Roll back to watchOS 6.0 to keep armv7k support

While the swift compiler in Xcode links against tbd files in the sdk
that contain an armv7k slice, the open source swift toolchain links
against the stdlib dylb that is in the toolchain itself. This means that
we cannot drop support for armv7k support in the stdlib dylib without
losing support for building armv7k when back deploying to older watch
targets. For now, roll back the recent deployment target bump from 9.0
to 6.0 so that we keep armv7k and i386 simulator.

rdar://135560598

Author: benlangmuir

CMakeLists.txt

@@ -572,7 +572,7 @@ set(SWIFT_DARWIN_DEPLOYMENT_VERSION_IOS "16.0" CACHE STRING
 set(SWIFT_DARWIN_DEPLOYMENT_VERSION_TVOS "16.0" CACHE STRING
     "Minimum deployment target version for tvOS")
 
-set(SWIFT_DARWIN_DEPLOYMENT_VERSION_WATCHOS "9.0" CACHE STRING
+set(SWIFT_DARWIN_DEPLOYMENT_VERSION_WATCHOS "6.0" CACHE STRING
     "Minimum deployment target version for watchOS")
 
 set(SWIFT_DARWIN_DEPLOYMENT_VERSION_XROS "1.0" CACHE STRING

benchmark/cmake/modules/AddSwiftBenchmarkSuite.cmake

@@ -113,7 +113,7 @@ macro(configure_sdks_darwin)
   set(macosx_ver "13.0")
   set(iphoneos_ver "16.0")
   set(appletvos_ver "16.0")
-  set(watchos_ver "9.0")
+  set(watchos_ver "6.0")
 
   set(macosx_vendor "apple")
   set(iphoneos_vendor "apple")

utils/build-script-impl

@@ -104,7 +104,7 @@ KNOWN_SETTINGS=(
     darwin-deployment-version-ios                 "16.0"            "minimum deployment target version for iOS"
     darwin-deployment-version-osx                 "13.0"            "minimum deployment target version for OS X"
     darwin-deployment-version-tvos                "16.0"            "minimum deployment target version for tvOS"
-    darwin-deployment-version-watchos             "9.0"             "minimum deployment target version for watchOS"
+    darwin-deployment-version-watchos             "6.0"             "minimum deployment target version for watchOS"
     darwin-deployment-version-xros                "1.0"             "minimum deployment target version for xrOS"
     darwin-install-extract-symbols                ""                "whether to extract symbols with dsymutil during installations"
     darwin-install-extract-symbols-use-just-built-dsymutil "1"       "whether we should extract symbols using the just built dsymutil"

utils/build_swift/build_swift/defaults.py

@@ -55,7 +55,9 @@
 DARWIN_DEPLOYMENT_VERSION_OSX = '13.0'
 DARWIN_DEPLOYMENT_VERSION_IOS = '16.0'
 DARWIN_DEPLOYMENT_VERSION_TVOS = '16.0'
-DARWIN_DEPLOYMENT_VERSION_WATCHOS = '9.0'
+# FIXME: 9.0 would be the aligned watchOS version, but is held back to keep
+# support for armv7k (dropped in 9) and i386 simulator (dropped in 7)
+DARWIN_DEPLOYMENT_VERSION_WATCHOS = '6.0'
 DARWIN_DEPLOYMENT_VERSION_XROS = '1.0'
 
 UNIX_INSTALL_PREFIX = '/usr'

utils/gyb_foundation_support.py

@@ -12,7 +12,7 @@ def ObjectiveCBridgeableImplementationForNSValue(Type):
                         _getObjCTypeEncoding({Type}.self)) == 0,
                  "NSValue does not contain the right type to bridge to {Type}")
     result = {Type}()
-    if #available(OSX 13.0, iOS 16.0, tvOS 16.0, watchOS 9.0, *) {{
+    if #available(OSX 13.0, iOS 16.0, tvOS 16.0, watchOS 6.0, *) {{
       source.getValue(&result!, size: MemoryLayout<{Type}>.size)
     }} else {{
       source.getValue(&result!)
@@ -27,7 +27,7 @@ def ObjectiveCBridgeableImplementationForNSValue(Type):
       return false
     }}
     result = {Type}()
-    if #available(OSX 13.0, iOS 16.0, tvOS 16.0, watchOS 9.0, *) {{
+    if #available(OSX 13.0, iOS 16.0, tvOS 16.0, watchOS 6.0, *) {{
       source.getValue(&result!, size: MemoryLayout<{Type}>.size)
     }} else {{
       source.getValue(&result!)
@@ -42,7 +42,7 @@ def ObjectiveCBridgeableImplementationForNSValue(Type):
                         _getObjCTypeEncoding({Type}.self)) == 0,
                  "NSValue does not contain the right type to bridge to {Type}")
     var result = {Type}()
-    if #available(OSX 13.0, iOS 16.0, tvOS 16.0, watchOS 9.0, *) {{
+    if #available(OSX 13.0, iOS 16.0, tvOS 16.0, watchOS 6.0, *) {{
       unwrappedSource.getValue(&result, size: MemoryLayout<{Type}>.size)
     }} else {{
       unwrappedSource.getValue(&result)