[gobject-introspection] gitypelib.c: on macOS, treat @-prefixed shlib paths as absolute

[Emmanuele Bassi <ebassi src gnome org>]

commit 56df7b0f007fe260b2bd26ef9cc331ad73022700
Author: Rok Mandeljc <rok mandeljc gmail com>
Date:   Sat Nov 27 20:05:32 2021 +0100

    gitypelib.c: on macOS, treat @-prefixed shlib paths as absolute
    
    On macOS, @-prefixed shlib paths (@rpath, @executable_path, and
    @loader_path) need to be treated as absolute. Trying to combine them
    with a configured library path produces a mangled path that is
    unresolvable and may cause unintended side effects (such as loading
    the library from a fall-back location on macOS 12.0.1).

 girepository/gitypelib.c | 10 ++++++++++
 1 file changed, 10 insertions(+)
---
diff --git a/girepository/gitypelib.c b/girepository/gitypelib.c
index 904dff45..d5ef4506 100644
--- a/girepository/gitypelib.c
+++ b/girepository/gitypelib.c
@@ -2262,7 +2262,17 @@ load_one_shared_library (const char *shlib)
   GSList *p;
   GModule *m;
 
+#ifdef __APPLE__
+  /* On macOS, @-prefixed shlib paths (@rpath, @executable_path, @loader_path)
+     need to be treated as absolute; trying to combine them with a
+     configured library path produces a mangled path that is unresolvable
+     and may cause unintended side effects (such as loading the library
+     from a fall-back location on macOS 12.0.1).
+  */
+  if (!g_path_is_absolute (shlib) && !g_str_has_prefix (shlib, "@"))
+#else
   if (!g_path_is_absolute (shlib))
+#endif
     {
       /* First try in configured library paths */
       for (p = library_paths; p; p = p->next)