Snapshot DDC trained on itself

utils/dartdevc/BUILD.gn

Index: utils/dartdevc/BUILD.gn
diff --git a/utils/dartdevc/BUILD.gn b/utils/dartdevc/BUILD.gn
index ba51ab4eed24cb2c63a131a29e4c57baa0ded2e6..6eacb96cb857c29e0f294318352d6b6626d41edf 100644
--- a/utils/dartdevc/BUILD.gn
+++ b/utils/dartdevc/BUILD.gn
@@ -5,16 +5,20 @@
 import("../application_snapshot.gni")
 
 application_snapshot("dartdevc") {
-  main_dart = "../../pkg/dev_compiler/bin/dartdevc.dart"
+  main_dart = "//pkg/dev_compiler/bin/dartdevc.dart"
   training_args = [
     "--dart-sdk",
-    rebase_path("../../sdk"),
+    rebase_path("//sdk"),
     "--dart-sdk-summary",
-    rebase_path("../../pkg/dev_compiler/lib/sdk/ddc_sdk.sum"),
-    "--help",
+    rebase_path("//pkg/dev_compiler/lib/sdk/ddc_sdk.sum"),
+    "--library-root",
+    rebase_path("//pkg/dev_compiler"),
+    "-o",
+    "dartdevc.js",
+    rebase_path("//pkg/dev_compiler/bin/dartdevc.dart"),
   ]
   inputs = exec_script("../../tools/list_dart_files.py",
                        [ "absolute",
-                         rebase_path("../../pkg/dev_compiler/bin") ],
+                         rebase_path("//pkg/dev_compiler/bin") ],

[Bob Nystrom, 2017/04/21 22:43:41]

I like the way absolute paths in GN files look too, but Zach says we shouldn't
use them since some projects (Turquoise?) may use the same GN files with a
different root directory.

[vsm, 2017/04/21 23:20:32]

Done.

                        "list lines")
 }