[PATCHv3] powerpc: Automatic CPU detection in preconfigure

[Paul E Murphy]

Ping

On 5/11/20 5:10 PM, Paul E. Murphy via Libc-alpha wrote:
> Changes for 3:
>     * update conditional to avoid running on non-ppc machines
> 
> Followup from
> <https://sourceware.org/pipermail/libc-alpha/2020-May/113765.html>
> 
> Changes:
>     * Scan for the first instance of .machine or -mcpu= within the
>       generated assembly file.
>     * Don't try to be smart when guessing.  Only choose valid targets.
>     * Don't make any extra noise
>     * Remove comment about trying to pretty print an error message, just
>       fail in the usual autoconf way.
> 
> Followup from <https://sourceware.org/legacy-ml/libc-alpha/2017-02/msg00164.html>
> 
> ---8<---
> 
> Added a check to detect the CPU value in preconfigure, so that glibc is
> built with the correct --with-cpu value.  And move existing checks into
> preconfigure.ac.
> 
> Co-Authored-By: Carlos Eduardo Seo  <cseo@linux.vnet.ibm.com>
> Co-Authored-By: Tulio Magno Quites Machado Filho  <tuliom@linux.vnet.ibm.com>