build.sh error about gcc

[xuejiazidi]

Hi, I followed the Quickstart to install the risc-v tools. However, I failed to run build.sh:

gcc: error: unrecognized argument in option ‘-mcmodel=medany’ gcc: note: valid arguments to ‘-mcmodel=’ are: 32 kernel large medium small make: [file.o] Error 1 make: Waiting for unfinished jobs.... gcc: error: unrecognized argument in option ‘-mcmodel=medany’ gcc: note: valid arguments to ‘-mcmodel=’ are: 32 kernel large medium small gcc: error: unrecognized argument in option ‘-mcmodel=medany’ gcc: note: valid arguments to ‘-mcmodel=’ are: 32 kernel large medium small gcc: error: unrecognized argument in option ‘-mcmodel=medany’ gcc: note: valid arguments to ‘-mcmodel=’ are: 32 kernel large medium small make: [frontend.o] Error 1 make: [handlers.o] Error 1 make: *** [syscall.o] Error 1

I used Ubuntu 18.04.1 LTS. My gcc version is 4.8.5.

Looking forward to you reply.

[jim-wilson]

You need to use a RISC-V compiler to build RISC-V code. You are trying to use an x86 compiler.

riscv-tools recently changed, and no longer includes a compiler. You have to build that separately and put it on your path. There needs to be a riscv64-unknown-elf-gcc binary on your PATH for the build to work.

Note that riscv-tools includes a few misc tools for hardware developers. If what you really want is a toolchain, then riscv-tools is the wrong place to look. The quick start guide points out a few ways to get a RISC-V compiler. You can also try the github riscv/riscv-gnu-toolchain project for a compiler.

[xuejiazidi]

I want to use the Rocket Chip Generator to generate instantiate the RISC-V Rocket Core. Then simulate the core. riscv-tools are involved in the Rocket Chip Generator Quick Instructions. So I tried to install the riscv-tools.

So I need a RISC-V compiler to build the riscv-tools, is that correct? Should I use riscv/riscv-gnu-toolchain project to build a compiler, then build the riscv-tools?

[jim-wilson]

You can use any method to build the compiler. crosstools-ng one such method. riscv/riscv-gnu-toolchain is another. crosstools-ng is mentioned in the docs before the quickstart section starts.

[xuejiazidi]

Thanks!