clang/test/PCH/chain-implicit-definition.cpp

   1 // no PCH
   2 // RUN: %clang_cc1 -emit-llvm-only -include %s -include %s %s
   3 // with PCH
   4 // RUN: %clang_cc1 -emit-llvm-only -chain-include %s -chain-include %s %s
   5 #if !defined(PASS1)
   6 #define PASS1
   7
   8 // A base with a virtual dtor.
   9 struct A {
  10   virtual ~A();
  11 };
  12
  13 // A derived class with an implicit virtual dtor.
  14 struct B : A {
  15   // Key function to suppress vtable definition.
  16   virtual void virt();
  17 };
  18
  19 #elif !defined(PASS2)
  20 #define PASS2
  21
  22 // Further derived class that requires ~B().
  23 // Causes definition of ~B(), but it was lost when saving PCH.
  24 struct C : B {
  25   C();
  26   ~C() {}
  27 };
  28
  29 #else
  30
  31 void foo() {
  32   // Variable that requires ~C().
  33   C c;
  34 }
  35
  36 // VTable placement would again cause definition of ~B(), hiding the bug,
  37 // if not for B::virt(), which suppresses the placement.
  38
  39 #endif