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From: Paul Eggert
Subject: Re: restrict AC_CONFIG_LIBOBJ_DIR
Date: Wed, 11 May 2005 12:19:10 -0700
User-agent: Gnus/5.1006 (Gnus v5.10.6) Emacs/21.4 (gnu/linux)

Stepan Kasal <address@hidden> writes:

> I wanted to implement this:
> 1) the string can contain only characters -.a-zA-Z_0-9/
> 2) the first character is not /

In that case your regular expression is right.  You also implemented a
3rd restriction "the string must be nonempty" but that's also a POSIX
requirement so it's fine to check this too.

> (Yes, I think path of ../../build-aux can make sense, if the configure
> belongs to a subpackage.)

In that case, why not allow absolute file names too?

Sorry, I'm lost.  Why is it important to restrict the file name
choices here?

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