build: windows sharedlib support

Original Commit Message:
  Added "dll" option to vcbuild.bat
  Insure that Unix SO name is not used on Windows (i.e. produce a .dll file)
  Insure that Node and its V8 dependency link against the Visual C++ Runtime
  dynamically.
  Requires backported V8 patch, see PR 7802.

  Ref: https://github.com/nodejs/node/pull/7802

  PR-URL: https://github.com/nodejs/node/pull/7487
  Reviewed-By: Alexis Campailla <alexis@janeasystems.com>
  Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>

PR-URL: https://github.com/nodejs/node/pull/8084
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: James M Snell <jasnell@gmail.com>

common.gypi

@@ -12,6 +12,7 @@
     'python%': 'python',
 
     'node_shared%': 'false',
+    'force_dynamic_crt%': 0,
     'node_use_v8_platform%': 'true',
     'node_use_bundled_v8%': 'true',
     'node_module_version%': '',
@@ -78,11 +79,24 @@
           ['OS == "android"', {
             'cflags': [ '-fPIE' ],
             'ldflags': [ '-fPIE', '-pie' ]
+          }],
+          ['node_shared=="true"', {
+            'msvs_settings': {
+             'VCCLCompilerTool': {
+               'RuntimeLibrary': 3, # MultiThreadedDebugDLL (/MDd)
+             }
+            }
+          }],
+          ['node_shared=="false"', {
+            'msvs_settings': {
+              'VCCLCompilerTool': {
+                'RuntimeLibrary': 1 # MultiThreadedDebug (/MTd)
+              }
+            }
           }]
         ],
         'msvs_settings': {
           'VCCLCompilerTool': {
-            'RuntimeLibrary': 1, # static debug
             'Optimization': 0, # /Od, no optimization
             'MinimalRebuild': 'false',
             'OmitFramePointers': 'false',
@@ -115,11 +129,24 @@
           ['OS == "android"', {
             'cflags': [ '-fPIE' ],
             'ldflags': [ '-fPIE', '-pie' ]
+          }],
+          ['node_shared=="true"', {
+            'msvs_settings': {
+             'VCCLCompilerTool': {
+               'RuntimeLibrary': 2 # MultiThreadedDLL (/MD)
+             }
+            }
+          }],
+          ['node_shared=="false"', {
+            'msvs_settings': {
+              'VCCLCompilerTool': {
+                'RuntimeLibrary': 0 # MultiThreaded (/MT)
+              }
+            }
           }]
         ],
         'msvs_settings': {
           'VCCLCompilerTool': {
-            'RuntimeLibrary': 0, # static release
             'Optimization': 3, # /Ox, full optimization
             'FavorSizeOrSpeed': 1, # /Ot, favour speed over size
             'InlineFunctionExpansion': 2, # /Ob2, inline anything eligible

configure

@@ -893,6 +893,7 @@ def configure_v8(o):
   o['variables']['v8_use_snapshot'] = 'false' if options.without_snapshot else 'true'
   o['variables']['node_use_v8_platform'] = b(not options.without_v8_platform)
   o['variables']['node_use_bundled_v8'] = b(not options.without_bundled_v8)
+  o['variables']['force_dynamic_crt'] = 1 if options.shared else 0
   o['variables']['node_enable_d8'] = b(options.enable_d8)
   if options.enable_d8:
     o['variables']['test_isolation_mode'] = 'noop'  # Needed by d8.gyp.

node.gyp

@@ -9,6 +9,7 @@
     'node_use_v8_platform%': 'true',
     'node_use_bundled_v8%': 'true',
     'node_shared%': 'false',
+    'force_dynamic_crt%': 0,
     'node_module_version%': '',
     'node_shared_zlib%': 'false',
     'node_shared_http_parser%': 'false',
@@ -247,7 +248,7 @@
             'NODE_SHARED_MODE',
           ],
           'conditions': [
-            [ 'node_module_version!=""', {
+            [ 'node_module_version!="" and OS!="win"', {
               'product_extension': '<(shlib_suffix)',
             }]
           ],

vcbuild.bat

@@ -38,6 +38,7 @@ set build_release=
 set enable_vtune_arg=
 set configure_flags=
 set build_addons=
+set dll=
 
 :next-arg
 if "%1"=="" goto args-done
@@ -79,6 +80,7 @@ if /i "%1"=="without-intl"     set i18n_arg=%1&goto arg-ok
 if /i "%1"=="download-all"  set download_arg="--download=all"&goto arg-ok
 if /i "%1"=="ignore-flaky"  set test_args=%test_args% --flaky-tests=dontcare&goto arg-ok
 if /i "%1"=="enable-vtune"  set enable_vtune_arg=1&goto arg-ok
+if /i "%1"=="dll"           set dll=1&goto arg-ok
 
 echo Warning: ignoring invalid command line option `%1`.
 
@@ -108,6 +110,7 @@ if defined noperfctr set configure_flags=%configure_flags% --without-perfctr& se
 if defined release_urlbase set release_urlbase_arg=--release-urlbase=%release_urlbase%
 if defined download_arg set configure_flags=%configure_flags% %download_arg%
 if defined enable_vtune_arg set configure_flags=%configure_flags% --enable-vtune-profiling
+if defined dll set configure_flags=%configure_flags% --shared
 
 if "%i18n_arg%"=="full-icu" set configure_flags=%configure_flags% --with-intl=full-icu
 if "%i18n_arg%"=="small-icu" set configure_flags=%configure_flags% --with-intl=small-icu