When cross-compiling, also build and link run_vm_tests for the host architecture.

runtime/bin/bin.gypi

 # Copyright (c) 2012, the Dart 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 file.
 
 {
   'variables': {
     # We place most generated source files in LIB_DIR (rather than, say
     # SHARED_INTERMEDIATE_DIR) because it is toolset specific. This avoids
     # two problems. First, if a generated source file has architecture specific
     # code, we'll get two different files in two different directories. Second,
@@ skipping 162 matching lines @@
             'libraries': [
               '-ldl',
             ],
           },
         }],
       ],
     },
     {
       'target_name': 'libdart_io',
       'type': 'static_library',
+      'toolsets':['host', 'target'],
       'include_dirs': [
         '..',
       ],
       'sources': [
         'io_natives.h',
         'io_natives.cc',
       ],
       'includes': [
         'io_impl_sources.gypi',
       ],
@@ skipping 279 matching lines @@
     {
       'target_name': 'process_test',
       'type': 'executable',
       'sources': [
         'process_test.cc',
       ]
     },
     {
       'target_name': 'run_vm_tests',
       'type': 'executable',
+      'toolsets':['target'],
       'dependencies': [
         'libdart_withcore',
         'libdart_builtin',
         'libdart_io',
         'generate_snapshot_file#host',
         'generate_snapshot_test_dat_file',
       ],
       'include_dirs': [
         '..',
         '<(gen_source_dir)',
@@ skipping 29 matching lines @@
       ],
       'conditions': [
         ['OS=="win"', {
           'link_settings': {
             'libraries': [ '-lws2_32.lib', '-lRpcrt4.lib', '-lwinmm.lib' ],
           },
         }],
       ],
     },
     {
+      'target_name': 'run_vm_tests.host',
+      'type': 'executable',
+      'toolsets':['host'],
+      'dependencies': [
+        'libdart_withcore',
+        'libdart_builtin',
+        'libdart_io',
+        'generate_snapshot_file#host',
+        'generate_snapshot_test_dat_file',
+      ],
+      'include_dirs': [
+        '..',
+        '<(gen_source_dir)',
+      ],
+      'sources': [
+        'run_vm_tests.cc',
+        'builtin_natives.cc',
+        'builtin_nolib.cc',
+        'builtin.h',
+        'io_natives.h',
+        # Include generated source files.
+        '<(snapshot_cc_file)',
+        '<(builtin_cc_file)',
+        '<(io_cc_file)',
+        '<(io_patch_cc_file)',
+      ],
+      'includes': [
+        'builtin_impl_sources.gypi',
+        '../platform/platform_sources.gypi',
+        '../vm/vm_sources.gypi',
+      ],
+      'defines': [
+        'TESTING',
+      ],
+      # Only include _test.[cc|h] files.
+      'sources/': [
+        ['exclude', '\\.(cc|h)$'],
+        ['include', 'run_vm_tests.cc'],
+        ['include', 'builtin_nolib.cc'],
+        ['include', 'builtin_natives.cc'],
+        ['include', '_gen\\.cc$'],
+        ['include', '_test\\.(cc|h)$'],
+      ],
+      'conditions': [
+        ['OS=="win"', {
+          'link_settings': {
+            'libraries': [ '-lws2_32.lib', '-lRpcrt4.lib', '-lwinmm.lib' ],
+          },
+        }],
+      ],
+    },
+    {
       'target_name': 'test_extension',
       'type': 'shared_library',
       'dependencies': [
         'dart',
       ],
       'include_dirs': [
         '..',
       ],
       'sources': [
         'test_extension.cc',
@@ skipping 20 matching lines @@
         ['OS=="linux"', {
           'cflags': [
             '-fPIC',
           ],
         }],
       ],
     },
   ],
 }