# Copyright © 2017-2019 Intel Corporation

# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:

# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.

# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.

project(
  'mesa',
  ['c', 'cpp'],
  version : run_command(
    [find_program('python', 'python2', 'python3'), 'bin/meson_get_version.py']
  ).stdout(),
  license : 'MIT',
  meson_version : '>= 0.45',
  default_options : ['buildtype=debugoptimized', 'b_ndebug=if-release', 'c_std=c99', 'cpp_std=c++11']
)

cc = meson.get_compiler('c')
cpp = meson.get_compiler('cpp')

null_dep = dependency('', required : false)

# Arguments for the preprocessor, put these in a separate array from the C and
# C++ (cpp in meson terminology) arguments since they need to be added to the
# default arguments for both C and C++.
pre_args = [
  '-D__STDC_CONSTANT_MACROS',
  '-D__STDC_FORMAT_MACROS',
  '-D__STDC_LIMIT_MACROS',
  '-DPACKAGE_VERSION="@0@"'.format(meson.project_version()),
  '-DPACKAGE_BUGREPORT="https://bugs.freedesktop.org/enter_bug.cgi?product=Mesa"',
]

with_vulkan_icd_dir = get_option('vulkan-icd-dir')
with_tests = get_option('build-tests')
with_valgrind = get_option('valgrind')
with_libunwind = get_option('libunwind')
with_asm = get_option('asm')
with_glx_read_only_text = get_option('glx-read-only-text')
with_glx_direct = get_option('glx-direct')
with_osmesa = get_option('osmesa')
with_swr_arches = get_option('swr-arches')
with_tools = get_option('tools')
if with_tools.contains('all')
  with_tools = ['etnaviv', 'freedreno', 'glsl', 'intel', 'nir', 'nouveau', 'xvmc']
endif

dri_drivers_path = get_option('dri-drivers-path')
if dri_drivers_path == ''
  dri_drivers_path = join_paths(get_option('prefix'), get_option('libdir'), 'dri')
endif
dri_search_path = get_option('dri-search-path')
if dri_search_path == ''
  dri_search_path = dri_drivers_path
endif

with_gles1 = get_option('gles1')
with_gles2 = get_option('gles2')
if host_machine.system() == 'windows'
  if with_gles1 == 'auto'
    with_gles1 = 'false'
  endif
  if with_gles2 == 'auto'
    with_gles2 = 'false'
  endif
endif
with_opengl = get_option('opengl')
with_shared_glapi = get_option('shared-glapi')

# shared-glapi is required if at least two OpenGL APIs are being built
if not with_shared_glapi
  if ((with_gles1 == 'true' and with_gles2 == 'true') or 
      (with_gles1 == 'true' and with_opengl) or
      (with_gles2 == 'true' and with_opengl))
    error('shared-glapi required for building two or more of OpenGL, OpenGL ES 1.x, OpenGL ES 2.x')
  endif
  with_gles1 = 'false'
  with_gles2 = 'false'
endif

# We require OpenGL for OpenGL ES
if not with_opengl
  if (with_gles1 == 'true' or with_gles2 == 'true') and not with_opengl
    error('building OpenGL ES without OpenGL is not supported.')
  endif
  with_gles1 = 'false'
  with_gles2 = 'false'
endif

with_gles1 = with_gles1 != 'false'
with_gles2 = with_gles2 != 'false'
with_any_opengl = with_opengl or with_gles1 or with_gles2
# Only build shared_glapi if at least one OpenGL API is enabled
with_shared_glapi = get_option('shared-glapi') and with_any_opengl

system_has_kms_drm = ['openbsd', 'netbsd', 'freebsd', 'dragonfly', 'linux'].contains(host_machine.system())

dri_drivers = get_option('dri-drivers')
if dri_drivers.contains('auto')
  if system_has_kms_drm
    # TODO: PPC, Sparc
    if ['x86', 'x86_64'].contains(host_machine.cpu_family())
      dri_drivers = ['i915', 'i965', 'r100', 'r200', 'nouveau']
    elif ['arm', 'aarch64'].contains(host_machine.cpu_family())
      dri_drivers = []
    else
      error('Unknown architecture @0@. Please pass -Ddri-drivers to set driver options. Patches gladly accepted to fix this.'.format(
            host_machine.cpu_family()))
    endif
  elif ['darwin', 'windows', 'cygwin', 'haiku'].contains(host_machine.system())
    # only swrast would make sense here, but gallium swrast is a much better default
    dri_drivers = []
  else
    error('Unknown OS @0@. Please pass -Ddri-drivers to set driver options. Patches gladly accepted to fix this.'.format(
          host_machine.system()))
  endif
endif

with_dri_i915 = dri_drivers.contains('i915')
with_dri_i965 = dri_drivers.contains('i965')
with_dri_r100 = dri_drivers.contains('r100')
with_dri_r200 = dri_drivers.contains('r200')
with_dri_nouveau = dri_drivers.contains('nouveau')
with_dri_swrast = dri_drivers.contains('swrast')

with_dri = dri_drivers.length() != 0 and dri_drivers != ['']

gallium_drivers = get_option('gallium-drivers')
if gallium_drivers.contains('auto')
  if system_has_kms_drm
    # TODO: PPC, Sparc
    if ['x86', 'x86_64'].contains(host_machine.cpu_family())
      gallium_drivers = [
        'r300', 'r600', 'radeonsi', 'nouveau', 'virgl', 'svga', 'swrast'
      ]
    elif ['arm', 'aarch64'].contains(host_machine.cpu_family())
      gallium_drivers = [
        'kmsro', 'v3d', 'vc4', 'freedreno', 'etnaviv', 'nouveau',
        'tegra', 'virgl', 'lima', 'swrast'
      ]
    else
      error('Unknown architecture @0@. Please pass -Dgallium-drivers to set driver options. Patches gladly accepted to fix this.'.format(
            host_machine.cpu_family()))
    endif
  elif ['darwin', 'windows', 'cygwin', 'haiku'].contains(host_machine.system())
    gallium_drivers = ['swrast']
  else
    error('Unknown OS @0@. Please pass -Dgallium-drivers to set driver options. Patches gladly accepted to fix this.'.format(
          host_machine.system()))
  endif
endif
with_gallium_kmsro = gallium_drivers.contains('kmsro')
with_gallium_radeonsi = gallium_drivers.contains('radeonsi')
with_gallium_r300 = gallium_drivers.contains('r300')
with_gallium_r600 = gallium_drivers.contains('r600')
with_gallium_nouveau = gallium_drivers.contains('nouveau')
with_gallium_freedreno = gallium_drivers.contains('freedreno')
with_gallium_softpipe = gallium_drivers.contains('swrast')
with_gallium_vc4 = gallium_drivers.contains('vc4')
with_gallium_v3d = gallium_drivers.contains('v3d')
with_gallium_panfrost = gallium_drivers.contains('panfrost')
with_gallium_etnaviv = gallium_drivers.contains('etnaviv')
with_gallium_tegra = gallium_drivers.contains('tegra')
with_gallium_iris = gallium_drivers.contains('iris')
with_gallium_i915 = gallium_drivers.contains('i915')
with_gallium_svga = gallium_drivers.contains('svga')
with_gallium_virgl = gallium_drivers.contains('virgl')
with_gallium_swr = gallium_drivers.contains('swr')
with_gallium_lima = gallium_drivers.contains('lima')

if cc.get_id() == 'intel'
  if meson.version().version_compare('< 0.49.0')
    error('Meson does not have sufficient support of ICC before 0.49.0 to compile mesa')
  elif with_gallium_swr and meson.version().version_compare('== 0.49.0')
    warning('Meson as of 0.49.0 is sufficient for compiling mesa with ICC, but there are some caveats with SWR. 0.49.1 should resolve all of these')
  endif
endif

with_gallium = gallium_drivers.length() != 0 and gallium_drivers != ['']

if with_gallium and system_has_kms_drm
  _glx = get_option('glx')
  _egl = get_option('egl')
  if _glx == 'dri' or _egl == 'true' or (_glx == 'disabled' and _egl != 'false')
    with_dri = true
  endif
endif

