meson: Add support for configuring dri drivers directory.

v2: - drop with_ from dri_drivers_path variable (Eric A)
v3: - Move HAVE_X11_PLATFORM to the proper patch (Eric A)

Signed-off-by: Dylan Baker <dylanx.c.baker@intel.com>
Reviewed-by: Eric Anholt <eric@anholt.net>

meson.build

@@ -42,6 +42,11 @@ with_asm = get_option('asm')
 with_appledri = false
 with_windowsdri = false
 
+dri_drivers_path = get_option('dri-drivers-path')
+if dri_drivers_path == ''
+  dri_drivers_path = join_paths(get_option('libdir'), 'dri')
+endif
+
 with_gles1 = get_option('gles1')
 with_gles2 = get_option('gles2')
 with_opengl = get_option('opengl')

meson_options.txt

@@ -24,6 +24,8 @@ option('dri3', type : 'combo', value : 'auto', choices : ['auto', 'yes', 'no'],
        description : 'enable support for dri3')
 option('dri-drivers', type : 'string', value : 'i965',
        description : 'comma separated list of dri drivers to build.')
+option('dri-drivers-path', type : 'string', value : '',
+       description : 'Location of dri drivers. Default: $libdir/dri.')
 option('vulkan-drivers', type : 'string', value : 'intel,amd',
        description : 'comma separated list of vulkan drivers to build.')
 option('shader-cache', type : 'boolean', value : true,

src/glx/meson.build

@@ -106,7 +106,7 @@ elif with_windowsdri
   #]
 endif
 
-dri_driver_dir = join_paths(get_option('prefix'), get_option('libdir'), 'dri')
+dri_driver_dir = join_paths(get_option('prefix'), dri_drivers_path)
 if not with_glvnd
   gl_lib_name = 'GL'
   gl_lib_version = '1.2.0'

src/mesa/drivers/dri/meson.build

@@ -49,7 +49,7 @@ if with_dri
   meson.add_install_script(
     join_paths(meson.source_root(), 'bin/install_megadrivers.py'),
     libmesa_dri_drivers.full_path(),
-    join_paths(get_option('libdir'), 'dri'),
+    dri_drivers_path,
     dri_link,
   )
 endif