https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79671
--- Comment #98 from Bernd Edlinger <bernd.edlinger at hotmail dot de> ---
I realized that my latest patch triggers a pre-existing
bug in the libstdc++ testsuite => PR80287
So the following patch would be needed on top of it:
Index: gcc/cp/class.c
===================================================================
--- gcc/cp/class.c (revision 246605)
+++ gcc/cp/class.c (working copy)
@@ -2060,12 +2060,14 @@
static void
fixup_may_alias (tree klass)
{
- tree t;
+ tree t, v;
for (t = TYPE_POINTER_TO (klass); t; t = TYPE_NEXT_PTR_TO (t))
- TYPE_REF_CAN_ALIAS_ALL (t) = true;
+ for (v = TYPE_MAIN_VARIANT (t); v; v = TYPE_NEXT_VARIANT (v))
+ TYPE_REF_CAN_ALIAS_ALL (v) = true;
for (t = TYPE_REFERENCE_TO (klass); t; t = TYPE_NEXT_REF_TO (t))
- TYPE_REF_CAN_ALIAS_ALL (t) = true;
+ for (v = TYPE_MAIN_VARIANT (t); v; v = TYPE_NEXT_VARIANT (v))
+ TYPE_REF_CAN_ALIAS_ALL (v) = true;
}
/* Early variant fixups: we apply attributes at the beginning of the class
