OK.
On Mon, Feb 6, 2017 at 2:32 PM, Jakub Jelinek <ja...@redhat.com> wrote:
> Hi!
>
> As the testcase shows, with -fpermissive we call operator++() or
> operator--() if operator++(int) or operator--(int) is not available,
> but the new code in build_min_non_dep_op_overload wasn't expecting
> such a change. Fixed thusly, bootstrapped/regtested on x86_64-linux
> and i686-linux, ok for trunk?
>
> 2017-02-06 Jakub Jelinek <ja...@redhat.com>
>
> PR c++/79377
> * tree.c (build_min_non_dep_op_overload): For POST{INC,DEC}REMENT_EXPR
> allow one fewer than expected arguments if flag_permissive.
>
> * g++.dg/lookup/pr79377.C: New test.
>
> --- gcc/cp/tree.c.jj 2017-01-26 20:35:13.000000000 +0100
> +++ gcc/cp/tree.c 2017-02-06 17:30:26.101413319 +0100
> @@ -2938,8 +2938,10 @@ build_min_non_dep_op_overload (enum tree
> nargs = call_expr_nargs (non_dep);
>
> expected_nargs = cp_tree_code_length (op);
> - if (op == POSTINCREMENT_EXPR
> - || op == POSTDECREMENT_EXPR)
> + if ((op == POSTINCREMENT_EXPR
> + || op == POSTDECREMENT_EXPR)
> + /* With -fpermissive non_dep could be operator++(). */
> + && (!flag_permissive || nargs != expected_nargs))
> expected_nargs += 1;
> gcc_assert (nargs == expected_nargs);
>
> --- gcc/testsuite/g++.dg/lookup/pr79377.C.jj 2017-02-06 17:41:22.316931623
> +0100
> +++ gcc/testsuite/g++.dg/lookup/pr79377.C 2017-02-06 17:37:09.000000000
> +0100
> @@ -0,0 +1,36 @@
> +// PR c++/79377
> +// { dg-do run }
> +// { dg-options "-fpermissive" }
> +
> +struct A
> +{
> + A () : a (0) {}
> + A& operator++ () { ++a; ++c; return *this; }
> + int a;
> + static int c;
> +};
> +
> +int A::c = 0;
> +
> +template <typename>
> +void
> +foo (A& a)
> +{
> + a++; // { dg-warning "trying prefix operator instead" }
> + if (A::c != 3 || a.a != 3) __builtin_abort ();
> + ++a;
> + if (A::c != 4 || a.a != 4) __builtin_abort ();
> +}
> +
> +int
> +main ()
> +{
> + A a;
> + if (A::c != 0 || a.a != 0) __builtin_abort ();
> + ++a;
> + if (A::c != 1 || a.a != 1) __builtin_abort ();
> + a++; // { dg-warning "trying prefix operator instead" }
> + if (A::c != 2 || a.a != 2) __builtin_abort ();
> + foo<int> (a);
> + if (A::c != 4 || a.a != 4) __builtin_abort ();
> +}
>
> Jakub
