Work in progres, please take a look and give early feedback if this is the way we want to structure…

src/vm/vm.gyp

 # Copyright (c) 2015, the Fletch project authors. Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE.md file.
 
 {
   'target_defaults': {
     'include_dirs': [
       '../../',
     ],
   },
   'targets': [
     {
       'target_name': 'fletch_vm_library_base',
       'type': 'static_library',
       'toolsets': ['target', 'host'],
       'dependencies': [
         '../shared/shared.gyp:fletch_shared',
         '../double_conversion.gyp:double_conversion',
       ],
       'sources': [
         # TODO(ahe): Add header (.h) files.
         'debug_info.cc',
         'event_handler.cc',
         'event_handler_macos.cc',
         'event_handler_linux.cc',
+        'ffi.h',
         'ffi.cc',
+        'ffi_linux.cc',
+        'ffi_macos.cc',
+        'ffi_posix.cc',
         'fletch.cc',
         'fletch_api_impl.cc',
         'heap.cc',
         'interpreter.cc',
         'intrinsics.cc',
         'lookup_cache.cc',
         'natives.cc',
         'object.cc',
         'object_list.cc',
         'object_map.cc',
@@ skipping 25 matching lines @@
       },
     },
     {
       'target_name': 'fletch_vm_library',
       'type': 'static_library',
       'dependencies': [
         'fletch_vm_library_generator#host',
         'fletch_vm_library_base',
         '../shared/shared.gyp:fletch_shared',
         '../double_conversion.gyp:double_conversion',
+        'ffi_test_library',
       ],
 
       # TODO(kasperl): Remove the below conditions when we no longer use weak
       # symbols.
       'conditions': [
         [ 'OS=="linux"', {
           'link_settings': {
             'ldflags': [
               '-Wl,--whole-archive',
             ],
@@ skipping 126 matching lines @@
       'sources': [
         # TODO(ahe): Add header (.h) files.
         'object_map_test.cc',
         'object_memory_test.cc',
         'object_test.cc',
         'platform_test.cc',
 
         '../shared/test_main.cc',
       ],
     },
+    {
+      'target_name': 'ffi_test_library',
+      'type': 'shared_library',
+      'dependencies': [
+      ],
+      # We need to unset a few cflags since they are not allowed when compiling
+      # a c library.
+      'cflags!': [
+        '-std=c++11',
+        '-fno-rtti',
+        '-Wno-non-virtual-dtor',
+      ],
+      'sources': [
+        'ffi_test_library.c',
+      ],
+      'defines': [
+        'PIC',
+      ],
+    },
   ],
 }