_vulkan_drivers = get_option('vulkan-drivers')
if _vulkan_drivers.contains('auto')
  if system_has_kms_drm
    if host_machine.cpu_family().startswith('x86')
      _vulkan_drivers = ['amd', 'intel']
    elif ['arm', 'aarch64'].contains(host_machine.cpu_family())
      _vulkan_drivers = []
    else
      error('Unknown architecture @0@. Please pass -Dvulkan-drivers to set driver options. Patches gladly accepted to fix this.'.format(
            host_machine.cpu_family()))
    endif
  elif ['darwin', 'windows', 'cygwin', 'haiku'].contains(host_machine.system())
    # No vulkan driver supports windows or macOS currently
    _vulkan_drivers = []
  else
    error('Unknown OS @0@. Please pass -Dvulkan-drivers to set driver options. Patches gladly accepted to fix this.'.format(
          host_machine.system()))
  endif
endif

with_intel_vk = _vulkan_drivers.contains('intel')
with_amd_vk = _vulkan_drivers.contains('amd')
with_freedreno_vk = _vulkan_drivers.contains('freedreno')
with_any_vk = _vulkan_drivers.length() != 0 and _vulkan_drivers != ['']

if with_freedreno_vk and get_option('I-love-half-baked-turnips') != true
  error('Cannot enable freedreno vulkan driver')
endif

if with_dri_swrast and (with_gallium_softpipe or with_gallium_swr)
  error('Only one swrast provider can be built')
endif
if with_dri_i915 and with_gallium_i915
  error('Only one i915 provider can be built')
endif
if with_gallium_kmsro and not (with_gallium_v3d or with_gallium_vc4 or with_gallium_etnaviv or with_gallium_freedreno or with_gallium_panfrost or with_gallium_lima)
  error('kmsro driver requires one or more renderonly drivers (vc4, etnaviv, freedreno, panfrost, lima)')
endif
if with_gallium_tegra and not with_gallium_nouveau
  error('tegra driver requires nouveau driver')
endif

if host_machine.system() == 'darwin'
  with_dri_platform = 'apple'
elif ['windows', 'cygwin'].contains(host_machine.system())
  with_dri_platform = 'windows'
elif system_has_kms_drm
  with_dri_platform = 'drm'
else
  # FIXME: haiku doesn't use dri, and xlib doesn't use dri, probably should
  # assert here that one of those cases has been met.
  # FIXME: illumos ends up here as well
  with_dri_platform = 'none'
endif

_platforms = get_option('platforms')
if _platforms.contains('auto')
  if system_has_kms_drm
    _platforms = ['x11', 'wayland', 'drm', 'surfaceless']
  elif ['darwin', 'windows', 'cygwin'].contains(host_machine.system())
    _platforms = ['x11', 'surfaceless']
  elif ['haiku'].contains(host_machine.system())
    _platforms = ['haiku']
  else
    error('Unknown OS @0@. Please pass -Dplatforms to set platforms. Patches gladly accepted to fix this.'.format(
          host_machine.system()))
  endif
endif

with_platform_android = _platforms.contains('android')
with_platform_x11 = _platforms.contains('x11')
with_platform_wayland = _platforms.contains('wayland')
with_platform_drm = _platforms.contains('drm')
with_platform_haiku = _platforms.contains('haiku')
with_platform_surfaceless = _platforms.contains('surfaceless')

with_platforms = false
if _platforms.length() != 0 and _platforms != ['']
  # sanity check that list contains no empty strings
  if _platforms.contains('')
    error('Invalid argument list given to -Dplatforms, please fix.')
  endif
  with_platforms = true
  egl_native_platform = _platforms[0]
endif

_xlib_lease = get_option('xlib-lease')
if _xlib_lease == 'auto'
  with_xlib_lease = with_platform_x11 and with_platform_drm
else
  with_xlib_lease = _xlib_lease == 'true'
endif

with_glx = get_option('glx')
if with_glx == 'auto'
  if with_dri
    with_glx = 'dri'
  elif with_platform_haiku
    with_glx = 'disabled'
  elif with_gallium
    # Even when building just gallium drivers the user probably wants dri
    with_glx = 'dri'
  elif with_platform_x11 and with_any_opengl and not with_any_vk
    # The automatic behavior should not be to turn on xlib based glx when
    # building only vulkan drivers
    with_glx = 'xlib'
  else
    with_glx = 'disabled'
  endif
endif
if with_glx == 'dri'
   if with_gallium
      with_dri = true
   endif
endif

if not (with_dri or with_gallium or with_glx == 'xlib' or with_glx == 'gallium-xlib')
  with_gles1 = false
  with_gles2 = false
  with_opengl = false
  with_any_opengl = false
  with_shared_glapi = false
endif

_gbm = get_option('gbm')
if _gbm == 'auto'
  with_gbm = system_has_kms_drm and with_dri
else
  with_gbm = _gbm == 'true'
endif
if with_gbm and not system_has_kms_drm
  error('GBM only supports DRM/KMS platforms')
endif

_egl = get_option('egl')
if _egl == 'auto'
  with_egl = (
    not ['darwin', 'windows'].contains(host_machine.system()) and
    with_dri and with_shared_glapi and with_platforms
  )
elif _egl == 'true'
  if not with_dri
    error('EGL requires dri')
  elif not with_shared_glapi
    error('EGL requires shared-glapi')
  elif not with_platforms
    error('No platforms specified, consider -Dplatforms=drm,x11,surfaceless at least')
  elif not ['disabled', 'dri'].contains(with_glx)
    error('EGL requires dri, but a GLX is being built without dri')
  elif ['darwin', 'windows'].contains(host_machine.system())
    error('EGL is not available on Windows or MacOS')
  endif
  with_egl = true
else
  with_egl = false
endif

if with_egl and not (with_platform_drm or with_platform_surfaceless or with_platform_android)
  if with_gallium_radeonsi
    error('RadeonSI requires the drm, surfaceless or android platform when using EGL')
  endif
  if with_gallium_virgl
    error('Virgl requires the drm, surfaceless or android platform when using EGL')
  endif
endif

pre_args += '-DGLX_USE_TLS'
if with_glx != 'disabled'
  if not (with_platform_x11 and with_any_opengl)
    error('Cannot build GLX support without X11 platform support and at least one OpenGL API')
  elif with_glx == 'gallium-xlib' 
    if not with_gallium
      error('Gallium-xlib based GLX requires at least one gallium driver')
    elif not with_gallium_softpipe
      error('Gallium-xlib based GLX requires softpipe or llvmpipe.')
    elif with_dri
      error('gallium-xlib conflicts with any dri driver')
    endif
  elif with_glx == 'xlib' 
    if with_dri
      error('xlib conflicts with any dri driver')
    endif
  elif with_glx == 'dri'
    if not with_dri
      error('dri based GLX requires at least one DRI driver')
    elif not with_shared_glapi
      error('dri based GLX requires shared-glapi')
    endif
  endif
endif

