79 lines
2.5 KiB
C++
79 lines
2.5 KiB
C++
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// RUN: %clang_cc1 -std=c++2a -verify %s -pedantic
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template<typename T> struct Template {};
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struct Linkage1 { struct Inner {}; };
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typedef struct { struct Inner {}; } Linkage2;
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typedef struct {} const NoLinkage1;
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auto x = [] {};
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typedef decltype(x) NoLinkage2;
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auto f() { return [] {}; }
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typedef decltype(f()) NoLinkage3;
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inline auto g() { return [] {}; }
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typedef decltype(g()) VisibleNoLinkage1;
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inline auto y = [] {};
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typedef decltype(y) VisibleNoLinkage2;
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inline auto h() { struct {} x; return x; }
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typedef decltype(h()) VisibleNoLinkage3;
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extern Linkage1 linkage1v;
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extern Linkage1::Inner linkage1iv;
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extern Linkage2 linkage2v;
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extern Linkage2::Inner linkage2iv;
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extern Template<Linkage1> linkaget1v;
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extern Linkage1 linkage1f();
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void linkage2f(Linkage2);
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void use_linkage() {
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&linkage1v, &linkage1iv, &linkage2v, &linkage2iv, &linkaget1v; // expected-warning 5{{unused}}
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linkage1f();
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linkage2f({});
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}
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extern NoLinkage1 no_linkage1(); // expected-error {{function 'no_linkage1' is used but not defined in this translation unit}}
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extern NoLinkage2 no_linkage2(); // expected-error {{function 'no_linkage2' is used but not defined in this translation unit}}
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extern NoLinkage3 no_linkage3(); // expected-error {{function 'no_linkage3' is used but not defined in this translation unit}}
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void use_no_linkage() {
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no_linkage1(); // expected-note {{used here}}
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no_linkage2(); // expected-note {{used here}}
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no_linkage3(); // expected-note {{used here}}
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}
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extern VisibleNoLinkage1 visible_no_linkage1(); // expected-warning {{ISO C++ requires a definition}}
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extern VisibleNoLinkage2 visible_no_linkage2(); // expected-warning {{ISO C++ requires a definition}}
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extern VisibleNoLinkage3 visible_no_linkage3(); // expected-warning {{ISO C++ requires a definition}}
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void use_visible_no_linkage() {
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visible_no_linkage1(); // expected-note {{used here}}
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visible_no_linkage2(); // expected-note {{used here}}
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visible_no_linkage3(); // expected-note {{used here}}
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}
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namespace {
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struct InternalLinkage {};
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}
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InternalLinkage internal_linkage(); // expected-error {{used but not defined}}
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void use_internal_linkage() {
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internal_linkage(); // expected-note {{used here}}
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}
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extern inline int not_defined; // expected-error {{not defined}}
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extern inline int defined_after_use;
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void use_inline_vars() {
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not_defined = 1; // expected-note {{used here}}
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defined_after_use = 2;
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}
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inline int defined_after_use;
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namespace {
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template<typename T> struct A {
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static const int n;
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};
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template<typename T> const int A<T>::n = 3;
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static_assert(A<int>::n == 3);
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int k = A<float>::n;
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}
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