From: gotoken@... (GOTO Kentaro)
Date: 2001-03-06T23:48:22+09:00
Subject: [ruby-talk:12138] Re: NaN, Infinity (Bug?)

In message "[ruby-talk:12132] Re: NaN, Infinity (Bug?)"
    on 01/03/06, Dave Thomas <Dave@PragmaticProgrammer.com> writes:
>I just ran this again on my box here (ruby 1.6.2 (2001-02-02) [i686-linux]):
>
> a = -1.0  		# => -1.0
> a.nan?    		# => false
> a = Math.log(a)	# => NaN
> a.nan?                 # => true
>
>So, there seems to be a difference between a Linux box and a
>Windows/cygwin box. Anyone any ideas?

I ran:

  #include <math.h>
  main(){printf("%f\n", log(-1.0));}

on my Cygwin box with `gcc version 2.95.2 19991024 (release)' and got:

  -Inf

I think this is wrong.  
Should the configure detect this incompatibility?

-- Gotoken