Ubuntu 16.04 32-bit VM prep with GCC8/LLVM8 for Mesa drivers

# Ubuntu 16.04 32-bit VM prep with GCC8/LLVM8 for compiling Mesa 32-bit drivers.
#
# Note: This is not a script.
#
# This are the packages and steps I took to get going. Skim through
# and see what you need, but most likely all steps should apply.
# ------------------------------------------------------------

# Add Ubuntu Toolchain PPA for GCC 8
# sudo add-apt-repository -y ppa:ubuntu-toolchain-r/test
# sudo apt update && sudo apt upgrade
# sudo apt install gcc-8 g++-8

# Make GCC 8 the default with the highest priority
# sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-8 800 --slave /usr/bin/g++ g++ /usr/bin/g++-8
# if you have other version, you can add them also with lower priority:
# sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-5 500 --slave /usr/bin/g++ g++ /usr/bin/g++-5
# sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-7 700 --slave /usr/bin/g++ g++ /usr/bin/g++-7
# To change versions at any time:
# sudo update-alternatives --config gcc
#
# Necessary packages for Mesa (Your Mileage May Vary)
# sudo apt install build-essential autoconf autogen libtool bison flex python-mako
# sudo apt install zlib1g-dev x11proto-gl-dev libdrm-dev x11proto-dri2-dev libxcb-dri2-0-dev libx11-xcb-dev libxcb-glx0-dev
# sudo apt install libxfixes-dev libxdamage-dev libxext-dev libx11-dev libxcb-xfixes0-dev libxcb-present-dev libxcb-dri3-dev libelf-dev
# sudo apt install wayland-protocols libwayland-egl-backend-dev libxcb-sync-dev libxshmfence-dev libxrandr-dev libexpat-dev libsensors4-dev
# sudo apt install llvm llvm-7 llvm-8-dev llvm-8-tools vulkan-utils
#
# Add LLVM 8 PPA
# echo "deb http://apt.llvm.org/xenial/ llvm-toolchain-xenial main" | sudo tee /etc/apt/sources.list.d/llvm.list
# wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add -
# sudo apt update && sudo apt upgrade
# sudo apt install libllvm-8-ocaml-dev libllvm8 llvm-8 llvm-8-dev llvm-8-doc llvm-8-examples llvm-8-runtime
# sudo apt install libfuzzer-8-dev lldb-8 lld-8 libc++-8-dev libc++abi-8-dev libomp-8-dev
#
# Setting up LLVM8/clang8 as default
# sudo update-alternatives --install /usr/bin/clang++ clang++ /usr/bin/clang++-8 500
# sudo update-alternatives --install /usr/bin/clang clang /usr/bin/clang-8 500
# sudo update-alternatives --install /usr/bin/llvm-config llvm-config /usr/bin/llvm-config-8 500
#
# If you have older versions:
# sudo apt install llvm-3.9-dev clang-3.9 lldb-3.9 clang++-3.8
#
# Add them to alternatives with lower priority below:
# sudo update-alternatives --install /usr/bin/clang++ clang++ /usr/bin/clang++-3.8 100
# sudo update-alternatives --install /usr/bin/clang clang /usr/bin/clang-3.8 100
# sudo update-alternatives --install /usr/bin/llvm-config llvm-config /usr/bin/llvm-config-3.8 100
#
# sudo update-alternatives --install /usr/bin/clang++ clang++ /usr/bin/clang++-3.9 200
# sudo update-alternatives --install /usr/bin/clang clang /usr/bin/clang-3.9 200
# sudo update-alternatives --install /usr/bin/llvm-config llvm-config /usr/bin/llvm-config-3.9 200

# Have to manually get libglvnd debpkg and libLLVM-8 from a newer distro (bionic/cosmic)
#
# For example:
# http://mirrors.kernel.org/ubuntu/pool/main/libg/libglvnd/libglvnd-core-dev_1.0.0-2ubuntu2_i386.deb
# https://packages.ubuntu.com/bionic/i386/libglvnd0/download
#
# Then install them:
# sudo dpkg -i libglvnd-core-dev.deb
# sudo dpkg -i libglvnd0.deb
# If you run into any issues:
# sudo apt --fix-broken install

# Add oibaf PPA for newer libdrm
# sudo add-apt-repository -y ppa:oibaf/graphics-drivers
# sudo apt update
# sudo apt upgrade libdrm
# sudo apt install libdrm-amdgpu1 libdrm-common libdrm-dev
# sudo apt install vdpauinfo libllvm8 libvdpau-dev libva-dev libclc-dev libclang-8-dev
# sudo apt install mesa-utils libgl1-mesa-glx libgles1-mesa libgles1-mesa-dev