# Copyright (c) 2022 The Regents of the University of California
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# stage 1: download the dependencies
FROM ubuntu:20.04 AS stage1

ENV DEBIAN_FRONTEND=noninteractive
RUN apt -y update && apt -y upgrade && apt -y install \
  binutils build-essential libtool texinfo gzip zip unzip patchutils curl git \
  make cmake ninja-build automake bison flex gperf grep sed gawk bc \
  zlib1g-dev libexpat1-dev libmpc-dev libglib2.0-dev libfdt-dev libpixman-1-dev

# stage 2: download the compilers and compile them
FROM stage1 AS stage2
RUN mkdir -p /riscv/_install
WORKDIR /riscv
ENV PATH=`/riscv/_install/bin:$PATH`
RUN git clone https://github.com/riscv/riscv-gnu-toolchain
WORKDIR /riscv/riscv-gnu-toolchain
RUN git checkout 051b9f7ddb7d136777505ea19c70a41926842b96
RUN git submodule update --init --recursive
RUN ./configure --prefix=/riscv/_install --enable-multilib
RUN make linux -j`nproc`
RUN make install

WORKDIR /riscv
RUN git clone https://github.com/llvm/llvm-project.git riscv-llvm
WORKDIR /riscv/riscv-llvm
RUN git checkout 2ef95efb414e215490a222de05cafdffb8054758
RUN ln -s ../../clang llvm/tools || true
RUN mkdir _build
WORKDIR /riscv/riscv-llvm/_build
RUN cmake -G Ninja -DCMAKE_BUILD_TYPE="Release" \
  -DBUILD_SHARED_LIBS=True -DLLVM_USE_SPLIT_DWARF=True \
  -DCMAKE_INSTALL_PREFIX="/riscv/_install" \
  -DLLVM_OPTIMIZED_TABLEGEN=True -DLLVM_BUILD_TESTS=False \
  -DDEFAULT_SYSROOT="/riscv/_install/sysroot" \
  -DLLVM_DEFAULT_TARGET_TRIPLE="riscv64-unknown-linux-gnu" \
  -DLLVM_TARGETS_TO_BUILD="RISCV" \
  ../llvm
RUN cmake --build . --target install -j`nproc`

# stage 3: create a new container with the compiled cross-compilers only
FROM stage1

RUN mkdir -p /riscv/
COPY --from=stage2 /riscv/_install/ /riscv/_install
ENV PATH=/riscv/_install/bin:$PATH