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>

meson.build

@@ -811,7 +811,7 @@ if with_gallium_rusticl or with_nouveau_vk or with_tools.contains('etnaviv')
   endif
 endif
 
-with_clc = with_microsoft_clc or with_intel_clc or with_gallium_asahi or with_asahi_vk or with_gallium_rusticl
+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

meson_options.txt

@@ -743,3 +743,20 @@ 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).'
+)

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

src/compiler/spirv/meson.build

@@ -77,12 +77,14 @@ spirv2nir = executable(
   install : with_tools.contains('nir'),
 )
 
+if get_option('mesa-clc') == 'system'
+  prog_vtn_bindgen = find_program('vtn_bindgen', native : true)
 # Due to the cross build issues in current meson, we only build vtn_bindgen when
-# building drivers that need it.
+# building drivers that need it or mesa-clc is explictly required.
 #
 # XXX: Build by default once https://github.com/mesonbuild/meson/pull/12022
 # ships.
-if with_gallium_asahi or with_asahi_vk
+elif get_option('mesa-clc') != 'auto' or with_gallium_asahi or with_asahi_vk
    prog_vtn_bindgen = executable(
      'vtn_bindgen',
      ['vtn_bindgen.c'],
@@ -93,6 +95,7 @@ if with_gallium_asahi or with_asahi_vk
      # 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