Check for v8

src/mbgl/style/style_parser.cpp

@@ -27,6 +27,13 @@ StyleParser::StyleParser(MapData& data_)
 }
 
 void StyleParser::parse(JSVal document) {
+    if (document.HasMember("version")) {
+        version = document["version"].GetInt();
+        if (version != 8) {
+            Log::Warning(Event::ParseStyle, "current renderer implementation only supports style spec version 8; using an outdated style will cause rendering errors");
+        }
+    }
+
     if (document.HasMember("constants")) {
         parseConstants(document["constants"]);
     }

src/mbgl/style/style_parser.hpp

@@ -103,6 +103,8 @@ private:
 private:
     std::unordered_map<std::string, const rapidjson::Value *> constants;
 
+    std::uint8_t version;
+
     std::vector<std::unique_ptr<Source>> sources;
     std::vector<util::ptr<StyleLayer>> layers;