For building Mesa on Debian

mesa_debian_build.sh

#!/bin/bash

# Notes:
#
# 1. Works for tags and specific hash commits too (override mesa_branch variable with needed value).
#
# 2. By default builds for /opt/mesa-<branch> and places the result in ${HOME}/mnt/vmshare/mesa-<branch>
#    You can override the build deployment location by setting dest_dir. For example this should put it right away
#    in /opt/mesa-<branch>
#
#    dest_dir=/ mesa_debian_build.sh
#
# 3. You can override the Mesa repo and resulting Mesa directory name. For instance, to build Mesa with ray tracing fixes
#    (that development repo is picked just as an example):
#
#    mesa_repo='https://gitlab.freedesktop.org/bnieuwenhuizen/mesa.git' mesa_branch='stable-rt-handles' mesa_dir='/opt/mesa-rt' mesa_debian_build.sh
#
# 4. To use latest llvm snapshot, make sure to configure llvm respository for Debian.
#    For example, create the following apt list: /etc/apt/sources.list.d/llvm.list
#
# deb http://apt.llvm.org/unstable/ llvm-toolchain main
# deb-src http://apt.llvm.org/unstable/ llvm-toolchain main
#
# Sometimes you might want to enable Debian experimental repo for specific version of llvm that's older than latest snapshot, but newer
# than ones in other Debian repos.
#
# 5. Make sure deb-src section is configured for your Debian distro in your apt sources. That's needed to install build development packages.
#

mesa_branch=${mesa_branch:-"main"}
mesa_repo=${mesa_repo:-"https://gitlab.freedesktop.org/mesa/mesa.git"}
base_dir=${base_dir:-"${HOME}/build/mesa"}
src_dir=${src_dir:-"${base_dir}/source"}
build_dir=${build_dir:-"${base_dir}/build"}
patches_dir=${patches_dir:-"${base_dir}/patches"}
use_llvm=${use_llvm:-true}
llvm_ver=${llvm_ver:-"19"}
cpuarch=${cpuarch:-"znver4"} # Zen 4 by default. Change to your arch or "native" accordingly.

build_32=${build_32:-false} # Debian Mesa 32-bit cross compilation is currently broken
build_debug=${build_debug:-false}
verbose=${verbose:-false}
update_sources=${update_sources:-true}
reset_sources=${reset_sources:-true}
apply_patches=${apply_patches:-true}

if [[ "$mesa_branch" != "mesa"* ]]; then
   mesa_dir=${mesa_dir:-"/opt/mesa-${mesa_branch}"}
else
   mesa_dir=${mesa_dir:-"/opt/${mesa_branch}"}
fi

dest_dir=${dest_dir:-"${HOME}/mnt/vmshare/$(basename ${mesa_dir})"}

arch_dir["32"]="x86"
arch_dir["64"]="x86_64"

function assert() {
   rc=$1
   message="$2"
   if ((rc != 0)); then
      echo $message
      exit $rc
   fi
}

function ensure() {
   local rc=1
   while (($rc != 0)); do
      $@
      rc=$?
      if (($rc != 0)); then
         sleep 1
      fi
   done
}

function common_prepare() {
   echo "=== Common setup ===="
   mkdir -p ${dest_dir}
   rm -rfv ${dest_dir}/${mesa_dir}/*

   ensure sudo apt-get install build-essential git

   # Potential clean up of previously created repo directory due to repo URL mismatch.
   if [[ -e "$src_dir" ]]; then
     cd "$src_dir"
     local prev_mesa_repo=$(git config --get remote.origin.url)

     if [[ "$prev_mesa_repo" != "$mesa_repo" ]]; then
       cd $(dirname "$src_dir")
       rm -rfv $(basename "$src_dir")
     fi
   fi

   cd $(dirname "$src_dir")
   if ! [[ -e "$src_dir" ]]; then
     git clone "$mesa_repo" $(basename "$src_dir")
   fi

   cd "$src_dir"

   # If updating, reset is enforced regardless of the $reset_sources, to avoid possible merging confusion.
   if $reset_sources || $update_sources; then
     git reset --hard HEAD
     git clean -df
   fi

   if $update_sources; then
     git checkout main
     git pull --rebase --prune

     git checkout $mesa_branch
     if (($? != 0)); then
        echo "Invalid branch or tag ${mesa_branch}! Aborting"
        exit 2
     fi
   fi

   if $apply_patches; then
      mkdir -p "$patches_dir"
      for patch in ${patches_dir}/*; do
        patch -p 1 < ${patch}
        assert $? "Failed to apply patch ${patch}"
      done
   fi

   mkdir -p "$build_dir"
   rm -rfv ${build_dir}/*
}

function prepare_64() {
   echo "=== Preparing 64-bit build ===="

   ensure sudo apt-get build-dep mesa

   if $use_llvm; then
     ensure sudo apt-get install llvm-${llvm_ver}-dev libclang-${llvm_ver}-dev libpolly-${llvm_ver}-dev
   fi
}

