Merge pull request swiftlang#255 from apple/build-watchos-armv7k

Only build watchOS project for armv7k <rdar://problem/44522408>

Author: shahmishal

project.py

@@ -124,6 +124,8 @@ def get_build_command(self, incremental=False):
                 command += ['-configuration', value]
             else:
                 command += ['%s=%s' % (setting, value)]
+        if self._destination == 'generic/platform=watchOS':
+            command += ['ARCHS=armv7k']
 
         return command
 

project_future.py

@@ -124,6 +124,9 @@ def get_build_command(self, incremental=False):
                       'SWIFT_TREAT_WARNINGS_AS_ERRORS=NO'])
         command += self._added_xcodebuild_flags
 
+        if self._destination == 'generic/platform=watchOS':
+            command += ['ARCHS=armv7k']
+
         return command
 
     def get_test_command(self, incremental=False):

projects.json

@@ -1500,7 +1500,17 @@
         "project": "ProcedureKit.xcodeproj",
         "target": "ProcedureKit",
         "destination": "generic/platform=watchOS",
-        "configuration": "Release"
+        "configuration": "Release",
+        "xfail": {
+          "compatibility": {
+            "3.0": {
+              "branch": {
+                "master": "https://bugs.swift.org/browse/SR-8780",
+                "swift-4.2-branch": "https://bugs.swift.org/browse/SR-8780"
+              }
+            }
+          }
+        }
       },
       {
         "action": "BuildXcodeProjectTarget",
@@ -1571,7 +1581,17 @@
         "project": "PromiseKit.xcodeproj",
         "target": "PromiseKit",
         "destination": "generic/platform=watchOS",
-        "configuration": "Release"
+        "configuration": "Release",
+        "xfail": {
+          "compatibility": {
+            "4.0.3": {
+              "branch": {
+                "master": "https://bugs.swift.org/browse/SR-8781",
+                "swift-4.2-branch": "https://bugs.swift.org/browse/SR-8781"
+              }
+            }
+          }
+        }
       },
       {
         "action": "BuildXcodeProjectTarget",
@@ -2617,7 +2637,23 @@
         "project": "Mapper.xcodeproj",
         "target": "Mapper",
         "destination": "generic/platform=watchOS",
-        "configuration": "Release"
+        "configuration": "Release",
+        "xfail": {
+          "compatibility": {
+            "4.0": {
+              "branch": {
+                "master": "https://bugs.swift.org/browse/SR-8778",
+                "swift-4.2-branch": "https://bugs.swift.org/browse/SR-8778"
+              }
+            },
+            "4.2": {
+              "branch": {
+                "master": "https://bugs.swift.org/browse/SR-8778",
+                "swift-4.2-branch": "https://bugs.swift.org/browse/SR-8778"
+              }
+            }
+          }
+        }
       },
       {
         "action": "BuildSwiftPackage",