Linux RISC-V toolchains uses too new libc6

[matsobdev]

Trying to try riscv-toolchain-14-x86_64-lin.tar.gz in Ubuntu 20.04 and:

libc.so.6: version `GLIBC_2.34' not found 

Could you build it using something older? RISC-V for example provides Ubuntu 18.04 compatible compiler.

[will-v-pi]

We won't be going all the way back to Ubuntu 18.04, but can attempt building with Ubuntu 20.04 until April when it reaches end-of-life. Those toolchains you link to should have very similar performance, so I would recommend using those if you need an older supported version, or alternatively you can use the scripts in this repository to compile the toolchain from source - it should only take an hour or so, and is relatively easy on Linux systems.