clang/test/CXX/dcl.dcl/dcl.spec/dcl.constexpr/p3-2b.cpp

   1 // RUN: %clang_cc1 -verify -std=c++23 -Wpre-c++23-compat %s
   2
   3 constexpr int h(int n) {
   4   if (!n)
   5     return 0;
   6   static const int m = n; // expected-warning {{definition of a static variable in a constexpr function is incompatible with C++ standards before C++23}}
   7   return m;
   8 }
   9
  10 constexpr int i(int n) {
  11   if (!n)
  12     return 0;
  13   thread_local const int m = n; // expected-warning {{definition of a thread_local variable in a constexpr function is incompatible with C++ standards before C++23}}
  14   return m;
  15 }
  16
  17 constexpr int g() {
  18   goto test; // expected-warning {{use of this statement in a constexpr function is incompatible with C++ standards before C++23}}
  19 test:
  20   return 0;
  21 }
  22
  23 constexpr void h() {
  24 label:; // expected-warning {{use of this statement in a constexpr function is incompatible with C++ standards before C++23}}
  25 }
  26
  27 struct NonLiteral { // expected-note 2 {{'NonLiteral' is not literal}}
  28   NonLiteral() {}
  29 };
  30
  31 constexpr void non_literal() {
  32   NonLiteral n; // expected-warning {{definition of a variable of non-literal type in a constexpr function is incompatible with C++ standards before C++23}}
  33 }
  34
  35 constexpr void non_literal2(bool b) {
  36   if (!b)
  37     NonLiteral n; // expected-warning {{definition of a variable of non-literal type in a constexpr function is incompatible with C++ standards before C++23}}
  38 }
  39
  40 constexpr int c_thread_local(int n) {
  41   if (!n)
  42     return 0;
  43   static _Thread_local int a; // expected-warning {{definition of a static variable in a constexpr function is incompatible with C++ standards before C++23}}
  44   _Thread_local int b;        // // expected-error {{'_Thread_local' variables must have global storage}}
  45   return 0;
  46 }
  47
  48 constexpr int gnu_thread_local(int n) {
  49   if (!n)
  50     return 0;
  51   static __thread int a; // expected-warning {{definition of a static variable in a constexpr function is incompatible with C++ standards before C++23}}
  52   __thread int b;        // expected-error {{'__thread' variables must have global storage}}
  53   return 0;
  54 }