baryluk · November 14, 2024 20:45 · baryluk · Apr 13, 2024 · baryluk · Apr 13, 2024
diff --git a/mesa-build.py b/mesa-build.py
 #!/usr/bin/env python3

 # A simple script to build 64-bit and 32-bit Mesa and libdrm on amd64 Debian
 # stable, Debian testing, Debian unstable, and possibly some Ubuntu versions
 # with some tweaks.
 #
 # libdrm is build too, because often version right now in Debian sid and experimental
 # is too old for current mesa git repo. Also it is nice to build debug
 # versions of libdrm when troubleshooting some crashes and bugs.
 #
 # A situation with LLVM on Ubuntu was (is?) not perfect, so you are on your own.
 #
 # If you do not want to or can not use it, modify the script to install and use
 # other LLVM and update LLVMVERSION variable below.
 #
 # It is too complex to handle fully automatically and be future proof. So just
 # edit the script accordingly.
 #
 # By default only drivers for AMD, Intel and software rendering will be built.
 # That will build radeon driver, radv (with ACO and LLVM), llvmpipe, swrast,
 # lavapipe, and zink, with few other minor things.
 #
 # No Nvidia drivers will be compiled. This is to speed up compilation
 # a bit. Modify MESA_COMMON_OPTS to change that.
 #
 # OpenCL support with clover will be built for 64-bit, but you should know
 # the OpenCL support in Mesa still has some bugs, so be aware.
 # Valgrind extra support will be built for 64-bit only too.
 # Otherwise rest (Mesa, OpenGL, Vulkan, Mesa overlay layer, Mesa device selection
 # layer, gallium-nine, zink, lavapipe), will be built for both
 # 64-bit and 32-bit versions.
 #
 # OpenGL ES (GLES) and EGL are also built. Previously it was disabled, as
 # I found not use for it, beyond making compilation slower, but as of 2022,
 # few critical apps require it in some configurations.
 #
 # Similarlly a Wayland support is untested, and probably not enabled.
 # Modify MESA_COMMON_OPTS if needed.
 #
 # Use --buildopt=1 to enable also debug builds, which can build
 # together with optimized builds.
 #
 # The build will be performed in ~/mesa-git directory for you.
 #
 # The source tree will live in ~/mesa-git
 # Built libraries and binaries will be in ~/mesa-git/builddir/build-{amd64,i386}-{dbg,opt}/
 # Libraries and binaries will be installed into ~/mesa-git/installdir/build-{amd64,i386}-{dbg,opt}/
 #
 # After compilation is done, the script will perform a small test with glxinfo,
 # vulkaninfo and vkcube for 2 seconds.
 #
 #
 # After compilation is done, use '. ~/enable-new-mesa-opt.source'
 # (without quotes) in your terminal to enable it.
 # You can add it to your ~/.profile or ~/.bashrc file too.
 #
 # You need to use this '. ~/enable-new-mesa-opt.source' before any other
 # OpenGL / Vulkan app is started from the same terminal. It is not enough to
 # simply do '. ~/enable-new-mesa-opt.source' in a terminal, and the launch
 # steam or some game via desktop shorcut, or other terminal. The changes are
 # local to the terminal / shell you used it to. You can use it in many terminals
 # as you wish.
 #
 # Note that `enable-new-mesa-opt.source` will also automatically enable ACO if
 # available and enable Vulkan Mesa overlay, Gallium HUD, and DXVK HUD.
 # Feel free to modify this script below (line ~280 and ~328) to not do that.
 # Or source the `disable-new-mesa-hud.source` script to undo the HUD stuff.
 #
 # This script will not install libraries system wide, so it is safe to use in
 # parallel with your distro libraries. And even have applications using one
 # or another, or some using optimized libraries and some using debug libraries.
 #
 # To get rid of it simply run:
 #
 # rm -rf ~/mesa-git ~/libdrm-git ~/enable-new-mesa-*.source ~/disable-new-mesa-hud.source ~/mesa-{opt,dbg} ~/zink-{opt,dbg}
 #
 # If you want to use this Mesa's OpenGL / Vulkan for your desktop manager, like
 # Gnome Shell, you are on your own, but it can be probably done some way by
 # putting needed variables in /etc/environment. Maybe...
 # Or tweak INSTALLDIR variable. But few more variables (`-Dprefix` for example)
 # will be needed to be changed. See https://www.mesa3d.org/meson.html for details.
 #
 # By default rerunning this script will reuse builddir and installdirs,
 # and perform incremental build. But it will not fetch new version.
 #
 # To fetch new version of mesa and drm, pass --git-pull=1
 #
 # To do rebuild from scratch. Pass --incremental=0
 #
 # Alternatively, you can do "git pull", then go into proper
 # build subdirectory and recompile, i.e. using:
 #
 #  cd ~/mesa-git/builddir/build-amd64-opt/ && ninja && ninja install
 #
 # Copyright: Witold Baryluk <[email protected]>, 2019-2024
 # License: MIT style license
 # Also thanks for bug reports, contributions and fixes, including, from:
 #   @serhii-nakon, @kofredwan13, @gremble
 #   

 import argparse
 import os
 import shutil
 import subprocess
 import sys


 assert os.getuid() != 0, "Do not run this script under root or using sudo!"

 HOME = os.environ["HOME"]
 assert HOME and not HOME.endswith("/")

 os.chdir(HOME)

 PWD = os.getcwd()

 SOURCEDIR_LIBDRM = f"{HOME}/libdrm-git"
 SOURCEDIR_MESA = f"{HOME}/mesa-git"

 BUILDDIR = f"{PWD}/mesa-git/builddir"
 # Aka prefix, but we put each build into separate subprefix.
 # So in total there will be 4 subprefixes (64-bit optimized, 32-bit optimized,
 # 64-bit debug, 32-bit debug)
 INSTALLDIR = f"{PWD}/mesa-git/installdir"

 USE_SYSTEM_LIBDRM = False  # Set to True to use system libdrm-dev.

 def str2bool(x) -> bool:
    if x.lower() in {"true", "t", "yes", "y", "1"}:
        return True
    if x.lower() in {"false", "f", "no", "n", "0"}:
        return False
    raise Exception("boolean flags can only be true, True, t, yes, y, Y, 1, false, False, f, no, n, N, 0, etc")

 parser = argparse.ArgumentParser(formatter_class=argparse.ArgumentDefaultsHelpFormatter)
 # Show less output, but also do fully automatic apt-get setup not needing any confirmations.
 parser.add_argument("--quiet", help="Run in quiet and automated mode", default=False, type=str2bool)
 parser.add_argument("--debug", help="Run in debug mode", default=False, type=str2bool)
 parser.add_argument("--apt-auto", help="Automatically install required dependencies. If 0, also skip some verifications.", default=True, type=str2bool)
 parser.add_argument("--llvm", help="Select LLVM / libclc / libclang version to use. auto - try to autodetect.", default="auto")
 parser.add_argument("--git-repo-mesa", help="If sourcedir doesn't exist, clone the repo with URL.", default="https://gitlab.freedesktop.org/mesa/mesa.git")
 parser.add_argument("--git-branch-mesa", help="For --git-repo-mesa which branch to checkout.", default="")
 parser.add_argument("--git-repo-libdrm", help="If sourcedir doesn't exist, clone the repo with URL.", default="https://gitlab.freedesktop.org/mesa/drm.git")
 parser.add_argument("--git-branch-libdrm", help="For --git-repo-libdrm which branch to checkout.", default="main")
 parser.add_argument("--git-depth", help="For --git-repo-mesa and --git-repo-libdrm what --depth=N to use.", default=1)
 #parser.add_argument("--git-full-depth", help="For the clone, use full clone, instead of using --depth=1000.", default=False, type=str2bool)
 parser.add_argument("--git-pull", help="Do a git pull for libdrm and mesa in existing git clones, before build.", default=False, type=str2bool)
 #parser.add_argument("--no-clean", help="Don't remove builddir and installdir at the start.", default=False, type=str2bool)
 parser.add_argument("--incremental", help="Don't remove builddir and installdir at the start, but invoke compile and install again.", default=True, type=str2bool)
 #parser.add_argument("--sourcedir", help="Where to put mesa sources.", default=f"{HOME}/mesa-git")
 #parser.add_argument("--builddir", help="Base for the build location.", default=BUILDDIR)
 #parser.add_argument("--installdir", help="Base for the install location.", default=INSTALLDIR)
 parser.add_argument("--build64", help="Build 64-bit version.", default=True, type=str2bool)
 parser.add_argument("--build32", help="Build 32-bit version.", default=True, type=str2bool)

