Re: [patches] Add support for --with-arch configure option

["Joseph S. Myers" <joseph@xxxxxxxxxxxxxxxx>]

On Fri, 15 Aug 2008, Andreas Krebbel wrote:

> Hello,
> 
> glibc configure currently accepts the --with-cpu=x parameter doing two
> things:
> 
> 1. Compile everything with -mcpu=x
> 2. Append x to the sysdeps paths when looking for the files to be built.
> 
> In GCC -mcpu has been replaced by -march/-mtune in order to be able
> change the scheduling policy without depending on the architecture.
> So there are targets (e.g. S/390) which do not support -mcpu anymore.
> 
> The attached patch adds the --with-arch configure option having the
> same effect as --with-cpu regarding point 2 but passing the -march=x
> option to GCC instead of -mcpu.
> 
> This is a prerequisite for supporting S/390 DFP hardware support in
> eglibc.
> 
> Please apply to DFP and mainline branch if it is OK.

I see nothing EGLIBC-specific about this; have you also submitted it for 
FSF GLIBC?  I'd like to see Roland's comments on it, if any, as I think he 
has the best understanding of the principles of how this configure support 
is meant to be designed.  (For example, he might have a view on whether 
you should keep the option as --with-cpu but make it map to -march on some 
targets.)

-- 
Joseph S. Myers
joseph@xxxxxxxxxxxxxxxx