with_glvnd = get_option('glvnd')
if with_glvnd
  if with_glx == 'xlib' or with_glx == 'gallium-xlib'
    error('Cannot build glvnd support for GLX that is not DRI based.')
  elif with_glx == 'disabled' and not with_egl
    error('glvnd requires DRI based GLX and/or EGL')
  endif
  if get_option('egl-lib-suffix') != ''
    error('''EGL lib suffix can't be used with libglvnd''')
  endif
endif

if with_vulkan_icd_dir == ''
  with_vulkan_icd_dir = join_paths(get_option('datadir'), 'vulkan/icd.d')
endif

with_dri2 = (with_dri or with_any_vk) and (with_dri_platform == 'drm' or
  host_machine.system() == 'gnu')
_dri3 = get_option('dri3')
if _dri3 == 'auto'
  with_dri3 = system_has_kms_drm and with_dri2
else
  with_dri3 = _dri3 == 'true'
endif

if with_any_vk and (with_platform_x11 and not with_dri3)
  error('Vulkan drivers require dri3 for X11 support')
endif
if with_dri
  if with_glx == 'disabled' and not with_egl and not with_gbm and with_osmesa != 'classic'
    error('building dri drivers require at least one windowing system or classic osmesa')
  endif
endif

prog_pkgconfig = find_program('pkg-config')

_vdpau = get_option('gallium-vdpau')
if not system_has_kms_drm
  if _vdpau == 'true'
    error('VDPAU state tracker can only be build on unix-like OSes.')
  else
    _vdpau = 'false'
  endif
elif not with_platform_x11
  if _vdpau == 'true'
    error('VDPAU state tracker requires X11 support.')
  else
    _vdpau = 'false'
  endif
elif not (with_gallium_r300 or with_gallium_r600 or with_gallium_radeonsi or
          with_gallium_nouveau)
  if _vdpau == 'true'
    error('VDPAU state tracker requires at least one of the following gallium drivers: r300, r600, radeonsi, nouveau.')
  else
    _vdpau = 'false'
  endif
endif
dep_vdpau = null_dep
with_gallium_vdpau = false
if _vdpau != 'false'
  dep_vdpau = dependency('vdpau', version : '>= 1.1', required : _vdpau == 'true')
  if dep_vdpau.found()
    dep_vdpau = declare_dependency(
      compile_args : run_command(prog_pkgconfig, ['vdpau', '--cflags']).stdout().split()
    )
    with_gallium_vdpau = true
  endif
endif

if with_gallium_vdpau
  pre_args += '-DHAVE_ST_VDPAU'
endif
vdpau_drivers_path = get_option('vdpau-libs-path')
if vdpau_drivers_path == ''
  vdpau_drivers_path = join_paths(get_option('libdir'), 'vdpau')
endif

_xvmc = get_option('gallium-xvmc')
if not system_has_kms_drm
  if _xvmc == 'true'
    error('XVMC state tracker can only be build on unix-like OSes.')
  else
    _xvmc = 'false'
  endif
elif not with_platform_x11
  if _xvmc == 'true'
    error('XVMC state tracker requires X11 support.')
  else
    _xvmc = 'false'
  endif
elif not (with_gallium_r600 or with_gallium_nouveau)
  if _xvmc == 'true'
    error('XVMC state tracker requires at least one of the following gallium drivers: r600, nouveau.')
  else
    _xvmc = 'false'
  endif
endif
dep_xvmc = null_dep
with_gallium_xvmc = false
if _xvmc != 'false'
  dep_xvmc = dependency('xvmc', version : '>= 1.0.6', required : _xvmc == 'true')
  with_gallium_xvmc = dep_xvmc.found()
endif

xvmc_drivers_path = get_option('xvmc-libs-path')
if xvmc_drivers_path == ''
  xvmc_drivers_path = get_option('libdir')
endif

_omx = get_option('gallium-omx')
if not system_has_kms_drm
  if ['auto', 'disabled'].contains(_omx)
    _omx = 'disabled'
  else
    error('OMX state tracker can only be built on unix-like OSes.')
  endif
elif not (with_gallium_r600 or with_gallium_radeonsi or with_gallium_nouveau)
  if ['auto', 'disabled'].contains(_omx)
    _omx = 'disabled'
  else
    error('OMX state tracker requires at least one of the following gallium drivers: r600, radeonsi, nouveau.')
  endif
endif
with_gallium_omx = _omx
dep_omx = null_dep
dep_omx_other = []
if ['auto', 'bellagio'].contains(_omx)
  dep_omx = dependency(
    'libomxil-bellagio', required : _omx == 'bellagio'
  )
  if dep_omx.found()
    with_gallium_omx = 'bellagio'
  endif
endif
if ['auto', 'tizonia'].contains(_omx)
  if with_dri and with_egl
    dep_omx = dependency(
      'libtizonia', version : '>= 0.10.0',
      required : _omx == 'tizonia',
    )
    dep_omx_other = [
      dependency('libtizplatform', required : _omx == 'tizonia'),
      dependency('tizilheaders', required : _omx == 'tizonia'),
    ]
    if dep_omx.found() and dep_omx_other[0].found() and dep_omx_other[1].found()
      with_gallium_omx = 'tizonia'
    endif
  elif _omx == 'tizonia'
    error('OMX-Tizonia state tracker requires dri and egl')
  endif
endif
if _omx == 'auto'
  with_gallium_omx = 'disabled'
else
  with_gallium_omx = _omx
endif

pre_args += [
  '-DENABLE_ST_OMX_BELLAGIO=' + (with_gallium_omx == 'bellagio' ? '1' : '0'),
  '-DENABLE_ST_OMX_TIZONIA=' + (with_gallium_omx == 'tizonia' ? '1' : '0'),
]


omx_drivers_path = get_option('omx-libs-path')

if with_gallium_omx != 'disabled'
  # Figure out where to put the omx driver.
  # FIXME: this could all be vastly simplified by adding a 'defined_variable'
  # argument to meson's get_pkgconfig_variable method.
  if omx_drivers_path == ''
    _omx_libdir = dep_omx.get_pkgconfig_variable('libdir')
    _omx_drivers_dir = dep_omx.get_pkgconfig_variable('pluginsdir')
    if _omx_libdir == get_option('libdir')
      omx_drivers_path = _omx_drivers_dir
    else
      _omx_base_dir = []
      # This will fail on windows. Does OMX run on windows?
      _omx_libdir = _omx_libdir.split('/')
      _omx_drivers_dir = _omx_drivers_dir.split('/')
      foreach o : _omx_drivers_dir
        if not _omx_libdir.contains(o)
          _omx_base_dir += o
        endif
      endforeach
      omx_drivers_path = join_paths(get_option('libdir'), _omx_base_dir)
    endif
  endif
endif

_va = get_option('gallium-va')
if not system_has_kms_drm
  if _va == 'true'
    error('VA state tracker can only be built on unix-like OSes.')
  else
    _va = 'false'
  endif
elif not (with_gallium_r600 or with_gallium_radeonsi or with_gallium_nouveau)
  if _va == 'true'
    error('VA state tracker requires at least one of the following gallium drivers: r600, radeonsi, nouveau.')
  else
    _va = 'false'
  endif
endif
with_gallium_va = false
dep_va = null_dep
if _va != 'false'
  dep_va = dependency('libva', version : '>= 0.38.0', required : _va == 'true')
  if dep_va.found()
    dep_va_headers = declare_dependency(
      compile_args : run_command(prog_pkgconfig, ['libva', '--cflags']).stdout().split()
    )
    with_gallium_va = true
  endif
endif

va_drivers_path = get_option('va-libs-path')
if va_drivers_path == ''
  va_drivers_path = join_paths(get_option('libdir'), 'dri')
endif

