Use AnalysisOptions.signature as a way to check compatibility.

pkg/analysis_server/lib/src/status/get_handler.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library analysis_server.src.status.get_handler;
 
 import 'dart:collection';
 import 'dart:convert';
 import 'dart:io';
 import 'dart:math';
@@ skipping 403 matching lines @@
       _returnUnknownRequest(request);
     }
   }
 
   /**
    * Produce an encoded version of the given [descriptor] that can be used to
    * find the descriptor later.
    */
   String _encodeSdkDescriptor(SdkDescription descriptor) {
     StringBuffer buffer = new StringBuffer();
-    buffer.write(descriptor.options.encodeCrossContextOptions().join(','));
+    buffer.write(descriptor.options.signature.join(','));
     for (String path in descriptor.paths) {
       buffer.write('+');
       buffer.write(path);
     }
     return buffer.toString();
   }
 
   /**
    * Return the folder being managed by the given [analysisServer] that matches
    * the given [contextFilter], or `null` if there is none.
@@ skipping 2309 matching lines @@
    */
   static String makeLink(
       String path, Map<String, String> params, String innerHtml,
       [bool hasError = false]) {
     Uri uri = new Uri(path: path, queryParameters: params);
     String href = HTML_ESCAPE.convert(uri.toString());
     String classAttribute = hasError ? ' class="error"' : '';
     return '<a href="$href"$classAttribute>$innerHtml</a>';
   }
 }