1 files changed, 9 insertions, 3 deletions
diff --git a/lib/rdoc/options.rb b/lib/rdoc/options.rb
index f67241bc03..45b69186f9 100644
--- a/lib/rdoc/options.rb
+++ b/lib/rdoc/options.rb
@@ -350,13 +350,14 @@ Usage: #{opt.program_name} [options] [names...]
     end
 
     argv.insert(0, *ENV['RDOCOPT'].split) if ENV['RDOCOPT']
+    ignored = []
 
     begin
       opts.parse! argv
     rescue OptionParser::InvalidArgument, OptionParser::InvalidOption => e
-      if ignore_invalid and not quiet then
-        $stderr.puts e
-        $stderr.puts '(invalid options are ignored)'
+      if ignore_invalid then
+        ignored << e.args.join(' ')
+        retry
       else
         $stderr.puts opts
         $stderr.puts
@@ -365,6 +366,11 @@ Usage: #{opt.program_name} [options] [names...]
       end
     end
 
+    if ignored and not quiet then
+      $stderr.puts "invalid options: #{ignored.join ', '}"
+      $stderr.puts '(invalid options are ignored)'
+    end
+
     @op_dir ||= 'doc'
     @files = argv.dup