Re: _AC_CACHE_DUMP simplified

[Ralf Wildenhues]

* Eric Blake wrote on Tue, Mar 21, 2006 at 01:05:52AM CET:
> >   what would you say about this simplification of _AC_CACHE_DUMP?
> 
> +  case `(ac_space=' '; set | grep ^ac_space) 2>&1` in
> 
> Don't you have to quote leading ^ in portable shell?  As in
> 
> case `(ac_space=' '; set | grep '^ac_space') 2>&1` in

Yes, you do.

$ config.guess
sparc-sun-solaris2.10
$ /bin/sh -c 'echo ^a'
/bin/sh: a: not found

> I searched autoconf.texi, but did not find a definitive answer to
> my question (it did point out that ^ is not portable in filenames,
> and that leading ^ in expr regex is not portable, but did not
> really mention whether bare ^ in shells should be avoided), so
> maybe I'm just propagating an urban legend.

Nope.

Cheers,
Ralf