 # Build optimized (-march=native -O2) binaries. If not, only separate debug
 # build is built.
 parser.add_argument("--buildopt", help="Build optimized (-O2 -march=native + debug code disabled) version. (can be enabled with --builddebug, two builds will be created)", default=True, type=str2bool)

 # Build separate debug builds with -O1 -ggdb and Mesa debugging code (extra
 # runtime checks and asserts) present. You can have both BUILDOPT and
 # BUILDDEBUG enabled, and two versions of Mesa will be built, and you can
 # switch between them per-app quickly. It is not recommended to use it in
 # general unless you find an issue in some apps, crashes, or glitches.
 # It is safe to enable building debug builds, even if you are only going to
 # use optimized built. They are completly independent.
 parser.add_argument("--builddebug", help="Build debug (-O1 -ggdb -g3 + asserts / checks enabled) version. (can be enabled with --buildopt, two builds will be created)", default=False, type=str2bool)

 # Use heavy optimizations (-march=native -O3 -free-vectorize -flto -g0) in
 # optimized build. This will take about twice as long to compile, might
 # expose extra bugs in Mesa or GCC, and will make debugging a bit harder.
 # I personally didn't notice any significant performance improvements,
 # but in theory they are slightly faster.
 parser.add_argument("--heavyopt", help="Use additionally -O3 -march=native -flto -g -mf16c -mfpmath=sse ... et al for --buildopt.", default=False, type=str2bool)

 # Build Clover / OpenCL / OpenCL-SPRI-V support for 64-bit. This flag is ignored
 # for 32-bit builds at the moment, but in future it will be used there too.
 parser.add_argument("--buildopencl", help="Include OpenCL support (Clover)", default=True, type=str2bool)

 #parser.add_argument("--buildextras", help="Build extras (i.e. fossilize, shader-db).", default=True, type=str2bool)
 parser.add_argument("--gallium-drivers", help="Drivers to include.", default="radeonsi,r600,zink,virgl,softpipe,llvmpipe")
 # r300 disabled, because it is a very old hardware (more than 20 years). It still works for basic use, but no point compiling it by default here.
 # r600 disabled, because it requires LLVM, but we now try to build without LLVM by default  (meson.build:1765:4: ERROR: Problem encountered: R600 requires LLVM AMD support.)
 # 2024-02-13: Removed iris,crocus,i915 because of complex compilation issues related to meson native: true, intel_clc on amd64
 parser.add_argument("--vulkan-drivers", help="Drivers to include.", default="amd,swrast,virtio")
 # noveau disabled, because (and also because I do not use it) of some bindgen issues: Unable to generate bindings: ClangDiagnostic("/home/user/mesa-git/src/nouveau/winsys/./nouveau_bo.h:41:4: error: unknown type name 'atomic_uint_fast32_t'\n")
 # Note: intel,intel_hasvk,  # disabled due to issues with intel_clc on amd64
 # gfxstream-experimental not enabled because: src/gfxstream/guest/meson.build:30:16: ERROR: Dependency "aemu_base" not found, tried pkgconfig
 parser.add_argument("--wayland", help="Enable / disable wayland support.", default=True, type=str2bool)
 # parser.add_argument("--endchecks", help="Perform post-install tests / sanity checks.", default=True, type=str2bool)
 # parser.add_argument("--uninstall", help="Cleanup everything, sourcedir, builddir, installdir, and generated files, and exit. (Remember to pass --*dir options first, if needed).", default=False, type=str2bool)


 args = parser.parse_args()

 assert len(set([HOME, SOURCEDIR_MESA, SOURCEDIR_LIBDRM, BUILDDIR, INSTALLDIR])) == 5, "All used directories must be unique"

 def maybeprint(*print_args):
    if not args.quiet:
        print(*print_args)

 def run(cmd_args, *, env = None, check: bool = True) -> bool:
    print("Running", *cmd_args)
    try:
        if args.quiet:
            p = subprocess.run(cmd_args, stdout=subprocess.DEVNULL, env=env)
        else:
            p = subprocess.run(cmd_args, env=env)
    except FileNotFoundError:
        print("Command failed:", *cmd_args)
        # I.e. sudo or lsb_release missing
        print("Maybe", cmd_args[0], "is not installed?")
        if check:
            sys.exit(1)
    if check:
        if p.returncode != 0:
            print("Command failed:", *cmd_args)
            print("with exit code:", p.returncode)
            sys.exit(1)
        # p.check_returncode()  # Throws exception, with not too pretty trace
    return p.returncode == 0

 def capture(cmd_args, *, env = None) -> bool:
    p = subprocess.run(cmd_args, stdout=subprocess.PIPE, universal_newlines=True, env=env)
    return p.stdout

 def grep(cmd_stdout: str, pattern: str) -> list[str]:
    assert isinstance(pattern, str)
    return [line.rstrip() for line in cmd_stdout.splitlines() if line.startswith(pattern)]

 # Run CPU intensive parts at low priority so they can run in background,
 # with less interference to other apps.
 NICE = ["nice", "--adjustment=20"]

 assert args.buildopt or args.builddebug, "At least one of the --buildopt and --builddbg is required"
 assert args.build32 or args.build64,  "At least one of the --build32 and --build64 is required"

 if args.build32:
    print("Checking multiarch support ...")
    maybeprint()
    p = capture(["dpkg", "--print-foreign-architectures"])
    if "i386" not in p.splitlines():
        print("No multiarch enabled. Please run (as root) below command:")
        print()
        print("dpkg --add-architecture i386 && apt-get update")
        print()
        print("and then retry this script again.")
        print()
        print("Alternatively run this script with --build32=false option to disable building i386 (32-bit) mesa")
        sys.exit(2)


 APT_INSTALL = [
    "apt-get",
    "install",
    "--option", "APT::Get::HideAutoRemove=1",
    "--option", "quiet::NoProgress=1",
    "--no-install-recommends",
 ]

 if args.quiet:
    APT_INSTALL.extend(["-qq", "--assume-yes", "--no-remove", "--option","Dpkg::Use-Pty=0"])

 SUDO = ["sudo", "--preserve-env=DEBIAN_FRONTEND,APT_LISTCHANGES_FRONTEND,NEEDRESTART_MODE,NEEDRESTART_SUSPEND,DEBIAN_FRONT"]

 new_env = dict(os.environ)
 new_env.update({
    "DEBIAN_FRONTEND": "noninteractive",
    "APT_LISTCHANGES_FRONTEND": "none",
    "NEEDRESTART_MODE": "l",  # list only
    "NEEDRESTART_SUSPEND": "1",  # do not run at all temporarily from apt-get
    "DEBIAN_FRONT": "noninteractive",  # for needrestart, just in case.
 })

 def sudo(cmd_args, check: bool = True):
    return run(SUDO + cmd_args, env=new_env, check=check)

 def maybenewline():
    if not args.quiet:
        print()

 if args.apt_auto and args.build32:
    maybeprint()
    print("Checking base dependency versions on amd64 and i386 ...")
    maybeprint()

    sudo(APT_INSTALL + ["libc6-dev:amd64", "libc6-dev:i386"])

    # Sometimes some packages might reach only one architecture first, and it might
    # be really hard to coinstall some package on both amd64 and i386, when they are
    # out of sync. Check they are in sync first.
    # Note: This can be done nicer using dctrl-tools package, but it is not
    # installed by default or needed.
    v1 = grep(capture(["dpkg", "-s", "linux-libc-dev:amd64"]), "Version")
    v2 = grep(capture(["dpkg", "-s", "linux-libc-dev:i386"]), "Version")
    if v1 != v2:
        print("linux-libc-dev:amd64 and linux-libc-dev:i386 do have different versions!")
        print("Please fix first and then retry.")
        sys.exit(2)
    v1 = grep(capture(["dpkg", "-s", "libc6-dev:amd64"]), "Version")
    v2 = grep(capture(["dpkg", "-s", "libc6-dev:i386"]), "Version")
    if v1 != v2:
        print("libc6-dev:amd64 and libc6-dev:i386 do have different versions!")
        print("Please fix first and then retry.")
        sys.exit(2)
 else:
    maybeprint()
    print("Checking base dependency versions on amd64 ...")
    maybeprint()

    sudo(APT_INSTALL + ["libc6-dev:amd64"])

 try:
    LSB_DIST = capture(["lsb_release", "-is"]).strip()
 except FileNotFoundError as e:
    print("Command failed:", "lsb_release", "-is")
    print("Error:", e)
    # TODO(baryluk): We can bypass lsb_release and read /etc/debian_version maybe
    print("Maybe package lsb-release is not installed?")
    sys.exit(1)
 LSB_VERSION = capture(["lsb_release", "-sr"]).strip()
 DIST_VERSION = LSB_DIST + "_" + LSB_VERSION

