nuttx/include/arch/irq.h:700: Error: unrecognized opcode csrw mstatus,s0', extension zicsr' required

[TaiJuWu]

I try to build rv-virt:smp64

./tools/configure.sh rv-virt:smp64

When compile codes, show this error: nuttxspace/nuttx/include/arch/irq.h:700: Error: unrecognized opcode csrw mstatus,s0', extensionzicsr' required

toolchain: riscv64-unknown-elf-gcc (g2ee5e430018) 12.2.0

[acassis]

@masayuki2009 have you seen this error before?

[masayuki2009]

@TaiJuWu Could you tell us what compiler you are using now? In my understanding, the latest RISC-V compiler needs to specify some extensions.

[TaiJuWu]

Im using riscv64-unknown-elf-gcc (g2ee5e430018) 12.2.0

[masayuki2009]

Im using riscv64-unknown-elf-gcc (g2ee5e430018) 12.2.0

https://xpack.github.io/blog/2022/05/18/riscv-none-elf-gcc-v12-1-0-2-released/

RISC-V ISA updates

Compared to previous releases, starting from 12.x, the compiler implements the new RISC-V ISA, which introduces an incompatibility issue, and builds might throw error messages like unrecognized opcode csrr.

The reason is that csr read/write (csrr*/csrw*) instructions and fence.i instruction were separated from the I extension, becoming two standalone extensions: Zicsr and Zifencei.

The solution is to add _zicsr and/or _zifencei to the -march option, e.g. -march=rv32imac becomes -march=rv32imac_zicsr_zifencei.

[TaiJuWu]

I try to compile code and the compiler option is

riscv64-unknown-elf-gcc -MT ./clock_settime.o  -M '-fno-common' '-Wall' '-Wstrict-prototypes' '-Wshadow' '-Wundef' '-Os' '-fno-strict-aliasing' '-fomit-frame-pointer' '-ffunction-sections' '-fdata-sections' '-g' '-march=rv64imac' '-mabi=lp64' '-mcmodel=medany' '-isystem' '/home/tjwu1217/nuttxspace/nuttx/include' '-D__NuttX__' '-DNDEBUG' '-D__KERNEL__' '-pipe' '-I' '/home/tjwu1217/nuttxspace/nuttx/sched' ./clock/clock_settime.c

I try to use grep to find rv64imac in all repo but it is not exist in this repo. Could you tell me where should I modify this option?

[acassis]

@TaiJuWu did you try to edit arch/risc-v/src/common/Toolchain.defs ?

[TaiJuWu]

@acassis Thank you for your reply. I've compiled the code successfully with your suggestion.