Add support for the GYP_CROSSCOMPILE env var to MB.

tools/mb/mb_unittest.py

 #!/usr/bin/python
 # Copyright 2015 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.
 
 """Tests for mb.py."""
 
 import json
 import StringIO
 import sys
 import unittest
 
 import mb
 
 
 class FakeMBW(mb.MetaBuildWrapper):
   def __init__(self):
     super(FakeMBW, self).__init__()
     self.files = {}
     self.calls = []
     self.cmds = []
+    self.cross_compile = None
     self.out = ''
     self.err = ''
     self.platform = 'linux2'
     self.chromium_src_dir = '/fake_src'
     self.default_config = '/fake_src/tools/mb/mb_config.pyl'
 
   def ExpandUser(self, path):
     return '$HOME/%s' % path
 
   def Exists(self, path):
     return self.files.get(path) is not None
 
   def MaybeMakeDirectory(self, path):
     pass
 
   def ReadFile(self, path):
     return self.files[path]
 
   def WriteFile(self, path, contents):
     self.files[path] = contents
 
-  def Call(self, cmd):
+  def Call(self, cmd, env=None):
+    if env:
+      self.cross_compile = env.get('GYP_CROSSCOMPILE')
     self.calls.append(cmd)
     if self.cmds:
       return self.cmds.pop(0)
     return 0, '', ''
 
   def Print(self, *args, **kwargs):
     sep = kwargs.get('sep', ' ')
     end = kwargs.get('end', '\n')
     f = kwargs.get('file', sys.stdout)
     if f == sys.stderr:
@@ skipping 21 matching lines @@
      self.files[self.name] = self.buf
 
 
 TEST_CONFIG = """\
 {
   'common_dev_configs': ['gn_debug'],
   'configs': {
     'gyp_rel_bot': ['gyp', 'rel', 'goma'],
     'gn_debug': ['gn', 'debug'],
     'gn_rel_bot': ['gn', 'rel', 'goma'],
-    'private': ['gyp', 'fake_feature1'],
+    'private': ['gyp', 'rel', 'fake_feature1'],
     'unsupported': ['gn', 'fake_feature2'],
   },
   'masters': {
     'fake_master': {
       'fake_builder': 'gyp_rel_bot',
       'fake_gn_builder': 'gn_rel_bot',
     },
   },
   'mixins': {
     'fake_feature1': {
       'gn_args': 'enable_doom_melon=true',
+      'gyp_crosscompile': True,
       'gyp_defines': 'doom_melon=1',
     },
     'fake_feature2': {
       'gn_args': 'enable_doom_melon=false',
       'gyp_defaults': 'doom_melon=0',
     },
     'gyp': {'type': 'gyp'},
     'gn': {'type': 'gn'},
     'goma': {
       'gn_args': 'use_goma=true goma_dir="$(goma_dir)"',
@@ skipping 35 matching lines @@
       self.assertEqual(mbw.err, err)
     return mbw
 
   def test_gn_analyze(self):
     files = {'/tmp/in.json': """{\
                "files": ["foo/foo_unittest.cc"],
                "targets": ["foo_unittests", "bar_unittests"]
              }"""}
 
     mbw = self.fake_mbw(files)
-    mbw.Call = lambda cmd: (0, 'out/Default/foo_unittests\n', '')
+    mbw.Call = lambda cmd, env=None: (0, 'out/Default/foo_unittests\n', '')
 
     self.check(['analyze', '-c', 'gn_debug', '//out/Default',
                 '/tmp/in.json', '/tmp/out.json'], mbw=mbw, ret=0)
     out = json.loads(mbw.files['/tmp/out.json'])
     self.assertEqual(out, {
       'status': 'Found dependency',
       'targets': ['foo_unittests'],
       'build_targets': ['foo_unittests']
     })
 
   def test_gn_analyze_all(self):
     files = {'/tmp/in.json': """{\
                "files": ["foo/foo_unittest.cc"],
                "targets": ["all", "bar_unittests"]
              }"""}
     mbw = self.fake_mbw(files)
-    mbw.Call = lambda cmd: (0, 'out/Default/foo_unittests\n', '')
+    mbw.Call = lambda cmd, env=None: (0, 'out/Default/foo_unittests\n', '')
     self.check(['analyze', '-c', 'gn_debug', '//out/Default',
                 '/tmp/in.json', '/tmp/out.json'], mbw=mbw, ret=0)
     out = json.loads(mbw.files['/tmp/out.json'])
     self.assertEqual(out, {
       'status': 'Found dependency (all)',
     })
 
   def test_gn_analyze_missing_file(self):
     files = {'/tmp/in.json': """{\
                "files": ["foo/foo_unittest.cc"],
@@ skipping 14 matching lines @@
       'targets': [],
       'status': 'No dependency',
     })
 
   def test_gn_gen(self):
     self.check(['gen', '-c', 'gn_debug', '//out/Default'], ret=0)
     self.check(['gen', '-c', 'gyp_rel_bot', '//out/Release'], ret=0)
 
   def test_gn_gen_fails(self):
     mbw = self.fake_mbw()
-    mbw.Call = lambda cmd: (1, '', '')
+    mbw.Call = lambda cmd, env=None: (1, '', '')
     self.check(['gen', '-c', 'gn_debug', '//out/Default'], mbw=mbw, ret=1)
 
   def test_gn_gen_swarming(self):
     files = {
       '/tmp/swarming_targets': 'base_unittests\n',
       '/fake_src/testing/buildbot/gn_isolate_map.pyl': (
           "{'base_unittests': {"
           "  'label': '//base:base_unittests',"
           "  'type': 'raw',"
           "  'args': [],"
@@ skipping 21 matching lines @@
                out=("/fake_src/buildtools/linux64/gn gen '<path>' "
                     "'--args=is_debug=false use_goma=true "
                     "goma_dir=\"/foo\"'\n" ))
 
   def test_gyp_analyze(self):
     mbw = self.check(['analyze', '-c', 'gyp_rel_bot', '//out/Release',
                      '/tmp/in.json', '/tmp/out.json'],
                      ret=0)
     self.assertIn('analyzer', mbw.calls[0])
 
+  def test_gyp_crosscompile(self):
+    mbw = self.fake_mbw()
+    self.check(['gen', '-c', 'private', '//out/Release'], mbw=mbw)
+    self.assertTrue(mbw.cross_compile)
+
   def test_gyp_gen(self):
     self.check(['gen', '-c', 'gyp_rel_bot', '//out/Release'], ret=0)
 
   def test_gyp_gen_fails(self):
     mbw = self.fake_mbw()
-    mbw.Call = lambda cmd: (1, '', '')
+    mbw.Call = lambda cmd, env=None: (1, '', '')
     self.check(['gen', '-c', 'gyp_rel_bot', '//out/Release'], mbw=mbw, ret=1)
 
   def test_gyp_lookup_goma_dir_expansion(self):
     self.check(['lookup', '-c', 'gyp_rel_bot', '-g', '/foo'], ret=0,
                out=("python build/gyp_chromium -G 'output_dir=<path>' "
                     "-G config=Release -D goma=1 -D gomadir=/foo\n"))
 
   def test_help(self):
     orig_stdout = sys.stdout
     try:
       sys.stdout = StringIO.StringIO()
       self.assertRaises(SystemExit, self.check, ['-h'])
       self.assertRaises(SystemExit, self.check, ['help'])
       self.assertRaises(SystemExit, self.check, ['help', 'gen'])
     finally:
       sys.stdout = orig_stdout
 
 
   def test_validate(self):
     self.check(['validate'], ret=0)
 
 
 if __name__ == '__main__':
   unittest.main()