 LLVMVERSION = "13"
 GCCVERSION = "11"

 LLVMREPO = []

 LIBCLC_PACKAGES = ["libclc-dev"]

 # Not installing libclc-14-dev will uninstall mesa-opencl-icd, and install pocl-opencl-icd
 # This is suboptimal, but should still work, and OpenCL is not a big thing anyway.

 if DIST_VERSION.startswith("Debian_9"):    LLVMVERSION=7;     GCCVERSION=6  # Stretch
 elif DIST_VERSION.startswith("Debian_10"): LLVMVERSION=8;     GCCVERSION=8  # Buster backports.
 elif DIST_VERSION.startswith("Debian_11"): LLVMVERSION=13;    GCCVERSION=10  # Bullseye
 elif DIST_VERSION.startswith("Debian_12"): LLVMVERSION=14;    GCCVERSION=12; LIBCLC_PACKAGES=["libclc-14-dev"] # Bookworm
 elif DIST_VERSION.startswith("Debian_13"): LLVMVERSION=19;    GCCVERSION=14; LIBCLC_PACKAGES=["libclc-19-dev"] # Trixie
 elif DIST_VERSION == "Debian_testing":     LLVMVERSION=19;    GCCVERSION=14; LIBCLC_PACKAGES=["libclc-19-dev"] # currrently Trixie
 elif DIST_VERSION == "Debian_n/a":         LLVMVERSION=19;    GCCVERSION=14; LIBCLC_PACKAGES=["libclc-19-dev"] # Could be testing or sid # Debian bug #1008735
 elif DIST_VERSION == "Debian_unstable":    LLVMVERSION=19;    GCCVERSION=14; LIBCLC_PACKAGES=["libclc-19-dev"]
 elif DIST_VERSION == "Ubuntu_16.04":       LLVMVERSION="5.0"; GCCVERSION=5  # Good luck with that.
 elif DIST_VERSION == "Ubuntu_18.04":       LLVMVERSION="6.0"; GCCVERSION=8  # or with that.
 elif DIST_VERSION == "Ubuntu_18.10":       LLVMVERSION=7;     GCCVERSION=8
 elif DIST_VERSION == "Ubuntu_19.04":       LLVMVERSION=8;     GCCVERSION=9
 elif DIST_VERSION == "Ubuntu_19.10":       LLVMVERSION=9;     GCCVERSION=9
 elif DIST_VERSION == "Ubuntu_20.04":       LLVMVERSION=10; GCCVERSION=9
 elif DIST_VERSION == "Ubuntu_20.10":       LLVMVERSION=11; GCCVERSION=10
 elif DIST_VERSION == "Ubuntu_21.04":       LLVMVERSION=12; GCCVERSION=10; LIBCLC_PACKAGES=["libclc-12-dev"]
 elif DIST_VERSION == "Ubuntu_21.10":       LLVMVERSION=12; GCCVERSION=11; LIBCLC_PACKAGES=["libclc-12-dev"]
 elif DIST_VERSION == "Ubuntu_22.04":       LLVMVERSION=14; GCCVERSION=12; LIBCLC_PACKAGES=["libclc-14-dev"]
 elif DIST_VERSION == "Ubuntu_22.10":       LLVMVERSION=15; GCCVERSION=12; LIBCLC_PACKAGES=["libclc-15-dev"]
 elif DIST_VERSION == "Ubuntu_23.04":       LLVMVERSION=16; GCCVERSION=13; LIBCLC_PACKAGES=["libclc-16-dev"]
 elif DIST_VERSION == "Ubuntu_23.10":       LLVMVERSION=16; GCCVERSION=13; LIBCLC_PACKAGES=["libclc-16-dev"]
 elif DIST_VERSION == "Ubuntu_24.04":       LLVMVERSION=17; GCCVERSION=13; LIBCLC_PACKAGES=["libclc-17-dev"]
 elif DIST_VERSION == "Ubuntu_24.10":       LLVMVERSION=18; GCCVERSION=14; LIBCLC_PACKAGES=["libclc-18-dev"]
 elif DIST_VERSION == "Linuxmint_21.1":     LLVMVERSION=15; GCCVERSION=12; LIBCLC_PACKAGES=["libclc-15-dev"]
 elif DIST_VERSION == "Linuxmint_21.2":     LLVMVERSION=15; GCCVERSION=12; LIBCLC_PACKAGES=["libclc-15-dev"]
 elif DIST_VERSION == "Pop_22.04":          LLVMVERSION=15; GCCVERSION=12; LIBCLC_PACKAGES=["libclc-15-dev"]
 else:
    print(f"Warning: Distribution '{DIST_VERSION}' is not supported by this script")
    LLVMVERSION = 13
    GCCVERSION = 12

 if args.llvm != "auto":
    LLVMVERSION = args.llvm
    LIBCLC_PACKAGES = [f"libclc-{args.llvm}-dev"]

 LLVMVERSION = str(LLVMVERSION)

 # Main Mesa dependencies which we will install both on amd64 and i386
 #
 # wayland-protocols is :all, and dpkg will install no issues.
 # But bison, flex, pkg-config, glslang-tools we only want amd64 for build.
 #
 # We keep the order in the list same as Meson configure output.
 MAINDEPS = [
    # "linux-libc-dev",  # Probably will be pulled by gcc & co.
    # linux-libc-dev is not libc-dev. It has Linux kernel headers,
    # for use by userspace, 'uapi'.

    "libvdpau-dev",

    "libvulkan-dev",
    # "glslang-tools",  # We only want to install amd64 binary version.

    # "libxvmc-dev",
    "libxv-dev",
    "libva-dev",
    "zlib1g-dev",
    "libzstd-dev",
    "libexpat1-dev",

    # "libdrm-dev",  # We build our own by default now.

    # LLVM stuff

    "libelf-dev",
    "libglvnd-dev",
    # "libglvnd-core-dev",
    # "bison",  # We only want to install amd64 binary version.
    # "flex",  # We only want to install amd64 binary version.

    # "libunwind-dev",

    # pkg-config stuff  # We install it separately, because it is a bit more complex.

    # "libwayland-bin",  # For wayland-scanner. Technically dependency of libwayland-dev
                       # We only want to install amd64 binary version.

    "wayland-protocols",
    "libwayland-dev",
    "libwayland-egl-backend-dev",

    "libx11-dev",
    "libxext-dev",
    "libxfixes-dev",
    "libxcb-glx0-dev",
    "libxcb-shm0-dev",
    "libxcb1-dev",
    "libx11-xcb-dev",
    "libxcb-dri2-0-dev",
    "libxcb-dri3-dev",
    "libxcb-present-dev",
    "libxcb-sync-dev",
    "libxcb-keysyms1-dev",   # Optional, not sure what is this for, but maybe for GALLIUMHUD hotkeys?
    "libxshmfence-dev",
    "x11proto-dev",  # For glproto and dri2proto. Technically dependency of other libx* packages.
    "libxxf86vm-dev",
    "libxcb-xfixes0-dev",
    "libxcb-randr0-dev",
    "libxrandr-dev",

    # "libxdamage-dev",  # I do not see it Meson output, and I do not think is needed. Debian Build-Depends has it.
    "libxcb-sync-dev",  # I don't see it Meson output, but it is in Debian Build-Depends.

    "libsensors-dev",

    # libdrm dependencies from Debian.
    #
    # minus some that can be 64-bit,
    # minus valgrind, minus quilt (debian specific patching) and xsltproc (docs).
    # "meson", "quilt", "xsltproc",
    "libx11-dev",
    # "pkg-config",
    # "xutils-dev",  # X Window System utility programs for development # We can use 64-bit version for 32-bit.
    "libudev-dev",
    "libpciaccess-dev",
    # "python3-docutils",
    # "valgrind",

    "libcunit1-dev",  # Optional. For libdrm tests.

