Looking at this PR again, seems we have reached conclusion that the way forward
for GCC 6 is to temporarily disable the check, so I'm posting a patch for that,
so as to finally resolve this PR. The problem is that the C++ FE violates the
check when it sets FUNCTION_*_QUALIFIED flags.
Bootstrapped/regtested on x86_64-linux, ok for trunk?
2016-04-14 Marek Polacek <pola...@redhat.com>
Jan Hubicka <hubi...@ucw.cz>
PR c++/70029
* tree.c (verify_type): Disable the canonical type of main variant
check.
* g++.dg/torture/pr70029.C: New test.
diff --git gcc/testsuite/g++.dg/torture/pr70029.C
gcc/testsuite/g++.dg/torture/pr70029.C
index e69de29..9592f0c 100644
--- gcc/testsuite/g++.dg/torture/pr70029.C
+++ gcc/testsuite/g++.dg/torture/pr70029.C
@@ -0,0 +1,12 @@
+// PR c++/70029
+// { dg-do compile }
+// { dg-options "-std=c++11 -g -flto" }
+// { dg-require-effective-target lto }
+
+struct A
+{
+ A();
+ int foo() && __attribute__ ((__warn_unused_result__)) { return 0; }
+};
+
+A a;
diff --git gcc/tree.c gcc/tree.c
index ed28429..c64d720 100644
--- gcc/tree.c
+++ gcc/tree.c
@@ -13584,7 +13584,9 @@ verify_type (const_tree t)
debug_tree (ct);
error_found = true;
}
- if (TYPE_MAIN_VARIANT (t) == t && ct && TYPE_MAIN_VARIANT (ct) != ct)
+ /* FIXME: this is violated by the C++ FE as discussed in PR70029, when
+ FUNCTION_*_QUALIFIED flags are set. */
+ if (0 && TYPE_MAIN_VARIANT (t) == t && ct && TYPE_MAIN_VARIANT (ct) != ct)
{
error ("TYPE_CANONICAL of main variant is not main variant");
debug_tree (ct);
Marek
