Add a build target for opus_compare.

third_party/opus/opus.gyp

 # Copyright (c) 2012 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.
 
 {
   'variables': {
     'conditions': [
       ['target_arch=="arm" or target_arch=="arm64"', {
         'use_opus_fixed_point%': 1,
       }, {
@@ skipping 111 matching lines @@
                     'opus_srcs_rtcd.gypi',
                   ],
                 }],
               ],
             }],
           ],
         }],
       ],
     },  # target opus
     {
+      'target_name': 'opus_compare',
+      'type': 'executable',
+      'dependencies': [
+        'opus'
+      ],
+      'conditions': [
+        ['OS == "win"', {
+          'defines': [
+            'inline=__inline',
+          ],
+        }],
+        ['OS=="android"', {
+          'link_settings': {
+            'libraries': [
+              '-llog',
+            ],
+          },
+        }],
+        ['clang==1', {
+          'cflags': [ '-Wno-absolute-value' ],
+        }]
+      ],
+      'sources': [
+        'src/src/opus_compare.c',
+      ],
+      'include_dirs': [
+        'src/celt',
+        'src/silk',
+      ],
+    },  # target opus_compare
+    {
       'target_name': 'opus_demo',
       'type': 'executable',
       'dependencies': [
         'opus'
       ],
       'conditions': [
         ['OS == "win"', {
           'defines': [
             'inline=__inline',
           ],
@@ skipping 12 matching lines @@
       'sources': [
         'src/src/opus_demo.c',
       ],
       'include_dirs': [
         'src/celt',
         'src/silk',
       ],
     },  # target opus_demo
   ]
 }