How to get rid of this error when trying to run ruby-debug on a ruby script
debugging, ruby
Solution
Ended up solving my problem by installing the gem `debugger` instead: http://rubygems.org/gems/debugger
- Add the gem to your Gemfile: `gem 'debugger', group: [:development, :test]`
- Run bundler: `bundle install`
If you need some guidance on how use the gem follow the video tutorial Creating a blog in 15 minutes with Rails - Part 2. Basically, you need to do two things to interrupt the server rendering a page.
- Add the command `debugger` somewhere in your ruby code. If its a view use `<% debugger %>` instead.
- Start the server with a parameter: `rails server --debugger`
Problem
I followed the instructions from here but still have trouble figuring out the problem. Would be great to hear some suggestions. Thanks in advance! ``` stanley@ubuntu:~/Github/webdev_class/ruby$ gem install ruby-debug19 Fetching: archive-tar-minitar-0.5.2.gem (100%) Fetching: ruby_core_source-0.1.5.gem (100%) Fetching: linecache19-0.5.12.gem (100%) Building native extensions. This could take a while... Fetching: ruby-debug-base19-0.11.25.gem (100%) Building native extensions. This could take a while... Fetching: ruby-debug19-0.11.6.gem (100%) Successfully installed archive-tar-minitar-0.5.2 Successfully installed ruby_core_source-0.1.5 Successfully installed linecache19-0.5.12 Successfully installed ruby-debug-base19-0.11.25 Successfully installed ruby-debug19-0.11.6 5 gems installed Installing ri documentation for archive-tar-minitar-0.5.2... Building YARD (yri) index for archive-tar-minitar-0.5.2... Installing ri documentation for ruby_core_source-0.1.5... Building YARD (yri) index for ruby_core_source-0.1.5... Installing ri documentation for linecache19-0.5.12... Building YARD (yri) index for linecache19-0.5.12... Installing ri documentation for ruby-debug-base19-0.11.25... Building YARD (yri) index for ruby-debug-base19-0.11.25... Installing ri documentation for ruby-debug19-0.11.6... Building YARD (yri) index for ruby-debug19-0.11.6... Installing RDoc documentation for archive-tar-minitar-0.5.2... Installing RDoc documentation for ruby_core_source-0.1.5... Installing RDoc documentation for linecache19-0.5.12... Installing RDoc documentation for ruby-debug-base19-0.11.25... Installing RDoc documentation for ruby-debug19-0.11.6... stanley@ubuntu:~/Github/webdev_class/ruby$ ruby-debug ex39.rb ruby-debug: command not found stanley@ubuntu:~/Github/webdev_class/ruby$ ruby-debug19 ruby-debug19: command not found stanley@ubuntu:~/Github/webdev_class/ruby$ rdebug ex40.rb /home/stanley/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:60:in `require': /home/stanley/.rvm/gems/ruby-1.9.3-p194/gems/ruby-debug-base19-0.11.25/lib/ruby_debug.so: undefined symbol: ruby_current_thread - /home/stanley/.rvm/gems/ruby-1.9.3-p194/gems/ruby-debug-base19-0.11.25/lib/ruby_debug.so (LoadError) from /home/stanley/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:60:in `rescue in require' from /home/stanley/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:35:in `require' from /home/stanley/.rvm/gems/ruby-1.9.3-p194/gems/ruby-debug-base19-0.11.25/lib/ruby-debug-base.rb:1:in `<top (required)>' from /home/stanley/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require' from /home/stanley/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require' from /home/stanley/.rvm/gems/ruby-1.9.3-p194/gems/ruby-debug19-0.11.6/cli/ruby-debug.rb:5:in `<top (required)>' from /home/stanley/.rvm/gems/ruby-1.9.3-p194/gems/ruby-debug19-0.11.6/bin/rdebug:108:in `require_relative' from /home/stanley/.rvm/gems/ruby-1.9.3-p194/gems/ruby-debug19-0.11.6/bin/rdebug:108:in `<top (required)>' from /home/stanley/.rvm/gems/ruby-1.9.3-p194/bin/rdebug:19:in `load' from /home/stanley/.rvm/gems/ruby-1.9.3-p194/bin/rdebug:19:in `<main>' ``` ----------Update--------------------------- I tried uninstalling and reinstalling ruby-debug and linecache, and still failed. Here's the log of what happened: ``` stanley@ubuntu:~/Github/webdev_class/ruby$ gem install linecache Building native extensions. This could take a while... ERROR: Error installing linecache: ERROR: Failed to build gem native extension. /home/stanley/.rvm/rubies/ruby-1.9.3-p194/bin/ruby extconf.rb Can't handle 1.9.x yet *** extconf.rb failed *** Could not create Makefile due to some reason, probably lack of necessary libraries and/or headers. Check the mkmf.log file for more details. You may need configuration options. Provided configuration options: --with-opt-dir --with-opt-include --without-opt-include=${opt-dir}/include --with-opt-lib --without-opt-lib=${opt-dir}/lib --with-make-prog --without-make-prog --srcdir=. --curdir --ruby=/home/stanley/.rvm/rubies/ruby-1.9.3-p194/bin/ruby Gem files will remain installed in /home/stanley/.rvm/gems/ruby-1.9.3-p194/gems/linecache-0.46 for inspection. Results logged to /home/stanley/.rvm/gems/ruby-1.9.3-p194/gems/linecache-0.46/ext/gem_make.out stanley@ubuntu:~/Github/webdev_class/ruby$ gem uninstall linecache INFO: gem "linecache" is not installed stanley@ubuntu:~/Github/webdev_class/ruby$ gem install linecache Building native extensions. This could take a while... ERROR: Error installing linecache: ERROR: Failed to build gem native extension. /home/stanley/.rvm/rubies/ruby-1.9.3-p194/bin/ruby extconf.rb Can't handle 1.9.x yet *** extconf.rb failed *** Could not create Makefile due to some reason, probably lack of necessary libraries and/or headers. Check the mkmf.log file for more details. You may need configuration options. Provided configuration options: --with-opt-dir --with-opt-include --without-opt-include=${opt-dir}/include --with-opt-lib --without-opt-lib=${opt-dir}/lib --with-make-prog --without-make-prog --srcdir=. --curdir --ruby=/home/stanley/.rvm/rubies/ruby-1.9.3-p194/bin/ruby Gem files will remain installed in /home/stanley/.rvm/gems/ruby-1.9.3-p194/gems/linecache-0.46 for inspection. Results logged to /home/stanley/.rvm/gems/ruby-1.9.3-p194/gems/linecache-0.46/ext/gem_make.out stanley@ubuntu:~/Github/webdev_class/ruby$ gem uninstall ruby-debug INFO: gem "ruby-debug" is not installed stanley@ubuntu:~/Github/webdev_class/ruby$ gem install ruby-debug Building native extensions. This could take a while... ERROR: Error installing ruby-debug: ERROR: Failed to build gem native extension. /home/stanley/.rvm/rubies/ruby-1.9.3-p194/bin/ruby extconf.rb Can't handle 1.9.x yet *** extconf.rb failed *** Could not create Makefile due to some reason, probably lack of necessary libraries and/or headers. Check the mkmf.log file for more details. You may need configuration options. Provided configuration options: --with-opt-dir --with-opt-include --without-opt-include=${opt-dir}/include --with-opt-lib --without-opt-lib=${opt-dir}/lib --with-make-prog --without-make-prog --srcdir=. --curdir --ruby=/home/stanley/.rvm/rubies/ruby-1.9.3-p194/bin/ruby Gem files will remain installed in /home/stanley/.rvm/gems/ruby-1.9.3-p194/gems/linecache-0.46 for inspection. Results logged to /home/stanley/.rvm/gems/ruby-1.9.3-p194/gems/linecache-0.46/ext/gem_make.out ```