_xa = get_option('gallium-xa')
if not system_has_kms_drm
  if _xa == 'true'
    error('XA state tracker can only be built on unix-like OSes.')
  else
    _xa = 'false'
  endif
elif not (with_gallium_nouveau or with_gallium_freedreno or with_gallium_i915
          or with_gallium_svga)
  if _xa == 'true'
    error('XA state tracker requires at least one of the following gallium drivers: nouveau, freedreno, i915, svga.')
  else
    _xa = 'false'
  endif
endif
with_gallium_xa = _xa != 'false'

d3d_drivers_path = get_option('d3d-drivers-path')
if d3d_drivers_path == ''
  d3d_drivers_path = join_paths(get_option('prefix'), get_option('libdir'), 'd3d')
endif

with_gallium_st_nine =  get_option('gallium-nine')
if with_gallium_st_nine
  if not with_gallium_softpipe
    error('The nine state tracker requires gallium softpipe/llvmpipe.')
  elif not (with_gallium_radeonsi or with_gallium_nouveau or with_gallium_r600
            or with_gallium_r300 or with_gallium_svga or with_gallium_i915
            or with_gallium_iris)
    error('The nine state tracker requires at least one non-swrast gallium driver.')
  endif
  if not with_dri3
    error('Using nine with wine requires dri3')
  endif
endif

if get_option('power8') != 'false'
  # on old versions of meson the cpu family would return as ppc64le on little
  # endian power8, this was changed in 0.48 such that the family would always
  # be ppc64 regardless of endianness, and then the machine.endian() value
  # should be checked. Since we support versions < 0.48 we need to use
  # startswith.
  if host_machine.cpu_family().startswith('ppc64') and host_machine.endian() == 'little'
    if cc.get_id() == 'gcc' and cc.version().version_compare('< 4.8')
      error('Altivec is not supported with gcc version < 4.8.')
    endif
    if cc.compiles('''
        #include <altivec.h>
        int main() {
          vector unsigned char r;
          vector unsigned int v = vec_splat_u32 (1);
          r = __builtin_vec_vgbbd ((vector unsigned char) v);
          return 0;
        }''',
        args : '-mpower8-vector',
        name : 'POWER8 intrinsics')
      pre_args += ['-D_ARCH_PWR8', '-mpower8-vector']
    elif get_option('power8') == 'true'
      error('POWER8 intrinsic support required but not found.')
    endif
  endif
endif

_opencl = get_option('gallium-opencl')
clover_cpp_std = []
if _opencl != 'disabled'
  if not with_gallium
    error('OpenCL Clover implementation requires at least one gallium driver.')
  endif

  dep_clc = dependency('libclc')
  with_gallium_opencl = true
  with_opencl_icd = _opencl == 'icd'

  if host_machine.cpu_family().startswith('ppc') and cpp.compiles('''
      #if !defined(__VEC__) || !defined(__ALTIVEC__)
      #error "AltiVec not enabled"
      #endif''',
      name : 'Altivec')
    clover_cpp_std += ['cpp_std=gnu++11']
  endif
else
  dep_clc = null_dep
  with_gallium_opencl = false
  with_opencl_icd = false
endif

gl_pkgconfig_c_flags = []
if with_platform_x11
  if with_any_vk or with_egl or (with_glx == 'dri' and with_dri_platform == 'drm')
    pre_args += '-DHAVE_X11_PLATFORM'
  endif
  if with_glx == 'xlib' or with_glx == 'gallium-xlib'
    pre_args += '-DUSE_XSHM'
  else
    pre_args += '-DGLX_INDIRECT_RENDERING'
    if with_glx_direct
      pre_args += '-DGLX_DIRECT_RENDERING'
    endif
    if with_dri_platform == 'drm'
      pre_args += '-DGLX_USE_DRM'
    elif with_dri_platform == 'apple'
      pre_args += '-DGLX_USE_APPLEGL'
    elif with_dri_platform == 'windows'
      pre_args += '-DGLX_USE_WINDOWSGL'
    endif
  endif
else
  pre_args += '-DMESA_EGL_NO_X11_HEADERS'
  gl_pkgconfig_c_flags += '-DMESA_EGL_NO_X11_HEADERS'
endif
if with_platform_drm
  if with_egl and not with_gbm
    error('EGL drm platform requires gbm')
  endif
  pre_args += '-DHAVE_DRM_PLATFORM'
endif
if with_platform_surfaceless
  pre_args += '-DHAVE_SURFACELESS_PLATFORM'
endif
if with_platform_android
  dep_android = [
    dependency('cutils'),
    dependency('hardware'),
    dependency('sync'),
  ]
  if get_option('platform-sdk-version') >= 26
    dep_android += dependency('nativewindow')
  endif
  pre_args += '-DHAVE_ANDROID_PLATFORM'
endif
if with_platform_haiku
  pre_args += '-DHAVE_HAIKU_PLATFORM'
endif

prog_python = import('python3').find_python()
has_mako = run_command(
  prog_python, '-c',
  '''
from distutils.version import StrictVersion
import mako
assert StrictVersion(mako.__version__) > StrictVersion("0.8.0")
  ''')
if has_mako.returncode() != 0
  error('Python (3.x) mako module >= 0.8.0 required to build mesa.')
endif

if cc.get_id() == 'gcc' and cc.version().version_compare('< 4.4.6')
  error('When using GCC, version 4.4.6 or later is required.')
endif

# Define DEBUG for debug builds only (debugoptimized is not included on this one)
if get_option('buildtype') == 'debug'
  pre_args += '-DDEBUG'
endif

with_shader_cache = false
_shader_cache = get_option('shader-cache')
if _shader_cache != 'false'
  if host_machine.system() == 'windows'
    if _shader_cache == 'true'
      error('Shader Cache does not currently work on Windows')
    endif
  else
    pre_args += '-DENABLE_SHADER_CACHE'
    with_shader_cache = true
  endif
endif
if with_amd_vk and not with_shader_cache
  error('Radv requires shader cache support')
endif

# Check for GCC style builtins
foreach b : ['bswap32', 'bswap64', 'clz', 'clzll', 'ctz', 'expect', 'ffs',
             'ffsll', 'popcount', 'popcountll', 'unreachable']
  if cc.has_function(b)
    pre_args += '-DHAVE___BUILTIN_@0@'.format(b.to_upper())
  endif
endforeach

# check for GCC __attribute__
foreach a : ['const', 'flatten', 'malloc', 'pure', 'unused',
             'warn_unused_result', 'weak',]
  if cc.compiles('int foo(void) __attribute__((@0@));'.format(a),
                 name : '__attribute__((@0@))'.format(a))
    pre_args += '-DHAVE_FUNC_ATTRIBUTE_@0@'.format(a.to_upper())
  endif
endforeach
if cc.compiles('int foo(const char *p, ...) __attribute__((format(printf, 1, 2)));',
               name : '__attribute__((format(...)))')
  pre_args += '-DHAVE_FUNC_ATTRIBUTE_FORMAT'
endif
if cc.compiles('struct __attribute__((packed)) foo { int bar; };',
               name : '__attribute__((packed))')
  pre_args += '-DHAVE_FUNC_ATTRIBUTE_PACKED'
endif
if cc.compiles('int *foo(void) __attribute__((returns_nonnull));',
               name : '__attribute__((returns_nonnull))')
  pre_args += '-DHAVE_FUNC_ATTRIBUTE_RETURNS_NONNULL'
endif
if cc.compiles('''int foo_def(void) __attribute__((visibility("default")));
                  int foo_hid(void) __attribute__((visibility("hidden")));
                  int foo_int(void) __attribute__((visibility("internal")));
                  int foo_pro(void) __attribute__((visibility("protected")));''',
               name : '__attribute__((visibility(...)))')
  pre_args += '-DHAVE_FUNC_ATTRIBUTE_VISIBILITY'
endif
if cc.compiles('int foo(void) { return 0; } int bar(void) __attribute__((alias("foo")));',
               name : '__attribute__((alias(...)))')
  pre_args += '-DHAVE_FUNC_ATTRIBUTE_ALIAS'
endif
if cc.compiles('int foo(void) __attribute__((__noreturn__));',
               name : '__attribute__((__noreturn__))')
  pre_args += '-DHAVE_FUNC_ATTRIBUTE_NORETURN'
endif
if cc.compiles('__uint128_t foo(void) { return 0; }',
               name : '__uint128_t')
  pre_args += '-DHAVE_UINT128'
endif

