[LLVMdev] Path to AutoRegen.sh

[Tanya M. Lattner]

> * I'm using Autoconf 2.61, and it is compatible with the syntax used
>  by LLVM, but AutoRegen.sh insists I need 2.5x.
>
> * There is a bug in the AutoRegen.sh that appears when you try to
>  regenerate configure scripts for your project outside the LLVM
>  source tree: an shell "read" command missing a parameter.
>
> The patch was tested on 2.2, but I think it will work to 2.3 too!
>
> By the way, thank you for the hard work on LLVM. It's amazing!

Some comments:
- Please follow the developers policy for making patches:
http://llvm.org/docs/DeveloperPolicy.html#patches

- I think if we are going to upgrade, we should totally switch to 2.6 
instead of allowing both. This will make diffs easier to read when people 
regenerate the configure script.

- Did you read autoconf/README.txt? Were there no changes to the m4 
macros or configure.ac?

- You should also regenerate the configure script as part of this patch.

- Does libtool also have to be upgraded?

- Lastly, I think we should postpone applying this patch until after the 
2.3 branch creation. I'm leary of making tool changes so close to the 
release.

-Tanya