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

third_party/libxml/libxml.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.
 
 {
   'variables': {
     'conditions': [
       ['OS=="linux"', {'os_include': 'linux'}],
       ['OS=="mac"', {'os_include': 'mac'}],
       ['OS=="win"', {'os_include': 'win32'}],
@@ skipping 13 matching lines @@
             'cflags': [
               '<!@(python ../../build/linux/pkg_config_wrapper.py --cflags libxml-2.0)',
             ],
           },
           'link_settings': {
             'libraries': [
               '<!@(python ../../build/linux/pkg_config_wrapper.py --libs libxml-2.0)',
             ],
           },
         }, { # else: OS != "linux" or ! use_system_libxml
-          'type': 'static_library',
+          'type': '<(library)',
           'msvs_guid': 'F9810DE8-CBC3-4605-A7B1-ECA2D5292FD7',
           'sources': [
             'include/libxml/c14n.h',
             'include/libxml/catalog.h',
             'include/libxml/chvalid.h',
             'include/libxml/debugXML.h',
             'include/libxml/dict.h',
             'include/libxml/DOCBparser.h',
             'include/libxml/encoding.h',
             'include/libxml/entities.h',
@@ skipping 172 matching lines @@
           'link_settings': {
             'libraries': [
               '-lm',
             ],
           },
         }],
       ],
     },
   ],
 }