RISC-V Dependent Features
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Options
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The following table lists all availiable RISC-V specific options

-m32 | -m64
     Select the base ISA, either RV32 or RV64.

-mrvc
     Enables the C ISA subset for compressed instructions.

-msoft-float | -mhard-float
     Select the floating-point ABI, hard-float has F registers while soft-float doesn't.

-march=ISA
     Select the base isa, as specified by ISA.  For example -march=RV32IMA.