As proposed in https://github.com/riscv-non-isa/riscv-c-api-doc/pull/104 No real compiler-rt implementation, as these are not exposed by Linux.
Compiler-RT ================================ This directory and its subdirectories contain source code for the compiler support routines. Compiler-RT is open source software. You may freely distribute it under the terms of the license agreement found in LICENSE.txt. ================================