ruby-debug 0.10.1 Broken On Windows

Posted on May 24, 2008

Since the old rails breakpointer quit working in versions of Ruby after 1.8.4, the preferred method for debugging rails has been to use ruby-debug. This is a separate gem, so to install you just do

gem install ruby-debug

However, the current version of ruby-debug (0.10.1) runs into problems on Windows, namely it doesn't work and spews out an error message when you try to run it directly: 

c:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in `gem_original_require': no such file to load -- c:/ruby/
lib/ruby/gems/1.8/gems/linecache-0.42-x86-mswin32/lib/../ext/trace_nums (LoadError)
    from c:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in `require'
    from c:/ruby/lib/ruby/gems/1.8/gems/linecache-0.42-x86-mswin32/lib/tracelines.rb:8
    from c:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in `gem_original_require'
    from c:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in `require'
    from c:/ruby/lib/ruby/gems/1.8/gems/linecache-0.42-x86-mswin32/lib/linecache.rb:63
    from c:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in `gem_original_require'
    from c:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in `require'
    from c:/ruby/lib/ruby/gems/1.8/gems/ruby-debug-base-0.10.1-mswin32/lib/ruby-debug-base.rb:3
    from c:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in `gem_original_require'
    from c:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in `require'
    from c:/ruby/lib/ruby/gems/1.8/gems/ruby-debug-0.10.1/cli/ruby-debug.rb:5
    from c:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in `gem_original_require'
    from c:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in `require'
    from c:/ruby/lib/ruby/gems/1.8/gems/ruby-debug-0.10.1/bin/rdebug:7
    from c:/ruby/bin/rdebug:19:in `load'
    from c:/ruby/bin/rdebug:19

I've found two possible ways to fix this. The first is simply to revert back to ruby-debug version 0.10.0

gem uninstall ruby-debug
gem install ruby-debug --version "=0.10.0"

The other way to fix the problem I found on a ticket in Rails Trac

In the file ruby\lib\ruby\gems\1.8\gems\linecache-0.42-x86-mswin32\lib\tracelines.rb

I changed the line from

require File.join(@@SRCDIR, '..', 'ext', 'tracenums')

to

require File.join(@@SRC_DIR, '..', 'ext', 'extconf.rb')

I suppose the advantage to this method is that you have the newer version of ruby-debug with all it's fixes, although I don't really know what those are.

Tagged with:    | 8 comments

Comments
  1. danimata – May 30, 2008 @ 06:32 AM
    Thanks a lot. This is just what I needed.
  2. Tom – May 31, 2008 @ 05:12 AM
    Worked for me too, thank you!
  3. Brian – June 08, 2008 @ 02:24 PM
    Unfortunately it turns out the workaround in the Rails Trac link doesn't fully work. It fixes the error you mentioned but if you try to set a breakpoint in rdebug you get an internal exception and your debug session ends.
  4. Ryan Svoboda – June 09, 2008 @ 07:16 AM
    Thanks for the help, I ran into the same problem today. It seems like it's better to stay with the previous version of ruby-debug, since as the previous commenter noticed, the workaround doesn't fully fix the problems.
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