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# Copyright © 2017-2018 Intel Corporation
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# 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.

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project(
  'mesa',
  ['c', 'cpp'],
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  version : run_command(
    [find_program('python', 'python2', 'python3'), 'bin/meson_get_version.py']
  ).stdout(),
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  license : 'MIT',
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  meson_version : '>= 0.44.1',
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  default_options : ['buildtype=debugoptimized', 'c_std=c99', 'cpp_std=c++11']
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)
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null_dep = dependency('', required : false)

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

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# 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',
  '-DVERSION="@0@"'.format(meson.project_version()),
  '-DPACKAGE_VERSION=VERSION',
  '-DPACKAGE_BUGREPORT="https://bugs.freedesktop.org/enter_bug.cgi?product=Mesa"',
]

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with_vulkan_icd_dir = get_option('vulkan-icd-dir')
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with_tests = get_option('build-tests')
with_valgrind = get_option('valgrind')
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with_libunwind = get_option('libunwind')
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with_asm = get_option('asm')
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with_osmesa = get_option('osmesa')
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with_swr_arches = get_option('swr-arches')
with_tools = get_option('tools')
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if with_tools.contains('all')
  with_tools = ['freedreno', 'glsl', 'intel', 'nir', 'nouveau']
endif
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if get_option('texture-float')
  pre_args += '-DTEXTURE_FLOAT_ENABLED'
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  warning('Floating-point texture enabled. Please consult docs/patents.txt and your lawyer before building mesa.')
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endif
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dri_drivers_path = get_option('dri-drivers-path')
if dri_drivers_path == ''
  dri_drivers_path = join_paths(get_option('libdir'), 'dri')
endif
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dri_search_path = get_option('dri-search-path')
if dri_search_path == ''
  dri_search_path = join_paths(get_option('prefix'), dri_drivers_path)
endif
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with_gles1 = get_option('gles1')
with_gles2 = get_option('gles2')
with_opengl = get_option('opengl')
with_any_opengl = with_opengl or with_gles1 or with_gles2
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# Only build shared_glapi if at least one OpenGL API is enabled
with_shared_glapi = get_option('shared-glapi') and with_any_opengl
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# shared-glapi is required if at least two OpenGL APIs are being built
if not with_shared_glapi
  if ((with_gles1 and with_gles2) or (with_gles1 and with_opengl)
      or (with_gles2 and with_opengl))
    error('shared-glapi required for building two or more of OpenGL, OpenGL ES 1.x, OpenGL ES 2.x')
  endif
endif

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

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

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_drivers = get_option('dri-drivers')
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if _drivers.contains('auto')
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  if system_has_kms_drm
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    # TODO: PPC, Sparc
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    if ['x86', 'x86_64'].contains(host_machine.cpu_family())
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      _drivers = ['i915', 'i965', 'r100', 'r200', 'nouveau']
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    elif ['arm', 'aarch64'].contains(host_machine.cpu_family())
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      _drivers = ['']
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    else
      error('Unknown architecture. Please pass -Ddri-drivers to set driver options. Patches gladly accepted to fix this.')
    endif
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  elif ['darwin', 'windows', 'cygwin', 'haiku'].contains(host_machine.system())
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    # only swrast would make sense here, but gallium swrast is a much better default
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    _drivers = ['']
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  else
    error('Unknown OS. Please pass -Ddri-drivers to set driver options. Patches gladly accepted to fix this.')
  endif
endif
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with_dri_i915 = _drivers.contains('i915')
with_dri_i965 = _drivers.contains('i965')
with_dri_r100 = _drivers.contains('r100')
with_dri_r200 = _drivers.contains('r200')
with_dri_nouveau = _drivers.contains('nouveau')
with_dri_swrast = _drivers.contains('swrast')

