Dockerfile

# Use Ubuntu 22.04 as the base image
FROM --platform=linux/amd64 ubuntu:22.04

# Disable prompts during package installation
ENV DEBIAN_FRONTEND=noninteractive

# Install essential tools and 32-bit support for cross-compilation
RUN apt update && apt install -y \
    build-essential \
    gcc \
    g++ \
    curl \
    git \
    wget \
    xorriso \
    mtools \
    grub-common \
    grub-pc-bin \
    grub-efi-amd64-bin \
    qemu-system-x86 \
    make \
    bison \
    flex \
    texinfo \
    libgmp-dev \
    libmpfr-dev \
    libmpc-dev \
    libisl-dev \
    && rm -rf /var/lib/apt/lists/*

# Set up i386 cross compiler (binutils + GCC for i386)
WORKDIR /opt

RUN mkdir /cross && \
    wget https://ftp.gnu.org/gnu/binutils/binutils-2.40.tar.gz && \
    tar -xvzf binutils-2.40.tar.gz && \
    mkdir binutils-build && \
    cd binutils-build && \
    ../binutils-2.40/configure --target=i386-elf --prefix=/cross --disable-nls --disable-werror && \
    make -j$(nproc) && \
    make install

RUN wget https://ftp.gnu.org/gnu/gcc/gcc-13.1.0/gcc-13.1.0.tar.gz && \
    tar -xvzf gcc-13.1.0.tar.gz && \
    cd gcc-13.1.0 && ./contrib/download_prerequisites && \
    mkdir ../gcc-build && \
    cd ../gcc-build && \
    ../gcc-13.1.0/configure --target=i386-elf --prefix=/cross --disable-nls --enable-languages=c --without-headers && \
    make all-gcc -j$(nproc) && \
    make install-gcc

# Add cross compiler to PATH
ENV PATH="/cross/bin:$PATH"

# Default directory when the container starts
WORKDIR /SuneriOS

# Run bash shell by default
CMD ["/bin/bash"]