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Subject: Re: PATCH: Re: duplicate targets in Makefile rule
In-Reply-To: <20000210170351.A19964@thelonious.new.ox.ac.uk> from Adam Spiers
 at "Feb 10, 2000 05:03:51 pm"
To: Adam Spiers <adam@spiers.net>
Date: Thu, 10 Feb 2000 17:11:21 +0000 (GMT)
CC: zsh workers mailing list <zsh-workers@sunsite.auc.dk>
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From: Zefram <zefram@fysh.org>

Adam Spiers wrote:
> zsh.dvi: $(sdir)/zsh.texi
>-	$(TEXI2DVI) $(sdir)/zsh.texi
>+	$(TEXI2DVI) $<

Not portable: $< does not portably exist (and is not at all meaningful) in
an explicit rule.  The original code here is the only safe way to do it.

The only magic make variables that can be portably relied on are $@
(the target, available in all rules) and $< (the source, in implicit
rules only).

-zefram