1 files changed, 9 insertions, 0 deletions
diff --git a/src/google/protobuf/compiler/importer.h b/src/google/protobuf/compiler/importer.h
index f010fd08..cc8fcc39 100644
--- a/src/google/protobuf/compiler/importer.h
+++ b/src/google/protobuf/compiler/importer.h
@@ -121,6 +121,12 @@ class LIBPROTOBUF_EXPORT SourceTreeDescriptorDatabase : public DescriptorDatabas
                   ErrorLocation location,
                   const string& message);
 
+    virtual void AddWarning(const string& filename,
+                            const string& element_name,
+                            const Message* descriptor,
+                            ErrorLocation location,
+                            const string& message);
+
    private:
     SourceTreeDescriptorDatabase* owner_;
   };
@@ -188,6 +194,9 @@ class LIBPROTOBUF_EXPORT MultiFileErrorCollector {
   virtual void AddError(const string& filename, int line, int column,
                         const string& message) = 0;
 
+  virtual void AddWarning(const string& filename, int line, int column,
+                          const string& message) {}
+
  private:
   GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(MultiFileErrorCollector);
 };