Fix compile_test.py for CXX values that contain spaces.

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.
 """
@@ skipping 12 matching lines @@
   parser.add_option('--code')
   parser.add_option('--run-linker', action='store_true')
   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++')
+  # The environment variable might expand to a string with spaces,
+  # e.g. "ccache g++". Convert it to a list suitable for argv.
+  cxx = os.environ.get('CXX', 'g++').split()
 
   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_cmdline = [cxx, cxx_path, '-o', o_path]
+    cxx_cmdline = cxx + [cxx_path, '-o', o_path]
     if not options.run_linker:
       cxx_cmdline.append('-c')
     # Pass remaining arguments to the compiler.
     cxx_cmdline += args
     cxx_popen = subprocess.Popen(cxx_cmdline,
                                  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:]))