Add support for "else if" in gyp conditions

test/conditions/elseif/gyptest_elseif.py

+#!/usr/bin/env python
+
+# Copyright (c) 2014 Google Inc. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+"""
+Verify that "else-if" conditons work.

[scottmg, 2014/11/14 17:09:44]

conditons -> conditions

+"""
+
+import TestGyp
+
+test = TestGyp.TestGyp(formats=['msvs', 'ninja'])

[scottmg, 2014/11/14 17:09:44]

should be all generators

+
+test.run_gyp('elseif.gyp')
+test.build('elseif.gyp', test.ALL)
+test.run_built_executable(
+    'program', stdout='first_if\n')
+
+test.run_gyp('elseif.gyp', '-Dtest_var=1')
+test.build('elseif.gyp', test.ALL)
+test.run_built_executable(
+    'program', stdout='first_else_if\n')
+
+test.run_gyp('elseif.gyp', '-Dtest_var=2')
+test.build('elseif.gyp', test.ALL)
+test.run_built_executable(
+    'program', stdout='second_else_if\n')
+
+test.run_gyp('elseif.gyp', '-Dtest_var=3')
+test.build('elseif.gyp', test.ALL)
+test.run_built_executable(
+    'program', stdout='third_else_if\n')
+
+test.run_gyp('elseif.gyp', '-Dtest_var=4')
+test.build('elseif.gyp', test.ALL)
+test.run_built_executable(
+    'program', stdout='last_else\n')
+
+test.pass_test()