Re: new macros AC_FUNC_EGREP, AC_FUNC_FGREP for POSIX 1003.1-2001 support

[Paul Eggert]

> From: Akim Demaille <address@hidden>
> Date: 05 Jun 2002 09:57:42 +0200
>
> -  egrep -v '^ *\+' conftest.er1 >conftest.err
> +  grep -v '^ *+' conftest.er1 >conftest.err
> ...
> I've found it the entry point:
>      http://mail.gnu.org/pipermail/autoconf/2000-August/006224.html

That whole thread was a false alarm, as explained in:

http://mail.gnu.org/pipermail/autoconf/2000-August/006263.html

The original problem was that Mathieu Chouquet-Stringer misunderstood
"grep -v '^ *+'".  He incorrectly thought that this command was
equivalent to "grep -v '^ *'".  This led to a cascade of
misunderstandings, unfortunately.  This issue is discussed more
thoroughly in:

http://mail.gnu.org/pipermail/autoconf/2000-August/006253.html

A followup message pointed out that this regexp will not work with
Plan 9 grep, but that's a red herring: Plan 9 uses a regexp syntax
that is compatible with neither grep nor egrep, so there isn't a
prayer of Autoconf working with Plan 9 grep anyway.