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From: "hubicka at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug lto/65380] [5 Regression][ICF] LTO: ICE in add_symbol_to_partition_1, at lto/lto-partition.c:158
Date: Wed, 18 Mar 2015 02:32:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65380

--- Comment #10 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
Actually perhaps we manage to produce external alias of non-external symbol
that also should not happen.
Index: ipa-icf.c
===================================================================
--- ipa-icf.c   (revision 221461)
+++ ipa-icf.c   (working copy)
@@ -809,6 +809,15 @@ sem_function::merge (sem_item *alias_ite
   bool original_address_matters = original->address_matters_p ();
   bool alias_address_matters = alias->address_matters_p ();

+  if (DECL_EXTERNAL (alias->decl))
+    {
+      if (dump_file)
+       fprintf (dump_file,
+                "Not unifying; "
+                "alias is external.\n\n");
+      return false;
+    }
+
   if (DECL_NO_INLINE_WARNING_P (original->decl)
       != DECL_NO_INLINE_WARNING_P (alias->decl))
     {
@@ -1767,6 +1870,14 @@ sem_variable::merge (sem_item *alias_ite
                 "Symbol aliases are not supported by target\n\n");
       return false;
     }
+  if (DECL_EXTERNAL (alias->decl))
+    {
+      if (dump_file)
+       fprintf (dump_file,
+                "Not unifying; "
+                "alias is external.\n\n");
+      return false;
+    }

   sem_variable *alias_var = static_cast<sem_variable *> (alias_item);


May help.