    "liblua5.4-dev",  # Optional. Used be Intel and Freedreno for some extra stuff.
 ]

 if USE_SYSTEM_LIBDRM:
    MAINDEPS.extend(["libdrm-dev"])
 else:
    MAINDEPS.extend(["libcairo-dev"])  # for some libdrm tests


 MAINDEPS64 = []
 MAINDEPS32 = []
 for d in MAINDEPS:
    assert ":" not in d
    MAINDEPS64.append(f"{d}:amd64")
    if args.build32:
        MAINDEPS32.append(f"{d}:i386")

 # For OpenCL support, one might need libclc-dev and libclang-XYZ-dev, to add a parser
 # and some passes from LLVM. (See https://libclc.llvm.org for details). This is AFAIK
 # for Clover subproject in Mesa, which is disabled, but might go forward, especially
 # for Novoue driver, and possibly in the future as a SPIR-V target, which is then
 # consumed by LLVM or by ACO, via NIR again.
 OPENCL_DEPS = []
 if args.buildopencl:
    OPENCL_DEPS = [f"libclang-{LLVMVERSION}-dev:amd64", f"libclang-cpp{LLVMVERSION}-dev"]
    OPENCL_DEPS.extend(LIBCLC_PACKAGES)
    # Polly is optional, but enables various optimisations of OpenCL kernels
    OPENCL_DEPS += [f"libpolly-{LLVMVERSION}-dev:amd64"]
    # if args.builds32:
    #   # https://bugs.debian.org/1055371
    #   OPENCL_DEPS.extend([f"libpolly-{LLVMVERSION}-dev:i386"])

 if args.apt_auto:
    maybeprint()
    if USE_SYSTEM_LIBDRM:
        print("Ensuring dependencies for Mesa (and libdrm) build are installed ...")
    else:
        print("Ensuring dependencies for Mesa build are installed ...")
    maybeprint()

    ALL_PACKAGES = [
        "mesa-utils",  # for glxinfo
        "vulkan-tools",  # for vkcube
        "git",
        "ca-certificates", # for git, just in case, because it is only in Recommends, and is not in base system
        f"gcc-{GCCVERSION}",
        f"g++-{GCCVERSION}",
        # "gcc", "g++",  # for vkpipeline-db, otherwise cmake has issues.
        "pkg-config",
        "meson",
        "ninja-build",
        # "cmake",  # for vkpipeline-db
        "gettext",
        "python3",
        "python3-setuptools",
        "python3-mako",
        "valgrind",
        "bison",
        "flex",
        "dpkg-dev",  # is needed by multi-arch-aware pkg-config when cross-compiling
        "glslang-tools",
        *OPENCL_DEPS,
        "xutils-dev:amd64",  # for libdrm, but these are build utilities, only need amd64 version.

        "bindgen",  # rust ffi via C and C++. For building rusticl OpenCL stuff
        "cbindgen",  # Generates C bindings from Rust code  - used by src/nouveau/nil/

        "rustfmt",
        "librust-paste-dev",
        "librust-syn-dev",
    ]

    if args.build64:
        ALL_PACKAGES.extend([
            *MAINDEPS64,
        ])

    if args.build32:
        ALL_PACKAGES.extend([
            f"gcc-{GCCVERSION}-i686-linux-gnu",
            f"g++-{GCCVERSION}-i686-linux-gnu",
            *MAINDEPS32,
        ])

    if args.buildopencl:
        if LLVMVERSION == "11":
            if args.build64:
                ALL_PACKAGES.append("libllvmspirvlib-dev:amd64")
            if args.build32:
                ALL_PACKAGES.append("libllvmspirvlib-dev:i386")
        elif LLVMVERSION == "13":
            if args.build32:
                ALL_PACKAGES.append(f"libllvmspirvlib-{LLVMVERSION}-dev:amd64")
            # if args.build32:
            #     ALL_PACKAGES.append(f"libllvmspirvlib-{LLVMVERSION}-dev:i386")
        elif LLVMVERSION == "14":
            if args.build64:
                ALL_PACKAGES.append(f"libllvmspirvlib-{LLVMVERSION}-dev:amd64")
            if args.build32:
                if DIST_VERSION not in {"Ubuntu_22.04", "Linuxmint_21.1", "Pop_22.04"}:
                    ALL_PACKAGES.append(f"libllvmspirvlib-{LLVMVERSION}-dev:i386")
        else:
            if args.build64:
                ALL_PACKAGES.append(f"libllvmspirvlib-{LLVMVERSION}-dev:amd64")
                ALL_PACKAGES.append(f"llvm-spirv-{LLVMVERSION}:amd64")
            if args.build32:
                ALL_PACKAGES.append(f"libllvmspirvlib-{LLVMVERSION}-dev:i386")

    if args.wayland:
        ALL_PACKAGES.extend([
            "wayland-protocols",
            "libwayland-bin",
        ])

    # Install directx-headers-dev for amd64 only for now.

    # Note: We need glslangValidator to compile trivial GLSL code into SPV for Vulkan Mesa overlay.
    # Compilers and cross compilers. Will automatically install binutils (for ar, strip, etc.).
    sudo(APT_INSTALL + ALL_PACKAGES)

 # Allow installation of directx-headers-dev:amd64 to fail.
 # It is now in testing (bookworm) and unstable, as of 2022-02-08.
 # It is also in current stable (since release of bookworm, middle 2023).
 # TODO: So maybe test with it included unconditionally.
 if args.apt_auto:
    if not sudo(APT_INSTALL + ["directx-headers-dev:amd64"], check=False):
        print("Warning: Can not install directx-headers-dev:amd64. Consider switching to Debian unstable / Debian bookworm to get it.")

 if not USE_SYSTEM_LIBDRM:
    # TODO(baryluk): Separate dependencies for libdrm. I.e. xutils-dev:amd64, and libpciaccess-dev, libudev-dev.
    pass

 if args.apt_auto:
    maybeprint()
    maybeprint()
    print(f"Attempting to install llvm{LLVMVERSION} ... If it fails, please read the source code how to add proper repos...")
    maybeprint()
    maybeprint()
    LLVM_PACKAGES = [
        f"libllvm{LLVMVERSION}",
        f"libllvm{LLVMVERSION}:amd64",
        f"llvm-{LLVMVERSION}-dev",
    ]
    LLVM_PACKAGES_DBG=[
        f"libllvm{LLVMVERSION}-dbgsym:amd64",
    ]
    if args.build32:
        LLVM_PACKAGES += [
            f"libllvm{LLVMVERSION}:i386",
            # f"llvm-{LLVMVERSION}:i386",
        ]
        LLVM_PACKAGES_DBG += [
            f"libllvm{LLVMVERSION}-dbgsym:i386",
        ]

    sudo(APT_INSTALL + LLVMREPO + LLVM_PACKAGES)
    if not sudo(APT_INSTALL + LLVMREPO + LLVM_PACKAGES_DBG, check=False):
        print("Warning: Can't install debug symbols. Enable them: https://wiki.debian.org/HowToGetABacktrace")

 # No need to install pkg-config:i386, it would conflict with pkg-config:amd64.
 # Debian's pkg-config will automatically create symlinks to all supported
 # archs to proper wrapper that sets proper paths.

 # A 32-bit version of pkg-config, that actually is a wrapper, that knows how to
 # filter various libraries and multiple versions of them.
 # removes pkg-config:amd64, but kind of fine for a moment. We still can use the
 # properly prefixed versions all the time!

 GIT_QUIET_ARG = ["--quiet"] if args.quiet else []

 if not USE_SYSTEM_LIBDRM:
    maybeprint()
    print("Checking libdrm git repo ...")
    maybeprint()

    if not os.path.exists(SOURCEDIR_LIBDRM):
        if args.git_depth != "":
            GIT_DEPTH_ARG = [f"--depth={args.git_depth}"]
        if args.git_branch_libdrm:
            GIT_BRANCH_ARG = [f"--branch={args.git_branch_libdrm}", "--single-branch"]
        else:
            GIT_BRANCH_ARG = []
        run(["git", "clone", *GIT_QUIET_ARG, *GIT_DEPTH_ARG, *GIT_BRANCH_ARG, args.git_repo_libdrm, SOURCEDIR_LIBDRM])
        if args.git_branch_libdrm:
          run([*NICE, "git", "-C", SOURCEDIR_LIBDRM, "checkout", *GIT_QUIET_ARG, args.git_branch_libdrm])
    else:
        if args.git_pull:
            run([*NICE, "git", "-C", SOURCEDIR_LIBDRM, "pull", *GIT_QUIET_ARG])
        else:
            print(f"libdrm-git repo already present. To update, use --git-pull=1 option or run \"cd '{SOURCEDIR_LIBDRM}' && git pull\" manually.")
    maybeprint()


 maybeprint()
 print("Checking mesa git repo ...")
 maybeprint()

 if not os.path.exists(SOURCEDIR_MESA):
    if args.git_depth != "":
        GIT_DEPTH_ARG = [f"--depth={args.git_depth}"]
    if args.git_branch_mesa:
        GIT_BRANCH_ARG = [f"--branch={args.git_branch_mesa}", "--single-branch"]
    else:
        GIT_BRANCH_ARG = []
    run(["git", "clone", *GIT_QUIET_ARG, *GIT_DEPTH_ARG, *GIT_BRANCH_ARG, args.git_repo_mesa, SOURCEDIR_MESA])
    if args.git_branch_mesa:
        run([*NICE, "git", "-C", SOURCEDIR_MESA, "checkout", *GIT_QUIET_ARG, args.git_branch_mesa])
 else:
    if args.git_pull:
        run([*NICE, "git", "-C", SOURCEDIR_MESA, "pull", *GIT_QUIET_ARG])
    else:
        print(f"mesa-git repo already present. To update, use --git-pull=1 option or run \"cd '{SOURCEDIR_MESA}' && git pull\" manually.")

