Lots of rust-lld errors

[NathanMcMillan54]

I started writing a Rust application that looked pretty much exactly the same as the "empty" example, but when I compile it lots of rust-lld errors show up. I'm compiling with riscv32imac-unknown-none-elf, my rustc version is 1.56.

Here are the first 5:

          rust-lld: error: undefined symbol: UserTimer
          >>> referenced by riscv_rt.e45bfb96-cgu.4
          >>>               riscv_rt-5f3b7c942d92931d.riscv_rt.e45bfb96-cgu.4.rcgu.o:(__INTERRUPTS) in archive /home/nathan/Desktop/githubProjects/novusk/target/riscv32i-unknown-none-elf/debug/deps/libriscv_rt-5f3b7c942d92931d.rlib
          
          rust-lld: error: undefined symbol: SupervisorTimer
          >>> referenced by riscv_rt.e45bfb96-cgu.4
          >>>               riscv_rt-5f3b7c942d92931d.riscv_rt.e45bfb96-cgu.4.rcgu.o:(__INTERRUPTS) in archive /home/nathan/Desktop/githubProjects/novusk/target/riscv32i-unknown-none-elf/debug/deps/libriscv_rt-5f3b7c942d92931d.rlib
          
          rust-lld: error: undefined symbol: MachineTimer
          >>> referenced by riscv_rt.e45bfb96-cgu.4
          >>>               riscv_rt-5f3b7c942d92931d.riscv_rt.e45bfb96-cgu.4.rcgu.o:(__INTERRUPTS) in archive /home/nathan/Desktop/githubProjects/novusk/target/riscv32i-unknown-none-elf/debug/deps/libriscv_rt-5f3b7c942d92931d.rlib
          
          rust-lld: error: undefined symbol: UserExternal
          >>> referenced by riscv_rt.e45bfb96-cgu.4
          >>>               riscv_rt-5f3b7c942d92931d.riscv_rt.e45bfb96-cgu.4.rcgu.o:(__INTERRUPTS) in archive /home/nathan/Desktop/githubProjects/novusk/target/riscv32i-unknown-none-elf/debug/deps/libriscv_rt-5f3b7c942d92931d.rlib
          
          rust-lld: error: undefined symbol: SupervisorExternal
          >>> referenced by riscv_rt.e45bfb96-cgu.4
          >>>               riscv_rt-5f3b7c942d92931d.riscv_rt.e45bfb96-cgu.4.rcgu.o:(__INTERRUPTS) in archive /home/nathan/Desktop/githubProjects/novusk/target/riscv32i-unknown-none-elf/debug/deps/libriscv_rt-5f3b7c942d92931d.rlib
          
          rust-lld: error: too many errors emitted, stopping now (use -error-limit=0 to see all errors)

Is there a linker script that I need? What's causing this?

[almindor]

What board/core are you using?

[Disasm]

Is there a linker script that I need? What's causing this?

Yes, you need to pass the linker script name as well as a script with memory definitions in .cargo/config:
https://github.com/riscv-rust/longan-nano/blob/master/.cargo/config
link.x is provided by riscv-rt, but memory.x is usually provided by user or one of the chip support crates.

[NathanMcMillan54]

Thanks! It worked!