[Bug c++/78615] error: cannot decrement a pointer to incomplete type
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78615 --- Comment #6 from Jonathan Wakely --- Oh no, the destructor isn't instantiated here. So I guess the structure type *could* be complete where the destructor is instantiated. Possibly still "ill-formed; no diagnostic required" but I'm no longer certain.
[Bug c++/78615] error: cannot decrement a pointer to incomplete type
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78615 --- Comment #5 from Jonathan Wakely --- Definitely invalid. The type is incomplete at the point of instantiation.
[Bug c++/78615] error: cannot decrement a pointer to incomplete type
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78615 Marek Polacek changed: What|Removed |Added CC||mpolacek at gcc dot gnu.org --- Comment #4 from Marek Polacek --- This is again accepted starting with r245612. I haven't figured out yet if it's valid or not (and whether we should add the test).
[Bug c++/78615] error: cannot decrement a pointer to incomplete type
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78615 Richard Biener changed: What|Removed |Added Version|unknown |7.0 --- Comment #3 from Richard Biener --- Yeah, I think this is not valid code.
[Bug c++/78615] error: cannot decrement a pointer to incomplete type
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78615 --- Comment #2 from Andrew Pinski --- I don't think this is valid code and here is why: struct QListNode is incomplete. You use an instantiation of QList via class B which means all methods of QList are instantiated.
[Bug c++/78615] error: cannot decrement a pointer to incomplete type
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78615 Martin Liška changed: What|Removed |Added Known to work||5.4.0, 6.2.0 Known to fail||7.0 --- Comment #1 from Martin Liška --- clang++ 3.8.1 accepts the code.
