GN: change the way we specify dependencies for the patched_sdk target.

runtime/vm/BUILD.gn

 # Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 import("../../build/executable_suffix.gni")
 import("../../build/prebuilt_dart_sdk.gni")
 import("gypi_contents.gni")
 import("../runtime_args.gni")
 
 config("libdart_vm_config") {
@@ skipping 351 matching lines @@
       "--output",
       rebase_path(output, root_build_dir),
     ]
   }
 }
 
 template("generate_patched_sdk") {
   assert(defined(invoker.libraries), "Need libraries in $target_name")
 
   concatenation_target_names = []
-  concatenation_files = []
 
   # Concatenate vm library patches.
   foreach(library, invoker.libraries) {
     name = library[0]
 
     target_output = "$target_gen_dir/patches/${name}_patch.dart"
     concatenate_patch("concatenate_${name}_patch") {
       libsources = rebase_path(library[1], ".", library[2])
       output = target_output
     }
     concatenation_target_names += [ ":concatenate_${name}_patch" ]
-    concatenation_files += [ target_output ]
   }
 
   # Build the patched sdk out of the concatenated patches and the special
   # libraries.
   action(target_name) {
     deps = concatenation_target_names
     if (!prebuilt_dart_exe_works) {
       deps += [ "../bin:dart_bootstrap($host_toolchain)" ]
     }
 
     patches_dir = "$target_gen_dir/patches"
     patched_sdk_dir = "$root_out_dir/patched_sdk"
 
     script = "../../tools/patch_sdk.py"
 
-    # We list all files which make up the sdk (modulo patches) and get them
-    # back as a GN list object.
-    shared_sdk_sources = exec_script("../../tools/list_dart_files.py",
-                                     [
-                                       "absolute",
-                                       rebase_path("../../sdk/lib"),
-                                     ],
-                                     "list lines")
-
-    front_end_sources = exec_script("../../tools/list_dart_files.py",
-                                    [
-                                      "absolute",
-                                      rebase_path("../../pkg/front_end"),
-                                    ],
-                                    "list lines")
-
-    kernel_sources = exec_script("../../tools/list_dart_files.py",
-                                 [
-                                   "absolute",
-                                   rebase_path("../../pkg/kernel"),
-                                 ],
-                                 "list lines")
-
     # We list the `patch_sdk.dart` tool here because the [script] (which is
     # implicitly an input) will call it.
     inputs = [
       "../../tools/patch_sdk.dart",
     ]
-
-    # Files below are not patches, they will not be in [concatenation_files]
-    # but the `patch_sdk.dart` script will copy them into the patched sdk.
-    inputs += [
-      "../bin/builtin.dart",
-      "../bin/vmservice/vmservice_io.dart",
-      "../bin/vmservice/loader.dart",
-      "../bin/vmservice/server.dart",
-    ]
-
-    # Add all the normal sdk sources.
-    inputs += shared_sdk_sources
-
-    # Add all the concatenated patch files.
-    inputs += concatenation_files
-
-    # Add some front-end dependencies
-    inputs += front_end_sources
-    inputs += kernel_sources
+    depfile = "$root_out_dir/patched_sdk.d"
 
     outputs = [
       # Instead of listing all outputs we list a single well-known one.
-      "${patched_sdk_dir}/lib/core/core.dart",
+      "${patched_sdk_dir}/platform.dill",
     ]
 
     args = [ "--quiet" ]
     if (!prebuilt_dart_exe_works) {
       dart_out_dir = get_label_info("../bin:dart_bootstrap($host_toolchain)",
                                     "root_out_dir")
       dart_bootstrap =
           rebase_path("$dart_out_dir/dart_bootstrap$executable_suffix")
       args += [
         "--dart-executable",
@@ skipping 72 matching lines @@
       processed_gypis.vmservice_runtime_sources,
       "../lib",
     ],
     [
       "io",
       processed_gypis.bin_io_sources,
       "../bin",
     ],
   ]
 }