From: Christopher Croughton <crough45 AT amc DOT de>
Message-Id: <97Nov24.160900gmt+0100.17035@internet01.amc.de>
Subject: Re: Substituting \ for / in make
To: eliz AT is DOT elta DOT co DOT il (Eli Zaretskii)
Date: Mon, 24 Nov 1997 16:07:02 +0100
Cc: crough45 AT amc DOT de, djgpp AT delorie DOT com
In-Reply-To: <Pine.SUN.3.91.971124164432.24907A-100000@is> from "Eli Zaretskii" at Nov 24, 97 03:55:01 pm
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Eli Zaretskii wrote:

> Can you guarantee that they have the minimal DJGPP development suite 
> (djdev) installed?  

Yes - they must be able to compile and link C/C++ programs otherwise it
won't install at all.  In fact they must have binutils as well, because
I use 'ar'.

> If so, use `update' on DOS: it understands forward 
> slashes.  It also won't copy a file if its contents is identical, even if 
> the time stamps differ.

Aha!  That's the sort of thing I was after, thanks.  I'll look that up when
I get home.

> If you need the conversion, use the function $(subst), like this:
> 
> 	$(subst, /,\\,$(DJDIR))
> 
> (it's described in the Make docs, in the chapter named "Functions").
> 
> Beware: non-GNU Make don't usually know about $(subst).

I was trying to make it portable to any minimal make.  However, the DOS
version (where it's needed) will be using GNU make (i.e. the one with
DJGPP) so that's OK.

> All the rest of DJGPP.ENV settings use %DJDIR% to generate all the other 
> directories used by the various ports.  If DJDIR is not set, you will be 
> lost.  DJGPP.ENV arranges for forward slashes to be used because some 
> ported programs (e.g. info.exe) don't like backslashes.

I knew I had seen it somewhere.  However, shouldn't it be stated in th
FAQ or README.1ST if it's so important?  I downloaded them today to check,
and there's no reference in either.

> You shouldn't care if you use $(subst) as above.

True.  If I could depend on 4DOS I wouldn't even need that; if I could 
depend on bash it would be even easier (I could use GNU autoconf, for 
instance).  But one of those ideas should work, anyway.

Thanks,
    Chris C