riscv.Dockerfile

# RISC-V toolchain with newlib

FROM dockcross/linux-riscv32:latest

ENV DEFAULT_DOCKCROSS_IMAGE riscv

RUN apt-get -yq update && \
    apt-get -yq install clang clang-format less python3-protobuf protobuf-compiler

# newlib can also be built with clang using the following env variables
# CC=clang CFLAGS='--target=riscv32 -march=rv32im'
# and without --target riscv32-unknown-linux-gnu

RUN git clone --depth 1 git://cygwin.com/git/newlib-cygwin.git /tmp/newlib-cygwin/ && \
    mkdir /tmp/newlib-cygwin/newlib/build && \
    cd /tmp/newlib-cygwin/newlib/build && \
    CFLAGS='-DPREFER_SIZE_OVER_SPEED=1 -Os -march=rv32g -mabi=ilp32' ../configure --host riscv32-unknown-linux-gnu --target riscv32-unknown-linux-gnu --enable-multilib --disable-newlib-supplied-syscalls --enable-newlib-nano-malloc --enable-lite-exit --disable-newlib-io-float --enable-newlib-reent-small --disable-newlib-fvwrite-in-streamio --disable-newlib-fseek-optimization --disable-newlib-wide-orient --disable-newlib-unbuf-stream-opt --enable-newlib-nano-formatted-io && \
    make && \
    make install && \
    cd / && \
    rm -rf /tmp/newlib-cygwin/