Toward a green tools/build.py -cprecompiler -rdart_precompiled:

tools/precompilation/precompiler.dart

-// Copyright (c) 2015, 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.
-
-library precompiler;
-
-import 'dart:io';
-
-void run(String executable, String arguments, [String workingDirectory]) {
-  print("+ $executable ${arguments.join(' ')}");
-  var result = Process.runSync(executable, arguments,
-                               workingDirectory: workingDirectory);
-  stdout.write(result.stdout);
-  stderr.write(result.stderr);
-  if (result.exitCode != 0) {
-    exit(result.exitCode);
-  }
-}
-
-void main(List<String> args) {
-  var configuration = Platform.environment["DART_CONFIGURATION"];
-
-  var cc, cc_flags, shared, libname;
-  if (Platform.isLinux) {
-    cc = 'gcc';
-    shared = '-shared';
-    libname = 'libprecompiled.so';
-  } else if (Platform.isMacOS) {
-    cc = 'clang';
-    shared = '-dynamiclib';
-    libname = 'libprecompiled.dylib';
-  } else {
-    print("Test only supports Linux and Mac");
-    return;
-  }
-
-  if (configuration.endsWith("X64")) {
-    cc_flags = "-m64";
-  } else if (configuration.endsWith("SIMARM64")) {
-    cc_flags = "-m64";
-  } else if (configuration.endsWith("SIMARM")) {
-    cc_flags = "-m32";
-  } else if (configuration.endsWith("SIMMIPS")) {
-    cc_flags = "-m32";
-  } else if (configuration.endsWith("ARM")) {
-    cc_flags = "";
-  } else if (configuration.endsWith("MIPS")) {
-    cc_flags = "-EL";
-  } else {
-    print("Architecture not supported: $configuration");
-    return;
-  }
-
-  var tmpDir;
-  for (var arg in args) {
-    if (arg.startsWith("--gen-precompiled-snapshot")) {
-      tmpDir = arg.substring("--gen-precompiled-snapshot".length + 1);
-    }
-  }
-  print("Using directory $tmpDir");
-
-  run(args[0], args.sublist(1));
-  run(cc, [shared, cc_flags, "-o", libname, "precompiled.S"], tmpDir);
-}