FROM ubuntu:focal as build
ARG DEBIAN_FRONTEND=noninteractive
ARG TARGETARCH

SHELL ["/bin/bash", "-c"]
USER root
WORKDIR /root

ENV GCC_VERSION=12.3.0

RUN apt update -qq \
    && apt install -qq -y --no-install-recommends --no-install-suggests \
    gnupg wget software-properties-common build-essential

WORKDIR /root

# Install gcc-12 from source
RUN wget "https://mirrorservice.org/sites/sourceware.org/pub/gcc/releases/gcc-${GCC_VERSION}/gcc-${GCC_VERSION}.tar.gz" \
    && tar xf "gcc-${GCC_VERSION}.tar.gz" \
    && cd "gcc-${GCC_VERSION}" \
    && ./contrib/download_prerequisites \
    && mkdir build && cd build \
    && ../configure --enable-languages=c,c++ --disable-multilib --with-build-config='bootstrap-O3' --prefix='/opt'  \
    && make -j$(nproc) profiledbootstrap && make install-strip \
    && rm -rf /root/*

FROM ubuntu:focal as gcc
WORKDIR /root

RUN apt update -qq && apt autoclean -y && apt autoremove -y 
COPY --from=build /opt /opt

# Rewire to use gcc-12
RUN update-alternatives --install /usr/bin/g++ g++ /opt/bin/g++ 100 \
    && update-alternatives --install /usr/bin/c++ c++ /opt/bin/g++ 100 \
    && update-alternatives --install /usr/bin/gcc gcc /opt/bin/gcc 100 \
    && update-alternatives --install /usr/bin/cc cc /opt/bin/gcc 100 \
    && update-alternatives --install /usr/bin/gcov gcov /opt/bin/gcov 100 \
    && update-alternatives --install /usr/bin/gcov-dump gcov-dump /opt/bin/gcov-dump 100 \
    && update-alternatives --install /usr/bin/gcov-tool gcov-tool /opt/bin/gcov-tool 100 \
    && update-alternatives --install /lib/*-linux-gnu/libstdc++.so.6 libstdc++.so.6 /opt/lib64/libstdc++.so.6 100