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| 1 | +// RUN: %clang_cc1 -fsyntax-only -verify -Wundefined-func-template %s |
| 2 | + |
| 3 | +namespace GH74016 { |
| 4 | + template <typename T> class B { |
| 5 | + public: |
| 6 | + constexpr void foo(const T &) { bar(1); } |
| 7 | + virtual constexpr void bar(unsigned int) = 0; |
| 8 | + }; |
| 9 | + |
| 10 | + template <typename T> class D : public B<T> { |
| 11 | + public: |
| 12 | + constexpr void bar(unsigned int) override {} |
| 13 | + }; |
| 14 | + |
| 15 | + void test() { |
| 16 | + auto t = D<int>(); |
| 17 | + t.foo(0); |
| 18 | + } |
| 19 | +}; |
| 20 | + |
| 21 | +namespace call_pure_virtual_function_from_virtual { |
| 22 | + template <typename T> class B { |
| 23 | + public: |
| 24 | + const void foo(const T &) { B::bar(1); } // expected-warning {{instantiation of function 'call_pure_virtual_function_from_virtual::B<int>::bar' required here, but no definition is available}} |
| 25 | + // expected-note@-1 {{add an explicit instantiation declaration to suppress this warning if 'call_pure_virtual_function_from_virtual::B<int>::bar' is explicitly instantiated in another translation unit}} |
| 26 | + virtual const void bar(unsigned int) = 0; // expected-note {{forward declaration of template entity is here}} |
| 27 | + }; |
| 28 | + |
| 29 | + template <typename T> class D : public B<T> { |
| 30 | + public: |
| 31 | + const void bar(unsigned int) override {} |
| 32 | + }; |
| 33 | + |
| 34 | + void test() { |
| 35 | + auto t = D<int>(); |
| 36 | + t.foo(0); // expected-note {{in instantiation of member function 'call_pure_virtual_function_from_virtual::B<int>::foo' requested here}} |
| 37 | + } |
| 38 | +}; |
| 39 | + |
| 40 | +namespace non_pure_virtual_function { |
| 41 | + template <typename T> class B { |
| 42 | + public: |
| 43 | + constexpr void foo(const T &) { bar(1); } |
| 44 | + |
| 45 | + virtual constexpr void bar(unsigned int); // expected-warning {{inline function 'non_pure_virtual_function::B<int>::bar' is not defined}} |
| 46 | + // expected-note@-1 {{forward declaration of template entity is here}} |
| 47 | + // expected-note@-2 {{forward declaration of template entity is here}} |
| 48 | + // expected-note@-3 {{forward declaration of template entity is here}} |
| 49 | + }; |
| 50 | + |
| 51 | + template <typename T> class D : public B<T> { // expected-warning {{instantiation of function 'non_pure_virtual_function::B<int>::bar' required here, but no definition is available}} |
| 52 | +// expected-warning@-1 {{instantiation of function 'non_pure_virtual_function::B<int>::bar' required here, but no definition is available}} |
| 53 | +// expected-warning@-2 {{instantiation of function 'non_pure_virtual_function::B<int>::bar' required here, but no definition is available}} |
| 54 | +// expected-note@-3 {{add an explicit instantiation declaration to suppress this warning if 'non_pure_virtual_function::B<int>::bar' is explicitly instantiated in another translation unit}} |
| 55 | +// expected-note@-4 {{add an explicit instantiation declaration to suppress this warning if 'non_pure_virtual_function::B<int>::bar' is explicitly instantiated in another translation unit}} |
| 56 | +// expected-note@-5 {{add an explicit instantiation declaration to suppress this warning if 'non_pure_virtual_function::B<int>::bar' is explicitly instantiated in another translation unit}} |
| 57 | +// expected-note@-6 {{used here}} |
| 58 | + |
| 59 | + public: |
| 60 | + constexpr void bar(unsigned int) override { } |
| 61 | + }; |
| 62 | + |
| 63 | + void test() { |
| 64 | + auto t = D<int>(); |
| 65 | + t.foo(0); |
| 66 | + } |
| 67 | +}; |
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