egl: link with libgallium directly

Acked-by: Daniel Stone <daniels@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/29771>

src/egl/drivers/dri2/egl_dri2.c

@@ -644,17 +644,15 @@ static const struct dri_extension_match optional_core_extensions[] = {
    {__DRI_KOPPER, 1, offsetof(struct dri2_egl_display, kopper), true},
 };
 
+const __DRIextension **
+dri_loader_get_extensions(const char *driver_name);
+
 static const __DRIextension **
 dri2_open_driver(_EGLDisplay *disp)
 {
    struct dri2_egl_display *dri2_dpy = dri2_egl_display(disp);
-   static const char *search_path_vars[] = {
-      "LIBGL_DRIVERS_PATH",
-      NULL,
-   };
 
-   return loader_open_driver(dri2_dpy->driver_name, &dri2_dpy->driver,
-                             search_path_vars, disp->Options.FallbackZink);
+   return dri_loader_get_extensions(dri2_dpy->driver_name);
 }
 
 static EGLBoolean
@@ -666,13 +664,14 @@ dri2_load_driver_common(_EGLDisplay *disp,
    const __DRIextension **extensions;
 
    extensions = dri2_open_driver(disp);
-   if (!extensions)
+   if (!extensions) {
+      if (disp->Options.FallbackZink)
+         _eglLog(_LOADER_WARNING, "MESA-LOADER: failed to open %s: driver not built!)\n", dri2_dpy->driver_name);
       return EGL_FALSE;
+   }
 
    if (!loader_bind_extensions(dri2_dpy, driver_extensions, num_matches,
                                extensions)) {
-      dlclose(dri2_dpy->driver);
-      dri2_dpy->driver = NULL;
       return EGL_FALSE;
    }
    dri2_dpy->driver_extensions = extensions;
@@ -1137,14 +1136,6 @@ dri2_display_destroy(_EGLDisplay *disp)
    if (dri2_dpy->fd_render_gpu >= 0)
       close(dri2_dpy->fd_render_gpu);
 
-      /* Don't dlclose the driver when building with the address sanitizer, so
-       * you get good symbols from the leak reports.
-       */
-#if !BUILT_WITH_ASAN || defined(NDEBUG)
-   if (dri2_dpy->driver)
-      dlclose(dri2_dpy->driver);
-#endif
-
    free(dri2_dpy->driver_name);
 
 #ifdef HAVE_WAYLAND_PLATFORM

src/egl/drivers/dri2/egl_dri2.h

@@ -240,7 +240,6 @@ struct dri2_egl_display {
    __DRIscreen *dri_screen_display_gpu;
    bool own_dri_screen;
    const __DRIconfig **driver_configs;
-   void *driver;
    const __DRIcoreExtension *core;
    const __DRImesaCoreExtension *mesa;
    const __DRIimageDriverExtension *image_driver;

src/egl/drivers/dri2/platform_android.c

@@ -1012,8 +1012,6 @@ droid_unload_driver(_EGLDisplay *disp)
 {
    struct dri2_egl_display *dri2_dpy = dri2_egl_display(disp);
 
-   dlclose(dri2_dpy->driver);
-   dri2_dpy->driver = NULL;
    free(dri2_dpy->driver_name);
    dri2_dpy->driver_name = NULL;
 }

src/egl/meson.build

@@ -7,6 +7,12 @@ inc_egl_dri2 = include_directories('drivers/dri2')
 c_args_for_egl = [asan_c_args]
 cpp_args_for_egl = []
 link_for_egl = []
+if with_dri
+  link_for_egl += libgallium_dri
+endif
+if with_platform_windows
+  link_for_egl += libgallium_wgl
+endif
 deps_for_egl = []
 incs_for_egl = [inc_include, inc_src, inc_egl]
 
@@ -184,6 +190,7 @@ libegl = shared_library(
   link_args : [ld_args_bsymbolic, ld_args_gc_sections],
   dependencies : [deps_for_egl, dep_dl, dep_libdrm, dep_clock, dep_thread, idep_mesautil],
   install : true,
+  install_rpath : dri_drivers_path,
   version : egl_lib_version,
   soversion : egl_lib_soversion,
   name_prefix : host_machine.system() == 'windows' ? 'lib' : [],  # always use lib, but avoid warnings on !windows

src/gbm/meson.build

@@ -45,6 +45,7 @@ libgbm = shared_library(
   gnu_symbol_visibility : 'hidden',
   version : '1.0.0',
   install : true,
+  install_rpath : dri_drivers_path,
 )
 
 if with_tests