Rails 3.1 and Ruby 1.9.3p125: ruby-debug19 still crashes with "Symbol not found: _ruby_threadptr_data_type" [duplicate]

Possible Duplicate:
ruby-debug with Ruby 1.9.3?

I had heard rumors that ruby 1.9.3p125 has a solution for the ruby-debug19 problem, so per instructions on the RVM site, I reinstalled 1.9.3:

$ rvm reinstall 1.9.3 --patch debug --force-autoconf
$ ruby -v
  ruby 1.9.3p125 (2012-02-16 revision 34643) [x86_64-darwin11.2.0]

Then:

gem install ruby-debug19

Added this entry to my Gemfile:

gem 'ruby-debug19'

Then:

$ rails server -u         
=> Booting WEBrick
=> Rails 3.1.3 application starting in development on http://0.0.0.0:3000
=> Call with -d to detach
=> Ctrl-C to shutdown server
You need to install ruby-debug to run the server in debugging mode. With gems, use 'gem install ruby-debug'
Exiting

To get past this error I changed my Gemfile entry to:

gem 'ruby-debug19', :require => 'ruby-debug'

Now a new error from the server:

/Users/don/.rvm/gems/ruby-1.9.3-p125/gems/activesupport-3.1.3/lib/active_support/dependencies.rb:240:in `require': dlopen(/Users/don/.rvm/gems/ruby-1.9.3-p125/gems/ruby-debug-base19-0.11.25/lib/ruby_debug.bundle, 9): Symbol not found: _ruby_threadptr_data_type (LoadError)
  Referenced from: /Users/don/.rvm/gems/ruby-1.9.3-p125/gems/ruby-debug-base19-0.11.25/lib/ruby_debug.bundle
  Expected in: flat namespace
 in /Users/don/.rvm/gems/ruby-1.9.3-p125/gems/ruby-debug-base19-0.11.25/lib/ruby_debug.bundle - /Users/don/.rvm/gems/ruby-1.9.3-p125/gems/ruby-debug-base19-0.11.25/lib/ruby_debug.bundle

I'm very confused by the hundreds of posts out there on how to handle this ruby-debug19 issue. I was hoping it had been solved. Apparently not. Any suggestions? (If anyone suggests a patch, please provide step by step instructions on how to apply it. I've struggled with patches in the past.)

Solution 1:

A fork of ruby-debug just called 'debugger' now exists that incorporates many of the fixes people had been deploying on top of ruby-debug19, so you should be able to just change your Gemfile to

gem 'debugger'

... and off you go.

Solution 2:

Long story short: it's not resolved, and official resolution will only come with a new version of ruby-debug19 or ruby-debug-base19. It's pretty aggravating, I know.

I've done a lot of digging on this, too, and I've kept an eye on things since 1.9.3 came out (because we'd love-love-love to use it in production). However, sadly, 1.9.3-p125 doesn't have a fix for ruby-debug. Only ruby-debug19 will have the fix for ruby-debug19, as the authors of ruby-debug19 and ruby-debug-base19 have been working on a patch and have an updated test build working on Ruby 1.9.3… but they haven't released it to the general public. ruby-debug-base19 hasn't seen a release in eons; ruby-debug19 even longer (since '09).

If you're on rvm head, you should be able to install 1.9.3-p125 with the added "falcon patch" found here (and noted about RVM here. This gist seems to have better instructions (it's a newer fork of the older one).

Solution 3:

The best thing to do is just use pry. Its an irb-like replacement for ruby-debug and it works with all version of Ruby with no nasty patching!

https://github.com/pry/pry