Implemented linking to a dummy ASan runtime

pydir/build-runtime.py

 #!/usr/bin/env python2
 
 import argparse
 import os
 import shutil
 import tempfile
 
 import targets
 from utils import FindBaseNaCl, GetObjcopyCmd, shellcmd
 
@@ skipping 66 matching lines @@
     # Write full szrt_native_{target}.o.
     PartialLink([TmpFile('{dir}/szrt_native_{target}.tmp.o'),
                  TmpFile('{dir}/szrt_native_asm_{target}.o'),
                  TmpFile('{dir}/szrt_native_profiler_{target}.o')],
                 ['-m {ld_emu}'.format(ld_emu=target_info.ld_emu)],
                 OutFile('{rtdir}/szrt_native_{target}.o'),
                 verbose)
     shellcmd([GetObjcopyCmd(),
               '--strip-symbol=NATIVE',
               OutFile('{rtdir}/szrt_native_{target}.o')])
+    # Compile srcdir/szrt_asan.c to
+    # tempdir/szrt_native_asan_{target}.o
+    shellcmd(['clang',
+              '-O2',
+              '-target=' + target_info.triple,
+              '-c',
+              '{srcdir}/szrt_asan.c'.format(srcdir=srcdir),
+              '-o', OutFile('{rtdir}/szrt_asan_{target}.o')
+      ], echo=verbose)
 
   # Helper function for building the sandboxed runtime.
   def MakeSandboxedRuntime():
     """Builds just the sandboxed runtime."""
     # Translate tempdir/szrt.ll and tempdir/szrt_ll.ll to szrt_sb_{target}.o.
     # The sandboxed library does not get the profiler helper function as the
     # binaries are linked with -nostdlib.
     Translate(ll_files,
               ['-mtriple=' + targets.ConvertTripleToNaCl(target_info.triple)] +
               target_info.llc_flags,
@@ skipping 109 matching lines @@
 
     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()