ruby-debug19 on ruby-1.9.3-preview1 [duplicate]

Question

Possible Duplicate:
Rails 3.1 and Ruby 1.9.3p125: ruby-debug19 still crashes with “Symbol not found: _ruby_threadptr_data_type”

I'm having some problems getting debugging working on the ruby 1.9.3 preview1 release.

I've installed the 1.9.3 using rvm with the following command:

rvm install 1.9.3 --reconfigure --debug -C --enable-pthread

And installed ruby-debug19 with this:

gem install ruby-debug19 -- --with-ruby-include=$rvm_path/src/ruby-1.9.3-preview1

The debug gem installs fine but when I go to open a console with debugging or try anything with a debug flag rails c --debug or rspec spec --debug. I get the following error:

/Users/mario/.rvm/gems/ruby-1.9.3-preview1@project/gems/activesupport-3.0.9/lib/active_support/dependencies.rb:239:in `require': dlopen(/Users/mario/.rvm/gems/ruby-1.9.3-preview1@project/gems/ruby-debug-base19-0.11.25/lib/ruby_debug.bundle, 9): Symbol not found: _ruby_current_thread (LoadError)
  Referenced from: /Users/mario/.rvm/gems/ruby-1.9.3-preview1@project/gems/ruby-debug-base19-0.11.25/lib/ruby_debug.bundle
  Expected in: flat namespace
 in /Users/mario/.rvm/gems/ruby-1.9.3-preview1@project/gems/ruby-debug-base19-0.11.25/lib/ruby_debug.bundle - /Users/mario/.rvm/gems/ruby-1.9.3-preview1@project/gems/ruby-debug-base19-0.11.25/lib/ruby_debug.bundle
    from /Users/mario/.rvm/gems/ruby-1.9.3-preview1@project/gems/activesupport-3.0.9/lib/active_support/dependencies.rb:239:in `block in require'
    from /Users/mario/.rvm/gems/ruby-1.9.3-preview1@project/gems/activesupport-3.0.9/lib/active_support/dependencies.rb:225:in `block in load_dependency'
    from /Users/mario/.rvm/gems/ruby-1.9.3-preview1@project/gems/activesupport-3.0.9/lib/active_support/dependencies.rb:596:in `new_constants_in'
    from /Users/mario/.rvm/gems/ruby-1.9.3-preview1@project/gems/activesupport-3.0.9/lib/active_support/dependencies.rb:225:in `load_dependency'
    from /Users/mario/.rvm/gems/ruby-1.9.3-preview1@project/gems/activesupport-3.0.9/lib/active_support/dependencies.rb:239:in `require'
    from /Users/mario/.rvm/gems/ruby-1.9.3-preview1@project/gems/ruby-debug-base19-0.11.25/lib/ruby-debug-base.rb:1:in `<top (required)>'
    from /Users/mario/.rvm/gems/ruby-1.9.3-preview1@project/gems/activesupport-3.0.9/lib/active_support/dependencies.rb:239:in `require'
    from /Users/mario/.rvm/gems/ruby-1.9.3-preview1@project/gems/activesupport-3.0.9/lib/active_support/dependencies.rb:239:in `block in require'
    from /Users/mario/.rvm/gems/ruby-1.9.3-preview1@project/gems/activesupport-3.0.9/lib/active_support/dependencies.rb:225:in `block in load_dependency'
    from /Users/mario/.rvm/gems/ruby-1.9.3-preview1@project/gems/activesupport-3.0.9/lib/active_support/dependencies.rb:596:in `new_constants_in'
    from /Users/mario/.rvm/gems/ruby-1.9.3-preview1@project/gems/activesupport-3.0.9/lib/active_support/dependencies.rb:225:in `load_dependency'
    from /Users/mario/.rvm/gems/ruby-1.9.3-preview1@project/gems/activesupport-3.0.9/lib/active_support/dependencies.rb:239:in `require'
    from /Users/mario/.rvm/gems/ruby-1.9.3-preview1@project/gems/ruby-debug19-0.11.6/cli/ruby-debug.rb:5:in `<top (required)>'
    from /Users/mario/.rvm/gems/ruby-1.9.3-preview1@global/gems/bundler-1.0.17/lib/bundler/runtime.rb:68:in `require'
    from /Users/mario/.rvm/gems/ruby-1.9.3-preview1@global/gems/bundler-1.0.17/lib/bundler/runtime.rb:68:in `block (2 levels) in require'
    from /Users/mario/.rvm/gems/ruby-1.9.3-preview1@global/gems/bundler-1.0.17/lib/bundler/runtime.rb:66:in `each'
    from /Users/mario/.rvm/gems/ruby-1.9.3-preview1@global/gems/bundler-1.0.17/lib/bundler/runtime.rb:66:in `block in require'
    from /Users/mario/.rvm/gems/ruby-1.9.3-preview1@global/gems/bundler-1.0.17/lib/bundler/runtime.rb:55:in `each'
    from /Users/mario/.rvm/gems/ruby-1.9.3-preview1@global/gems/bundler-1.0.17/lib/bundler/runtime.rb:55:in `require'
    from /Users/mario/.rvm/gems/ruby-1.9.3-preview1@global/gems/bundler-1.0.17/lib/bundler.rb:120:in `require'
    from /Users/mario/Work/project/config/application.rb:7:in `<top (required)>'
    from /Users/mario/.rvm/gems/ruby-1.9.3-preview1@project/gems/railties-3.0.9/lib/rails/commands.rb:21:in `require'
    from /Users/mario/.rvm/gems/ruby-1.9.3-preview1@project/gems/railties-3.0.9/lib/rails/commands.rb:21:in `<top (required)>'
    from script/rails:6:in `require'
    from script/rails:6:in `<main>'

