From: Nobuyoshi Nakada <nobu@...>
Date: 2011-11-17T22:42:40+09:00
Subject: [ruby-core:41106] Re: [ruby-core:41093] Re: [ruby-core:41092] Re: Why doesn’t mkmf’s have_macro add a HAVE_X to $defs?

Hi,

At Thu, 17 Nov 2011 16:18:33 +0900,
Nikolai Weibull wrote in [ruby-core:41093]:
> > You can simply use "#ifdef X".  Why do you need a macro just
> > tells if another macro is defined?
> 
> True, but I wanted to simplify my checks for rb_long2int, which can be
> either a macro or a function.

It's indeed my bad.  In 2.0, I had already changed rb_long2int
a macro regardless the size of long.  But it was late.

Also, have_func in 2.0 can check the function with arguments.

> I guess
> #if defined(HAVE_RB_LONG2INT) || defined(rb_long2int)
> 
> isn���t as bad as I initially thought.

Or, for this specific purpose, you can check if RSTRING_LENINT
(or RARRAY_LENINT) is defined instead.

-- 
Nobu Nakada