From: Quintus <quintus@...>
Date: 2012-05-28T23:30:45+09:00
Subject: Re: [C exten] extconf.rg and #ifdef

Am 28.05.2012 12:57, schrieb I��aki Baz Castillo:
> 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.
> 

What is wrong with the generic macros the compiler sets itself? If I
remember correctly, every compiler targeting Windows sets a macro called
_WIN32, and I bet there���s something similar for other systems. There
shouldn���t be a need to manually define this in extconf.rb.

Vale,
Marvin

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