https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80178
Bug ID: 80178
Summary: Class with implicitly deleted copy and move
constructors usees wrong argument passing ABI
Product: gcc
Version: 6.3.1
Status: UNCONFIRMED
Keywords: ABI
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: redi at gcc dot gnu.org
Target Milestone: ---
We pass this in a register, but I think the ABI says it should be an invisible
reference, because both the copy ctor and move ctor are deleted.
struct A {
A();
A &operator=(A &&o);
void *p;
};
void foo(A);
void bar() {
foo({});
}
In this example they're implicitly defined as deleted because of the
user-provided move assignment operator, but the result is the same whether
implicitly or explicitly deleted.
EDG passes this by invisible reference. Clang passes by value, but that's
acknowledged to be a bug.