# TODO: this is very incomplete
if ['linux', 'cygwin', 'gnu'].contains(host_machine.system())
  pre_args += '-D_GNU_SOURCE'
endif

# Check for generic C arguments
c_args = []
foreach a : ['-Werror=implicit-function-declaration',
             '-Werror=missing-prototypes', '-Werror=return-type',
             '-Werror=incompatible-pointer-types',
             '-Werror=format',
             '-Wformat-security',
             '-fno-math-errno',
             '-fno-trapping-math', '-Qunused-arguments']
  if cc.has_argument(a)
    c_args += a
  endif
endforeach

foreach a : ['missing-field-initializers', 'format-truncation']
  if cc.has_argument('-W' + a)
    c_args += '-Wno-' + a
  endif
endforeach

c_vis_args = []
if cc.has_argument('-fvisibility=hidden')
  c_vis_args += '-fvisibility=hidden'
endif

# Check for generic C++ arguments
cpp_args = []
foreach a : ['-Werror=return-type',
             '-Werror=format',
             '-Wformat-security',
             '-fno-math-errno', '-fno-trapping-math',
             '-Qunused-arguments']
  if cpp.has_argument(a)
    cpp_args += a
  endif
endforeach

# For some reason, the test for -Wno-foo always succeeds with gcc, even if the
# option is not supported. Hence, check for -Wfoo instead.

foreach a : ['non-virtual-dtor', 'missing-field-initializers', 'format-truncation']
  if cpp.has_argument('-W' + a)
    cpp_args += '-Wno-' + a
  endif
endforeach

no_override_init_args = []
foreach a : ['override-init', 'initializer-overrides']
  if cc.has_argument('-W' + a)
    no_override_init_args += '-Wno-' + a
  endif
endforeach

cpp_vis_args = []
if cpp.has_argument('-fvisibility=hidden')
  cpp_vis_args += '-fvisibility=hidden'
endif

# Check for C and C++ arguments for MSVC2013 compatibility. These are only used
# in parts of the mesa code base that need to compile with old versions of
# MSVC, mainly common code
c_msvc_compat_args = []
cpp_msvc_compat_args = []
foreach a : ['-Werror=pointer-arith', '-Werror=vla']
  if cc.has_argument(a)
    c_msvc_compat_args += a
  endif
  if cpp.has_argument(a)
    cpp_msvc_compat_args += a
  endif
endforeach

if host_machine.cpu_family().startswith('x86')
  pre_args += '-DUSE_SSE41'
  with_sse41 = true
  sse41_args = ['-msse4.1']

  # GCC on x86 (not x86_64) with -msse* assumes a 16 byte aligned stack, but
  # that's not guaranteed
  if host_machine.cpu_family() == 'x86'
    sse41_args += '-mstackrealign'
  endif
else
  with_sse41 = false
  sse41_args = []
endif

# Check for GCC style atomics
dep_atomic = null_dep

if cc.compiles('''#include <stdint.h>
                  int main() {
                    struct {
                      uint64_t *v;
                    } x;
                    return (int)__atomic_load_n(x.v, __ATOMIC_ACQUIRE) &
                           (int)__atomic_add_fetch(x.v, (uint64_t)1, __ATOMIC_ACQ_REL);

                  }''',
               name : 'GCC atomic builtins')
  pre_args += '-DUSE_GCC_ATOMIC_BUILTINS'

  # Not all atomic calls can be turned into lock-free instructions, in which
  # GCC will make calls into the libatomic library. Check whether we need to
  # link with -latomic.
  #
  # This can happen for 64-bit atomic operations on 32-bit architectures such
  # as ARM.
  if not cc.links('''#include <stdint.h>
                     int main() {
                       struct {
                         uint64_t *v;
                       } x;
                       return (int)__atomic_load_n(x.v, __ATOMIC_ACQUIRE) &
                              (int)__atomic_add_fetch(x.v, (uint64_t)1, __ATOMIC_ACQ_REL);
                     }''',
                  name : 'GCC atomic builtins required -latomic')
    dep_atomic = cc.find_library('atomic')
  endif
endif
if not cc.links('''#include <stdint.h>
                   uint64_t v;
                   int main() {
                     return __sync_add_and_fetch(&v, (uint64_t)1);
                   }''',
                dependencies : dep_atomic,
                name : 'GCC 64bit atomics')
  pre_args += '-DMISSING_64BIT_ATOMICS'
endif

# TODO: shared/static? Is this even worth doing?

# When cross compiling we generally need to turn off the use of assembly,
# because mesa's assembly relies on building an executable for the host system,
# and running it to get information about struct sizes. There is at least one
# case of cross compiling where we can use asm, and that's x86_64 -> x86 when
# host OS == build OS, since in that case the build machine can run the host's
# binaries.
if with_asm and meson.is_cross_build()
  if build_machine.system() != host_machine.system()
    # TODO: It may be possible to do this with an exe_wrapper (like wine).
    message('Cross compiling from one OS to another, disabling assembly.')
    with_asm = false
  elif not (build_machine.cpu_family().startswith('x86') and host_machine.cpu_family() == 'x86')
    # FIXME: Gentoo always sets -m32 for x86_64 -> x86 builds, resulting in an
    # x86 -> x86 cross compile. We use startswith rather than == to handle this
    # case.
    # TODO: There may be other cases where the 64 bit version of the
    # architecture can run 32 bit binaries (aarch64 and armv7 for example)
    message('''
      Cross compiling to different architectures, and the host cannot run
      the build machine's binaries. Disabling assembly.
    ''')
    with_asm = false
  endif
endif

with_asm_arch = ''
if with_asm
  if host_machine.cpu_family() == 'x86'
    if system_has_kms_drm or host_machine.system() == 'gnu'
      with_asm_arch = 'x86'
      pre_args += ['-DUSE_X86_ASM', '-DUSE_MMX_ASM', '-DUSE_3DNOW_ASM',
                   '-DUSE_SSE_ASM']

      if with_glx_read_only_text
         pre_args += ['-DGLX_X86_READONLY_TEXT']
      endif
    endif
  elif host_machine.cpu_family() == 'x86_64'
    if system_has_kms_drm
      with_asm_arch = 'x86_64'
      pre_args += ['-DUSE_X86_64_ASM']
    endif
  elif host_machine.cpu_family() == 'arm'
    if system_has_kms_drm
      with_asm_arch = 'arm'
      pre_args += ['-DUSE_ARM_ASM']
    endif
  elif host_machine.cpu_family() == 'aarch64'
    if system_has_kms_drm
      with_asm_arch = 'aarch64'
      pre_args += ['-DUSE_AARCH64_ASM']
    endif
  elif host_machine.cpu_family() == 'sparc64'
    if system_has_kms_drm
      with_asm_arch = 'sparc'
      pre_args += ['-DUSE_SPARC_ASM']
    endif
  elif host_machine.cpu_family().startswith('ppc64') and host_machine.endian() == 'little'
    if system_has_kms_drm
      with_asm_arch = 'ppc64le'
      pre_args += ['-DUSE_PPC64LE_ASM']
    endif
  endif
endif