function prepare_32() {
   echo "==== Preparing 32-bit build ===="
   # TODO: all this needs a working method in Debian
   echo "Not supported now"
   return
     
   ensure sudo apt-get install llvm-${llvm_ver}-dev:i386 libclang-${llvm_ver}-dev:i386 gcc-multilib g++-multilib libdrm-dev:i386 libexpat1-dev:i386 libxcb-dri3-dev:i386 libxcb-present-dev:i386 libxshmfence-dev:i386 libxext-dev:i386 libxdamage-dev:i386 libx11-xcb-dev:i386 libxcb-glx0-dev:i386 libxcb-dri2-0-dev:i386 libxxf86vm-dev:i386 libwayland-dev:i386 libsensors4-dev:i386 libelf-dev:i386 zlib1g-dev:i386 libglvnd-core-dev:i386
}

configure_64() {
   echo "==== Configuring 64-bit build ===="
   cd "$build_dir"

   local build_type='plain'
   local debug_flags=''
   local ndebug=true
   local strip_option='--strip'

   if $build_debug; then
      build_type='debug'
      debug_flags='-g'
      ndebug=false
      strip_option=''
   fi

   local llvm_val='disabled'
   if $use_llvm; then
     llvm_val='enabled'
   fi

   local native_config
   read -r -d '' native_config <<EOF
[binaries]
llvm-config = '/usr/bin/llvm-config-${llvm_ver}'
cmake = '/usr/bin/false'
EOF

   export CFLAGS="-march=${cpuarch} ${debug_flags} -O2 -ffile-prefix-map=${HOME}/build=. -fstack-protector-strong -Wformat -Werror=format-security -Wall"
   export CPPFLAGS="-Wdate-time -D_FORTIFY_SOURCE=2"
   export CXXFLAGS="-march=${cpuarch} ${debug_flags} -O2 -ffile-prefix-map=${HOME}/build=. -fstack-protector-strong -Wformat -Werror=format-security -Wall"
   export LDFLAGS="-Wl,-z,relro"

   LC_ALL=C.UTF-8 meson setup "$src_dir" \
--wrap-mode=nodownload \
--buildtype=$build_type \
$strip_option \
--native-file=<(echo "$native_config") \
--prefix="$mesa_dir" \
--sysconfdir=/etc \
--localstatedir=/var \
--libdir="${arch_dir["64"]}" \
-D dri-drivers-path="${arch_dir["64"]}" \
-D vulkan-drivers="['amd']" \
-D vulkan-layers="['device-select','overlay']" \
-D glvnd=true \
-D shared-glapi=enabled \
-D gallium-omx=disabled \
-D b_ndebug=$ndebug \
-D glx-direct=true \
-D gbm=enabled \
-D dri3=enabled \
-D platforms="['x11','wayland']" \
-D gallium-extra-hud=true \
-D gallium-vdpau=disabled \
-D lmsensors=enabled \
-D llvm=$llvm_val \
-D shared-llvm=disabled \
-D gallium-va=enabled \
-D va-libs-path="${arch_dir["64"]}" \
-D video-codecs="['all']" \
-D gallium-drivers="['radeonsi','zink']" \
-D gles1=disabled \
-D sse2=true \
-D gles2=enabled

   assert $? "Configure failed!"
}

configure_32() {
   echo "==== Configuring 32-bit ===="
   echo "Not supported now"
   return
}

function build() {
   echo "==== Building... ===="
   cd "$build_dir"

   if $verbose; then
      LC_ALL=C.UTF-8 ninja -v
   else
      LC_ALL=C.UTF-8 ninja
   fi

   assert $? "build failed!"
}

function publish() {
  cd "$build_dir"
  DESTDIR="$dest_dir" LC_ALL=C.UTF-8 ninja install
}

function clean_64() {
   if $use_llvm; then
     ensure sudo apt-get purge llvm-${llvm_ver}-dev libclang-${llvm_ver}-dev libpolly-${llvm_ver}-dev
   fi

   ensure sudo apt-get autoremove --purge
}

function clean_32() {
   ensure sudo apt-get purge llvm-${llvm_ver}-dev:i386 libclang-${llvm_ver}-dev:i386 libsensors4-dev:i386
   ensure sudo apt-get autoremove --purge
}

################################################

shopt -s nullglob
common_prepare

prepare_64
configure_64
build
publish
clean_64

if ! $build_32; then
   exit
fi

prepare_32
configure_32
build
publish
clean_32

Fixed the empty directory issue, please test.

Fixed the empty directory issue, please test.

where is the fixed code? In another gist? I would like to test, if the problem is solved.
I'm now on Debian bullseye and I can compile the it.
Can you put this script under an official open source licence? I would like to contribute some improvements, for example when you don't use deb-src from bullyseye, yo get an endless loop.

Same gist.

Good point on the need to use deb-src, I have it. I'll add a comment about it to make it more obvious.

great it's working