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Message-ID: <3C8C5198.2020700@ece.gatech.edu>
Date: Mon, 11 Mar 2002 01:41:28 -0500
From: Charles Wilson <cwilson AT ece DOT gatech DOT edu>
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To: cygwin AT cygwin DOT com
CC: James Harvey <james AT ncipher DOT com>
Subject: Re: autoconf 2.52a-1: M4PATH not being honoured through wrapper    script.
References: <014001c1be21$81475b20$898717ac AT grimsby> <3C81C56A DOT 3080802 AT ece DOT gatech DOT edu> <12b501c1c429$9c8464b0$898717ac AT grimsby>
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James Harvey wrote:

> OK, thanks. A colleague of mine noticed a bug, in that:
> 
> export M4PATH=${AUTO_STABLE}/share/autoconf:${M4PATH}
> 
> will set M4PATH to '/foo/share.autoconf:' if it was not previously set, and
> an empty path equates to the current directory, which is probably not what
> was intended.


How do you figure that?  "/foo/share/autoconf:" contains only a single 
directory.  It is not equivalent to "/foo/share/autoconf:."

Anyway, it doesn't really matter -- m4 *always* searches the current 
working directory, regardless of the value of ${M4PATH} or the use of -I 
options.  See 'info m4'.

> This really needs a check to see whether M4PATH was previously
> set, and only appending to it if so. This isn't an issue for PATH because
> you assume it is always set to something.

I don't think it's an issue for M4PATH, either.  (OTOH, your *other* 
bugreport is a valid concern, and I'm fixing that now...)

--Chuck


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