 maybeprint()


 # OPENCL_SUPPORT = ["-Dgallium-opencl=icd","-Dopencl-spirv=true"]
 # For "-Dopencl-spirv=true". Also in Debian this version is based on LLVM8 at
 # the moment.
 if args.apt_auto:
    # sudo(APT_INSTALL + ["libllvmspirvlib-dev"])
    pass

 # Required for parsing OpenCL when gallium-opencl is enabled.
 # The clang-cpp component can be skipped, but helps with some stuff apparently.
 if args.apt_auto:
    sudo(APT_INSTALL + [f"libclang-{LLVMVERSION}-dev", f"libclang-cpp{LLVMVERSION}-dev:amd64"])


 os.chdir(SOURCEDIR_MESA)

 # These are roots of the build and install.
 # Actuall build and install will happen in various
 # subdirectories, for mesa, libdrm, 32-bit & 64-bit, opt & dbg.

 if not args.incremental:
    print()
    print(f"Cleaning previous build directory {BUILDDIR}")
    try:
        shutil.rmtree(BUILDDIR)
    except FileNotFoundError:
        pass
    print()
    print(f"Cleaning previous install directory {INSTALLDIR}")
    try:
        shutil.rmtree(INSTALLDIR)
    except FileNotFoundError:
        pass
    print()

 COMMON_OPTS = []

 COMMON_OPTS_64 = []
 COMMON_OPTS_32 = []

 MESA_COMMON_OPTS = []
 MESA_COMMON_OPTS += (["-Dplatforms=x11,wayland"] if args.wayland else ["-Dplatforms=x11"])

 MESA_COMMON_OPTS += [
    "-Dgallium-extra-hud=true",
    f"-Dvulkan-drivers={args.vulkan_drivers}",
    f"-Dgallium-drivers={args.gallium_drivers}",
    "-Dshader-cache=enabled",
    "-Dvulkan-layers=device-select,overlay,screenshot",  # intel-nullhw
    "-Dopengl=true",
    "-Dgles1=enabled",
    "-Dgles2=enabled",
    "-Degl=enabled",
    "-Dllvm=enabled",
    "-Dlmsensors=enabled",
    "-Dtools=glsl,nir",
    "-Dgallium-vdpau=enabled",
    # "-Dgallium-xvmc=enabled",
    "-Dgallium-va=enabled",
    "-Dglvnd=enabled",
    "-Dgbm=enabled",
    #"-Dglx=gallium-xlib",
    "-Dlibunwind=enabled",  # (also need to disable unwind due to multi-arch issues)
    "-Dosmesa=true",
    "-Dgallium-nine=true",
    "-Dvideo-codecs=vc1dec,h264dec,h264enc,h265dec,h265enc,av1dec,av1enc,vp9dec",
    "-Dlegacy-x11=dri2",
    "-Dteflon=true",
    "-Dzstd=enabled",
    # "-Dllvm-orcjit=true",  # for llvmpipe
    # "-Dintel-clc=enabled",
    # "-Dintel-rt=enabled",
    # "-Dvulkan-beta=true",
    # "-Dshared-llvm=disabled",  # Causes linking issues on 32-bit with llvm, because of extra linking to libz3.so, which (because we are using 64-bit llvmconfig), uses 64-bit version and fails to link.
    # "-Damd-use-llvm=false",  # Note, meson.build:1765:4: ERROR: Problem encountered: R600 requires LLVM AMD support.
    "-Dspirv-to-dxil=true",
    "-Dshader-cache-max-size=8G",
    "-Dstatic-libclc=all",
    # "-Dopencl-spirv=true",  # This option is gone, because Clover was essentially removed from NIR in Mesa. Use Rusticl. # Old comment: Enabled separately only for 64-bit, and not for 32-bit. This is due to multi-arch bug https://bugs.debian.org/1023780
    # "-Dgallium-opencl=icd",  # This one causes issues on i386. So we enable it later only for amd64.
    # "-Dgallium-rusticl=true",  # Enabled seaprately only for 64-bit, and not for 32-bit. Various issues. rustc in debian not multi-arch, needing to use rustup, plus complications in spirv-tools and llvm libraries
    # "-Dgallium-xa=enabled", # meson.build:680:3: ERROR: Feature gallium-xa cannot be enabled: XA state tracker requires at least one of the following gallium drivers: nouveau, freedreno, i915, svga.
    # "-Dsplit-debug=enabled",
 ]

 # TODO(baryluk):

 # When doing --gallium-drivers=radeonsi,zink --vulkan-drivers=amd:
 # meson.build:709:4: ERROR: Problem encountered: XVMC state tracker requires at least one of the following gallium drivers: r600, nouveau.
 # meson.build:880:4: ERROR: Problem encountered: The nine state tracker requires gallium softpipe/llvmpipe.
 # meson.build:1975:4: ERROR: Problem encountered: OSMesa gallium requires gallium softpipe or llvmpipe.


 # Interesingly enough, "-Dopencl-spirv=true" compiles even without
 # libllvmspirvlib-dev installed.

 #"-Dintel-clc=enabled" causes issues:
 # src/intel/compiler/meson.build:173:2: ERROR: Tried to mix libraries for machines 0 and 1 in target 'intel_clc' This is not possible in a cross build.

 # When doing -Dsplit-debug=enabled we got:
 # meson.build:934:3: ERROR: Feature split-debug cannot be enabled: split-debug requires the linker argument -Wl,--gdb-index

 # When doing -Dgallium-xa=enabled we got:
 # meson.build:679:3: ERROR: Feature gallium-xa cannot be enabled: XA state tracker requires at least one of the following gallium drivers: nouveau, freedreno, i915, svga.


 # At the moment it is not possible to install valgrind i386 and amd64 at the
 # same time in Debian, as it is using monolithic package.
 # See https://bugs.debian.org/941160 for details
 MESA_COMMON_OPTS_64 = ["-Dvalgrind=enabled"]
 MESA_COMMON_OPTS_32 = ["-Dvalgrind=disabled"]

 # libdrm also supports valigrind, so also disable it on 32-bit. But support
 # of this flag might be removed in the future due to issues:
 # https://gitlab.freedesktop.org/mesa/drm/-/issues/63
 # Also the value names are different.
 LIBDRM_COMMON_OPTS_64 = ["-Dvalgrind=enabled"]
 LIBDRM_COMMON_OPTS_32 = ["-Dvalgrind=disabled"]

 if args.buildopencl:
    # Compile Clover/OpenCL only for 64-bit. 32-bit would require installing
    # "libclang1-{LLVMVERSION}:i386", but it removes the
    # "libclang1-{LLVMVERSION}:amd64" and header files!
    # See https://bugs.debian.org/941755 for details.

    MESA_COMMON_OPTS_64 += ["-Dgallium-opencl=icd"]

    # Also see https://bugs.debian.org/1023780 about multi-arch issues with spirv-tool

    # This option got removed in https://gitlab.freedesktop.org/mesa/mesa/-/commit/80c4ffb61a91ed252d45e38a96e893cec0771940
    # https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/27783
    # Looks like Clover is being slowly removed from Mesa.
    # Use Rusticl when possible.
    # MESA_COMMON_OPTS_64 += ["-Dopencl-spirv=true"]
    # MESA_COMMON_OPTS_32 += ["-Dopencl-spirv=false"]

    MESA_COMMON_OPTS_64 += ["-Dgallium-rusticl=true"]
    # Building rusticl for i386, requires cross-compiler, but rustc in Debian is
    # not multi-arch. Solution is to uninstall rustc and install rustup, then
    # manually install rustc. But this still causes issues due to spirv-tools
    # and llvm multi-arch problems.
    #
    # For most practical purposes, 64-bit OpenCL should be enough for most
    # people.
    # MESA_COMMON_OPTS_32 += ["-Dgallium-rusticl=true"]

 # Common opts for 32-bit and 64-bit, for libdrm and Mesa.
 # Ones with _OPT suffix are for optimized build, ones with _DBG suffix are for debug build.

