[Bug c++/126966] New: feature-test- macros __cpp_lib_constexpr_cmath and __cpp_lib_constexpr_complex not work

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126966

            Bug ID: 126966
           Summary: feature-test- macros __cpp_lib_constexpr_cmath and
                    __cpp_lib_constexpr_complex not work
           Product: gcc
           Version: 15.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: gero.peterhoff at gmx dot net
  Target Milestone: ---

int main()
{
#if defined(__cpp_lib_constexpr_cmath)
    std::cout << (__cpp_lib_constexpr_cmath) << "\n";
#else
    std::cout << "no define math\n";
#endif

#if defined(__cpp_lib_constexpr_complex)
    std::cout << (__cpp_lib_constexpr_complex) << "\n";
#else
    std::cout << "no define complex\n";
#endif
}

if you compile with -std=c++23 or -std=gnu++23 or above gets always 

no define math
no define complex