Compile expat for PNaCl

Added expat_nacl target that compiles expat for PNaCl

BUG=276739

Review URL: https://codereview.chromium.org/120303002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@243765 0039d316-1c4b-4281-b951-d872f2087c98

third_party/expat/expat_nacl.gyp

+# Copyright 2014 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+{
+  'includes': [
+    '../../native_client/build/untrusted.gypi',
+  ],
+  'targets': [
+    {
+      'target_name': 'expat_nacl',
+      'type': 'none',
+      'variables': {
+        'nlib_target': 'libexpat_nacl.a',
+        'build_glibc': 0,
+        'build_newlib': 0,
+        'build_pnacl_newlib': 1,
+      },
+      'sources': [
+        'files/lib/expat.h',
+        'files/lib/xmlparse.c',
+        'files/lib/xmlrole.c',
+        'files/lib/xmltok.c',
+      ],
+      'include_dirs': [
+        'files/lib',
+      ],
+      'defines': [
+        '_LIB',
+        'XML_STATIC',
+        'HAVE_MEMMOVE',
+      ],
+      'compile_flags': [
+        '-Wno-enum-conversion',
+        '-Wno-switch',
+      ],
+      'direct_dependent_settings': {
+        'include_dirs': [
+          'files/lib'
+        ],
+        'defines': [
+          'XML_STATIC',  # Tell dependants to expect static linkage.
+        ],
+      },
+    },
+  ],
+}