[Bug lto/60567] [4.9 Regression] lto1 ICE in add_symbol_to_partition, at lto/lto-partition.c:233 with -fno-use-linker-plugin

["jakub at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60567

--- Comment #13 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
--- gcc/symtab.c.jj    2014-03-21 22:23:43.000000000 +0100
+++ gcc/symtab.c    2014-04-09 17:37:40.709523997 +0200
@@ -1312,9 +1312,13 @@ symtab_get_symbol_partitioning_class (sy
   /* Linker discardable symbols are duplicated to every use unless they are
      keyed.
      Keyed symbols or those.  */
-  if (DECL_ONE_ONLY (node->decl)
+  if ((HAVE_LTO_PLUGIN
+       && (flag_use_linker_plugin
+       || (HAVE_LTO_PLUGIN == 2
+           && !global_options_set.x_flag_use_linker_plugin))
+       ? (DECL_ONE_ONLY (node->decl) && !node->forced_by_abi)
+       : DECL_COMDAT (node->decl))
       && !node->force_output
-      && !node->forced_by_abi
       && !symtab_used_from_object_file_p (node))
     return SYMBOL_DUPLICATE;


seems to make the ICE go away with -fno-use-linker-plugin or when the linker
doesn't support the plugin at all, didn't have to change ipa.c similarly.
But why is this happening and why this helps needs analyzing.