Deprecate -mflat option on SPARC

[Mark Mitchell]

Eric Botcazou wrote:

>Mark,
>
>This patch documents that the -mflat option is deprecated in GCC 3.4.
>
>The -mflat option instructs the compiler to use the single register window 
>calling conventions on SPARC, instead of the normal register window model.
>It has severe limitations and unnecessarily clutters the SPARC back-end.  The 
>plan is to quickly get rid of it in mainline, so as to switch to full RTL 
>epilogue/prologue, which in turn will lead to the removal of duplicated code 
>in the SPARC back-end.
>
>This was first suggested (privately) by David some time ago.
>
>OK for 3.4 branch?
>  
>
OK, and you do not need changes for doc-only patches to the branch.

Thanks,

-- 
Mark Mitchell
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