mesa: fix cross compilation (#369171)

commit f063e9f74b45f34e4ac570a90901253bf8e64efd

Author: Mary Guillemard <mary.guillemard@collabora.com>

Date:   2024-12-02 09:11:35 +0100

    meson: Add mesa-clc and install-mesa-clc options

    Due to the cross build issues in current meson, we adds new options to

    allow mesa_clc and vtn_bindgen to be installed or searched on the

    system.

    Signed-off-by: Mary Guillemard <mary.guillemard@collabora.com>

    Reviewed-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>

    Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>

    Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/32719>

diff --git a/meson.build b/meson.build

index de9c9af53a1..e37325ec176 100644

--- a/meson.build

+++ b/meson.build

@@ -808,7 +808,7 @@ if with_gallium_rusticl or with_nouveau_vk or with_tools.contains('etnaviv')

 endif

 with_clover_spirv = with_gallium_clover and get_option('opencl-spirv')

-with_clc = with_microsoft_clc or with_intel_clc or with_gallium_asahi or with_asahi_vk or with_gallium_rusticl or with_clover_spirv

+with_clc = get_option('mesa-clc') != 'auto' or with_microsoft_clc or with_intel_clc or with_gallium_asahi or with_asahi_vk or with_gallium_rusticl

 dep_clc = null_dep

 if with_gallium_clover or with_clc

diff --git a/meson_options.txt b/meson_options.txt

index 79ee65e6094..8f22b36e5fb 100644

--- a/meson_options.txt

+++ b/meson_options.txt

@@ -744,3 +744,20 @@ option(

     'none', 'dri2'

   ],

 )

+

+option(

+  'mesa-clc',

+  type : 'combo',

+  value : 'auto',

+  choices : [

+    'enabled', 'system', 'auto'

+  ],

+  description : 'Build the mesa-clc compiler or use a system version.'

+)

+

+option(

+  'install-mesa-clc',

+  type : 'boolean',

+  value : false,

+  description : 'Install the mesa-clc compiler (if needed for cross builds).'

+)

diff --git a/src/compiler/clc/meson.build b/src/compiler/clc/meson.build

index 74767d08de2..4875d71ca21 100644

--- a/src/compiler/clc/meson.build

+++ b/src/compiler/clc/meson.build

@@ -117,15 +117,20 @@ idep_mesaclc = declare_dependency(

   link_args : _idep_mesaclc_link_args,

 )

-prog_mesa_clc = executable(

-  'mesa_clc',

-  ['mesa_clc.c'],

-  include_directories : [inc_include, inc_src],

-  c_args : [pre_args, no_override_init_args],

-  link_args : [ld_args_build_id],

-  dependencies : [idep_mesaclc, dep_llvm, dep_spirv_tools, idep_getopt],

-  # If we can run host binaries directly, just build mesa_clc for the host.

-  # Most commonly this happens when doing a cross compile from an x86_64 build

-  # machine to an x86 host

-  native : not meson.can_run_host_binaries(),

-)

+if get_option('mesa-clc') == 'system'

+  prog_mesa_clc = find_program('mesa_clc', native : true)

+else

+  prog_mesa_clc = executable(

+    'mesa_clc',

+    ['mesa_clc.c'],

+    include_directories : [inc_include, inc_src],

+    c_args : [pre_args, no_override_init_args],

+    link_args : [ld_args_build_id],

+    dependencies : [idep_mesaclc, dep_llvm, dep_spirv_tools, idep_getopt],

+    # If we can run host binaries directly, just build mesa_clc for the host.

+    # Most commonly this happens when doing a cross compile from an x86_64 build

+    # machine to an x86 host

+    native : not meson.can_run_host_binaries(),

+    install : get_option('install-mesa-clc'),

+  )

+endif

  patches = [

    ./opencl.patch

    # cherry-picked from https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/32719

    # safe to remove for versions > 24.3.2

    ./cross_clc.patch

  ];

  postPatch = ''

    # Enable Intel RT stuff when available

    (lib.mesonBool "install-intel-clc" true)

    (lib.mesonBool "install-mesa-clc" true)

    (lib.mesonEnable "intel-rt" stdenv.hostPlatform.isx86_64)

    (lib.mesonOption "clang-libdir" "${lib.getLib llvmPackages.clang-unwrapped}/lib")

    (lib.mesonOption "video-codecs" "all")

  ] ++ lib.optionals needNativeCLC [

    (lib.mesonOption "intel-clc" "system")

    (lib.mesonOption "mesa-clc" "system")

  ];

  strictDeps = true;

    echo $opencl/lib/libRusticlOpenCL.so > $opencl/etc/OpenCL/vendors/rusticl.icd

    moveToOutput bin/intel_clc $driversdev

    moveToOutput bin/mesa_clc $driversdev

    moveToOutput lib/gallium-pipe $opencl

    moveToOutput "lib/lib*OpenCL*" $opencl

    moveToOutput "lib/libOSMesa*" $osmesa