How to build riscv-gnu-toolchain to compile P-ext instructions

[infini8-13]

Hi, I have opened issue at riscv-gnu-toolchain repo, but figured users here would be more familiar with issues regarding P-spec. Please find the issue below.
Thanks.

riscv-collab/riscv-gnu-toolchain#1190

[TommyMurphyTM1234]

In case it helps at all these are the instructions that I used recently:

• Are P* extensions supported ? riscv-collab/riscv-gnu-toolchain#1291 (comment)