1 // RUN: %clang_cc1 -std=c++1z %s -emit-llvm -o - -triple x86_64-linux-gnu | FileCheck %s 2 3 struct Q { 4 // CHECK: @_ZN1Q1kE = linkonce_odr constant i32 5, comdat 5 static constexpr int k = 5; 6 }; 7 const int &r = Q::k; 8 9 int f(); 10 11 // const does not imply internal linkage. 12 // CHECK: @external_inline = linkonce_odr constant i32 5, comdat 13 inline const int external_inline = 5; 14 const int &use1 = external_inline; 15 16 // static still does, though. 17 // CHECK: @_ZL15internal_inline = internal constant i32 5 18 static inline const int internal_inline = 5; 19 const int &use2 = internal_inline; 20 21 int a = f(); 22 // CHECK: @b = linkonce_odr global i32 0, comdat 23 // CHECK: @_ZGV1b = linkonce_odr global i64 0, comdat($b) 24 inline int b = f(); 25 int c = f(); 26 27 // For compatibility with C++11 and C++14, an out-of-line declaration of a 28 // static constexpr local variable promotes the variable to weak_odr. 29 struct compat { 30 static constexpr int a = 1; 31 static constexpr int b = 2; 32 static constexpr int c = 3; 33 static inline constexpr int d = 4; 34 static const int e = 5; 35 static const int f = 6; 36 static const int g = 7; 37 }; 38 const int &compat_use_before_redecl = compat::b; 39 const int compat::a; 40 const int compat::b; 41 const int compat::c; 42 const int compat::d; 43 const int compat::e; 44 constexpr int compat::f; 45 constexpr inline int compat::g; 46 const int &compat_use_after_redecl1 = compat::c; 47 const int &compat_use_after_redecl2 = compat::d; 48 const int &compat_use_after_redecl3 = compat::g; 49 // CHECK-DAG: @_ZN6compat1bE = weak_odr constant i32 2 50 // CHECK-DAG: @_ZN6compat1aE = weak_odr constant i32 1 51 // CHECK-DAG: @_ZN6compat1cE = weak_odr constant i32 3 52 // CHECK-DAG: @_ZN6compat1dE = linkonce_odr constant i32 4 53 // CHECK-DAG: @_ZN6compat1eE = constant i32 5 54 // CHECK-DAG: @_ZN6compat1fE = weak_odr constant i32 6 55 // CHECK-DAG: @_ZN6compat1gE = linkonce_odr constant i32 7 56 57 template<typename T> struct X { 58 static int a; 59 static inline int b; 60 static int c; 61 }; 62 // CHECK: @_ZN1XIiE1aE = linkonce_odr global i32 10 63 // CHECK: @_ZN1XIiE1bE = global i32 20 64 // CHECK-NOT: @_ZN1XIiE1cE 65 template<> inline int X<int>::a = 10; 66 int &use3 = X<int>::a; 67 template<> int X<int>::b = 20; 68 template<> inline int X<int>::c = 30; 69 70 template<typename T> struct Y; 71 template<> struct Y<int> { 72 static constexpr int a = 123; 73 static constexpr int b = 456; 74 static constexpr int c = 789; 75 }; 76 // CHECK: @_ZN1YIiE1aE = weak_odr constant i32 123 77 constexpr int Y<int>::a; 78 // CHECK: @_ZN1YIiE1bE = linkonce_odr constant i32 456 79 const int &yib = Y<int>::b; 80 // CHECK-NOT: @_ZN1YIiE1cE 81 82 // CHECK-LABEL: define {{.*}}global_var_init 83 // CHECK: call i32 @_Z1fv 84 85 // CHECK-LABEL: define {{.*}}global_var_init 86 // CHECK-NOT: comdat 87 // CHECK-SAME: {{$}} 88 // CHECK: load atomic {{.*}} acquire 89 // CHECK: br 90 // CHECK: __cxa_guard_acquire(i64* @_ZGV1b) 91 // CHECK: br 92 // CHECK: call i32 @_Z1fv 93 // CHECK: __cxa_guard_release(i64* @_ZGV1b) 94 95 // CHECK-LABEL: define {{.*}}global_var_init 96 // CHECK: call i32 @_Z1fv 97 98 template<typename T> inline int d = f(); 99 int e = d<int>; 100 101 // CHECK-LABEL: define {{.*}}global_var_init{{.*}}comdat 102 // CHECK: _ZGV1dIiE 103 // CHECK-NOT: __cxa_guard_acquire(i64* @_ZGV1b) 104 // CHECK: call i32 @_Z1fv 105 // CHECK-NOT: __cxa_guard_release(i64* @_ZGV1b) 106