$ brew update; brew upgrade
$ cd xuantie-gnu-toolchain
$ git pull --force
$ git submodule update --remote  --force --recursive  
$ make distclean
$ ./configure --prefix=/opt/riscv-toolchain/xuantie --with-cmodel=medany --enable-multilib --disable-gdb
$ make newlib -j$(nproc)

g++   -g -O2 -DIN_GCC  -DCROSS_DIRECTORY_STRUCTURE  -fno-strict-aliasing -fno-exceptions -fno-rtti -fasynchronous-unwind-tables -W -Wall -Wno-narrowing -Wwrite-strings -Wcast-qual -Wno-error=format-diag -Wmissing-format-attribute -Woverloaded-virtual -pedantic -Wno-long-long -Wno-variadic-macros -Wno-overlength-strings   -DHAVE_CONFIG_H  -DGENERATOR_FILE -fno-PIE  -no-pie -o build/genautomata \
    build/genautomata.o build/rtl.o build/read-rtl.o build/ggc-none.o build/vec.o build/min-insn-modes.o build/gensupport.o build/print-rtl.o build/hash-table.o build/sort.o build/read-md.o build/errors.o ../build-arm-apple-darwin22.4.0/libiberty/libiberty.a -lm
clang: warning: argument unused during compilation: '-no-pie' [-Wunused-command-line-argument]
ld: warning: -no_pie is deprecated when targeting new OS versions
ld: warning: -no_pie ignored for arm64
build/genautomata ../.././riscv-gcc/gcc/common.md ../.././riscv-gcc/gcc/config/riscv/riscv.md \
  insn-conditions.md > tmp-automata.c
/bin/sh ../.././riscv-gcc/gcc/../move-if-change tmp-automata.c insn-automata.c
automatav=$(echo $(LC_MESSAGES=C csplit insn-automata.c /parallel\ compilation/ -k -s {20} -f insn-automata -b "%d.c" 2>&1));\
[ ! "$automatav" ] || grep "match not found" <<< $automatav
make[2]: *** [Makefile:2411: s-automata] Error 1
make[2]: Leaving directory '/Users/jbrunk/Development/riscv/xuantie-gnu-toolchain/build-gcc-newlib-stage1/gcc'
make[1]: *** [Makefile:4429: all-gcc] Error 2
make[1]: Leaving directory '/Users/jbrunk/Development/riscv/xuantie-gnu-toolchain/build-gcc-newlib-stage1'
make: *** [Makefile:553: stamps/build-gcc-newlib-stage1] Error 2

In file included from ../.././riscv-gcc/gcc/config/riscv/riscv.c:7069:
In file included from ../.././riscv-gcc/gcc/config/riscv/riscv-thead.c:4:
../.././riscv-gcc/gcc/config/riscv/riscv-thead-tune.h:1:31: error: non-aggregate type 'const struct riscv_tune_param' cannot be initialized with an initializer list
const struct riscv_tune_param thead_e9_tune_info = {
                              ^                    ~
../.././riscv-gcc/gcc/config/riscv/riscv-thead-tune.h:17:31: error: non-aggregate type 'const struct riscv_tune_param' cannot be initialized with an initializer list
const struct riscv_tune_param thead_c906v_tune_info = {
                              ^                       ~
../.././riscv-gcc/gcc/config/riscv/riscv-thead-tune.h:33:31: error: non-aggregate type 'const struct riscv_tune_param' cannot be initialized with an initializer list
const struct riscv_tune_param thead_c910_tune_info = {
                              ^                      ~
../.././riscv-gcc/gcc/config/riscv/riscv-thead-tune.h:49:31: error: non-aggregate type 'const struct riscv_tune_param' cannot be initialized with an initializer list
const struct riscv_tune_param thead_c908_tune_info = {