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

[Bruce Hoult via llvm-dev]

No one has implemented JIT for RISC-V yet.

On Tue, Dec 18, 2018 at 8:20 AM Dogtail L via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> 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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