[Bug c++/86949] New: gcc generate an error because delete operator is private when it isn't needed

["tyker at outlook dot com" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86949

            Bug ID: 86949
           Summary: gcc generate an error because delete operator is
                    private when it isn't needed
           Product: gcc
           Version: 9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: tyker at outlook dot com
  Target Milestone: ---

in this code:

#include <new>

struct X {
    X() noexcept { }
    private:
    static void operator delete(void*);
};

int main() { 
    X* x = new(std::nothrow) X{}; 
}

the delete operator is private but it isn't needed because the contructor and
the allocator can't throw. but gcc generate an error complaining that the
delete operator is private.

all other majors complier complie this code without errors except gcc:
https://godbolt.org/#z:OYLghAFBqd5QCxAYwPYBMCmBRdBLAF1QCcAaPECAKxAEZSAbAQwDtRkBSAJgCFufSAZ1QBXYskwgA5NwDMeFsgYisAag6yAwi0wB3Ddg4AGAILGTggsRHICqgBrqA7H1Or3DiAEpVLVJgAPCQAHOw4XZwARcw9VYOI8ADcmAkkYj0sUvGRVRNQ8dFVUYMxiFJJVLAZMVIg8goAqLw1XMydo2VbzBTsAWyYFb2cedTcPewbVAPVZSN89CEt0EBA/AgRiVF0fe3C%2BdpbRtsipL0ZpAFYpUhZpI2vUaU1%2BflVhMQl1Lllaa4I705nADWIFkXAAdAA2IwXGGyIwADgRABYuABOIzI85SZHXW5Se6kR5Sa6CEBGUj/AmnUhwWAwRAoVC9YJ4apkCgQNAstmlEDABFcUgAMzZqWIZIgACMAaQpQomMQAJ7SX6kbm9TAsAgAeRYDBV1NIWH6bGqsvwxEwtiSmDJRsC1pEqVV1x6mAYsqseF6rrOzDYKBevEYeClZMgZ2KBDwqBY9tJonEklo/sueNlxICCMhAFpIcjVMBkDkEeCuKoILhCBU5PRVJpmaz2V8fj5nrx%2BH8AV5gSAuLRwcjUZDZE40VxkU5ZBdaLRZNjcaRfci0eCnJCMRcfrQnE5BWj6PjCcTSeTKT3aQyIEhuc3SuRKHfecQUAxaGiAPoFkVi0qSmUjXlFhFUNNUNS1XV9UNQkTVYYBzSNS1rRjRI7VlR1kGdSQpDVd1PSNb1fVwmkA3YYMBAYMMI28IlQljeNpETD4UzTKQrhuTNpGzPMC1UABZABlAA1TRVA/VQuCMXdVAAJQAFQAdUrasiGIVt60bHkWzkLh2wo7tqV7UgEEwJgsFfWiCKXX1YXLeE0WRSEkS4AcnCPLiSSEc8qXuYyQVkWR12%2BSELgLWgkWRGcnAubFZAzI1TwvIyr3gOlGWfdlHy5JsXxAbJkAi38GHFADZWA0DXXVZlNW1PUDQtTBTQQnDYLwK0bTQ%2B1CUw7Cqvwr0EmI35/XgoNOxDKjw3gKN6LjBMhCTCQ6DYjjjwebic3zQsCvEssjHBIwVPwNSNNIBtcp075ZH0iaeEMvy%2B0C9c0QuWdBSMJwuAPehrOuFc10ii4uFCi4kUPJzOMSpjvIpXyaXSm8mW0h9OUyvklHg6EKVFEr/0oQDCQq5UqoguroMa5rELajrUPQh0AidF0SPIbUPUGn0/UYMbODu0NpsjOiY3mmH3mTFbsTWzyeO21RMbYVRIUOw7jprdS63OrT73V75kVuvheAewETLMizKDYmyQDsucLinWRhznRFtyxdaiVFnyeyeoLIXc9FMQnL7p0hSE4oSk8Yfh4yCK4MONq8yOzjQiUGJAZEgA%3D%3D

note that in this code:

#include <new>

struct X {
    X() noexcept { }
    static void operator delete(void*) = delete;
};

int main() { 
    X* x = new(std::nothrow) X{}; 
}

where the operator delete isn't needed and explicitly deleted gcc compiles
correctly.