1 // RUN: %clang_cc1 -std=c++1y -triple x86_64-linux-gnu -emit-llvm -o - %s | FileCheck %s 2 3 // Check that we keep the 'extern' when we instantiate the definition of this 4 // variable template specialization. 5 template<typename T> extern const int extern_redecl; 6 template<typename T> const int extern_redecl = 5; 7 template const int extern_redecl<int>; 8 9 // CHECK: @_Z13extern_redeclIiE = weak_odr constant 10 11 template<typename T> struct Outer { 12 template<typename U> struct Inner { 13 template<typename V> static int arr[]; 14 }; 15 }; 16 Outer<char[100]> outer_int; 17 int init_arr(); 18 template<typename T> template<typename U> template<typename V> int Outer<T>::Inner<U>::arr[sizeof(T) + sizeof(U) + sizeof(V)] = { init_arr() }; 19 int *p = Outer<char[100]>::Inner<char[20]>::arr<char[3]>; 20 21 namespace PR35456 { 22 // CHECK: @_ZN7PR354561nILi0EEE = linkonce_odr global i32 0 23 template<int> int n; 24 int *p = &n<0>; 25 } 26 27 // CHECK: @_ZN5OuterIA100_cE5InnerIA20_cE3arrIA3_cEE = linkonce_odr global [123 x i32] zeroinitializer 28 // CHECK: @_ZGVN5OuterIA100_cE5InnerIA20_cE3arrIA3_cEE = linkonce_odr global 29 30 // CHECK: @_ZTHN7PR4211112_GLOBAL__N_11nILi0EEE = internal alias {{.*}} @[[PR42111_CTOR:.*]] 31 32 // CHECK: call {{.*}}@_Z8init_arrv 33 34 // Ensure that we use guarded initialization for an instantiated thread_local 35 // variable with internal linkage. 36 namespace PR42111 { 37 int f(); 38 namespace { template <int = 0> thread_local int n = f(); } 39 // CHECK: define {{.*}}@[[PR42111_CTOR]]( 40 // CHECK: load {{.*}} @_ZGVN7PR4211112_GLOBAL__N_11nILi0EEE 41 // CHECK: icmp eq i8 {{.*}}, 0 42 // CHECK: br i1 43 // CHECK: store i8 1, ptr @_ZGVN7PR4211112_GLOBAL__N_11nILi0EEE 44 // CHECK: call noundef i32 @_ZN7PR421111fEv( 45 // CHECK: [[N_ADDR:%.+]] = call align 4 ptr @llvm.threadlocal.address.p0(ptr align 4 @_ZN7PR4211112_GLOBAL__N_11nILi0EEE) 46 // CHECK: store i32 {{.*}}, ptr [[N_ADDR]] g()47 int g() { return n<> + n<>; } 48 } 49