverage.swift

@@ -14,7 +14,7 @@
 #elseif canImport(Glibc)
   import Glibc
 #elseif os(Windows)
-  import MSVCRT
+  import CRT
 #else
 #error("Unsupported platform")
 #endif

test/Interpreter/SDK/libc.swift

@@ -14,7 +14,7 @@
 #elseif canImport(Glibc)
   import Glibc
 #elseif os(Windows)
-  import MSVCRT
+  import CRT
 
   let S_IRUSR: Int32 = ucrt._S_IREAD
   let S_IWUSR: Int32 = 0

test/Interpreter/dynamicReplacement_property_observer.swift

@@ -16,7 +16,7 @@
 #elseif canImport(Glibc)
   import Glibc
 #elseif os(Windows)
-  import MSVCRT
+  import CRT
   import WinSDK
 #else
 #error("Unsupported platform")

test/Interpreter/dynamic_replacement.swift

@@ -109,7 +109,7 @@ import StdlibUnittest
 #elseif canImport(Glibc)
   import Glibc
 #elseif os(Windows)
-  import MSVCRT
+  import CRT
   import WinSDK
 #else
 #error("Unsupported platform")

test/Interpreter/dynamic_replacement_chaining.swift

@@ -30,7 +30,7 @@ import StdlibUnittest
 #elseif canImport(Glibc)
   import Glibc
 #elseif os(Windows)
-  import MSVCRT
+  import CRT
   import WinSDK
 #else
 #error("Unsupported platform")

test/Interpreter/dynamic_replacement_without_previous_calls.swift

@@ -16,7 +16,7 @@ import StdlibUnittest
 #elseif canImport(Glibc)
   import Glibc
 #elseif os(Windows)
-  import MSVCRT
+  import CRT
   import WinSDK
 #else
 #error("Unsupported platform")

test/Prototypes/BigInt.swift

@@ -27,7 +27,7 @@ import StdlibUnittest
 #elseif canImport(Glibc)
   import Glibc
 #elseif os(Windows)
-  import MSVCRT
+  import CRT
 #else
 #error("Unsupported platform")
 #endif

test/Sanitizers/tsan.swift

@@ -15,7 +15,7 @@
 #elseif canImport(Glibc)
   import Glibc
 #elseif os(Windows)
-  import MSVCRT
+  import CRT
 #else
 #error("Unsupported platform")
 #endif

test/stdlib/FloatConstants.swift

@@ -5,7 +5,7 @@
 #elseif canImport(Glibc)
   import Glibc
 #elseif os(Windows)
-  import MSVCRT
+  import CRT
 #else
 #error("Unsupported platform")
 #endif

test/stdlib/MathConstants.swift

@@ -5,7 +5,7 @@
 #elseif canImport(Glibc)
   import Glibc
 #elseif os(Windows)
-  import MSVCRT
+  import CRT
 #else
 #error("Unsupported platform")
 #endif

test/stdlib/PrintFloat.swift.gyb

@@ -15,7 +15,7 @@ import StdlibUnittest
 #elseif canImport(Glibc)
   import Glibc
 #elseif os(Windows)
-  import MSVCRT
+  import CRT
 #else
 #error("Unsupported platform")
 #endif

test/stdlib/Runtime.swift.gyb

@@ -15,7 +15,7 @@ import SwiftShims
 #elseif canImport(Glibc)
   import Glibc
 #elseif os(Windows)
-  import MSVCRT
+  import CRT
   import WinSDK
 #else
 #error("Unsupported platform")

test/stdlib/VarArgs.swift

@@ -10,7 +10,7 @@ import Swift
   import Glibc
   typealias CGFloat = Double
 #elseif os(Windows)
-  import MSVCRT
+  import CRT
   #if arch(x86_64) || arch(arm64)
     typealias CGFloat = Double
   #else

test/stdlib/tgmath.swift.gyb

@@ -22,7 +22,7 @@
 #elseif canImport(Glibc)
   import Glibc
 #elseif os(Windows)
-  import MSVCRT
+  import CRT
 #else
 #error("Unsupported platform")
 #endif

test/stdlib/tgmath_optimized.swift

@@ -9,7 +9,7 @@
 #elseif canImport(Glibc)
   import Glibc
 #elseif os(Windows)
-  import MSVCRT
+  import CRT
 #else
 #error("Unsupported platform")
 #endif