0d923af492
internal linkage entities. Such constructs are ill-formed by [temp.explicit]p13. We make a special exception to permit an invalid construct used by libc++ in some build modes: its <valarray> header declares some functions with the internal_linkage attribute and then (meaninglessly) provides explicit instantiation declarations for them. Luckily, Clang happens to effectively ignore the explicit instantiation declaration when generating code in this case, and this change codifies that behavior. This reinstates part of r359048, reverted in r359076. (The libc++ issue triggering the rollback has been addressed.) llvm-svn: 359259
67 lines
1.7 KiB
C++
67 lines
1.7 KiB
C++
// RUN: %clang_cc1 -fsyntax-only -std=c++11 -verify %s
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// RUN: %clang_cc1 -fsyntax-only -std=c++1y -verify %s -DCXX1Y
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#ifndef CXX1Y
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template<typename T, typename U, U> using alias_ref = T;
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template<typename T, typename U, U> void func_ref() {}
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template<typename T, typename U, U> struct class_ref {};
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template<int N>
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struct U {
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static int a;
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};
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template<int N> struct S; // expected-note 6{{here}}
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template<int N>
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int U<N>::a = S<N>::kError; // expected-error 6{{undefined}}
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template<typename T>
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void f() {
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(void)alias_ref<int, int&, U<0>::a>(); // expected-note {{here}}
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(void)func_ref<int, int&, U<1>::a>(); // expected-note {{here}}
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(void)class_ref<int, int&, U<2>::a>(); // expected-note {{here}}
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};
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template<typename T>
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void not_instantiated() {
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// These cases (arguably) do not require instantiation of U<i>::a.
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(void)alias_ref<int, int&, U<3>::a>();
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(void)func_ref<int, int&, U<4>::a>();
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(void)class_ref<int, int&, U<5>::a>();
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};
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template<int N>
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void fi() {
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(void)alias_ref<int, int&, U<N>::a>(); // expected-note {{here}}
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(void)func_ref<int, int&, U<N+1>::a>(); // expected-note {{here}}
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(void)class_ref<int, int&, U<N+2>::a>(); // expected-note {{here}}
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};
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int main() {
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f<int>(); // expected-note 3{{here}}
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fi<10>(); // expected-note 3{{here}}
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}
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namespace N {
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template<typename T> struct S { static int n; };
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template<typename T> int S<T>::n = 5;
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void g(int*);
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template<typename T> int f() {
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int k[S<T>::n];
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g(k);
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return k[3];
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}
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int j = f<int>();
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}
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#else
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namespace { template<typename> extern int n; }
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template<typename T> int g() { return n<int>; }
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namespace { extern template int n<int>; } // expected-error {{explicit instantiation declaration of 'n<int>' with internal linkage}}
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#endif
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