59 lines · cpp
1// RUN: %clang_cc1 -std=c++1y -Wno-unused-value -triple x86_64-linux-gnu -emit-llvm -o - %s | FileCheck %s2 3// Check that we keep the 'extern' when we instantiate the definition of this4// variable template specialization.5template<typename T> extern const int extern_redecl;6template<typename T> const int extern_redecl = 5;7template const int extern_redecl<int>;8 9// CHECK: @_Z13extern_redeclIiE = weak_odr constant10 11template<typename T> struct Outer {12 template<typename U> struct Inner {13 template<typename V> static int arr[];14 };15};16Outer<char[100]> outer_int;17int init_arr();18template<typename T> template<typename U> template<typename V> int Outer<T>::Inner<U>::arr[sizeof(T) + sizeof(U) + sizeof(V)] = { init_arr() };19int *p = Outer<char[100]>::Inner<char[20]>::arr<char[3]>;20 21//CHECK: @_ZN8GH1406221gIiEE = linkonce_odr constant %"struct.GH140622::S" zeroinitializer22namespace GH140622 {23template <typename> struct S {};24template <typename T> constexpr S<T> g;25void test() {26 constexpr auto x = 42;27 x, g<int>;28}29}30 31namespace PR35456 {32// CHECK: @_ZN7PR354561nILi0EEE = linkonce_odr global i32 033template<int> int n;34int *p = &n<0>;35}36 37// CHECK: @_ZN5OuterIA100_cE5InnerIA20_cE3arrIA3_cEE = linkonce_odr global [123 x i32] zeroinitializer38// CHECK: @_ZGVN5OuterIA100_cE5InnerIA20_cE3arrIA3_cEE = linkonce_odr global39 40// CHECK: @_ZTHN7PR4211112_GLOBAL__N_11nILi0EEE = internal alias {{.*}} @[[PR42111_CTOR:.*]]41 42// CHECK: call {{.*}}@_Z8init_arrv43 44// Ensure that we use guarded initialization for an instantiated thread_local45// variable with internal linkage.46namespace PR42111 {47 int f();48 namespace { template <int = 0> thread_local int n = f(); }49 // CHECK: define {{.*}}@[[PR42111_CTOR]](50 // CHECK: load {{.*}} @_ZGVN7PR4211112_GLOBAL__N_11nILi0EEE51 // CHECK: icmp eq i8 {{.*}}, 052 // CHECK: br i153 // CHECK: store i8 1, ptr @_ZGVN7PR4211112_GLOBAL__N_11nILi0EEE54 // CHECK: call noundef i32 @_ZN7PR421111fEv(55 // CHECK: [[N_ADDR:%.+]] = call align 4 ptr @llvm.threadlocal.address.p0(ptr align 4 @_ZN7PR4211112_GLOBAL__N_11nILi0EEE)56 // CHECK: store i32 {{.*}}, ptr [[N_ADDR]]57 int g() { return n<> + n<>; }58}59