[sr #110360] AC_CANONICAL_HOST sets wrong $host_cpu on Raspberry Pi 3

Follow-up Comment #10, sr #110360 (project autoconf):

@Zack: you are right, that's a cleaner solution. I will do it like that, Thank
you very much :-)

Looking at https://en.wikipedia.org/wiki/ARM_Cortex-A and
https://en.wikipedia.org/wiki/ARM_architecture I would say that cortex-a53 is
a *CPU* (so should be admissible as value for $host_cpu) while armv7l is an
*architecture* and should not be an admissible value for $host_*cpu*.
armcortex-aXX or arm7cortex-aXX might be a compromise to not break scripts
that check for arm*
But that would have to be agreed on with the gcc folks, cf.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70210

If $host_cpu isn't supposed to hold a fitting value for -mcpu, then what is
the recommended way to get a value for -mcpu in the GNU Toolchain? I don't
think that an application programmer should have to deal with that question.

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