FROM ubuntu:22.04

RUN apt-get -y update && apt-get install -y --no-install-recommends \
    git curl ca-certificates build-essential sudo python3 file \
    flex libmpfr-dev libgmp-dev libmpc3 libmpc-dev texinfo

RUN curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | bash -s -- -y
ENV PATH="/root/.cargo/bin:${PATH}"
# Not sure why/if this is needed
ENV LIBRARY_PATH=/usr/lib
# Make sure we compile to the right target
ENV OVERWRITE_TARGET_TRIPLE=m68k-elf

RUN mkdir /build
WORKDIR /build

# Install binutils
RUN curl -L https://sourceware.org/pub/binutils/releases/binutils-2.43.tar.xz | tar xJ
RUN mkdir binutils-build && cd binutils-build && \
    ../binutils-2.43/configure --prefix=/usr/local --target=m68k-elf --disable-multilib && \
    make -j $(nproc) && \
    make install

# Install GCC
RUN git clone https://github.com/antoyo/gcc
RUN mkdir gcc-build && cd gcc-build && \
    ../gcc/configure \
        --enable-host-shared \
        --enable-languages=jit \
        --enable-checking=release \
        --disable-bootstrap \
        --disable-multilib \
        --prefix=/usr/local \
        --with-cpu=m68000 \
        --with-arch=m68k \
	    --disable-libmudflap --disable-libgomp --disable-libssp --disable-libquadmath \
	    --disable-libquadmath-support --disable-libsanitizer --disable-libmpx --disable-libstdcxx-verbose \
	    --without-zstd --disable-threads --disable-tls --disable-cet \
        --without-headers \
        --target=m68k-elf && \
    make -j $(nproc) && \
    make install

# Clone source repo
RUN git clone https://github.com/rust-lang/rustc_codegen_gcc.git

# Set gcc path in the rustc_codegen project
RUN echo 'gcc-path = "/usr/local/lib"' > rustc_codegen_gcc/config.toml

# Setup rustup
RUN cd rustc_codegen_gcc && rustup show

# Git config is needed for ./y.sh prepare
RUN git config --global user.email "user@example.com"
RUN git config --global user.name "User"

# Apply hacky patch
COPY 0001-codegen-add-support-for-megadrive.patch /tmp/0001-codegen-add-support-for-megadrive.patch
RUN cd rustc_codegen_gcc && patch -p1 < /tmp/0001-codegen-add-support-for-megadrive.patch && rm /tmp/0001-codegen-add-support-for-megadrive.patch

# Provide compiler-rt source so we can get intrinsics to work. (XXX: currently doesn't)
RUN apt-get install -y unzip  # <- move up.
RUN curl -LO https://github.com/llvm/llvm-project/archive/refs/heads/main.zip && unzip main.zip && rm main.zip
ENV RUST_COMPILER_RT_ROOT=/build/llvm-project-main/compiler-rt/

ENV CHANNEL=release
# Build project
# See https://github.com/rust-lang/rustc_codegen_gcc/blob/master/doc/tips.md#how-to-build-a-cross-compiling-libgccjit
RUN cd rustc_codegen_gcc && ./y.sh prepare --cross
ENV CG_RUSTFLAGS="-Cpanic=abort -Crelocation-model=static -Copt-level=3"

RUN cd rustc_codegen_gcc && ./y.sh build --sysroot --features compiler_builtins/no-f16-f128 --target-triple m68k-unknown-linux-gnu --target /build/rustc_codegen_gcc/target_specs/m68k-unknown-linux-gnu.json --release
# ENV CG_RUSTFLAGS="-Cpanic=abort -Crelocation-model=static -Copt-level=s"

# Build "megapong" PoC
# TODO: Make this a Makefile
RUN git clone https://github.com/ricky26/rust-mega-drive.git
COPY 0001-Make-project-compile-with-GCC.patch /tmp/rust-mega-drive.patch
RUN cd rust-mega-drive && patch -p1 < /tmp/rust-mega-drive.patch && rm /tmp/rust-mega-drive.patch
# Compile rust code
RUN cd rustc_codegen_gcc && ./y.sh cargo build --target /build/rustc_codegen_gcc/target_specs/m68k-unknown-linux-gnu.json --manifest-path /build/rust-mega-drive/examples/megapong/Cargo.toml --release

# Compile entrypoint + stdlib stub (should not be strictly necessary to reproduce)
RUN cd rust-mega-drive/examples/megapong && m68k-elf-gcc -fno-exceptions -mcpu=68000 -T /build/rust-mega-drive/share/ldscripts/megadrive.x entry.S hack.c /build/rust-mega-drive/target/m68k-unknown-linux-gnu/release/libmegapong.a -o out.elf -O2 -nostartfiles -nostdlib -static -nolibc -s -flto -Wl,-gc-sections -ffunction-sections -fdata-sections
RUN cd rust-mega-drive/examples/megapong && m68k-elf-objcopy -O binary out.elf out.md