[gcc r11-11337] Objective-C, NeXT: Adjust symbol marking to match host tools.

[Iain D Sandoe <iains@gcc.gnu.org>]

https://gcc.gnu.org/g:49c3c423218ea5f02dbbc6b847e15c06174f81ba

commit r11-11337-g49c3c423218ea5f02dbbc6b847e15c06174f81ba
Author: Iain Sandoe <iain@sandoe.co.uk>
Date:   Mon May 2 19:42:49 2022 +0100

    Objective-C, NeXT: Adjust symbol marking to match host tools.
    
    Current host tools mark some additional symbols as 'no dead strip' and also
    expose one additional group to the linker.  This does not affect older Darwin
    versions or x86_64, but omitting these changes results in link errors for
    aarch64.
    
    Signed-off-by: Iain Sandoe <iain@sandoe.co.uk>
    
    gcc/ChangeLog:
    
            * config/darwin.c (darwin_label_is_anonymous_local_objc_name): Make
            protocol class methods linker-visible.
    
    gcc/objc/ChangeLog:
    
            * objc-next-runtime-abi-02.c (next_runtime_abi_02_protocol_decl): Do
            not dead-strip the runtime meta-data symbols.
            (build_v2_classrefs_table): Likewise.
            (build_v2_protocol_list_address_table): Likewise.
    
    (cherry picked from commit ecd5727c0a662a8fea6b5f8eac6f3f15bf5ef851)

Diff:
---
 gcc/config/darwin.c                 | 2 ++
 gcc/objc/objc-next-runtime-abi-02.c | 6 ++++--
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/gcc/config/darwin.c b/gcc/config/darwin.c
index b79c0d1d2b4..dedf84d6247 100644
--- a/gcc/config/darwin.c
+++ b/gcc/config/darwin.c
@@ -1933,6 +1933,8 @@ darwin_label_is_anonymous_local_objc_name (const char *name)
     }
   else if (!strncmp ((const char *)p, "ClassMethods", 12))
     return false;
+  else if (!strncmp ((const char *)p, "ClassProtocols", 14))
+    return false;
   else if (!strncmp ((const char *)p, "Instance", 8))
     {
       if (p[8] == 'I' || p[8] == 'M')
diff --git a/gcc/objc/objc-next-runtime-abi-02.c b/gcc/objc/objc-next-runtime-abi-02.c
index 19f137c632e..f1c858b2cd7 100644
--- a/gcc/objc/objc-next-runtime-abi-02.c
+++ b/gcc/objc/objc-next-runtime-abi-02.c
@@ -1035,6 +1035,7 @@ next_runtime_abi_02_protocol_decl (tree p)
   else
     decl = start_var_decl (objc_v2_protocol_template, buf);
   OBJCMETA (decl, objc_meta, meta_protocol);
+  DECL_PRESERVE_P (decl) = 1;
   return decl;
 }
 
@@ -2124,8 +2125,8 @@ build_v2_classrefs_table (void)
 	  expr = convert (objc_class_type, build_fold_addr_expr (expr));
 	}
       /* The runtime wants this, even if it appears unused, so we must force the
-	 output.
-      DECL_PRESERVE_P (decl) = 1; */
+	 output.  */
+      DECL_PRESERVE_P (decl) = 1;
       finish_var_decl (decl, expr);
     }
 }
@@ -2327,6 +2328,7 @@ build_v2_protocol_list_address_table (void)
       expr = convert (objc_protocol_type, build_fold_addr_expr (ref->refdecl));
       OBJCMETA (decl, objc_meta, meta_label_protocollist);
       finish_var_decl (decl, expr);
+      DECL_PRESERVE_P (decl) = 1;
     }
 
     /* TODO: delete the vec.  */