How to build lli (LLVM JIT) for RISCV?

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 . 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
, 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:
```
Default target:
x86_64-unknown-linux-gnu
Host CPU: (unknown)
```
But when I typed: llc -version (llc works fine), I got:
```
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,

Start by reproducing the reported lli failure on RISC-V with the LLVM .ll file and compare it with the working llc build. Read the lli and llc version output and the linked LLVM and riscv-gnu-toolchain build instructions. Done means lli can process the .ll file on RISC-V without the incompatible-target error.

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