--target=powerpc64-linux_altivec: Use rs6000_linux64_override_options()?

[Jan-Benedict Glaw]

Hi!

While checking my bot build logs, I noticed that GCC configured for
--target=powerpc64-linux_altivec will pull in linux64.h and
linuxaltivec.h .

linux64.h
  * Will "#define TARGET_USES_LINUX64_OPT 1" (to make static void
    rs6000_linux64_override_options() available in rs6000.cc).
  * Will "#define SUBSUBTARGET_OVERRIDE_OPTIONS" to use
    rs6000_linux64_override_options().

linuxaltivec.h OTOH
  * Will undef / "#define SUBSUBTARGET_OVERRIDE_OPTIONS  rs6000_altivec_abi = 1"
    and thus no longer use rs6000_linux64_override_options()
  * That triggers a warning (unused-function).

To silence that warning, should linuxaltivec.h undefine
TARGET_USES_LINUX64_OPT? Or set rs6000_altivec_abi=1 and call
rs6000_linux64_override_options()?

Thanks,
  Jan-Benedict

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