[Bug bootstrap/58340] [4.9 regression] gcc/cp/pt.c:7064:1: internal compiler error: in propagate_threaded_block_debug_into, at tree-ssa-threadedge.c:623

[hubicka at ucw dot cz]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58340

--- Comment #14 from Jan Hubicka <hubicka at ucw dot cz> ---
I use the following workaround for time being.

Honza

Index: tree-ssa-threadedge.c
===================================================================
--- tree-ssa-threadedge.c    (revision 202364)
+++ tree-ssa-threadedge.c    (working copy)
@@ -1015,8 +1015,9 @@ thread_across_edge (gimple dummy_cond,
         tmp = find_edge (taken_edge->src, path[path.length () - 1]->dest);
         if (!tmp || phi_args_equal_on_edges (tmp, path[path.length () - 1]))
           {
-        propagate_threaded_block_debug_into (path[path.length () - 1]->dest,
-                             taken_edge->dest);
+        if (path[path.length () - 1]->dest != taken_edge->dest)
+          propagate_threaded_block_debug_into (path[path.length () - 1]->dest,
+                               taken_edge->dest);
         register_jump_thread (path, true);
           }
       }