Can you use upstream GCC (GCC 13.0) test? We don't maintain rvv-next any more. All update upstream GCC directely.
https://github.com/gcc-mirror/gcc

@zhongjuzhe Thank you for the information!
Is there some example how to build RISC-V GCC toolchain from upstream source code? (similar to https://github.com/riscv-collab/riscv-gnu-toolchain instructions)
CI logs? Or Dockerfile?

It seems that RISC-V toolchain doesn't bump to latest upstream GCC. I think you can file an issue to @kito-cheng and ask him to update the toolchain.

Here is an simple example to verify that both GCC and LLVM are consisten each other with the same API doc:
https://godbolt.org/z/dz83ozbeb

compiler explorer has showed that both GCC and LLVM are recognizing same API RVV.

I've been able to build riscv-collab toolchain with the latest GCC by updating gcc submodule to master manually. It can build OpenCV with scalable RVV support, but failed to build non-scalable (intrin_rvv.hpp) variant. I'm going to take a closer look. @zhongjuzhe , thank you for guidance!