Re: [Qemu-devel] Re: Stop using "which" in ./configure

[Loïc Minier]

On Wed, Jan 20, 2010, Paolo Bonzini wrote:
> On 01/20/2010 12:37 PM, Loïc Minier wrote:
> >+    # not found
> >+    IFS="$local_ifs"
> If you do this, you should set IFS to space-tab-lf at the beginning of 
> the script, like this:
> 
> IFS=" ""      ""
> "

 Are you saying that I can't backup/restore IFS without setting it
 first?  That would be odd; it works with bash, dash, and zsh here.
 Pointers to affected shell would help me avoid other issues with them.

 Alternatively, I could set IFS in a subshell.

 I checked the autoconf Portable Shell Programming section, but didn't
 find a similar recommendation:
   http://www.gnu.org/software/autoconf/manual/autoconf.html#index-IFS-1639

> or this (better because it does not rely on embedding whitespace 
> characters within the line):
> IFS=`printf ' \t'`"
> "

 If we go that route, perhaps IFS="`printf ' \t\n'`" would be more
 readable?  I'm not sure how common printf is though.

-- 
Loïc Minier