 COMMON_OPTS_OPT = ["--buildtype=plain"]
 COMMON_OPTS_OPT += ["-Db_ndebug=true"]
 # If you really care about library size and maybe improve performance by 0.1%,
 # enable stripping. We already are compiling with -g0, so stripping will save
 # very little, and make stack traces or use in gdb / valgrind way harder.
 # COMMON_OPTS_OPT+=("--strip")
 #
 # We explicitly pass -mfpmath=sse, otherwise when compiling 32-bit version,
 # it will use x87 / non-see for almost everything, which is slower, and
 # can't be vectorized, even when using -march=native -msse2, etc.
 # With -mfpmath=sse, it will use sse and sse2 almost everywhere, modulo
 # few places where the calling conventions (i.e. to glibc) requires passing
 # stuff on x87 stack / registers.
 COMPILERFLAGS_OPT = "-pipe -march=native -O2 -mfpmath=sse"
 if args.heavyopt:
    nproc = capture(["nproc", "--ignore=2"]).strip()
    COMPILERFLAGS_OPT = f"-pipe -march=native -O3 -mfpmath=sse -ftree-vectorize -flto -flto={nproc} -g0 -fno-semantic-interposition"
 COMMON_OPTS_OPT += [
    f"-Dc_args={COMPILERFLAGS_OPT}",
    f"-Dcpp_args=-std=c++17 {COMPILERFLAGS_OPT}",
 ]

 # For i387, one can also use -mpc64, to set the 387 in "reduced precision" mode (32 or 64 bit).
 # It could be faster than full 80-bit, but that is anecdotal.

 COMMON_OPTS_DBG = ["--buildtype=debug"]
 COMMON_OPTS_DBG += ["-Db_ndebug=false"]
 #COMMON_OPTS_DBG += ["-Db_sanitize=thread"]
 COMPILERFLAGS_DBG = "-pipe -march=native -O1 -mfpmath=sse -ggdb -g3 -gz"
 # Note: This is working when doing 'meson configure', but I am not 100% sure
 # this is correct when passing everything just to initial 'meson'.
 # From testing it appears to be working.
 COMMON_OPTS_DBG += [
    f"-Dc_args={COMPILERFLAGS_DBG}",
    f"-Dcpp_args=-std=c++17 {COMPILERFLAGS_DBG}",
 ]

 # "-Db_sanitize=thread"


 # Build tests.
 # MESA_COMMON_OPTS += ["-Dbuild-tests=true"]


 # -Ddri-drivers=r100,r200,swrast # Note that dri swrast, is different than gallium
 # swrast. It is older rasterizer. the softpipe, llvmpipe are newer ones.


 # TODO(baryluk): Add option to build with clang, and with thread / address
 # sanitizers.

 # Even if we do not build 32-bit version, prepare the cross-file anyway.
 # This simplifies a bit of scripting.

 # Also by BUILDDBG we could theoretically build optimized libdrm, and
 # debug mesa, but that is kind of pointless, often you want debug in drm
 # too, and it will perform well anyway one way or another.

 if not os.path.exists(f"{SOURCEDIR_MESA}/llvm.ini") or not args.incremental:
    with open(f"{SOURCEDIR_MESA}/llvm.ini", "w") as f:
        print(f"""
 [binaries]
 c = '/usr/bin/x86_64-linux-gnu-gcc-{GCCVERSION}'
 cpp = '/usr/bin/x86_64-linux-gnu-g++-{GCCVERSION}'
 llvm-config = '/usr/bin/llvm-config-{LLVMVERSION}'
 strip = '/usr/bin/x86_64-linux-gnu-strip'
 """, file=f)


 if not os.path.exists(f"{SOURCEDIR_MESA}/meson-cross-i386.ini") or not args.incremental:
    with open(f"{SOURCEDIR_MESA}/meson-cross-i386.ini", "w") as f:
        print(f"""
 [binaries]
 c = '/usr/bin/i686-linux-gnu-gcc-{GCCVERSION}'
 cpp = '/usr/bin/i686-linux-gnu-g++-{GCCVERSION}'
 ar = '/usr/bin/i686-linux-gnu-gcc-ar-{GCCVERSION}'
 strip = '/usr/bin/i686-linux-gnu-strip'
 pkg-config = '/usr/bin/i686-linux-gnu-pkg-config'
 ; We are cheating here. We are using 64-bit llvm-config. But we stars align
 ; it should work (same compiler and linker flags will be used).
 llvm-config = '/usr/bin/llvm-config-{LLVMVERSION}'
 ; llvm-config = '/usr/lib/llvm-{LLVMVERSION}/bin/llvm-config'

 rust_ld = '/usr/bin/i686-linux-gnu-gcc-{GCCVERSION}'
 rust = ['rustc', '--target', 'i686-unknown-linux-gnu']
 ; -C linker=gcc -C link-arg=-m32

 ; set BINDGEN_EXTRA_CLANG_ARGS to either --target=i686-unknown-linux-gnu or -target i686-unknown-linux-gnu

 [built-in options]
 c_args = ['-m32']
 c_link_args = ['-m32']
 cpp_args = ['-m32']
 cpp_link_args = ['-m32']

 [host_machine]
 system = 'linux'
 cpu_family = 'x86'
 cpu = 'i686'
 endian = 'little'
 """, file=f)

 # opt / dbg, amd64 / i386
 def common_build(BUILD_TYPE: str, ARCHITECTURE: str):
    maybeprint()
    if USE_SYSTEM_LIBDRM:
        print(f"Configuring and building {ARCHITECTURE} {BUILD_TYPE} libdrm and Mesa ...")
    else:
        print(f"Configuring and building {ARCHITECTURE} {BUILD_TYPE} Mesa ...")
    maybeprint()

    if BUILD_TYPE == "opt":
        COMMON_OPTS_BUILD_TYPE_SPECIFIC = COMMON_OPTS_OPT
    elif BUILD_TYPE == "dbg":
        COMMON_OPTS_BUILD_TYPE_SPECIFIC = COMMON_OPTS_DBG
    else:
        raise Exception(f"Unknown BUILD_TYPE passed to common_build: {BUILD_TYPE}")


    if ARCHITECTURE == "amd64":
        CC = f"gcc-{GCCVERSION}"
        CXX = f"g++-{GCCVERSION}"
        PKG_CONFIG_ARCH = "x86_64"
        # We use the same cross file for libdrm and mesa. But we keep it in Mesa directory only for convinience.
        CROSS_FILE = f"{SOURCEDIR_MESA}/llvm.ini"
        COMMON_OPTS_ARCH_SPECIFIC = COMMON_OPTS_64
        MESA_COMMON_OPTS_ARCH_SPECIFIC = MESA_COMMON_OPTS_64
        LIBDRM_COMMON_OPTS_ARCH_SPECIFIC = LIBDRM_COMMON_OPTS_64
    elif ARCHITECTURE == "i386":
        CC = f"i686-linux-gnu-gcc-{GCCVERSION}"
        CXX = f"i686-linux-gnu-g++-{GCCVERSION}"
        PKG_CONFIG_ARCH = "i686"
        CROSS_FILE = f"{SOURCEDIR_MESA}/meson-cross-i386.ini"  # ditto.
        COMMON_OPTS_ARCH_SPECIFIC = COMMON_OPTS_32
        MESA_COMMON_OPTS_ARCH_SPECIFIC = MESA_COMMON_OPTS_32
        LIBDRM_COMMON_OPTS_ARCH_SPECIFIC = LIBDRM_COMMON_OPTS_32
    else:
        raise Exception(f"Unknown ARCHITECTURE passed to common_build: {ARCHITECTURE}")

    # So happens that libdrm and mesa both use meson and ninja, and we should be
    # able to use same options and techiniques for both.

    # We just separate the some mesa-specific meson options into MESA_COMMON_OPTS
    # now.

    # We set same --prefix for both libdrm and mesa, that makes it easier later
    # to use pkgconfig, and setup LD_LIBRARY_PATH in general.