with_dri = _drivers.length() != 0 and _drivers != ['']
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_drivers = get_option('gallium-drivers')
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if _drivers.contains('auto')
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  if system_has_kms_drm
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    # TODO: PPC, Sparc
    if ['x86', 'x86_64'].contains(host_machine.cpu_family())
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      _drivers = [
        'r300', 'r600', 'radeonsi', 'nouveau', 'virgl', 'svga', 'swrast'
      ]
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    elif ['arm', 'aarch64'].contains(host_machine.cpu_family())
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      _drivers = [
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        'pl111', 'v3d', 'vc4', 'freedreno', 'etnaviv', 'imx', 'nouveau',
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        'tegra', 'virgl', 'swrast',
      ]
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    else
      error('Unknown architecture. Please pass -Dgallium-drivers to set driver options. Patches gladly accepted to fix this.')
    endif
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  elif ['darwin', 'windows', 'cygwin', 'haiku'].contains(host_machine.system())
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    _drivers = ['swrast']
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  else
    error('Unknown OS. Please pass -Dgallium-drivers to set driver options. Patches gladly accepted to fix this.')
  endif
endif
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with_gallium_pl111 = _drivers.contains('pl111')
with_gallium_radeonsi = _drivers.contains('radeonsi')
with_gallium_r300 = _drivers.contains('r300')
with_gallium_r600 = _drivers.contains('r600')
with_gallium_nouveau = _drivers.contains('nouveau')
with_gallium_freedreno = _drivers.contains('freedreno')
with_gallium_softpipe = _drivers.contains('swrast')
with_gallium_vc4 = _drivers.contains('vc4')
with_gallium_v3d = _drivers.contains('v3d')
with_gallium_etnaviv = _drivers.contains('etnaviv')
with_gallium_imx = _drivers.contains('imx')
with_gallium_tegra = _drivers.contains('tegra')
with_gallium_i915 = _drivers.contains('i915')
with_gallium_svga = _drivers.contains('svga')
with_gallium_virgl = _drivers.contains('virgl')
with_gallium_swr = _drivers.contains('swr')

with_gallium = _drivers.length() != 0 and _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
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  endif
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endif

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

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if with_dri_swrast and (with_gallium_softpipe or with_gallium_swr)
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  error('Only one swrast provider can be built')
endif
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if with_dri_i915 and with_gallium_i915
  error('Only one i915 provider can be built')
endif
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if with_gallium_imx and not with_gallium_etnaviv
  error('IMX driver requires etnaviv driver')
endif
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if with_gallium_pl111 and not with_gallium_vc4
  error('pl111 driver requires vc4 driver')
endif
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if with_gallium_tegra and not with_gallium_nouveau
  error('tegra driver requires nouveau driver')
endif
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if host_machine.system() == 'darwin'
  with_dri_platform = 'apple'
elif ['windows', 'cygwin'].contains(host_machine.system())
  with_dri_platform = 'windows'
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elif system_has_kms_drm
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  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: GNU (hurd) ends up here as well, but meson doesn't officially
  # support Hurd at time of writing (2017/11)
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  # FIXME: illumos ends up here as well
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  with_dri_platform = 'none'
endif
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with_platform_android = false
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with_platform_wayland = false
with_platform_x11 = false
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with_platform_drm = false
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with_platform_surfaceless = false
egl_native_platform = ''
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_platforms = get_option('platforms')
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if _platforms.contains('auto')
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  if system_has_kms_drm
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    _platforms = ['x11', 'wayland', 'drm', 'surfaceless']
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  elif ['darwin', 'windows', 'cygwin'].contains(host_machine.system())
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    _platforms = ['x11', 'surfaceless']
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  elif ['haiku'].contains(host_machine.system())
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    _platforms = ['haiku']
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  else
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    error('Unknown OS. Please pass -Dplatforms to set platforms. Patches gladly accepted to fix this.')
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  endif
endif
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if _platforms != ['']
  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')
  egl_native_platform = _platforms[0]
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endif

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with_glx = get_option('glx')
if with_glx == 'auto'
  if with_dri
    with_glx = 'dri'
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  elif with_platform_haiku
    with_glx = 'disabled'
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  elif with_gallium
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    # Even when building just gallium drivers the user probably wants dri
    with_glx = 'dri'
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    with_dri = true
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  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

