[Bug c++/91079] New: [DR 1881] Standard-layout classes and unnamed bit-fields

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91079

            Bug ID: 91079
           Summary: [DR 1881] Standard-layout classes and unnamed
                    bit-fields
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: mpolacek at gcc dot gnu.org
  Target Milestone: ---

Cf. https://wg21.link/cwg1881

Test:

struct A { int a : 4; };
struct B : A { int b : 3; };
static_assert(__is_standard_layout(A), "");
static_assert(!__is_standard_layout(B), "");

struct C { int : 0; };
struct D : C { int : 0; };
static_assert(__is_standard_layout(C), "");
static_assert(!__is_standard_layout(D), "");