From: Tanaka Akira <akr@...>
Date: 2006-07-29T17:47:50+09:00
Subject: Re: Problem with ruby 1.9

In article <7d9a1f530607290135y2901da9cxd18c7227c79f0553@mail.gmail.com>,
  "Vincent Isambart" <vincent.isambart@gmail.com> writes:

> When building ruby, make stops after an 'Illegal instruction' that
> occured while running miniruby on ./ext/extmk.rb. After some
> investigation I reduced the code causing an Illegal instruction to 2
> lines :
> def xxx(a) yield end
> xxx('') { break }
>
> This program runs without any problem with ruby 1.8.2, 1.8.4 or event
> the last yarv.
> If the xxx function does not take any argument, it works fine.
> My computer's running Mac OS X 10.4.7 (powerpc-apple-darwin8.7.0).

I think it is a gcc's alloca problem.
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28197

C_ALLOCA may avoid the problem.
For example: ./configure CFLAGS='-O2 -g -DC_ALLOCA'
-- 
Tanaka Akira