[Bug libc/17869] New: powerpc: powerpc64 build failure with binutils 2.22

[azanella at linux dot vnet.ibm.com]

https://sourceware.org/bugzilla/show_bug.cgi?id=17869

            Bug ID: 17869
           Summary: powerpc: powerpc64 build failure with binutils 2.22
           Product: glibc
           Version: 2.20
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: azanella at linux dot vnet.ibm.com
                CC: drepper.fsp at gmail dot com

GLIBC memset optimization for POWER8 uses the '.machine power8' directive,
which is only supported officially on binutils 2.24+.  This causes a build
failure on older binutils.

Since the requirement of .machine power8 is to correctly assembly the 'mtvsrd'
instruction and it is already handled by the MTVSRD_V1_R4 macro, there is no
really needed of using it.

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