[glib: 1/2] giomodule: Automatically detect modules on macOS

[Philip Withnall <pwithnall src gnome org>]

commit af83c6571e47d06468b8162dd29ad57bcf4967a8
Author: Piotr Brzeziński <piotr centricular com>
Date:   Tue Aug 9 10:42:39 2022 +0200

    giomodule: Automatically detect modules on macOS
    
    Makes use of relocatable prefixes, allowing gio to find modules
    automatically without needing to set the GIO_EXTRA_MODULES env var.

 gio/giomodule.c | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)
---
diff --git a/gio/giomodule.c b/gio/giomodule.c
index f5dbb4555f..fce60e9fc5 100644
--- a/gio/giomodule.c
+++ b/gio/giomodule.c
@@ -1262,6 +1262,29 @@ get_gio_module_dir (void)
       g_free (install_dir);
 #else
       module_dir = g_strdup (GIO_MODULE_DIR);
+#ifdef __APPLE__
+#include "TargetConditionals.h"
+#if TARGET_OS_OSX
+#include <dlfcn.h>
+      {
+        g_autofree gchar *path = NULL;
+        g_autofree gchar *possible_dir = NULL;
+        Dl_info info;
+
+        if (dladdr (get_gio_module_dir, &info))
+          {
+            /* Gets path to the PREFIX/lib directory */
+            path = g_path_get_dirname (info.dli_fname);
+            possible_dir = g_build_filename (path, "gio", "modules", NULL);
+            if (g_file_test (possible_dir, G_FILE_TEST_IS_DIR))
+              {
+                g_free (module_dir);
+                module_dir = g_steal_pointer (&possible_dir);
+              }
+          }
+      }
+#endif
+#endif
 #endif
     }