Teach ninja to handle output directories outside the source dir.

test/generator-output/gyptest-symlink.py

+#!/usr/bin/env python
+
+# Copyright (c) 2012 Google Inc. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+"""
+Verifies building a target when the --generator-output= option is used to put
+the build configuration files in a separate directory tree referenced by a
+symlink.
+"""
+
+import TestGyp
+import os
+
+# Android doesn't support --generator-output.
+test = TestGyp.TestGyp(formats=['!android'])
+if not hasattr(os, 'symlink'):
+  test.skip_test('Missing os.symlink -- skipping test.\n')
+
+test.writable(test.workpath('src'), False)
+
+test.writable(test.workpath('src/subdir2/deeper/build'), True)
+
+test.subdir(test.workpath('build'))
+test.subdir(test.workpath('build/deeper'))
+test.symlink('build/deeper', test.workpath('symlink'))
+
+test.writable(test.workpath('build/deeper'), True)
+test.run_gyp('deeper.gyp',
+             '-Dset_symroot=2',
+             '--generator-output=' + test.workpath('symlink'),
+             chdir='src/subdir2/deeper')
+
+chdir = 'symlink'
+test.build('deeper.gyp', test.ALL, chdir=chdir)
+
+if test.format == 'xcode':
+  chdir = 'src/subdir2/deeper'
+test.run_built_executable('deeper',
+                          chdir=chdir,
+                          stdout="Hello from deeper.c\n")
+test.pass_test()