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

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

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_egl = get_option('egl')
if _egl == 'auto'
  with_egl = with_dri and with_shared_glapi and egl_native_platform != ''
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elif _egl == 'true'
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  if not with_dri
    error('EGL requires dri')
  elif not with_shared_glapi
    error('EGL requires shared-glapi')
  elif egl_native_platform == ''
    error('No platforms specified, consider -Dplatforms=drm,x11 at least')
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  elif not ['disabled', 'dri'].contains(with_glx)
    error('EGL requires dri, but a GLX is being built without dri')
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  endif
  with_egl = true
else
  with_egl = false
endif

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

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

with_glvnd = get_option('glvnd')
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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
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endif

# TODO: toggle for this
with_glx_direct = true

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

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

if with_any_vk and (with_platform_x11 and not with_dri3)
  error('Vulkan drivers require dri3 for X11 support')
endif
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if with_dri or with_gallium
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  if with_glx == 'disabled' and not with_egl and not with_platform_haiku
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    error('building dri or gallium drivers require at least one window system')
  endif
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endif

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prog_pkgconfig = find_program('pkg-config')

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

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

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

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_omx = get_option('gallium-omx')
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if not system_has_kms_drm
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  if ['auto', 'disabled'].contains(_omx)
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    _omx = 'disabled'
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  else
    error('OMX state tracker can only be built on unix-like OSes.')
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  endif
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elif not (with_platform_x11 or with_platform_drm)
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  if ['auto', 'disabled'].contains(_omx)
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    _omx = 'disabled'
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  else
    error('OMX state tracker requires X11 or drm platform support.')
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  endif
elif not (with_gallium_r600 or with_gallium_radeonsi or with_gallium_nouveau)
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  if ['auto', 'disabled'].contains(_omx)
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    _omx = 'disabled'
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  else
    error('OMX state tracker requires at least one of the following gallium drivers: r600, radeonsi, nouveau.')
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  endif
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endif
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with_gallium_omx = _omx
dep_omx = null_dep
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dep_omx_other = []
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if ['auto', 'bellagio'].contains(_omx)
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  dep_omx = dependency(
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    'libomxil-bellagio', required : _omx == 'bellagio'
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  )
  if dep_omx.found()
    with_gallium_omx = 'bellagio'
  endif
endif
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if ['auto', 'tizonia'].contains(_omx)
  if with_dri and with_egl
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    dep_omx = dependency(
      'libtizonia', version : '>= 0.10.0',
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      required : _omx == 'tizonia',
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    )
    dep_omx_other = [
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      dependency('libtizplatform', required : _omx == 'tizonia'),
      dependency('tizilheaders', required : _omx == 'tizonia'),
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    ]
    if dep_omx.found() and dep_omx_other[0].found() and dep_omx_other[1].found()
      with_gallium_omx = 'tizonia'
    endif
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  elif _omx == 'tizonia'
    error('OMX-Tizonia state tracker requires dri and egl')
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  endif
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endif
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if _omx == 'auto'
  with_gallium_omx = 'disabled'
else
  with_gallium_omx = _omx
endif
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pre_args += [
  '-DENABLE_ST_OMX_BELLAGIO=' + (with_gallium_omx == 'bellagio' ? '1' : '0'),
  '-DENABLE_ST_OMX_TIZONIA=' + (with_gallium_omx == 'tizonia' ? '1' : '0'),
]


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omx_drivers_path = get_option('omx-libs-path')
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if with_gallium_omx != 'disabled'
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  # 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

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_va = get_option('gallium-va')
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if not system_has_kms_drm
  if _va == 'true'
    error('VA state tracker can only be built on unix-like OSes.')
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  else
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    _va = 'false'
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  endif
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elif not (with_platform_x11 or with_platform_drm)
  if _va == 'true'
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    error('VA state tracker requires X11 or drm or wayland platform support.')
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  else
    _va = 'false'
  endif
elif not (with_gallium_r600 or with_gallium_radeonsi or with_gallium_nouveau)
  if _va == 'true'
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    error('VA state tracker requires at least one of the following gallium drivers: r600, radeonsi, nouveau.')
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  else
    _va = 'false'
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  endif
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elif _va == 'auto'
  _va = 'true'
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endif
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with_gallium_va = _va == 'true'
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dep_va = null_dep
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if with_gallium_va
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  dep_va = dependency('libva', version : '>= 0.39.0')
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  dep_va_headers = declare_dependency(
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    compile_args : run_command(prog_pkgconfig, ['libva', '--cflags']).stdout().split()
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  )
endif

