linkers: apple: fix shared module args

iOS should not use -undefined,dynamic_lookup; whereas macOS should revert from
-dynamiclib to -bundle, as was the case before commit cfb5a48 ("linkers: darwin:
do not use -bundle for shared_modules", 2025-03-24), because Postgres wants to
use -bundle_loader and that is only possible together with -bundle.

Co-authored-by: Russell Keith-Magee <russell@keith-magee.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

Author: 2 people

mesonbuild/linkers/linkers.py

@@ -811,10 +811,17 @@ def get_asneeded_args(self) -> T.List[str]:
         return self._apply_prefix('-dead_strip_dylibs')
 
     def get_allow_undefined_args(self) -> T.List[str]:
-        return self._apply_prefix('-undefined,dynamic_lookup')
+        # iOS doesn't allow undefined symbols when linking
+        if self.system == 'ios':
+            return []
+        else:
+            return self._apply_prefix('-undefined,dynamic_lookup')
 
     def get_std_shared_module_args(self, target: 'BuildTarget') -> T.List[str]:
-        return ['-dynamiclib'] + self._apply_prefix('-undefined,dynamic_lookup')
+        if self.system == 'ios':
+            return ['-dynamiclib']
+        else:
+            return ['-bundle'] + self.get_allow_undefined_args()
 
     def get_pie_args(self) -> T.List[str]:
         return []