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

third_party/libjpeg/libjpeg.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',
   ],
   'targets': [
     {
       'target_name': 'libjpeg',
-      'type': 'static_library',
+      'type': '<(library)',
       'msvs_guid': '238CE175-76CE-4A25-A676-69D115885601',
       'sources': [
         'jcapimin.c',
         'jcapistd.c',
         'jccoefct.c',
         'jccolor.c',
         'jcdctmgr.c',
         'jchuff.c',
         'jchuff.h',
         'jcinit.c',
@@ skipping 48 matching lines @@
         'include_dirs': [
           '.',
         ],
       },
       'conditions': [
         ['OS!="win"', {'product_name': 'jpeg'}],
       ],
     },
   ],
 }