patch applied (ghc): Turn on optimisation for stage2 when validating

[Ian Lynagh]

On Mon, Sep 01, 2008 at 11:36:32AM +0100, Simon Peyton-Jones wrote:
> 
> | Thu Aug 28 05:48:14 PDT 2008  Ian Lynagh <igloo at earth.li>
> |   * Update the build system to handle building and using haddock2
> |   One side-effect of this is that we need to build the install-utils with
> |   stage2 rather than stage1 as we need the ghc package.
> 
> This looks like another tricky point that might benefit from a clarifying comment to explain why we must build utils twice?  (Or is it once but with stage2, I'm not sure.)  It's so easy to forget these constraints.

This is explained here:
    http://hackage.haskell.org/trac/ghc/wiki/Building/Files#utilslibffi
but I'll add the explanation to utils/Makefile too. I'm not really sure
what docs are best where.


Thanks
Ian