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Re: autoconf doc fixes for `...` gotchas

From: Paul Eggert
Subject: Re: autoconf doc fixes for `...` gotchas
Date: Fri, 28 Jan 2005 13:57:12 -0800
User-agent: Gnus/5.1006 (Gnus v5.10.6) Emacs/21.3 (gnu/linux)

Ralf Wildenhues <address@hidden> writes:

>>      (Limitations of Builtins): Use expr "X...", not expr "x...", as
>>      X insulates us from future changes to Posix.
> Could you be bothered to elaborate what those changes are?

In case POSIX adds a new expr operator starting with "x".
(It's kind of theoretical.)

> If you do this, please also do this (and maybe note the significance of
> X over x):

It's probably not worth worrying users about X over x, but I did change
it to X.  Thanks for mentioning it.

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