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[Bug target/81193] PowerPC GCC __builtin_cpu_is and __builtin_cpu_supports should warn about old libraries


https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81193

--- Comment #9 from Michael Meissner <meissner at gcc dot gnu.org> ---
Well in theory we could add yet another switch to enable/disable the warning,
but we have too many switches as it is.

Note, I've put a warning in my development version of the target_clones
patches, and I think I will keep it (my warning is only if you try to use
target_clones on an old system).

We probably should update the gcc documentation to mention this restriction.

Most users won't be able to use __builtin_cpu_<xxx> until their distro updates
to a new glibc (i.e. years).  The Advance Toolchain users will be to use it.

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