fix pylint warning: build/toolchain/mac/linker_driver.py

build/toolchain/mac/linker_driver.py

 #!/usr/bin/env python
 
 # Copyright 2016 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.
 
 import os
 import os.path
 import shutil
 import subprocess
@@ skipping 112 matching lines @@
         located.
     full_args: list of string, Full argument list for the linker driver.
 
   Returns:
       list of string, Build step outputs.
   """
   if not len(dsym_path_prefix):
     raise ValueError('Unspecified dSYM output file')
 
   linker_out = _FindLinkerOutput(full_args)
-  (head, tail) = os.path.split(linker_out)
-  dsym_out = os.path.join(dsym_path_prefix, tail + '.dSYM')
+  base = os.path.basename(linker_out)
+  dsym_out = os.path.join(dsym_path_prefix, base + '.dSYM')
 
   # Remove old dSYMs before invoking dsymutil.
   _RemovePath(dsym_out)
   subprocess.check_call(['xcrun', 'dsymutil', '-o', dsym_out, linker_out])
   return [dsym_out]
 
 
 def RunSaveUnstripped(unstripped_path_prefix, full_args):
   """Linker driver action for -Wcrl,unstripped,<unstripped_path_prefix>. Copies
   the linker output to |unstripped_path_prefix| before stripping.
 
   Args:
     unstripped_path_prefix: string, The path at which the unstripped output
         should be located.
     full_args: list of string, Full argument list for the linker driver.
 
   Returns:
     list of string, Build step outputs.
   """
   if not len(unstripped_path_prefix):
     raise ValueError('Unspecified unstripped output file')
 
   linker_out = _FindLinkerOutput(full_args)
-  (head, tail) = os.path.split(linker_out)
-  unstripped_out = os.path.join(unstripped_path_prefix, tail + '.unstripped')
+  base = os.path.basename(linker_out)
+  unstripped_out = os.path.join(unstripped_path_prefix, base + '.unstripped')
 
   shutil.copyfile(linker_out, unstripped_out)
   return [unstripped_out]
 
 
 def RunStrip(strip_args_string, full_args):
   """Linker driver action for -Wcrl,strip,<strip_arguments>.
 
   Args:
       strip_args_string: string, Comma-separated arguments for `strip`.
@@ skipping 44 matching lines @@
 _LINKER_DRIVER_ACTIONS = [
     ('dsym,', RunDsymUtil),
     ('unstripped,', RunSaveUnstripped),
     ('strip,', RunStrip),
 ]
 
 
 if __name__ == '__main__':
   Main(sys.argv)
   sys.exit(0)