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

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_xa = get_option('gallium-xa')
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if not system_has_kms_drm
  if _xa == 'true'
    error('XA state tracker can only be built on unix-like OSes.')
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  else
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    _xa = 'false'
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  endif
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elif not (with_gallium_nouveau or with_gallium_freedreno or with_gallium_i915
          or with_gallium_svga)
  if _xa == 'true'
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    error('XA state tracker requires at least one of the following gallium drivers: nouveau, freedreno, i915, svga.')
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  else
    _xa = 'false'
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  endif
endif
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with_gallium_xa = _xa != 'false'
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d3d_drivers_path = get_option('d3d-drivers-path')
if d3d_drivers_path == ''
  d3d_drivers_path = join_paths(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)
    error('The nine state tracker requires at least on non-swrast gallium driver.')
  endif
  if not with_dri3
    error('Using nine with wine requires dri3')
  endif
endif

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

  # TODO: alitvec?
  dep_clc = dependency('libclc')
  with_gallium_opencl = true
  with_opencl_icd = _opencl == 'icd'
else
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  dep_clc = null_dep
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  with_gallium_opencl = false
  with_gallium_icd = false
endif

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gl_pkgconfig_c_flags = []
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if with_platform_x11
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  if with_any_vk or with_egl or (with_glx == 'dri' and with_dri_platform == 'drm')
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    pre_args += '-DHAVE_X11_PLATFORM'
  endif
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  if with_glx == 'xlib' or with_glx == 'gallium-xlib'
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    pre_args += '-DUSE_XSHM'
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  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'
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    elif with_dri_platform == 'apple'
      pre_args += '-DGLX_USE_APPLEGL'
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    elif with_dri_platform == 'windows'
      pre_args += '-DGLX_USE_WINDOWSGL'
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    endif
  endif
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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'
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endif
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if with_platform_android
  dep_android = [
    dependency('cutils'),
    dependency('hardware'),
    dependency('sync'),
  ]
  pre_args += '-DHAVE_ANDROID_PLATFORM'
endif
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if with_platform_haiku
  pre_args += '-DHAVE_HAIKU_PLATFORM'
endif
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prog_python2 = find_program('python2')
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has_mako = run_command(prog_python2, '-c', 'import mako')
if has_mako.returncode() != 0
  error('Python (2.x) mako module required to build mesa.')
endif
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cc = meson.get_compiler('c')
if cc.get_id() == 'gcc' and cc.version().version_compare('< 4.4.6')
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  error('When using GCC, version 4.4.6 or later is required.')
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endif

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

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if get_option('shader-cache')
  pre_args += '-DENABLE_SHADER_CACHE'
elif with_amd_vk
  error('Radv requires shader cache support')
endif

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# 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

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# check for GCC __attribute__
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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))')
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  pre_args += '-DHAVE_FUNC_ATTRIBUTE_RETURNS_NONNULL'
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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(...)))')
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  pre_args += '-DHAVE_FUNC_ATTRIBUTE_VISIBILITY'
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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
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if cc.compiles('int foo(void) __attribute__((__noreturn__));',
               name : '__attribute__((__noreturn__))')
  pre_args += '-DHAVE_FUNC_ATTRIBUTE_NORETURN'
endif
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# TODO: this is very incomplete
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if ['linux', 'cygwin'].contains(host_machine.system())
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  pre_args += '-D_GNU_SOURCE'
endif

