Looks good.

looks good for me as well. but I really would like to hear some comment from @headius and @enebo about adding this to ./lib/ruby/stdlib

@enebo @headius: is this too invasive, or can it be merged?

@pitr-ch is there any reason this cannot be in lib/ruby/truffle? stdlib is mostly for files which are in MRI's stdlib. I think we have some variants like jossl (although I think this is a mistake) but mostly those variants are working around differences between MRI and JRuby.

@enebo This tool is suppose to be loaded in JRuby it can prepare environment to run files with gems in JRuby+Truffle and then run files in the prepared environment. The tool always runs in JRuby it computes required options and then it executes JRuby+Truffle with them. If it is in lib/ruby/truffle it won't be visible to JRuby.

@pitr-ch as I understand it, the tool is executes exclusively via the bin/jruby+truffle

so instead of https://github.com/jruby/jruby/pull/3412/files#diff-0e9caaa4ef2b36ca7f4ea6308854ebd7R3
you could use something like

require File.join(JRuby.runtime.instance_config.jruby_home, 'lib/ruby/truffle/jruby+truffle/runner')

@mkristian ah thanks for the suggestion. Sounds good, I'll update the PR.

@mkristian @enebo updated and ready for merge.

I think travis does not really run into this change. merging.

@pitr-ch thanx for all this shifting around a second time

No problem at all @mkristian. I was a better option.