The open-sourced toolchain of RISC-V accepts any kind of extensions as long as they are in the reserved code space, basically out-of-the-box. The current ratify

The open-sourced toolchain of RISC-V accepts any kind of extensions as long as they are in the reserved code space, basically out-of-the-box. The current ratifying body does not hold any special toolchain or legal influence other than its publicity, thus irrelevant in this comparison.