# Check for standard headers and functions
if cc.has_header_symbol('sys/sysmacros.h', 'major')
  pre_args += '-DMAJOR_IN_SYSMACROS'
elif cc.has_header_symbol('sys/mkdev.h', 'major')
  pre_args += '-DMAJOR_IN_MKDEV'
endif

foreach h : ['xlocale.h', 'sys/sysctl.h', 'linux/futex.h', 'endian.h', 'dlfcn.h', 'execinfo.h', 'sys/shm.h']
  if cc.compiles('#include <@0@>'.format(h), name : '@0@'.format(h))
    pre_args += '-DHAVE_@0@'.format(h.to_upper().underscorify())
  endif
endforeach

foreach f : ['strtof', 'mkostemp', 'posix_memalign', 'timespec_get', 'memfd_create']
  if cc.has_function(f)
    pre_args += '-DHAVE_@0@'.format(f.to_upper())
  endif
endforeach

# strtod locale support
if cc.links('''
    #define _GNU_SOURCE
    #include <stdlib.h>
    #include <locale.h>
    #ifdef HAVE_XLOCALE_H
    #include <xlocale.h>
    #endif
    int main() {
      locale_t loc = newlocale(LC_CTYPE_MASK, "C", NULL);
      const char *s = "1.0";
      char *end;
      double d = strtod_l(s, end, loc);
      float f = strtof_l(s, end, loc);
      freelocale(loc);
      return 0;
    }''',
    args : pre_args,
    name : 'strtod has locale support')
  pre_args += '-DHAVE_STRTOD_L'
endif

# Check for some linker flags
ld_args_bsymbolic = []
if cc.links('int main() { return 0; }', args : '-Wl,-Bsymbolic', name : 'Bsymbolic')
  ld_args_bsymbolic += '-Wl,-Bsymbolic'
endif
ld_args_gc_sections = []
if cc.links('static char unused() { return 5; } int main() { return 0; }',
            args : '-Wl,--gc-sections', name : 'gc-sections')
  ld_args_gc_sections += '-Wl,--gc-sections'
endif
with_ld_version_script = false
if cc.links('int main() { return 0; }',
            args : '-Wl,--version-script=@0@'.format(
              join_paths(meson.source_root(), 'build-support/conftest.map')),
            name : 'version-script')
  with_ld_version_script = true
endif
with_ld_dynamic_list = false
if cc.links('int main() { return 0; }',
            args : '-Wl,--dynamic-list=@0@'.format(
              join_paths(meson.source_root(), 'build-support/conftest.dyn')),
            name : 'dynamic-list')
  with_ld_dynamic_list = true
endif
ld_args_build_id = []
if build_machine.system() != 'darwin'
   ld_args_build_id += '-Wl,--build-id=sha1'
endif

# check for dl support
if cc.has_function('dlopen')
  dep_dl = null_dep
else
  dep_dl = cc.find_library('dl')
endif
if cc.has_function('dladdr', dependencies : dep_dl)
  # This is really only required for megadrivers
  pre_args += '-DHAVE_DLADDR'
endif

if cc.has_function('dl_iterate_phdr')
  pre_args += '-DHAVE_DL_ITERATE_PHDR'
elif with_intel_vk
  error('Intel "Anvil" Vulkan driver requires the dl_iterate_phdr function')
elif with_dri_i965 and with_shader_cache
  error('Intel i965 GL driver requires dl_iterate_phdr when built with shader caching.')
endif

# Determine whether or not the rt library is needed for time functions
if cc.has_function('clock_gettime')
  dep_clock = null_dep
else
  dep_clock = cc.find_library('rt')
endif

# TODO: some of these may be conditional
dep_zlib = dependency('zlib', version : '>= 1.2.3')
pre_args += '-DHAVE_ZLIB'
dep_thread = dependency('threads')
if dep_thread.found() and host_machine.system() != 'windows'
  pre_args += '-DHAVE_PTHREAD'
  if cc.has_function(
      'pthread_setaffinity_np',
      dependencies : dep_thread,
      prefix : '#include <pthread.h>',
      args : '-D_GNU_SOURCE')
    pre_args += '-DHAVE_PTHREAD_SETAFFINITY'
  endif
endif
dep_expat = dependency('expat')
# this only exists on linux so either this is linux and it will be found, or
# it's not linux and wont
dep_m = cc.find_library('m', required : false)

# Check for libdrm. Various drivers have different libdrm version requirements,
# but we always want to use the same version for all libdrm modules. That means
# even if driver foo requires 2.4.0 and driver bar requires 2.4.3, if foo and
# bar are both on use 2.4.3 for both of them
dep_libdrm_amdgpu = null_dep
dep_libdrm_radeon = null_dep
dep_libdrm_nouveau = null_dep
dep_libdrm_intel = null_dep

_drm_amdgpu_ver = '2.4.97'
_drm_radeon_ver = '2.4.71'
_drm_nouveau_ver = '2.4.66'
_drm_intel_ver = '2.4.75'
_drm_ver = '2.4.75'

_libdrm_checks = [
  ['intel', with_dri_i915 or with_gallium_i915],
  ['amdgpu', with_amd_vk or with_gallium_radeonsi],
  ['radeon', (with_gallium_radeonsi or with_dri_r100 or with_dri_r200 or
              with_gallium_r300 or with_gallium_r600)],
  ['nouveau', (with_gallium_nouveau or with_dri_nouveau)],
]

# VC4 only needs core libdrm support of this version, not a libdrm_vc4
# library.
if with_gallium_vc4
  _drm_ver = '2.4.89'
endif

# etnaviv only needs core libdrm
if with_gallium_etnaviv
  _drm_ver = '2.4.89'
endif

# Loop over the enables versions and get the highest libdrm requirement for all
# active drivers.
_drm_blame = ''
foreach d : _libdrm_checks
  ver = get_variable('_drm_@0@_ver'.format(d[0]))
  if d[1] and ver.version_compare('>' + _drm_ver)
    _drm_ver = ver
    _drm_blame = d[0]
  endif
endforeach
if _drm_blame != ''
  message('libdrm @0@ needed because @1@ has the highest requirement'.format(_drm_ver, _drm_blame))
endif

# Then get each libdrm module
foreach d : _libdrm_checks
  if d[1]
    set_variable(
      'dep_libdrm_' + d[0],
      dependency('libdrm_' + d[0], version : '>=' + _drm_ver)
    )
  endif
endforeach

with_gallium_drisw_kms = false
dep_libdrm = dependency(
  'libdrm', version : '>=' + _drm_ver,
  required : with_dri2 or with_dri3
)
if dep_libdrm.found()
  pre_args += '-DHAVE_LIBDRM'
  if with_dri_platform == 'drm' and with_dri
    with_gallium_drisw_kms = true
  endif
endif

llvm_modules = ['bitwriter', 'engine', 'mcdisassembler', 'mcjit']
llvm_optional_modules = []
if with_amd_vk or with_gallium_radeonsi or with_gallium_r600
  llvm_modules += ['amdgpu', 'native', 'bitreader', 'ipo']
  if with_gallium_r600
    llvm_modules += 'asmparser'
  endif
endif
if with_gallium_opencl
  llvm_modules += [
    'all-targets', 'linker', 'coverage', 'instrumentation', 'ipo', 'irreader',
    'lto', 'option', 'objcarcopts', 'profiledata',
  ]
  llvm_optional_modules += ['coroutines']
endif

if with_amd_vk or with_gallium_radeonsi
  _llvm_version = '>= 7.0.0'
elif with_gallium_swr
  _llvm_version = '>= 6.0.0'
elif with_gallium_opencl or with_gallium_r600
  _llvm_version = '>= 3.9.0'
else
  _llvm_version = '>= 3.3.0'
endif

