OK.
On Mon, Aug 29, 2016 at 3:37 PM, Jakub Jelinek <ja...@redhat.com> wrote:
> Hi!
>
> The following testcase fails (foo is allocated in .rodata and modified)
> because while we clear TREE_READONLY for classes with mutable members, we
> don't do that if they only have bases with mutable members.
>
> Fixed thusly, bootstrapped/regtested on x86_64-linux and i686-linux. Ok for
> trunk? What about release branches?
>
> 2016-08-29 Jakub Jelinek <ja...@redhat.com>
>
> PR c++/77375
> * class.c (check_bases): Set CLASSTYPE_HAS_MUTABLE if any
> TYPE_HAS_MUTABLE_P
> for any bases.
>
> * g++.dg/cpp0x/mutable1.C: New test.
>
> --- gcc/cp/class.c.jj 2016-08-12 17:33:42.000000000 +0200
> +++ gcc/cp/class.c 2016-08-29 11:54:10.387061502 +0200
> @@ -1796,6 +1796,8 @@ check_bases (tree t,
> SET_CLASSTYPE_REF_FIELDS_NEED_INIT
> (t, CLASSTYPE_REF_FIELDS_NEED_INIT (t)
> | CLASSTYPE_REF_FIELDS_NEED_INIT (basetype));
> + if (TYPE_HAS_MUTABLE_P (basetype))
> + CLASSTYPE_HAS_MUTABLE (t) = 1;
>
> /* A standard-layout class is a class that:
> ...
> --- gcc/testsuite/g++.dg/cpp0x/mutable1.C.jj 2016-08-29 12:05:13.700212552
> +0200
> +++ gcc/testsuite/g++.dg/cpp0x/mutable1.C 2016-08-29 12:03:51.000000000
> +0200
> @@ -0,0 +1,12 @@
> +// PR c++/77375
> +// { dg-do run { target c++11 } }
> +
> +struct Base { mutable int i; };
> +struct Derived : Base {};
> +const Derived foo{};
> +
> +int
> +main ()
> +{
> + foo.i = 42;
> +}
>
> Jakub
