clang/test/SemaCXX/attr-exclude_from_explicit_instantiation.diagnose_on_undefined_entity.cpp

   1 // RUN: %clang_cc1 -fsyntax-only -Wundefined-func-template -Wundefined-var-template -verify %s
   2
   3 // Test that a diagnostic is emitted when an entity marked with the
   4 // exclude_from_explicit_instantiation attribute is not defined in
   5 // the current TU but it is used (and it is hence implicitly
   6 // instantiated).
   7
   8 #define EXCLUDE_FROM_EXPLICIT_INSTANTIATION __attribute__((exclude_from_explicit_instantiation))
   9
  10 template <class T>
  11 struct Foo {
  12   EXCLUDE_FROM_EXPLICIT_INSTANTIATION void non_static_member_function(); // expected-note{{forward declaration of template entity is here}}
  13   EXCLUDE_FROM_EXPLICIT_INSTANTIATION static void static_member_function(); // expected-note{{forward declaration of template entity is here}}
  14   EXCLUDE_FROM_EXPLICIT_INSTANTIATION static int static_data_member; // expected-note{{forward declaration of template entity is here}}
  15   struct EXCLUDE_FROM_EXPLICIT_INSTANTIATION nested {
  16     static int static_member_function(); // expected-note{{forward declaration of template entity is here}}
  17   };
  18 };
  19
  20 extern template struct Foo<int>;
  21
  22 void use() {
  23   Foo<int> foo;
  24
  25   foo.non_static_member_function(); // expected-warning{{instantiation of function 'Foo<int>::non_static_member_function' required here, but no definition is available}}
  26   // expected-note@-1 {{add an explicit instantiation}}
  27
  28   Foo<int>::static_member_function(); // expected-warning{{instantiation of function 'Foo<int>::static_member_function' required here, but no definition is available}}
  29   // expected-note@-1 {{add an explicit instantiation}}
  30
  31   (void)Foo<int>::static_data_member; // expected-warning{{instantiation of variable 'Foo<int>::static_data_member' required here, but no definition is available}}
  32   // expected-note@-1 {{add an explicit instantiation}}
  33
  34   Foo<int>::nested::static_member_function(); // expected-warning{{instantiation of function 'Foo<int>::nested::static_member_function' required here, but no definition is available}}
  35   // expected-note@-1 {{add an explicit instantiation}}
  36 }