clang/test/CodeGenCXX/duplicate-mangled-name.cpp

   1 // RUN: %clang_cc1 -triple %itanium_abi_triple -emit-llvm-only %s -verify -DTEST1
   2 // RUN: %clang_cc1 -triple %itanium_abi_triple-only %s -verify -DTEST2 -emit-llvm -o - | FileCheck %s
   3 // RUN: %clang_cc1 -triple %itanium_abi_triple -emit-llvm-only %s -verify -DTEST3
   4 // RUN: %clang_cc1 -triple %itanium_abi_triple -emit-llvm-only %s -verify -DTEST4
   5
   6 #ifdef TEST1
   7
   8 class MyClass {
   9  static void meth();
  10 };
  11 void MyClass::meth() { } // expected-note {{previous}}
  12 extern "C" {
  13   void _ZN7MyClass4methEv() { } // expected-error {{definition with same mangled name '_ZN7MyClass4methEv' as another definition}}
  14 }
  15
  16 #elif TEST2
  17
  18 // expected-no-diagnostics
  19
  20 // We expect no warnings here, as there is only declaration of _ZN1TD1Ev
  21 // function, no definitions.
  22 extern "C" void _ZN1TD1Ev();
  23 struct T {
  24   ~T() {}
  25 };
  26
  27 // We expect no warnings here, as there is only declaration of _ZN2nm3abcE
  28 // global, no definitions.
  29 extern "C" {
  30   int _ZN2nm3abcE;
  31 }
  32
  33 namespace nm {
  34   float abc = 2;
  35 }
  36 // CHECK: @_ZN2nm3abcE = {{(dso_local )?}}global float
  37
  38 float foo() {
  39   _ZN1TD1Ev();
  40 // CHECK: call void @_ZN1TD1Ev()
  41   T t;
  42 // CHECK: call {{.*}} @_ZN1TD1Ev(ptr {{[^,]*}} %t)
  43   return _ZN2nm3abcE + nm::abc;
  44 }
  45
  46 #elif TEST3
  47
  48 extern "C" void _ZN2T2D2Ev() {}; // expected-note {{previous definition is here}}
  49
  50 struct T2 {
  51   ~T2() {} // expected-error {{definition with same mangled name '_ZN2T2D2Ev' as another definition}}
  52 };
  53
  54 void foo() {
  55   _ZN2T2D2Ev();
  56   T2 t;
  57 }
  58
  59 #elif TEST4
  60
  61 extern "C" {
  62   int _ZN2nm3abcE = 1; // expected-note {{previous definition is here}}
  63 }
  64
  65 namespace nm {
  66   float abc = 2; // expected-error {{definition with same mangled name '_ZN2nm3abcE' as another definition}}
  67 }
  68
  69 float foo() {
  70   return _ZN2nm3abcE + nm::abc;
  71 }
  72
  73 #else
  74
  75 #error Unknown test
  76
  77 #endif
  78