Support for custom NM/readelf binaries in your toolchain.

test/make_global_settings/full-toolchain/make_global_settings.gyp

+# Copyright (c) 2013 Google Inc. All rights reserved.
+# Use of this source code is governed by a BSD-style licence that can be
+# found in the LICENSE file.
+
+{
+  'make_global_settings': [
+    ['CC', '/bin/echo MY_CC'],
+    ['CXX', '/bin/echo MY_CXX'],
+    ['NM', '<(python) <(workdir)/my_nm.py'],
+    ['READELF', '<(python) <(workdir)/my_readelf.py'],
+  ],
+  'targets': [
+    {
+      'target_name': 'test',
+      'type': 'shared_library',
+      'sources': [
+        'foo.c',
+        'bar.cc',
+      ],
+    },
+  ],
+}