[committed 07/12] d: Set COMDAT and visibility of thunks only if they are public.

[Iain Buclaw via Gcc-patches]

It is not expected to have a member function that can be non-public, but
this guards against any internal errors that might occur should that
ever change in the front-end.

gcc/d/ChangeLog:

        * decl.cc (make_thunk): Set COMDAT and visibility of thunks only if
        they are public.
---
 gcc/d/decl.cc | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/gcc/d/decl.cc b/gcc/d/decl.cc
index 59991c3c255..cf61cd49159 100644
--- a/gcc/d/decl.cc
+++ b/gcc/d/decl.cc
@@ -1781,9 +1781,12 @@ make_thunk (FuncDeclaration *decl, int offset)
   DECL_ARTIFICIAL (thunk) = 1;
   DECL_DECLARED_INLINE_P (thunk) = 0;
 
-  DECL_VISIBILITY (thunk) = DECL_VISIBILITY (function);
-  DECL_COMDAT (thunk) = DECL_COMDAT (function);
-  DECL_WEAK (thunk) = DECL_WEAK (function);
+  if (TREE_PUBLIC (thunk))
+    {
+      DECL_VISIBILITY (thunk) = DECL_VISIBILITY (function);
+      DECL_COMDAT (thunk) = DECL_COMDAT (function);
+      DECL_WEAK (thunk) = DECL_WEAK (function);
+    }
 
   /* When the thunk is for an extern C++ function, let C++ do the thunk
      generation and just reference the symbol as extern, instead of
-- 
2.30.2