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

runtime/bin/BUILD.gn

Index: runtime/bin/BUILD.gn
diff --git a/runtime/bin/BUILD.gn b/runtime/bin/BUILD.gn
index 8d56d3f7b34958db96b428548f2f13c5507b1ee8..57090c6721eea6e78f4112737ad0635d1842b3ee 100644
--- a/runtime/bin/BUILD.gn
+++ b/runtime/bin/BUILD.gn
@@ -749,6 +749,61 @@ dart_executable("dart_bootstrap") {
   ]
 }
 
+# TODO: Remove when Fuchsia has a checked-in SDK.

[zra, 2017/06/12 18:12:18]

ditto

[rmacnak, 2017/06/12 21:10:50]

Done.

+dart_executable("dart_bootstrap_host_arch") {

[zra, 2017/06/12 18:12:18]

Maybe use a dart_bootstrap() template to avoid duplication.

[rmacnak, 2017/06/12 21:10:51]

Done.

+  extra_configs = [
+    "..:dart_precompiler_config",
+    "..:dart_no_snapshot_config",
+    "..:dart_use_target_arch_config",

[zra, 2017/06/12 18:12:18]

Target is called _host_arch, but uses a _target_arch config?

[rmacnak, 2017/06/12 21:10:50]

Yikes, this is backwards and meant to be applied to the plain "dart_bootstrap".

+  ]
+  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_host_arch",
+  ]
+  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",
+  ]
+}
+
 if (is_fuchsia) {
   hello_fuchsia_source = rebase_path("../tests/vm/dart/hello_fuchsia_test.dart")