    PREFIX = f"{INSTALLDIR}/build-{ARCHITECTURE}-{BUILD_TYPE}/install"
    assert not PREFIX.endswith("/")

    env2 = dict(os.environ)
    env2["CC"] = CC
    env2["CXX"] = CXX
    env2["PKG_CONFIG"] = f"{PKG_CONFIG_ARCH}-linux-gnu-pkg-config"

    if not USE_SYSTEM_LIBDRM:
        maybeprint()
        print(f"libdrm: Configuring and building {ARCHITECTURE} {BUILD_TYPE} build ...")
        maybeprint()

        os.chdir(SOURCEDIR_LIBDRM)

        BUILDDIR_LIBDRM = f"{BUILDDIR}/build-{ARCHITECTURE}-{BUILD_TYPE}/libdrm"

        # At the moment we do not have LIBDRM_COMMON_OPTS (i.e. to select libdrm features or drivers to build).
        # libdrm even with everything enabled build so fast, that there is really no point to exclude things (like vmwgfx API or Nouveau API).

        if not os.path.exists(f"{BUILDDIR_LIBDRM}/build.ninja") or not args.incremental:
            run([*NICE,
                 "meson", "setup", f"{BUILDDIR_LIBDRM}/",
                 f"--prefix={PREFIX}",
                 f"--cross-file={CROSS_FILE}",
                 "-Dtests=false",
                 *COMMON_OPTS,
                 *COMMON_OPTS_ARCH_SPECIFIC,
                 *COMMON_OPTS_BUILD_TYPE_SPECIFIC,
                 *LIBDRM_COMMON_OPTS_ARCH_SPECIFIC], env=env2)

        # run(NICE + ["meson", "configure", f"{BUILDDIR_LIBDRM}/"] + COMMON_OPTS + COMMON_OPTS_ARCH_SPECIFIC + COMMON_OPTS_BUILD_TYPE_SPECIFIC + LIBDRM_COMMON_OPTS_ARCH_SPECIFIC])
        run(NICE + ["ninja", "--quiet", "-C", f"{BUILDDIR_LIBDRM}/"])
        print(f"libdrm: Installing {ARCHITECTURE} {BUILD_TYPE} build ...")
        run(NICE + ["ninja", "--quiet", "-C", f"{BUILDDIR_LIBDRM}/", "install"])

        # Now libdrm is installed, we need to tell PKG_CONFIG to also look for the
        # extra .pc files in the installed directory.

        # Note: This only prepends extra paths. Default paths will still be searched after it.
        # We do not use 'export' and pass it as env variable to meson instead
        # (probably not needed to pass it to ninja).
        PKG_CONFIG_PATH = f"{PREFIX}/lib/pkgconfig"
    else:
        PKG_CONFIG_PATH = None


    maybeprint()
    print(f"mesa: Configuring and building {ARCHITECTURE} {BUILD_TYPE} build ...")
    maybeprint()

    os.chdir(SOURCEDIR_MESA)

    BUILDDIR_MESA = f"{BUILDDIR}/build-{ARCHITECTURE}-{BUILD_TYPE}/mesa"

    # if ARCHITECTURE == "i386":
    #     PKG_CONFIG_PATH = f"/usr/lib/i386-linux-gnu/pkgconfig:{PKG_CONFIG_PATH}" if PKG_CONFIG_PATH else "/usr/lib/i386-linux-gnu/pkgconfig"

    if PKG_CONFIG_PATH is not None:
        env2["PKG_CONFIG_PATH"] = PKG_CONFIG_PATH


    if not os.path.exists(f"{BUILDDIR_MESA}/build.ninja") or not args.incremental:
        run([*NICE,
             "meson", "setup", f"{BUILDDIR_MESA}/",
             f"--prefix={PREFIX}",
             f"--cross-file={CROSS_FILE}",
             *COMMON_OPTS,
             *MESA_COMMON_OPTS,
             *COMMON_OPTS_ARCH_SPECIFIC,
             *COMMON_OPTS_BUILD_TYPE_SPECIFIC,
             *MESA_COMMON_OPTS_ARCH_SPECIFIC], env=env2)

    # run(NICE + ["meson", "configure", f"{BUILDDIR_MESA}/", *COMMON_OPTS, *MESA_COMMON_OPTS, *COMMON_OPTS_ARCH_SPECIFIC, *COMMON_OPTS_BUILD_TYPE_SPECIFIC, *MESA_COMMON_OPTS_ARCH_SPECIFIC])
    run(NICE + ["ninja", "--quiet", "-C", f"{BUILDDIR_MESA}/"])
    print(f"mesa: Installing {ARCHITECTURE} {BUILD_TYPE} build ...")
    run(NICE + ["ninja", "--quiet", "-C", f"{BUILDDIR_MESA}/", "install"])


 if args.build64:
    if args.buildopt:
        common_build("opt", "amd64")

    if args.builddebug:
        common_build("dbg", "amd64")

 if args.build32:
    # ar is symlink to x86_64-linux-gnu-ar
    # gcc-ar is symlink to gcc-ar-10, and it is symlink to x86_64-linux-gnu-gcc-ar-10
    if args.buildopt:
        common_build("opt", "i386")

    if args.builddebug:
        common_build("dbg", "i386")

 maybeprint()
 print("Generating source files with environmental variable overrides ...")
 maybeprint()

 def chmodx(filename):
    os.chmod(filename, mode=0o755)  # -rwxr-xr-x


 def generate_wrapper_files(BUILD_TYPE: str) -> None:
    assert BUILD_TYPE in {"opt", "dbg"}

    LD_LIBRARY_PATH = []
    LIBGL_DRIVERS_PATH = []
    VK_LAYER_PATH = []
    VK_ICD_FILENAMES = []
    OCL_ICD_VENDORS = []
    LIBVA_DRIVERS_PATH = []
    PATH_EXTRA = []
    if args.build64:
        LD_LIBRARY_PATH.append(f"{INSTALLDIR}/build-amd64-{BUILD_TYPE}/install/lib")
        LD_LIBRARY_PATH.append(f"{INSTALLDIR}/build-amd64-{BUILD_TYPE}/install/lib/vdpau")
        LIBGL_DRIVERS_PATH.append(f"{INSTALLDIR}/build-amd64-{BUILD_TYPE}/install/lib/dri")
        VK_LAYER_PATH.append(f"{INSTALLDIR}/build-amd64-{BUILD_TYPE}/install/share/vulkan/explicit_layer.d")
        VK_ICD_FILENAMES.append(f"{INSTALLDIR}/build-amd64-{BUILD_TYPE}/install/share/vulkan/icd.d/radeon_icd.x86_64.json")
        VK_ICD_FILENAMES.append(f"{INSTALLDIR}/build-amd64-{BUILD_TYPE}/install/share/vulkan/icd.d/lvp_icd.x86_64.json")
        OCL_ICD_VENDORS.append(f"{INSTALLDIR}/build-amd64-{BUILD_TYPE}/install/etc/OpenCL/vendors/mesa.icd")
        LIBVA_DRIVERS_PATH.append(f"{INSTALLDIR}/build-amd64-{BUILD_TYPE}/install/lib/dri")
        PATH_EXTRA.append(f"{INSTALLDIR}/build-amd64-{BUILD_TYPE}/install/bin")
    if args.build32:
        LD_LIBRARY_PATH.append(f"{INSTALLDIR}/build-i386-{BUILD_TYPE}/install/lib")
        LD_LIBRARY_PATH.append(f"{INSTALLDIR}/build-i386-{BUILD_TYPE}/install/lib/vdpau")
        LIBGL_DRIVERS_PATH.append(f"{INSTALLDIR}/build-i386-{BUILD_TYPE}/install/lib/dri")
        VK_LAYER_PATH.append(f"{INSTALLDIR}/build-i386-{BUILD_TYPE}/install/share/vulkan/explicit_layer.d")
        VK_ICD_FILENAMES.append(f"{INSTALLDIR}/build-i386-{BUILD_TYPE}/install/share/vulkan/icd.d/radeon_icd.i686.json")
        VK_ICD_FILENAMES.append(f"{INSTALLDIR}/build-i386-{BUILD_TYPE}/install/share/vulkan/icd.d/lvp_icd.i686.json")
        OCL_ICD_VENDORS.append(f"{INSTALLDIR}/build-i386-{BUILD_TYPE}/install/etc/OpenCL/vendors/mesa.icd")
        LIBVA_DRIVERS_PATH.append(f"{INSTALLDIR}/build-i386-{BUILD_TYPE}/install/lib/dri")
        PATH_EXTRA.append(f"{INSTALLDIR}/build-i386-{BUILD_TYPE}/install/bin")

    with open(f"{HOME}/enable-new-mesa-{BUILD_TYPE}.source", "w") as f:
        print(f"""#!/bin/sh

 # Do not execute this file in your shell, instead "source" it using:
 #   . ~/enable-new-mesa-{BUILD_TYPE}.source
 # or
 #   source ~/enable-new-mesa-{BUILD_TYPE}.source
 #
 # This will have effects only once in the current shell. It will not apply to
 # other shells, terminals, users, whole desktop, other running programs, or once
 # you close this shell, logout, reboot, etc. It is temporary.
 #
 # If you want you get remove eventually. It will be regenerated every time you
 # run "mesa-build.sh" script to build new Mesa.

