[llvm-dev] How to build lli (LLVM JIT) for RISCV?

[Dogtail L via llvm-dev]

Hi everyone,

I am trying to build a JIT for the RISC-V platform, but I could not figure
out how. Could you provide some hints? Great thanks!

Initially, I found that LLVM has RISCV backend, and I compiled it following
the instructions here <https://github.com/lowRISC/riscv-llvm>. I got a
cross-compiler version of clang (running on x86 and the generated binary
runs on RISC-V), but the lli is still a X86 tool.

Then, I tried to build LLVM with riscv-gnu-toolchain
<https://github.com/riscv/riscv-gnu-toolchain>, and I got many tools such
as llc working on RISC-V properly. However, the lli still could not work
properly. When I tried to process the LLVM bytecode file (.ll file) on
RISC-V using lli, I got the error:
*         error creating EE: No available targets are compatible with this
triple.*
Furthermore, when I typed: *lli -version*, I got:



*  LLVM version 7.0.0svn  DEBUG build with assertions.  Default target:
x86_64-unknown-linux-gnu  Host CPU: (unknown)*
But when I typed: llc -version (llc works fine), I got:
  LLVM version 7.0.0svn
  DEBUG build with assertions.
  Default target: x86_64-unknown-linux-gnu
  Host CPU: (unknown)
  Registered Targets:
    riscv32 - 32-bit RISC-V
    riscv64 - 64-bit RISC-V
    x86     - 32-bit X86: Pentium-Pro and above
    x86-64  - 64-bit X86: EM64T and AMD64
It seems that the lli tool does not support RISC-V target.

Could anyone give me some hints? Thank you so much!!

Best,
Rui
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