[Bug c++/94326] g++: error: pack.ii: ‘-fcompare-debug’ failure (length)

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94326

--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
--- gcc/cp/call.c.jj    2020-03-25 08:05:07.153731580 +0100
+++ gcc/cp/call.c       2020-03-26 15:03:42.432909693 +0100
@@ -333,11 +333,14 @@ set_flags_from_callee (tree call)
           && internal_fn_flags (CALL_EXPR_IFN (call)) & ECF_NOTHROW)
     nothrow = true;

-  if (!nothrow && at_function_scope_p () && cfun && cp_function_chain)
-    cp_function_chain->can_throw = 1;
+  if (cfun && cp_function_chain && !cp_unevaluated_operand)
+    {
+      if (!nothrow && at_function_scope_p ())
+       cp_function_chain->can_throw = 1;

-  if (decl && TREE_THIS_VOLATILE (decl) && cfun && cp_function_chain)
-    current_function_returns_abnormally = 1;
+      if (decl && TREE_THIS_VOLATILE (decl))
+       current_function_returns_abnormally = 1;
+    }

   TREE_NOTHROW (call) = nothrow;
 }

seems to work, but not sure if that is what we want.