 echo "Warning: Will remove existing LD_LIBRARY_PATH." >&2
 export LD_LIBRARY_PATH="{':'.join(LD_LIBRARY_PATH)}"
 export LIBGL_DRIVERS_PATH="{':'.join(LIBGL_DRIVERS_PATH)}"
 export VK_LAYER_PATH="{':'.join(VK_LAYER_PATH)}:/usr/share/vulkan/explicit_layer.d"
 export VK_ICD_FILENAMES="{':'.join(VK_ICD_FILENAMES)}"
 export OCL_ICD_VENDORS="{':'.join(OCL_ICD_VENDORS)}"
 export LIBVA_DRIVERS_PATH="{':'.join(LIBVA_DRIVERS_PATH)}"
 export PATH="{':'.join(PATH_EXTRA)}:${{PATH}}"

 export VK_INSTANCE_LAYERS=VK_LAYER_MESA_overlay
 # To enable frametime outputs uncommend next line. It requires modified Mesa.
 #export VK_LAYER_MESA_OVERLAY_CONFIG=output_relative_time,fps,frame,frame_timing,gpu_timing,pipeline_graphics,graph_y_zero,output_csv=0,output_per_frame=1,output_flush=0,position=top-right,width=300,output_file=/tmp/mesa_overlay_%T_%p.txt
 # This uses some extra modified features, but they will only produce warnings in
 # normal Mesa.
 # export VK_LAYER_MESA_OVERLAY_CONFIG=output_relative_time,fps,frame,frame_timing,gpu_timing,pipeline_graphics,graph_y_zero,output_csv=0,output_per_frame=1,output_flush=0,position=top-right,width=300
 export VK_LAYER_MESA_OVERLAY_CONFIG=fps,frame,frame_timing,gpu_timing,pipeline_graphics,position=top-right,width=300

 export GALLIUM_HUD=fps
 export DXVK_HUD=full

 # If one wishes to use exported dev files, one can use /home/user/mesa/build-i386/install/lib/pkgconfig
 # And possible /home/user/mesa/build-i386/install/include , for some state trackers, vulkan_intel.h,
 # GL, GLEX, KHR headers.

 # Enable NV_mesh_shader
 export RADV_PERFTEST=nv_ms
 """, end="", file=f)

    with open(f"{HOME}/mesa-{BUILD_TYPE}", "w") as f:
        print(f"""#!/bin/sh

 # We keep the existing LD_LIBRARY_PATH and VK_LAYER_PATH, and not erase it unconditionally.
 # This is beacuse user might have other libs and layers installed, and want to use them.
 # Also, a steam often will provide its own very verbose LD_LIBRARY_PATH to own runtime libraries,
 # and they might be required for games to work properly.

 export LD_LIBRARY_PATH="{':'.join(LD_LIBRARY_PATH)}:${{LD_LIBRARY_PATH}}"
 export LIBGL_DRIVERS_PATH="{':'.join(LIBGL_DRIVERS_PATH)}"
 export VK_LAYER_PATH="{':'.join(VK_LAYER_PATH)}:/usr/share/vulkan/explicit_layer.d:${{VK_LAYER_PATH}}"
 export VK_ICD_FILENAMES="{':'.join(VK_ICD_FILENAMES)}"
 export OCL_ICD_VENDORS="{':'.join(OCL_ICD_VENDORS)}"
 export LIBVA_DRIVERS_PATH="{':'.join(LIBVA_DRIVERS_PATH)}"
 export PATH="{':'.join(PATH_EXTRA)}:${{PATH}}"

 # Enable NV_mesh_shader
 export RADV_PERFTEST=nv_ms

 # TODO(baryluk): If the path has no "/", maybe use 'env'?

 #if which gamemoderun >/dev/null; then
 #  exec env gamemoderun "$@"
 #else
 exec env "$@"
 #fi
 """, end="", file=f)

    chmodx(f"{HOME}/mesa-{BUILD_TYPE}")

    # A handy wrapper to run with zink.
    with open(f"{HOME}/zink-{BUILD_TYPE}", "w") as f:
        print(f"""#!/bin/sh

 exec env MESA_LOADER_DRIVER_OVERRIDE=zink "${{HOME}}/mesa-{BUILD_TYPE}" "$@"
 """, end="", file=f)

    chmodx(f"{HOME}/zink-{BUILD_TYPE}")

 if args.buildopt:
    generate_wrapper_files("opt")


 if args.builddebug:
    generate_wrapper_files("dbg")


 with open(f"{HOME}/disable-new-mesa-hud.source", "w") as f:
    print("""#!/bin/sh

 unset DXVK_HUD
 unset GALLIUM_HUD
 unset VK_LAYER_MESA_OVERLAY_CONFIG
 unset VK_INSTANCE_LAYERS
 """, end="", file=f)


 if "DISPLAY" in os.environ:
    maybeprint()
    print("Testing installation ...")
    maybeprint()

    if args.buildopt:
        runner = f"{HOME}/mesa-opt"
    else:
        assert args.buildebug
        runner = f"{HOME}/mesa-dbg"

    test_env = dict(os.environ)

    glxinfo = capture([runner, "glxinfo"], env=test_env)

    if not glxinfo:
        maybeprint()
        print("glxinfo failed! Bad installation of DRI, gallium or other component.", file=sys.stderr)
        maybeprint()
        # See https://gitlab.freedesktop.org/mesa/mesa/-/issues/4236 and https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96817#c17 for details.
        # sys.exit(2)

    print("\n".join(grep(glxinfo, "OpenGL renderer string")))
    if "OpenGL renderer string" not in glxinfo:
        raise Exception("glxinfo failed")

    vulkaninfo = capture([runner, "vulkaninfo"], env=test_env)
    print("\n".join(grep(vulkaninfo, "GPU id")))

    # test_env["RADV_DEBUG"] = "llvm"
    # vulkaninfo_llvm = capture([runner, "vulkaninfo"], env=test_env)
    # print("\n".join(grep(vulkaninfo_llvm, "GPU id")))

    test_env.update({"VK_INSTANCE_LAYERS": "VK_LAYER_MESA_overlay"})
    if not run([runner, "vkcube", "--c", "60"], env=test_env):
        maybeprint()
        print("vkcube failed! Bad installation of vulkan drivers or Mesa overlay layer.", file=sys.stderr)
        maybeprint()
        # sys.exit(2)

    # export VK_INSTANCE_LAYERS=VK_LAYER_KHRONOS_validation
 else:
    maybeprint()
    print("Skipping testing because we are running headless (no X server running?)")
    maybeprint()

 # Testing SSE, AVX support:

 # $ objdump -d "${INSTALLDIR}/install-amd64-opt/install/lib/libvulkan_radeon.so" | grep %ymm | wc -l
 # 12225
 # $ objdump -d "${INSTALLDIR}/install-amd64-opt/install/lib/libvulkan_radeon.so" | grep %xmm | wc -l
 # 41859
 # $ objdump -d "${INSTALLDIR}/install-amd64-opt/install/lib/libvulkan_radeon.so" | grep %ymm | grep %xmm | wc -l
 # 966
 # $ 
 # Good.

 # $ objdump -d "${INSTALLDIR}/install-i386-opt/install/lib/libvulkan_radeon.so" | grep %xmm | wc -l
 # 0
 # $ 
 # BAD.


 #cd $HOME && git clone git://anongit.freedesktop.org/mesa/rbug-gui rbug-gui
 #sudo([*APT_INSTALL, "libgtkgl2.0-dev", "libgtkglext1-dev"])

 #sudo(["apt-get", "clean"])

 print()
 print("Build complete and passed basic tests!")
 print("Execute one of the following shell commands to enable proper Mesa")
 print("library paths and variables in the current shell:")
 if args.buildopt:
    maybeprint()
    print(f". \"{HOME}/enable-new-mesa-opt.source\"  # Optimized Mesa build")
 if args.builddebug:
    maybeprint()
    print(f". \"{HOME}/enable-new-mesa-dbg.source\"  # Debug Mesa build")
 print()

 maybeprint()
 print("To disable GALLIUM_HUD , DXVK_HUD and MESA_OVERLAY execute (AFTER above):")
 print(f". \"{HOME}/disable-new-mesa-hud.source\"")
 print()
 maybeprint()

 print("Alternative run your application with one of these wrapper scripts:")
 maybeprint()
 if args.buildopt:
    print(f"{HOME}/mesa-opt")
    print(f"{HOME}/zink-opt")
    maybeprint()
 if args.builddebug:
    print(f"{HOME}/mesa-dbg")
    print(f"{HOME}/zink-dbg")
    maybeprint()

 maybeprint()
 print("All generated scripts use absolute paths, so you can move / relocate them")
 print("as you wish (i.e. into your PATH, like ~/bin, or ~/.local/bin). Or safely remove.")
 maybeprint()

 maybeprint()
 maybeprint("Bye!")