_shared_llvm = get_option('shared-llvm')

_llvm = get_option('llvm')
dep_llvm = null_dep
with_llvm = false
if _llvm != 'false'
  dep_llvm = dependency(
    'llvm',
    version : _llvm_version,
    modules : llvm_modules,
    optional_modules : llvm_optional_modules,
    required : (
      with_amd_vk or with_gallium_radeonsi or with_gallium_swr or
      with_gallium_opencl or _llvm == 'true'
    ),
    static : not _shared_llvm,
    method : 'config-tool',
  )
  with_llvm = dep_llvm.found()
endif
if with_llvm
  _llvm_version = dep_llvm.version().split('.')
  pre_args += [
    '-DHAVE_LLVM=0x0@0@0@1@'.format(_llvm_version[0], _llvm_version[1]),
    '-DMESA_LLVM_VERSION_STRING="@0@"'.format(dep_llvm.version()),
  ]

  # LLVM can be built without rtti, turning off rtti changes the ABI of C++
  # programs, so we need to build all C++ code in mesa without rtti as well to
  # ensure that linking works.
  if dep_llvm.get_configtool_variable('has-rtti') == 'NO'
    if with_gallium_nouveau
      error('The Nouveau driver requires rtti. You either need to turn off nouveau or use an LLVM built with LLVM_ENABLE_RTTI.')
    elif with_gallium_opencl
      error('The Clover OpenCL state tracker requires rtti, you need to turn off clover or use an LLVM built with LLVM_ENABLE_RTTI.')
    endif
    cpp_args += '-fno-rtti'
  endif
elif with_amd_vk or with_gallium_radeonsi or with_gallium_swr
  error('The following drivers require LLVM: Radv, RadeonSI, SWR. One of these is enabled, but LLVM is disabled.')
elif with_gallium_opencl
  error('The OpenCL "Clover" state tracker requires LLVM, but LLVM is disabled.')
endif

if (with_amd_vk or with_gallium_radeonsi or with_gallium_opencl or
    (with_gallium_r600 and with_llvm))
  dep_elf = dependency('libelf', required : false)
  if not dep_elf.found()
    dep_elf = cc.find_library('elf')
  endif
else
  dep_elf = null_dep
endif

dep_glvnd = null_dep
if with_glvnd
  dep_glvnd = dependency('libglvnd', version : '>= 0.2.0')
  pre_args += '-DUSE_LIBGLVND=1'
endif

if with_valgrind != 'false'
  dep_valgrind = dependency('valgrind', required : with_valgrind == 'true')
  if dep_valgrind.found()
    pre_args += '-DHAVE_VALGRIND'
  endif
else
  dep_valgrind = null_dep
endif

# pthread stubs. Lets not and say we didn't

prog_bison = find_program('bison', required : with_any_opengl)
prog_flex = find_program('flex', required : with_any_opengl)

dep_selinux = null_dep
if get_option('selinux')
  dep_selinux = dependency('libselinux')
  pre_args += '-DMESA_SELINUX'
endif

if with_libunwind != 'false'
  dep_unwind = dependency('libunwind', required : with_libunwind == 'true')
  if dep_unwind.found()
    pre_args += '-DHAVE_LIBUNWIND'
  endif
else
  dep_unwind = null_dep
endif

if with_osmesa != 'none'
  if with_osmesa == 'classic' and not with_dri_swrast
    error('OSMesa classic requires dri (classic) swrast.')
  endif
  if with_osmesa == 'gallium' and not with_gallium_softpipe
    error('OSMesa gallium requires gallium softpipe or llvmpipe.')
  endif
  osmesa_lib_name = 'OSMesa'
  osmesa_bits = get_option('osmesa-bits')
  if osmesa_bits != '8'
    if with_dri or with_glx != 'disabled'
      error('OSMesa bits must be 8 if building glx or dir based drivers')
    endif
    osmesa_lib_name = osmesa_lib_name + osmesa_bits
    pre_args += [
      '-DCHAN_BITS=@0@'.format(osmesa_bits), '-DDEFAULT_SOFTWARE_DEPTH_BITS=31'
    ]
  endif
endif

# TODO: symbol mangling

if with_platform_wayland
  dep_wl_scanner = dependency('wayland-scanner', native: true)
  prog_wl_scanner = find_program(dep_wl_scanner.get_pkgconfig_variable('wayland_scanner'))
  if dep_wl_scanner.version().version_compare('>= 1.15')
    wl_scanner_arg = 'private-code'
  else
    wl_scanner_arg = 'code'
  endif
  dep_wl_protocols = dependency('wayland-protocols', version : '>= 1.8')
  dep_wayland_client = dependency('wayland-client', version : '>=1.11')
  dep_wayland_server = dependency('wayland-server', version : '>=1.11')
  if with_egl
    dep_wayland_egl = dependency('wayland-egl-backend', version : '>= 3')
    dep_wayland_egl_headers = declare_dependency(
      compile_args : run_command(prog_pkgconfig, ['wayland-egl-backend', '--cflags']).stdout().split())
  endif
  wayland_dmabuf_xml = join_paths(
    dep_wl_protocols.get_pkgconfig_variable('pkgdatadir'), 'unstable',
    'linux-dmabuf', 'linux-dmabuf-unstable-v1.xml'
  )
  pre_args += ['-DHAVE_WAYLAND_PLATFORM', '-DWL_HIDE_DEPRECATED']
endif

dep_x11 = null_dep
dep_xext = null_dep
dep_xdamage = null_dep
dep_xfixes = null_dep
dep_x11_xcb = null_dep
dep_xcb = null_dep
dep_xcb_glx = null_dep
dep_xcb_dri2 = null_dep
dep_xcb_dri3 = null_dep
dep_dri2proto = null_dep
dep_glproto = null_dep
dep_xxf86vm = null_dep
dep_xcb_dri3 = null_dep
dep_xcb_present = null_dep
dep_xcb_sync = null_dep
dep_xcb_xfixes = null_dep
dep_xshmfence = null_dep
dep_xcb_xrandr = null_dep
dep_xlib_xrandr = null_dep
if with_platform_x11
  if with_glx == 'xlib' or with_glx == 'gallium-xlib'
    dep_x11 = dependency('x11')
    dep_xext = dependency('xext')
    dep_xcb = dependency('xcb')
  elif with_glx == 'dri'
    dep_x11 = dependency('x11')
    dep_xext = dependency('xext')
    dep_xdamage = dependency('xdamage', version : '>= 1.1')
    dep_xfixes = dependency('xfixes')
    dep_xcb_glx = dependency('xcb-glx', version : '>= 1.8.1')
  endif
  if (with_any_vk or with_glx == 'dri' or with_egl or
       (with_gallium_vdpau or with_gallium_xvmc or with_gallium_va or
        with_gallium_omx != 'disabled'))
    dep_xcb = dependency('xcb')
    dep_x11_xcb = dependency('x11-xcb')
  endif
  if with_any_vk or with_egl or (with_glx == 'dri' and with_dri_platform == 'drm')
    dep_xcb_dri2 = dependency('xcb-dri2', version : '>= 1.8')

