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Re:LLVM 8.0.0 Release by steveklabnik on Wednesday March 20, 2019 @12:16PM (#19443675)
rustc has support in-tree for

  riscv32imac-unknown-none-elf
  riscv32imc-unknown-none-elf
  riscv64gc-unknown-none-elf
  riscv64imac-unknown-none-elf
So, it's at least far enough along to have that turned on!
Re:LLVM 8.0.0 Release by bionicbits on Wednesday March 20, 2019 @12:39PM (#19443932)
Nice, was just looking into this!
Re:LLVM 8.0.0 Release by steveklabnik on Wednesday March 20, 2019 @12:49PM (#19444038)
You have to

  $ rustup target add <triple>
to download the pre-compiled libraries, but then it should be a --target <triple> away! As far as I know anyway, I'm sure there are bugs since it's so new.