[Bug c++/88122] [9 Regression] g++ ICE: internal compiler error: Segmentation fault

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88122

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2018-11-21
                 CC|                            |jason at gcc dot gnu.org
     Ever confirmed|0                           |1

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
This ICEs in maybe_explain_implicit_delete.
If the computation of const_p is correct (and it is ok we often compute it e.g.
from parm_type that is void_type for the argument termination), then
--- cp/method.c.jj      2018-11-16 10:22:18.668258171 +0100
+++ cp/method.c 2018-11-21 15:42:08.441785625 +0100
@@ -1821,8 +1821,12 @@ maybe_explain_implicit_delete (tree decl
       if (!informed)
        {
          tree parms = FUNCTION_FIRST_USER_PARMTYPE (decl);
-         tree parm_type = TREE_VALUE (parms);
-         bool const_p = CP_TYPE_CONST_P (non_reference (parm_type));
+         bool const_p = false;
+         if (parms)
+           {
+             tree parm_type = TREE_VALUE (parms);
+             const_p = CP_TYPE_CONST_P (non_reference (parm_type));
+           }
          tree raises = NULL_TREE;
          bool deleted_p = false;
          tree scope = push_scope (ctype);
will do the job.  But I somehow think that const_p should be rather computed
from the this parameter if any, though of course that is just a wild guess.
Jason?