gcc 4.2.3 bootstrap *seems* to be broken on AIX 5.3

[Joe Buck]

Thomas> when trying to installl gcc 4.2.3 on AIX 5.3 bootstraps fails in stage3 in configure-target-libmudflap when trying to detect used thread-model:
 
Thomas> Anyone an idea?

On Thu, Feb 14, 2008 at 09:54:17AM -0500, David Edelsohn wrote:
> 	Do not enable Mudflap on AIX.  Mudflap only is supported on
> GNU+Linux and FreeBSD.

> 	When you override default configuration options, other than
> languages and prefix, bootstrap errors are likely to happen.
> Configuration parameters for nls, mudflap, and threads should not be
> changed on AIX.

Ideally, mudflap's configure would detect platforms known not to work,
so that the user would get an error message.