0c92f8646a
Warning '-Wundefined-func-template' incorrectly indicates that no definition is available for a pure virtual function. However, a definition is not needed for a pure virtual function. Fixes #74016
68 lines
3.0 KiB
C++
68 lines
3.0 KiB
C++
// RUN: %clang_cc1 -fsyntax-only -verify -Wundefined-func-template %s
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namespace GH74016 {
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template <typename T> class B {
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public:
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constexpr void foo(const T &) { bar(1); }
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virtual constexpr void bar(unsigned int) = 0;
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};
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template <typename T> class D : public B<T> {
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public:
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constexpr void bar(unsigned int) override {}
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};
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void test() {
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auto t = D<int>();
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t.foo(0);
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}
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};
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namespace call_pure_virtual_function_from_virtual {
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template <typename T> class B {
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public:
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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}}
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// 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}}
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virtual const void bar(unsigned int) = 0; // expected-note {{forward declaration of template entity is here}}
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};
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template <typename T> class D : public B<T> {
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public:
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const void bar(unsigned int) override {}
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};
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void test() {
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auto t = D<int>();
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t.foo(0); // expected-note {{in instantiation of member function 'call_pure_virtual_function_from_virtual::B<int>::foo' requested here}}
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}
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};
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namespace non_pure_virtual_function {
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template <typename T> class B {
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public:
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constexpr void foo(const T &) { bar(1); }
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virtual constexpr void bar(unsigned int); // expected-warning {{inline function 'non_pure_virtual_function::B<int>::bar' is not defined}}
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// expected-note@-1 {{forward declaration of template entity is here}}
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// expected-note@-2 {{forward declaration of template entity is here}}
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// expected-note@-3 {{forward declaration of template entity is here}}
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};
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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}}
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// expected-warning@-1 {{instantiation of function 'non_pure_virtual_function::B<int>::bar' required here, but no definition is available}}
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// expected-warning@-2 {{instantiation of function 'non_pure_virtual_function::B<int>::bar' required here, but no definition is available}}
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// 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}}
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// 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}}
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// 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}}
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// expected-note@-6 {{used here}}
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public:
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constexpr void bar(unsigned int) override { }
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};
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void test() {
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auto t = D<int>();
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t.foo(0);
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}
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};
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