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9.39.1 RISC-V Options

The following table lists all available RISC-V specific options.

-fpic

-fPIC

Generate position-independent code

-fno-pic

Don’t generate position-independent code (default)

-march=ISA

Select the base isa, as specified by ISA. For example -march=rv32ima. If this option and the architecture attributes aren’t set, then assembler will check the default configure setting –with-arch=ISA.

-misa-spec=ISAspec

Select the default isa spec version. If the version of ISA isn’t set by -march, then assembler helps to set the version according to the default chosen spec. If this option isn’t set, then assembler will check the default configure setting –with-isa-spec=ISAspec.

-mpriv-spec=PRIVspec

Select the privileged spec version. We can decide whether the CSR is valid or not according to the chosen spec. If this option and the privilege attributes aren’t set, then assembler will check the default configure setting –with-priv-spec=PRIVspec.

-mabi=ABI

Selects the ABI, which is either "ilp32" or "lp64", optionally followed by "f", "d", or "q" to indicate single-precision, double-precision, or quad-precision floating-point calling convention, or none or "e" to indicate the soft-float calling convention ("e" indicates a soft-float RVE ABI).

-mrelax

Take advantage of linker relaxations to reduce the number of instructions required to materialize symbol addresses. (default)

-mno-relax

Don’t do linker relaxations.

-march-attr

Generate the default contents for the riscv elf attribute section if the .attribute directives are not set. This section is used to record the information that a linker or runtime loader needs to check compatibility. This information includes ISA string, stack alignment requirement, unaligned memory accesses, and the major, minor and revision version of privileged specification.

-mno-arch-attr

Don’t generate the default riscv elf attribute section if the .attribute directives are not set.

-mcsr-check

Enable the CSR checking for the ISA-dependent CRS and the read-only CSR. The ISA-dependent CSR are only valid when the specific ISA is set. The read-only CSR can not be written by the CSR instructions.

-mno-csr-check

Don’t do CSR checking.

-mlittle-endian

Generate code for a little endian machine.

-mbig-endian

Generate code for a big endian machine.