Extract common macros and start a base library

tools/gyp/v8.gyp

Index: tools/gyp/v8.gyp
diff --git a/tools/gyp/v8.gyp b/tools/gyp/v8.gyp
index 8dba67fd6d2686de460596484bf055052836d49c..5785336a21c33cf04f787f7276f377b5e1bc3bee 100644
--- a/tools/gyp/v8.gyp
+++ b/tools/gyp/v8.gyp
@@ -237,6 +237,9 @@
     {
       'target_name': 'v8_base.<(v8_target_arch)',
       'type': 'static_library',
+      'dependencies': [
+        'v8_libbase.<(v8_target_arch)',
+      ],
       'variables': {
         'optimize': 'max',
       },
@@ -1031,6 +1034,33 @@
       ],
     },
     {
+      'target_name': 'v8_libbase.<(v8_target_arch)',
+      # TODO(jochen): Should be a static library once it has sources in it.
+      'type': 'none',
+      'variables': {
+        'optimize': 'max',
+      },
+      'include_dirs+': [
+        '../../src',
+      ],
+      'sources': [
+        '../../src/base/macros.h',
+      ],
+      'conditions': [
+        ['want_separate_host_toolset==1', {
+          'toolsets': ['host', 'target'],
+        }, {
+          'toolsets': ['target'],
+        }],
+        ['component=="shared_library"', {
+          'defines': [
+            'BUILDING_V8_SHARED',
+            'V8_SHARED',
+          ],
+        }],
+      ],
+    },
+    {
       'target_name': 'js2c',
       'type': 'none',
       'conditions': [