As mentioned in athenavm/athena#3 (comment) it should be possible to upgrade to a newer mainline Rust which includes a newer LLVM which includes CodeGen support for RV32E (llvm/llvm-project@3ac9fe6). This work is partially done in #2. Unfortunately I'm running into the above error trying to build the toolchain. I made sure to try this using an identical config and environment, which doesn't help. Something must've changed in the Rust/LLVM build process between the two releases but I can't figure out what it is. Some possibly useful notes and resources:

The particular compile command that fails works when I run it using cpp from https://github.com/riscv-collab/riscv-gnu-toolchain. But when I set CC= to that compiler, it fails with a different error:

> CC=/home/lane/opt/riscv/bin/riscv32-unknown-linux-gnu-gcc ./x build --stage 1 --host x86_64-unknown-linux-gnu --target ../riscv32em-athena-zkvm-elf.json compiler/rustc library/std
warning: compiler_builtins@0.1.108: riscv32-unknown-linux-gnu-gcc: error: unrecognized command-line option '-m64'
warning: compiler_builtins@0.1.108: riscv32-unknown-linux-gnu-gcc: error: unrecognized command-line option '-m64'

I tried differentiating the host and guest compilers to no avail:

HOST_CC=gcc CC_riscv64_unknown_linux_gnu=/home/lane/opt/riscv/bin/riscv64-unknown-linux-gnu-gcc CARGO_TARGET_RISCV64_UNKNOWN_LINUX_GNU_LINKER=/home/lane/opt/riscv/bin/riscv64-unknown-linux-gnu-gcc ./build.sh

I'm also having trouble compiling riscv-gnu-toolchain. It seems to partially compile and install when configured as such, but then later to run into errors:

./configure --prefix=$HOME/opt/riscv --with-arch=rv32e --with-abi=ilp32e

In any case it shouldn't be required to build Rust since the build script in this repo works just fine on older Rust without it.

Upgrade Rust, remove LLVM patches #1

Description

Metadata

Metadata

Assignees

Labels

Type

Projects

Milestone

Relationships

Development

Issue actions