Do not include pub tests (and generated_pub tests) in the input for creating the sdk.

create_sdk.gyp

Index: create_sdk.gyp
===================================================================
--- create_sdk.gyp	(revision 40135)
+++ create_sdk.gyp	(working copy)
@@ -20,7 +20,14 @@
         {
           'action_name': 'create_sdk_py',
           'inputs': [
-            '<!@(["python", "tools/list_files.py", "\\.dart$", "sdk/lib"])',
+            # This is neccessary because we have all the pub test files inside
+            # the pub directory instead of in tests/pub. Xcode can only handle
+            # a certain amount of files in one list (also depending on the
+            # length of the path from where you run). This regexp excludes
+            # pub/test and pub_generated/test
+            '<!@(["python", "tools/list_files.py",'
+                '"^(?!.*pub/test)(?!.*pub_generated/test).*dart$",'
+                '"sdk/lib"])',
             '<!@(["python", "tools/list_files.py", "", '
                 '"sdk/lib/_internal/compiler/js_lib/preambles"])',
             '<!@(["python", "tools/list_files.py", "", "sdk/bin"])',