ninja/mac: Don't link c-file-only targets to libstdc++

test/no-cpp/gyptest-no-cpp.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.
+
+"""
+Checks that C-only targets aren't linked against libstdc++.
+"""
+
+import TestGyp
+
+import re
+import subprocess
+import sys
+
+# set |match| to ignore build stderr output.
+test = TestGyp.TestGyp(match = lambda a, b: True)
+if sys.platform != 'win32' and test.format not in ('make', 'android'):
+  # TODO: This doesn't pass with make.
+  # TODO: Does a test like this make sense with Windows? Android?

[Nico, 2013/09/10 21:11:45]

Does msvs automatically link a c++ runtime if there are cc files in a target? or
is that always an explicit setting?

[scottmg, 2013/09/10 21:31:33]

I'm actually not sure how it decides to depend on msvcp. There's no command line
setting, but just having a .cc file isn't enough. (Or, it might be, but the
linker drops it unless c++ symbols are actually referenced).

+
+  CHDIR = 'src'
+  test.run_gyp('test.gyp', chdir=CHDIR)
+  test.build('test.gyp', 'no_cpp', chdir=CHDIR)
+
+  def LinksLibStdCpp(p):

[scottmg, 2013/09/10 21:09:15]

nit; p -> path

[Nico, 2013/09/10 21:11:45]

Done.

+    p = test.built_file_path(p, chdir=CHDIR)
+    if sys.platform == 'darwin':
+      proc = subprocess.Popen(['otool', '-L', p], stdout=subprocess.PIPE)
+    else:
+      proc = subprocess.Popen(['ldd', p], stdout=subprocess.PIPE)
+    o = proc.communicate()[0]

[scottmg, 2013/09/10 21:09:15]

nit; o -> out or output

[Nico, 2013/09/10 21:11:45]

Done.

+    assert not proc.returncode
+    return 'libstdc++' in o or 'libc++' in o
+
+  if LinksLibStdCpp('no_cpp'):
+    test.fail_test()
+
+  build_error_code = {
+    'xcode': [1, 65],  # 1 for xcode 3, 65 for xcode 4 (see `man sysexits`)
+    'make': 2,
+    'ninja': 1,
+  }[test.format]
+
+  test.build('test.gyp', 'no_cpp_dep_on_cc_lib', chdir=CHDIR,
+             status=build_error_code)
+
+  test.pass_test()