(DO NOT LAND) Example GN solution for C++ 101 Exercise 0 (Hello world).

base/BUILD.gn

 # Copyright (c) 2013 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.
 
 # HOW TO WRITE CONDITIONALS IN THIS FILE
 # ======================================
 #
 # In many other places, one would write a conditional that expresses all the
 # cases when a source file is used or unused, and then either add or subtract
 # it from the sources list in that case
@@ skipping 1734 matching lines @@
   ]
   deps = [
     ":base",
     ":i18n",
     "//base/test:test_support",
     "//base/test:test_support_perf",
     "//testing/gtest",
   ]
 }
 
+executable("hello_world") {
+  sources = [
+    "cpp101/hello_world.cc",
+  ]
+  deps = [
+    ":base",
+  ]
+}
+
 if (!is_ios) {
   executable("build_utf8_validator_tables") {
     sources = [
       "i18n/build_utf8_validator_tables.cc",
     ]
     deps = [
       ":base",
       "//build/config/sanitizers:deps",
       "//build/win:default_exe_manifest",
       "//third_party/icu:icuuc",
@@ skipping 891 matching lines @@
 }
 
 fuzzer_test("base_json_correctness_fuzzer") {
   sources = [
     "json/correctness_fuzzer.cc",
   ]
   deps = [
     ":base",
   ]
 }