improve xcode_emulation.py

test/mac/gyptest-clang-cxx-library.py

Index: test/mac/gyptest-clang-cxx-library.py
diff --git a/test/mac/gyptest-clang-cxx-library.py b/test/mac/gyptest-clang-cxx-library.py
new file mode 100644
index 0000000000000000000000000000000000000000..728cd1c898bf765a598a7aa5a724de8a2ec0d02d
--- /dev/null
+++ b/test/mac/gyptest-clang-cxx-library.py
@@ -0,0 +1,23 @@
+#!/usr/bin/env python
+
+# Copyright (c) 2013 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 that CLANG_CXX_LIBRARY works.
+"""
+
+import TestGyp
+
+import sys
+
+if sys.platform == 'darwin':
+  test = TestGyp.TestGyp(formats=['make', 'ninja', 'xcode'])
+
+  test.run_gyp('clang-cxx-library.gyp', chdir='clang-cxx-library')

[Nico, 2013/03/18 15:32:31]

This test needs something like

  if not os.path.isdir('/usr/lib/c++'):
    return

It looks like Xcode 4.2 on 10.6 doesn't install libc++, at least not in the
place clang expects it (and where it is with later versions):

$ clang -v
# …
ignoring nonexistent directory "/usr/include/c++/v1"
ignoring nonexistent directory "/usr/local/include"
#include "..." search starts here:
#include <...> search starts here:
 /usr/bin/../lib/clang/3.0/include
 /usr/include
 /System/Library/Frameworks (framework directory)
 /Library/Frameworks (framework directory)


I can't think of a better fix than skipping this test if it doesn't exist (which
means the test won't run on our bots at the moment, but oh well).

+
+  test.build('clang-cxx-library.gyp', test.ALL, chdir='clang-cxx-library')
+
+  test.pass_test()
+