Re: [PATCH 2/5] docs: mention cost of globbing during variable expansion

[Eric Blake]

On 08/25/2010 05:18 PM, Eric Blake wrote:
> * doc/autoconf.texi (Shell Substitutions)<${var=literal}>:
> Recommend quoting substitutions that might trigger globbing.

Not quite right.  :(

>   AT_SETUP([autom4te preselections])
> -: ${sleep='sleep 1'}   # Command to force different time stamps.
> +: "${sleep='sleep 1'}"       # Command to force different time stamps.

This fails miserably.  The moment you add "" on the outside, the '' on 
the inside no longer operate as quotes, but become part of the variable 
assignment.

And I should have remembered that this was just recently brought up in 
the Austin Group: http://austingroupbugs.net/view.php?id=221, 
http://austingroupbugs.net/view.php?id=255.

I'm working on a patch to better document the intricacies of quoting 
mixed with substitutions, and will fix this regression in the process.

:(

--
Eric Blake   address@hidden    +1-801-349-2682
Libvirt virtualization library http://libvirt.org