> - soft: only software emulation
> - softfp + mfpu=xxx: enables the compiler to use FP
> instructions/registers inside functions, but not as function
> parameters. This way, code remains compatible with 'soft' libraries
> - hard: it's a different ABI, where parameters can be passed in FP
> registers, avoiding expensive moves between core and FP registers. But
> such code is not compatible with 'soft' libraries.

You can also do

gcc -dumpspecs
to see what the compiler's defaults are.

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