Running `gem pristine --all` ... will improve the startup performance of Spring. (doesn't actually do it)

Question

I am running the Thin server for my Rails app locally. Every time I start it I receive the following message:

Warning: Running `gem pristine --all` to regenerate your installed gemspecs (and deleting then reinstalling your bundle if you use bundle --path) will improve the startup performance of Spring.

Even after I run the command 'gem pristine -all' it takes a long time for the server to restart, and the message then appears again. Why so?

Answer 1

I had the same problem. Looking through the output from gem pristine --all I saw that several gems were being skipped with a message like

Skipped bigdecimal-1.1.0, it is bundled with old Ruby

I reinstalled those gems manually to get rid of the message

gem uninstall bigdecimal
gem install bigdecimal

Answer 2

gem update --system to get rid of the message works for me.