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# Check for generic C arguments
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c_args = []
foreach a : ['-Wall', '-Werror=implicit-function-declaration',
             '-Werror=missing-prototypes', '-fno-math-errno',
             '-fno-trapping-math', '-Qunused-arguments']
  if cc.has_argument(a)
    c_args += a
  endif
endforeach
c_vis_args = []
if cc.has_argument('-fvisibility=hidden')
  c_vis_args += '-fvisibility=hidden'
endif

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# Check for generic C++ arguments
cpp = meson.get_compiler('cpp')
cpp_args = []
foreach a : ['-Wall', '-fno-math-errno', '-fno-trapping-math',
             '-Qunused-arguments']
  if cpp.has_argument(a)
    cpp_args += a
  endif
endforeach

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# For some reason, the test for -Wno-foo always succeeds with gcc, even if the
# option is not supported. Hence, check for -Wfoo instead.
if cpp.has_argument('-Wnon-virtual-dtor')
  cpp_args += '-Wno-non-virtual-dtor'
endif

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

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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

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if host_machine.cpu_family().startswith('x86')
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  pre_args += '-DUSE_SSE41'
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  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
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# Check for GCC style atomics
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dep_atomic = null_dep
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if cc.compiles('int main() { int n; return __atomic_load_n(&n, __ATOMIC_ACQUIRE); }',
               name : 'GCC atomic builtins')
  pre_args += '-DUSE_GCC_ATOMIC_BUILTINS'
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  # 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() {
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                       struct {
                         uint64_t *v;
                       } x;
                       return (int)__atomic_load_n(x.v, __ATOMIC_ACQUIRE);
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                     }''',
                  name : 'GCC atomic builtins required -latomic')
    dep_atomic = cc.find_library('atomic')
  endif
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endif
if not cc.links('''#include <stdint.h>
                   uint64_t v;
                   int main() {
                     return __sync_add_and_fetch(&v, (uint64_t)1);
                   }''',
                name : 'GCC 64bit atomics')
  pre_args += '-DMISSING_64_BIT_ATOMICS'
endif

# TODO: endian
# TODO: powr8
# TODO: shared/static? Is this even worth doing?

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# Building x86 assembly code requires running x86 binaries. It is possible for
# x86_64 OSes to run x86 binaries, so don't disable asm in those cases
# TODO: it should be possible to use an exe_wrapper to run the binary during
# the build. 
if meson.is_cross_build() 
  if not (build_machine.cpu_family() == 'x86_64' and host_machine.cpu_family() == 'x86'
          and build_machine.system() == host_machine.system())
    message('Cross compiling to x86 from non-x86, disabling asm')
    with_asm = false
  endif
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endif

with_asm_arch = ''
if with_asm
  # TODO: SPARC and PPC
  if host_machine.cpu_family() == 'x86'
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    if system_has_kms_drm
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      with_asm_arch = 'x86'
      pre_args += ['-DUSE_X86_ASM', '-DUSE_MMX_ASM', '-DUSE_3DNOW_ASM',
                   '-DUSE_SSE_ASM']
    endif
  elif host_machine.cpu_family() == 'x86_64'
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    if system_has_kms_drm
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      with_asm_arch = 'x86_64'
      pre_args += ['-DUSE_X86_64_ASM']
    endif
  elif host_machine.cpu_family() == 'arm'
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    if system_has_kms_drm
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      with_asm_arch = 'arm'
      pre_args += ['-DUSE_ARM_ASM']
    endif
  elif host_machine.cpu_family() == 'aarch64'
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    if system_has_kms_drm
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      with_asm_arch = 'aarch64'
      pre_args += ['-DUSE_AARCH64_ASM']
    endif
  endif
endif
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# 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

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

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foreach f : ['strtof', 'mkostemp', 'posix_memalign', 'timespec_get', 'memfd_create']
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  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);
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      float f = strtof_l(s, end, loc);
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      freelocale(loc);
      return 0;
    }''',
    extra_args : pre_args,
    name : 'strtod has locale support')
  pre_args += '-DHAVE_STRTOD_L'
endif

