[patches] autoconf-it and timestamps

["Peter Seebach" <peter.seebach@xxxxxxxxxxxxx>]

We just had a very, very, weird bug which was hard to reproduce involving  
building multiple copies of eglibc simultaneously from a single source  
tree.

The problem is basically as follows:

* SVN doesn't keep time stamps.
* So configure.in might be newer than configure in a checkout, even if  
configure was built from configure.in.
* So the autoconf-it rule can try to rebuild configure.
* ... Which it rebuilds in the SOURCE directory, not in the build  
directory.
* ... Which has a race condition.

My thoughts are roughly that the autoconf-it rule probably shouldn't be  
modifying the source tree if you're building in another directory -- that  
just seems dangerous.  For our immediate purposes, we're just unilaterally  
touching */configure, but that's... uhm.  Not good.

I don't actually have a patch yet, but I'm sort of thinking about one.

-s
--
Listen, get this.  Nobody, with a good compiler, needs to be justified.