clone from here: https://github.com/riscv-collab/riscv-gnu-toolchain/

deps to install:

• bison 3.8.2, remap “bison” to point to homebrew install
• gmake — version 4.4.1 built for aarch64-apple-darwin24.0.0

autoconf command:

./configure --prefix=/Volumes/case-sensitive/opt/riscv --with-arch=rv64gc --with-abi=lp64d

• no gdb
• yes llvm
• yes linux

manual patches:

• might need to do this after recursive repos have been pulled in

• force generate files:

  cd binutils/binutils
  bison -y -o sysinfo.c sysinfo.y
  bison -y -d --defines=sysinfo.h -o sysinfo.c sysinfo.y
  bison -d --defines=arparse.h -o arparse.c arparse.y
  
  cd binutils/ld
  bison -d --defines=ldgram.h -o ldgram.c ldgram.y
  

• brew install ninja

• bison