https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95567
Bug ID: 95567
Summary: Defaulted virtual <=> has the wrong behavior
Product: gcc
Version: 10.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: barry.revzin at gmail dot com
Target Milestone: ---
Reduced from Twitter user @feder_and_ink:
#include <compare>
struct B {
B(int i) : i(i) {}
VIRTUAL std::strong_ordering operator<=>(B const& other) const = default;
int i;
};
struct D : B {
D(int i, int j) : B(i), j(j) {}
int j;
};
bool check() {
return B(2) == D(2, 3);
}
With -DVIRTUAL=, check() returns true.
With -DVIRTUAL=virtual, check() erroneously returns false.
On compiler explorer: https://godbolt.org/z/hc3U5f
