[Bug c++/123387] New: deleted spaceship not used as best overload over builtin releational operators

[tobi--- via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123387

            Bug ID: 123387
           Summary: deleted spaceship not used as best overload over
                    builtin releational operators
           Product: gcc
           Version: 15.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: t...@die-loews.de
  Target Milestone: ---

Hi,

the following code should select the deleted spaceship operator and compilation
should fail, but it compiles without errors (tested with x86-64 gcc 15.2 /
std=c++20 on godbolt.org)


***************************************************************

#include <compare>

enum E{ a };

std::partial_ordering operator<=> (E l, E r) = delete; 

bool test_1() {
    return a <= a;          // <- error expected
}