https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82204
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jakub at gcc dot gnu.org
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
--- gcc/cp/decl2.c.jj 2018-06-29 09:38:17.788306397 +0200
+++ gcc/cp/decl2.c 2018-06-30 09:54:59.516868946 +0200
@@ -5312,6 +5312,20 @@ mark_used (tree decl, tsubst_flags_t com
if (DECL_ODR_USED (decl))
return true;
+ /* If decl is local extern, recurse into corresponding decl. */
+ if (cfun
+ && cp_function_chain
+ && cp_function_chain->extern_decl_map
+ && VAR_OR_FUNCTION_DECL_P (decl)
+ && DECL_EXTERNAL (decl))
+ {
+ struct cxx_int_tree_map *h, in;
+ in.uid = DECL_UID (decl);
+ h = cp_function_chain->extern_decl_map->find_with_hash (&in, in.uid);
+ if (h && !mark_used (h->to))
+ return false;
+ }
+
/* Normally, we can wait until instantiation-time to synthesize DECL.
However, if DECL is a static data member initialized with a constant
or a constexpr function, we need it right now because a reference to
that helps with PR3698 doesn't help here.
