Subzero: Clean up the runtime implementation.

pydir/build-runtime.py

 #!/usr/bin/env python2
 
 import argparse
 import os
 import shutil
 import tempfile
 from utils import shellcmd
 from utils import FindBaseNaCl
 
 def Translate(ll_files, extra_args, obj, verbose):
     """Translate a set of input bitcode files into a single object file.
 
     Use pnacl-llc to translate textual bitcode input ll_files into object file
     obj, using extra_args as the architectural flags.
     """
     shellcmd(['cat'] + ll_files + ['|',
               'pnacl-llc',
               '-externalize',
+              '-function-sections',
+              '-O2',
               '-filetype=obj',
               '-bitcode-format=llvm',
               '-o', obj
           ] + extra_args, echo=verbose)
     shellcmd(['objcopy',
               '--localize-symbol=nacl_tp_tdb_offset',
               '--localize-symbol=nacl_tp_tls_offset',
               obj
         ], echo=verbose)
 
@@ skipping 53 matching lines @@
                   args.verbose)
     finally:
         try:
             shutil.rmtree(tempdir)
         except OSError as exc:
             if exc.errno != errno.ENOENT: # ENOENT - no such file or directory
                 raise # re-raise exception
 
 if __name__ == '__main__':
     main()