Support for custom NM/readelf binaries in your toolchain.

test/compiler-override/compiler-shared-lib.gyp

 # Copyright (c) 2012 Google Inc. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
   'targets': [
     {
-      'target_name': 'hello',
-      'type': 'executable',
+      'target_name': 'hello-lib',
+      'type': 'shared_library',
       'sources': [
         'test.c',
         'cxxtest.cc',
       ],
     },
   ],
 }