Feature #6251: Magic comments for compile options

• Status: Feedback
• Priority: Normal
• Assignee: matz (Yukihiro Matsumoto)
• Target version: -

[shugo (Shugo Maeda)]

Currently, compile options can be set by RubyVM::InstructionSequence.compile_option=.
However, it takes effect only on code compiled after the options are set.

So, how about to add new magic comments for compile options?
For example, the following code sets the options tailcall_optimization and trace_instruction.

  # -*- tailcall-optimization: true; trace-instruction: false -*-
  
  def fact(n, i = 1)
    if n == 0
      i
    else
      fact(n - 1, n * i)
    end
  end
  p fact(10000)

With the attached patch, magic comments in the main script sets global options, and magic comments in a required library are effective only in that library.

[mame (Yusuke Endoh)]

• Status changed from Open to Assigned

[ko1 (Koichi Sasada)]

• Target version changed from 2.0.0 to 3.0

Sorry, I can't implement it until 2.0 release.

[ko1 (Koichi Sasada)]

• Description updated (diff)
• Status changed from Assigned to Feedback
• Assignee changed from ko1 (Koichi Sasada) to matz (Yukihiro Matsumoto)

I have no idea such magic comment is acceptable or not.

Matz's issue?