Linux: add a tool and code to make use_system_ffmpeg option more compatible

tools/compile_test/compile_test.py

+#!/usr/bin/env python
+# Copyright (c) 2013 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.
+
+"""
+Tries to compile given code, produces different output depending on success.
+
+This is similar to checks done by ./configure scripts.
+"""
+
+
+import optparse
+import os
+import shutil
+import subprocess
+import sys
+import tempfile
+
+
+def DoMain(argv):
+  parser = optparse.OptionParser()
+  parser.add_option('--code')
+  parser.add_option('--on-success', default='')
+  parser.add_option('--on-failure', default='')
+
+  options, args = parser.parse_args(argv)
+
+  if not options.code:
+    parser.error('Missing required --code switch.')
+
+  cxx = os.environ.get('CXX', 'g++')
+
+  tmpdir = tempfile.mkdtemp()
+  try:
+    cxx_path = os.path.join(tmpdir, 'test.cc')
+    with open(cxx_path, 'w') as f:
+      f.write(options.code.decode('string-escape'))
+
+    o_path = os.path.join(tmpdir, 'test.o')
+
+    cxx_popen = subprocess.Popen([cxx, cxx_path, '-o', o_path, '-c'],
+                                 stdout=subprocess.PIPE,
+                                 stderr=subprocess.PIPE)
+    cxx_stdout, cxx_stderr = cxx_popen.communicate()
+    if cxx_popen.returncode == 0:
+      print options.on_success
+    else:
+      print options.on_failure
+  finally:
+    shutil.rmtree(tmpdir)
+
+  return 0
+
+
+if __name__ == '__main__':
+  sys.exit(DoMain(sys.argv[1:]))