From: Peter Zotov <whitequark@...>
Date: 2012-05-28T20:53:09+09:00
Subject: Re: [C exten] extconf.rg and #ifdef

Iñaki Baz Castillo писал 28.05.2012 14:57:
> Hi, depending whether my Ruby C extension is being compiled on *nix 
> or
> Windows, I need some #defines (i.e: OS_UNIX or OS_WIN).
>
> I see no way in MKMF documentation to generate a #define (based on
> RbConfig["host_os"] for example). I've seen some "hacks" in 
> extconf.rb
> like this:
>
> ---------------------------------------
>   def add_define(name)
>     $defs.push("-D#{name}")
>   end
>
>   # If I'm on *nix:
>   add_define "OS_UNIX"
> ---------------------------------------
>
> Is this the most ellegant way? any other solution?
>
> Thanks a lot.

Yeah, that's pretty much how configure scripts work. (More complex ones 
like
that from autoconf create config.h with the definitions, but you're 
unlikely
to need this.)

-- 
   WBR, Peter Zotov.