ARM Hard Float Support

[Joel Sherrill]

Hi

What's the state of the world on ARM hard float support? I was asked by
someone about these options:

-march=armv7-a -mfloat-abi=hard -mfpu=vfpv3-d16

-march=armv7-a+simd

When I test build a simple main(), I end up with a library mismatch which
usually means we are missing a proper multilib variant. I tried this with
the
rtems6 gcc 10 snapshot.

I looked at our gcc t-rtems versus the main one for elf/eabi and those seem
to have a LOT more variants.

Any insight would be appreciated.

--joel
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