code: def msvc_output_flag(target, source, env, for_signature):
      
  
      # Fixing MSVC_BATCH mode. Previous if did not work when MSVC_BATCH
      # was set to False. This new version should work better. Removed
      # len(source)==1 as batch mode can compile only one file
      # (and it also fixed problem with compiling only one changed file
      # with batch mode enabled)
      if not 'MSVC_BATCH' in env or env.subst('$MSVC_BATCH') in ('0', 'False', '', None):
          return '/Fo$TARGET'
      else:
          # The Visual C/C++ compiler requires a \ at the end of the /Fo
          # option to indicate an output directory.  We use os.sep here so
          # that the test(s) for this can be run on non-Windows systems
          # without having a hard-coded backslash mess up command-line
          # argument parsing.
          return '/Fo${TARGET.dir}' + os.sep
docs: Returns the correct /Fo flag for batching.
  
      If batching is disabled or there's only one source file, then we
      return an /Fo string that specifies the target explicitly.  Otherwise,
      we return an /Fo string that just specifies the first target's
      directory (where the Visual C/C++ compiler will put the .obj files).