Answer 1

Here's an alternate solution I found in a Gist by rafaeldx7.

Basically, the solution is to use newer versions of a couple of libraries, linecache19 v0.5.13 & ruby-debug-base19 v0.11.26, neither of which is in the RubyGem repo yet.

# Install with:
# bash < <(curl -L https://raw.github.com/gist/1333785)
#
# Reference: http://blog.wyeworks.com/2011/11/1/ruby-1-9-3-and-ruby-debug

echo "Installing ruby-debug with ruby-1.9.3-p0 ..."

curl -OL http://rubyforge.org/frs/download.php/75414/linecache19-0.5.13.gem
curl -OL http://rubyforge.org/frs/download.php/75415/ruby-debug-base19-0.11.26.gem

gem install linecache19-0.5.13.gem ruby-debug-base19-0.11.26.gem -- --with-ruby-include=$rvm_path/src/ruby-1.9.3-p0/

rm linecache19-0.5.13.gem ruby-debug-base19-0.11.26.gem

echo "Done."

Answer 2

EDIT: The git-pinning solution worked at first, but I haven't been able to use it consistently. I'll leave it here because people have upvoted it, but I think my ruby-debug CLI worked by chance since it's packaged in an unconventional way.

I'd recommend using pry instead; it seems to be ruby-debug and more. Also, I've used require 'debug' for a while too, mentioned at the top of the answer (and possibly what people were upvoting) and the scope it drops you in is usually not what you expect. Again, use pry (and note that if you want debugger-like stepping, you also need this pry plugin, which I haven't yet needed/tested).

---

Saw Rails with ruby-debugger throw 'Symbol not found: _ruby_current_thread (LoadError)' (summary: you can use 1.9s built in debugger for now) just after I figured out the following:

Since I notice you're trying to get it to work with Rails, in case you're using bundler, you can add this to your gemfile:

gem 'linecache19', :git => 'https://github.com/mark-moseley/linecache.git' 
gem 'ruby-debug-base19', :git => 'https://github.com/mark-moseley/ruby-debug.git'

then execute:

bundle config build.ruby-debug-base19 --with-ruby-include="$rvm_path/src/$(rvm tools strings)/"
bundle install