[fuchsia] Prepare for setting the Dart target architecture appropriately in the host binaries.

runtime/bin/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("gypi_contents.gni")
 import("../runtime_args.gni")
 import("../../build/compiled_action.gni")
 
 declare_args() {
   # Controls the kind of core snapshot linked into the standalone VM. Using a
@@ skipping 678 matching lines @@
     "../observatory:standalone_observatory_archive",
   ]
   extra_sources = [
     "builtin_nolib.cc",
     "snapshot_empty.cc",
     "loader.cc",
     "loader.h",
   ]
 }
 
-dart_executable("dart_bootstrap") {
-  extra_configs = [
-    "..:dart_precompiler_config",
-    "..:dart_no_snapshot_config",
-  ]
-  extra_deps = [
-    ":generate_builtin_cc_file",
-    ":generate_io_cc_file",
-    ":generate_io_patch_cc_file",
-    ":generate_html_cc_file",
-    ":generate_html_common_cc_file",
-    ":generate_js_cc_file",
-    ":generate_js_util_cc_file",
-    ":generate_blink_cc_file",
-    ":generate_indexed_db_cc_file",
-    ":generate_cached_patches_cc_file",
-    ":generate_web_gl_cc_file",
-    ":generate_metadata_cc_file",
-    ":generate_web_sql_cc_file",
-    ":generate_svg_cc_file",
-    ":generate_web_audio_cc_file",
-    "..:libdart_nosnapshot_with_precompiler",
-  ]
-  extra_defines = [ "NO_OBSERVATORY" ]
-  extra_sources = [
-    "builtin.cc",
-    "builtin.h",
-    "dfe.cc",
-    "dfe.h",
-    "loader.cc",
-    "loader.h",
-    "observatory_assets_empty.cc",
-    "snapshot_empty.cc",
+template("dart_bootstrap_template") {
+  invoker_extra_configs = []
+  if (defined(invoker.extra_configs)) {
+    invoker_extra_configs += invoker.extra_configs
+  }
+  dart_executable(target_name) {
+    extra_configs = [
+                      "..:dart_precompiler_config",
+                      "..:dart_no_snapshot_config",
+                    ] + invoker_extra_configs
+    extra_deps = [
+      ":generate_builtin_cc_file",
+      ":generate_io_cc_file",
+      ":generate_io_patch_cc_file",
+      ":generate_html_cc_file",
+      ":generate_html_common_cc_file",
+      ":generate_js_cc_file",
+      ":generate_js_util_cc_file",
+      ":generate_blink_cc_file",
+      ":generate_indexed_db_cc_file",
+      ":generate_cached_patches_cc_file",
+      ":generate_web_gl_cc_file",
+      ":generate_metadata_cc_file",
+      ":generate_web_sql_cc_file",
+      ":generate_svg_cc_file",
+      ":generate_web_audio_cc_file",
+      "..:libdart_nosnapshot_with_precompiler",
+    ]
+    extra_defines = [ "NO_OBSERVATORY" ]
+    extra_sources = [
+      "builtin.cc",
+      "builtin.h",
+      "dfe.cc",
+      "dfe.h",
+      "loader.cc",
+      "loader.h",
+      "observatory_assets_empty.cc",
+      "snapshot_empty.cc",
 
-    # Include generated source files.
-    "$target_gen_dir/builtin_gen.cc",
-    "$target_gen_dir/io_gen.cc",
-    "$target_gen_dir/io_patch_gen.cc",
-    "$target_gen_dir/html_gen.cc",
-    "$target_gen_dir/html_common_gen.cc",
-    "$target_gen_dir/js_gen.cc",
-    "$target_gen_dir/js_util_gen.cc",
-    "$target_gen_dir/blink_gen.cc",
-    "$target_gen_dir/indexed_db_gen.cc",
-    "$target_gen_dir/cached_patches_gen.cc",
-    "$target_gen_dir/web_gl_gen.cc",
-    "$target_gen_dir/metadata_gen.cc",
-    "$target_gen_dir/web_sql_gen.cc",
-    "$target_gen_dir/svg_gen.cc",
-    "$target_gen_dir/web_audio_gen.cc",
-  ]
+      # Include generated source files.
+      "$target_gen_dir/builtin_gen.cc",
+      "$target_gen_dir/io_gen.cc",
+      "$target_gen_dir/io_patch_gen.cc",
+      "$target_gen_dir/html_gen.cc",
+      "$target_gen_dir/html_common_gen.cc",
+      "$target_gen_dir/js_gen.cc",
+      "$target_gen_dir/js_util_gen.cc",
+      "$target_gen_dir/blink_gen.cc",
+      "$target_gen_dir/indexed_db_gen.cc",
+      "$target_gen_dir/cached_patches_gen.cc",
+      "$target_gen_dir/web_gl_gen.cc",
+      "$target_gen_dir/metadata_gen.cc",
+      "$target_gen_dir/web_sql_gen.cc",
+      "$target_gen_dir/svg_gen.cc",
+      "$target_gen_dir/web_audio_gen.cc",
+    ]
+  }
+}
+
+dart_bootstrap_template("dart_bootstrap") {
+  extra_configs = [ "..:dart_use_target_arch_config" ]
+}
+
+# TODO(rmacnak): Remove if Fuchsia adds a checked-in SDK.
+dart_bootstrap_template("dart_bootstrap_host_arch") {
+  extra_configs = []
 }
 
 if (is_fuchsia) {
   hello_fuchsia_source = rebase_path("../tests/vm/dart/hello_fuchsia_test.dart")
 
   copy("hello_fuchsia") {
     sources = [
       hello_fuchsia_source,
     ]
     outputs = [
@@ skipping 164 matching lines @@
   ]
   if (is_linux || is_android) {
     cflags = [ "-fPIC" ]
   }
   if (is_win) {
     libs = [ "dart.lib" ]
     abs_root_out_dir = rebase_path(root_out_dir)
     ldflags = [ "/LIBPATH:$abs_root_out_dir" ]
   }
 }