Generate a static struct from fieldtrial_testing_config

chrome/common/variations/BUILD.gn

+# Copyright 2015 The Chromium Authors. 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/config/ui.gni")
+
+component("fieldtrial_testing_config") {

[brettw, 2015/07/10 19:49:04]

Delete this, actions are separate targets in GN. It's a bug in GN that it allows
you to nest targets.

+  action("fieldtrial_testing_config_action") {
+    visibility = [ ":fieldtrial_testing_config" ]
+    script = "//tools/variations/fieldtrial_to_struct.py"
+
+    if (is_win) {
+      source = "//testing/variations/fieldtrial_testing_config_win.json"
+    }
+    if (is_mac) {
+      source = "//testing/variations/fieldtrial_testing_config_mac.json"
+    }
+    if (is_linux) {
+      source = "//testing/variations/fieldtrial_testing_config_linux.json"
+    }
+    if (is_chromeos) {
+      source = "//testing/variations/fieldtrial_testing_config_chromeos.json"
+    }
+    if (is_android) {
+      source = "//testing/variations/fieldtrial_testing_config_android.json"
+    }
+    if (is_ios) {
+      source = "//testing/variations/fieldtrial_testing_config_ios.json"
+    }
+
+    inputs = [
+      "//tools/json_to_struct/element_generator.py",
+      "//tools/json_to_struct/json_to_struct.py",
+      "//tools/json_to_struct/struct_generator.py",
+      source,
+    ]
+    out_dir = get_path_info("variations", "gen_dir")

[brettw, 2015/07/10 19:49:04]

This get_path_info will return
"//out/foo/gen/chrome/common/variations/variations" which isn't what you want
(you're resolving the file "variations" against the current directory).

What you want is just the builtin variable target_gen_dir. You can delete your
out_dir variable altogether.

[danduong, 2015/07/10 22:41:37]

Done.

+    out_name = "fieldtrial_testing_config"
+    outputs = [
+      "$out_dir/$out_name.cc",
+      "$out_dir/$out_name.h",
+    ]
+
+    args = [
+      rebase_path(source, root_build_dir),
+      "--destbase=" + rebase_path(out_dir, root_build_dir),
+      "--namespace=chrome_variations",
+      "--schema=" +
+          rebase_path("fieldtrial_testing_config_schema.json", root_build_dir),
+      "--output=$out_name",
+    ]
+  }
+
+  visibility = [ "*" ]

[brettw, 2015/07/10 19:49:04]

Delete this.

[danduong, 2015/07/10 22:41:36]

Done.

+  sources = get_target_outputs(":fieldtrial_testing_config_action")

[brettw, 2015/07/10 19:49:04]

Before here, start a new target:
  source_set("fieldtrial_testing_config") {
component is unnecessary (you don't want this to be a shared library).

[danduong, 2015/07/10 22:41:36]

Done.

+  deps = [
+    ":fieldtrial_testing_config_action",
+  ]
+}