    if with_dri3
      pre_args += '-DHAVE_DRI3'
      dep_xcb_dri3 = dependency('xcb-dri3')
      dep_xcb_present = dependency('xcb-present')
      # until xcb-dri3 has been around long enough to make a hard-dependency:
      if (dep_xcb_dri3.version().version_compare('>= 1.13') and
          dep_xcb_present.version().version_compare('>= 1.13'))
        pre_args += '-DHAVE_DRI3_MODIFIERS'
      endif
      dep_xcb_sync = dependency('xcb-sync')
      dep_xshmfence = dependency('xshmfence', version : '>= 1.1')
    endif
  endif
  if with_glx == 'dri' or with_glx == 'gallium-xlib'
    dep_glproto = dependency('glproto', version : '>= 1.4.14')
  endif
  if with_glx == 'dri' 
    if with_dri_platform == 'drm'
      dep_dri2proto = dependency('dri2proto', version : '>= 2.8')
      dep_xxf86vm = dependency('xxf86vm')
    endif
  endif
  if (with_egl or (
      with_gallium_vdpau or with_gallium_xvmc or with_gallium_xa or
      with_gallium_omx != 'disabled'))
    dep_xcb_xfixes = dependency('xcb-xfixes')
  endif
  if with_xlib_lease
    dep_xcb_xrandr = dependency('xcb-randr')
    dep_xlib_xrandr = dependency('xrandr', version : '>= 1.3')
  endif
endif

if get_option('gallium-extra-hud')
  pre_args += '-DHAVE_GALLIUM_EXTRA_HUD=1'
endif

_sensors = get_option('lmsensors')
if _sensors != 'false'
  dep_lmsensors = cc.find_library('sensors', required : _sensors == 'true')
  if dep_lmsensors.found()
    pre_args += '-DHAVE_LIBSENSORS=1'
  endif
else
  dep_lmsensors = null_dep
endif

foreach a : pre_args
  add_project_arguments(a, language : ['c', 'cpp'])
endforeach
foreach a : c_args
  add_project_arguments(a, language : ['c'])
endforeach
foreach a : cpp_args
  add_project_arguments(a, language : ['cpp'])
endforeach

gl_priv_reqs = []

if with_glx == 'xlib' or with_glx == 'gallium-xlib'
  gl_priv_reqs += ['x11', 'xext', 'xcb']
elif with_glx == 'dri'
  gl_priv_reqs += [
    'x11', 'xext', 'xdamage >= 1.1', 'xfixes', 'x11-xcb', 'xcb',
    'xcb-glx >= 1.8.1']
  if with_dri_platform == 'drm'
    gl_priv_reqs += 'xcb-dri2 >= 1.8'
    gl_priv_reqs += 'xxf86vm'
  endif
endif
if dep_libdrm.found()
  gl_priv_reqs += 'libdrm >= 2.4.75'
endif

gl_priv_libs = []
if dep_thread.found()
  gl_priv_libs += ['-lpthread', '-pthread']
endif
if dep_m.found()
  gl_priv_libs += '-lm'
endif
if dep_dl.found()
  gl_priv_libs += '-ldl'
endif

pkg = import('pkgconfig')

prog_nm = find_program('nm', required : false)
env_test = environment()
if prog_nm.found()
  env_test.set('NM', prog_nm.path())
endif

# This quirk needs to be applied to sources with functions defined in assembly
# as GCC LTO drops them. See: https://bugs.freedesktop.org/show_bug.cgi?id=109391
gcc_lto_quirk = (cc.get_id() == 'gcc') ? ['-fno-lto'] : []

subdir('include')
subdir('bin')
subdir('src')

# Meson 0.49 and earlier seems to have a bug that fails to evaluate the string-
# formatting below unless the first argument is passed as a variable. This has
# been fixed in Meson 0.50 and beyond, but we need to keep it like this for now
# for backwards compatibility.
_with_opengl_string = with_opengl ? 'yes' : 'no'

lines = ['',
  'prefix:          ' + get_option('prefix'),
  'libdir:          ' + get_option('libdir'),
  'includedir:      ' + get_option('includedir'),
  '',
  'OpenGL:          @0@ (ES1: @1@ ES2: @2@)'.format(_with_opengl_string,
                                                    with_gles1 ? 'yes' : 'no',
                                                    with_gles2 ? 'yes' : 'no'),
]

lines += ''
if with_osmesa != 'none'
  suffix = ''
  if with_osmesa == 'gallium'
    suffix = '(Gallium)'
  endif
  lines += 'OSMesa:          lib' + osmesa_lib_name + suffix
else
  lines += 'OSMesa:          no'
endif

lines += ''
if with_dri
  lines += 'DRI platform:    ' + with_dri_platform
  if dri_drivers.length() != 0 and dri_drivers != ['']
    lines += 'DRI drivers:     ' + ' '.join(dri_drivers)
  else
    lines += 'DRI drivers:     no'
  endif
  lines += 'DRI driver dir:  ' + dri_drivers_path
endif

lines += ''
if with_glx != 'disabled'
  if with_glx == 'dri'
    lines += 'GLX:             DRI-based'
  elif with_glx == 'xlib'
    lines += 'GLX:             Xlib-based'
  elif with_glx == 'gallium-xlib'
    lines += 'GLX:             Xlib-based (Gallium)'
  else
    lines += 'GLX:             ' + with_glx
  endif
endif

lines += ''
lines += 'EGL:             ' + (with_egl ? 'yes' : 'no')
if with_egl
  egl_drivers = []
  if with_dri
    egl_drivers += 'builtin:egl_dri2'
  endif
  if with_dri3
    egl_drivers += 'builtin:egl_dri3'
  endif
  lines += 'EGL drivers:     ' + ' '.join(egl_drivers)
endif
lines += 'GBM:             ' + (with_gbm ? 'yes' : 'no')
if with_platforms
  lines += 'EGL/Vulkan/VL platforms:   ' + ' '.join(_platforms)
endif

lines += ''
if with_any_vk
  lines += 'Vulkan drivers:  ' + ' '.join(_vulkan_drivers)
  lines += 'Vulkan ICD dir:  ' + with_vulkan_icd_dir
else
  lines += 'Vulkan drivers:  no'
endif

lines += ''
if with_llvm
  lines += 'llvm:            yes'
  lines += 'llvm-version:    ' + dep_llvm.version()
else
  lines += 'llvm:            no'
endif

lines += ''
if with_gallium
  lines += 'Gallium drivers: ' + ' '.join(gallium_drivers)
  gallium_st = ['mesa']
  if with_gallium_xa
    gallium_st += 'xa'
  endif
  if with_gallium_xvmc
    gallium_st += 'xvmc'
  endif
  if with_gallium_xvmc
    gallium_st += 'xvmc'
  endif
  if with_gallium_vdpau
    gallium_st += 'vdpau'
  endif
  if with_gallium_omx != 'disabled'
    gallium_st += 'omx' + with_gallium_omx
  endif
  if with_gallium_va
    gallium_st += 'va'
  endif
  if with_gallium_st_nine
    gallium_st += 'nine'
  endif
  if with_gallium_opencl
    gallium_st += 'clover'
  endif
  lines += 'Gallium st:      ' + ' '.join(gallium_st)
else
  lines += 'Gallium:         no'
endif

lines += 'HUD lmsensors:   ' + (dep_lmsensors.found() ? 'yes' : 'no')

lines += ''
lines += 'Shared-glapi:    ' + (with_shared_glapi ? 'yes' : 'no')


indent = '        '
summary = indent + ('\n' + indent).join(lines)
message('Configuration summary:\n@0@\n'.format(summary))