WIP: Add always present image tag

Author: madsmtm

objc2/src/macros.rs

@@ -77,7 +77,10 @@ macro_rules! sel {
         fn objc_static_workaround() -> $crate::runtime::Sel {
             const X: &[u8] = $sel.as_bytes();
 
-            $crate::image_info();
+            #[link_section = "__DATA,__objc_imageinfo,regular,no_dead_strip"]
+            #[export_name = concat!("\x01L_OBJC_IMAGE_INFO_", $crate::__proc_macros::hash_idents!($($idents)+))]
+            #[used]
+            static _IMAGE_TAG: [u32; 2] = [0, 0];
 
             #[link_section = "__TEXT,__objc_methname,cstring_literals"]
             #[export_name = concat!("\x01L_OBJC_METH_VAR_NAME_", $crate::__proc_macros::hash_idents!($($idents)+))]