This change allows compilation with...

src/trusted/service_runtime/arch/x86_64/service_runtime_x86_64.gyp

 # Copyright 2009, Google Inc.
 # All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
@@ skipping 22 matching lines @@
   ],
   'targets': [
     {
       'target_name': 'service_runtime_x86_64',
       'type': 'static_library',
       'sources': [
         'nacl_switch.S',
         'nacl_syscall.S',
         'sel_rt_64.c',
       ],
+      'conditions': [
+        [ 'library=="shared_library"', {
+            'asflags': [
+              '-fPIC',
+            ],
+        }],
+      ],
     },
   ],
 }