Re: failure of cross-compilation detection on BlueGene/L

[Steven G. Johnson]

Ralf Wildenhues wrote:
> * Christian Rössel wrote on Sat, Jun 06, 2009 at 08:52:31AM CEST:
> > at the moment I'm just thinking of an external macro that sets $host if  
> > it is not set by the user. Depending on $cpu and $os of the build system  
> > you check for some special directories (e.g. /bgsys for Blue Gene/P).  
> > Usually todays supercomputers have such special and distinct  
> > directories. This is not the holy grail but works quite reliable for us.  
> > I think that these heuristics is not general and reliable enough to be  
> > included in autoconf/config.guess,
>
> You can try; config.guess is maintained by address@hidden

config.guess should definitely be patched to recognize new host triplets 
for BlueGene and any other missing systems.

However, I think it's a bad idea to make ./configure cross-compile by 
default on these supercomputers, which breaks the expectation on every 
other platform that ./configure should compile for the build system by 
default.