# Check for some linker flags
ld_args_bsymbolic = []
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if cc.links('int main() { return 0; }', args : '-Wl,-Bsymbolic', name : 'Bsymbolic')
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  ld_args_bsymbolic += '-Wl,-Bsymbolic'
endif
ld_args_gc_sections = []
if cc.links('static char unused() { return 5; } int main() { return 0; }',
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            args : '-Wl,--gc-sections', name : 'gc-sections')
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  ld_args_gc_sections += '-Wl,--gc-sections'
endif
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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
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ld_args_build_id = []
if build_machine.system() != 'darwin'
   ld_args_build_id += '-Wl,--build-id=sha1'
endif
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# check for dl support
if cc.has_function('dlopen')
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  dep_dl = null_dep
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else
  dep_dl = cc.find_library('dl')
endif
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if cc.has_function('dladdr', dependencies : dep_dl)
  # This is really only required for megadrivers
  pre_args += '-DHAVE_DLADDR'
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endif

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

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

# TODO: some of these may be conditional
dep_zlib = dependency('zlib', version : '>= 1.2.3')
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pre_args += '-DHAVE_ZLIB'
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dep_thread = dependency('threads')
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if dep_thread.found() and host_machine.system() != 'windows'
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  pre_args += '-DHAVE_PTHREAD'
endif
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if with_amd_vk or with_gallium_radeonsi or with_gallium_r600 or with_gallium_opencl
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  dep_elf = dependency('libelf', required : false)
  if not dep_elf.found()
    dep_elf = cc.find_library('elf')
  endif
else
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  dep_elf = null_dep
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endif
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dep_expat = dependency('expat')
# this only exists on linux so either this is linux and it will be found, or
# its not linux and and wont
dep_m = cc.find_library('m', required : false)
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# 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
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dep_libdrm_amdgpu = null_dep
dep_libdrm_radeon = null_dep
dep_libdrm_nouveau = null_dep
dep_libdrm_etnaviv = null_dep
dep_libdrm_freedreno = null_dep
dep_libdrm_intel = null_dep
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_drm_amdgpu_ver = '2.4.91'
_drm_radeon_ver = '2.4.71'
_drm_nouveau_ver = '2.4.66'
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_drm_etnaviv_ver = '2.4.89'
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_drm_freedreno_ver = '2.4.92'
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_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)],
  ['etnaviv', with_gallium_etnaviv],
  ['freedreno', with_gallium_freedreno],
]

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

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# Loop over the enables versions and get the highest libdrm requirement for all
# active drivers.
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
  endif
endforeach

# Then get each libdrm module
foreach d : _libdrm_checks
  if d[1]
    set_variable(
      'dep_libdrm_' + d[0],
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      dependency('libdrm_' + d[0], version : '>=' + _drm_ver)
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    )
  endif
endforeach
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with_gallium_drisw_kms = false
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dep_libdrm = dependency(
  'libdrm', version : '>=' + _drm_ver,
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  required : with_dri2 or with_dri3
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)
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if dep_libdrm.found()
  pre_args += '-DHAVE_LIBDRM'
  if with_dri_platform == 'drm' and with_dri
    with_gallium_drisw_kms = true
  endif
endif

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llvm_modules = ['bitwriter', 'engine', 'mcdisassembler', 'mcjit']
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if with_amd_vk or with_gallium_radeonsi or with_gallium_r600
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  llvm_modules += ['amdgpu', 'bitreader', 'ipo']
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  if with_gallium_r600
    llvm_modules += 'asmparser'
  endif
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endif
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if with_gallium_opencl
  llvm_modules += [
    'all-targets', 'linker', 'coverage', 'instrumentation', 'ipo', 'irreader',
    'lto', 'option', 'objcarcopts', 'profiledata',
  ]
  # TODO: optional modules
endif
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if with_amd_vk or with_gallium_radeonsi
  _llvm_version = '>= 5.0.0'
elif with_gallium_swr
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  _llvm_version = '>= 4.0.0'
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elif with_gallium_opencl or with_gallium_r600
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  _llvm_version = '>= 3.9.0'
else
  _llvm_version = '>= 3.3.0'
endif

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_llvm = get_option('llvm')
if _llvm == 'auto'