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Article #544

Re: even more bugs in make

#544
From: xsimon
Date: Wed, 03 Jun 1987 12:16
24 lines
2007 bytes
In article <2888@cit-vax.Caltech.Edu> fritz@polecat.Caltech.EDU (Fritz Nordby) writes:
>I don't know if this has been noticed before, but there is a severe problem
>with make and Bourne shell scripts.  If the IFS environment variable is set
>when make is invoked, then make resets IFS to an empty string.  This almost
>guarantees that Bourne shell scripts will die horribly.

It's not that it resets it to an empty string explicitly - it's a side-effect
of the way that Make sets up make-variables from the environment list. What
it does is it parses each environ entry for <name>=<value>, and then just
simulates an assignment (such as <name> = <value> inside a Makefile). Of
course, it strips out any "whitespace" between the <name> and the <value> -
which is very embarassing for variables such as IFS in which the whitespace
is an important part of the <value>.
The same problem occurs for ANY variable which has an initial whitespace 
component - the whitespace will get stripped off by Make.


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References: <2888@cit-vax.Caltech.Edu>

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Path: arc1-ca.pugleaf.net!utzoo!utgpu!water!watmath!clyde!rutgers!seismo!mcvax!ukc!its63b!xsimon
From: xsimon@its63b.UUCP
Newsgroups: comp.bugs.sys5
Subject: Re: even more bugs in make
Message-ID: <457@its63b.ed.ac.uk>
Date: Wed, 3-Jun-87 08:16:44 EDT
Article-I.D.: its63b.457
Posted: Wed Jun  3 08:16:44 1987
Date-Received: Sat, 6-Jun-87 06:27:00 EDT
References: <2888@cit-vax.Caltech.Edu>
Reply-To: xsimon@its63b.ed.ac.uk (Simon Brown)
Distribution: world
Organization: Computer Science Department, Edinburgh University
Lines: 24
Keywords: IFS, shell script, make