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Date: -- (:)
From: Yaron M. Minsky <yminsky@C...>
Subject: Re: [Caml-list] autoconf and caml


Yann Régis-Gianas wrote:
> On Fri, Sep 06, 2002 at 06:56:42AM -0400, Yaron M. Minsky wrote:
> 
>>Yes, but you actually don't really want simple values here, because 
>>sometimes you want to use those values to do conditional compilation, 
>>and ocaml values won't help you with that.
> 
> 	I think conditional compilation cannot be done since modules
> are not first class citizens. The only way I see is to introduce
> preprocessor comands with camlp4.
> 
> 	The question is : what kind of conditional compilation do you
> want ?  If you want something like:
> 
> 	let foo x =
> #ifdef I_LOVE_FOO
> 	  "foo"
> #else
> 	  "bar"
> #endif        
> 
> 	It can be replaced by:
> 
> 	open Config
> 
> 	let foo x = if i_love_foo then "foo" else "bar"
> 
> 	You will not pay a runtime cost because "i_love_foo" is a
> static value and unused code will be trimmed by ocaml compiler.

I personally need real conditional compilation, of the kind that 
requires camlp4 or some other preprocessor.  Sometimes you really need 
that because different modules (and/or different external C code) is 
required on different platforms.

y

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