Basic underpinnings of the gyp equivalent of the Linux SHARED=1 build:...

sandbox/sandbox.gyp

 # Copyright (c) 2009 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
   'includes': [
     '../build/common.gypi',
   ],
   'conditions': [
     [ 'OS=="win"', {
       'targets': [
         {
           'target_name': 'sandbox',
-          'type': 'static_library',
+          'type': '<(library)',
           'dependencies': [
             '../testing/gtest.gyp:gtest',
             '../base/base.gyp:base',
           ],
           'msvs_guid': '881F6A97-D539-4C48-B401-DF04385B2343',
           'sources': [
             'src/acl.cc',
             'src/acl.h',
             'src/dep.cc',
             'src/dep.h',
@@ skipping 292 matching lines @@
             'Debug': {
               'msvs_precompiled_header': 'sandbox_poc/pocdll/stdafx.h',
               'msvs_precompiled_source': 'sandbox_poc/pocdll/stdafx.cc',
             },
           },
         },
       ],
     }],
   ],
 }