--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/g++.dg/torture/pr41775.C	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,284 @@
+/* { dg-do compile } */
+/* { dg-require-visibility "" } */
+
+typedef unsigned int size_t;
+namespace std __attribute__ ((__visibility__ ("default")))
+{
+  template < typename _Iterator > struct iterator_traits
+  {
+  };
+  template < typename _Tp > struct iterator_traits <_Tp * >
+  {
+    typedef _Tp & reference;
+  };
+}
+
+namespace __gnu_cxx __attribute__ ((__visibility__ ("default")))
+{
+  using std::iterator_traits;
+  template < typename _Iterator, typename _Container > class __normal_iterator
+  {
+  public:typedef _Iterator iterator_type;
+    typedef typename iterator_traits < _Iterator >::reference reference;
+    reference operator* () const
+    {
+    }
+    __normal_iterator operator++ (int)
+    {
+    }
+  };
+  template < typename _IteratorL, typename _IteratorR,
+    typename _Container > inline bool operator!= (const __normal_iterator <
+						  _IteratorL,
+						  _Container > &__lhs,
+						  const __normal_iterator <
+						  _IteratorR,
+						  _Container > &__rhs)
+  {
+  }
+}
+
+extern "C"
+{
+  extern "C"
+  {
+    __extension__ typedef __SIZE_TYPE__ __intptr_t;
+  }
+}
+namespace __gnu_cxx __attribute__ ((__visibility__ ("default")))
+{
+  template < typename _Tp > class new_allocator
+  {
+  public:typedef size_t size_type;
+    typedef _Tp *pointer;
+    template < typename _Tp1 > struct rebind
+    {
+      typedef new_allocator < _Tp1 > other;
+    };
+  };
+}
+
+namespace std __attribute__ ((__visibility__ ("default")))
+{
+template < typename _Tp > class allocator:public __gnu_cxx::new_allocator <
+    _Tp >
+  {
+  };
+}
+
+extern "C"
+{
+  typedef __intptr_t intptr_t;
+}
+namespace llvm
+{
+  template < typename NodeTy > class ilist_half_node
+  {
+  };
+template < typename NodeTy > class ilist_node:private ilist_half_node <
+    NodeTy >
+  {
+  };
+  class MachineBasicBlock;
+  class MachineOperand
+  {
+  public:enum MachineOperandType
+    {
+    }
+    Contents;
+    unsigned getReg () const
+    {
+    }
+  };
+  class TargetRegisterInfo;
+}
+
+namespace std __attribute__ ((__visibility__ ("default")))
+{
+  template < typename _Tp, typename _Alloc > struct _Vector_base
+  {
+    typedef typename _Alloc::template rebind < _Tp >::other _Tp_alloc_type;
+  };
+template < typename _Tp, typename _Alloc = std::allocator < _Tp > >class vector:protected _Vector_base < _Tp,
+    _Alloc
+    >
+  {
+    typedef _Vector_base < _Tp, _Alloc > _Base;
+    typedef typename _Base::_Tp_alloc_type _Tp_alloc_type;
+  public:typedef _Tp value_type;
+    typedef typename _Tp_alloc_type::pointer pointer;
+    typedef __gnu_cxx::__normal_iterator < pointer, vector > iterator;
+    iterator begin ()
+    {
+    }
+    iterator end ()
+    {
+    }
+  };
+}
+
+namespace llvm
+{
+  class MachineFunction;
+  class MachineInstr:public ilist_node < MachineInstr >
+  {
+  public:const MachineBasicBlock *getParent () const
+    {
+    }
+    const MachineOperand & getOperand (unsigned i) const
+    {
+    }
+    bool registerDefIsDead (unsigned Reg, const TargetRegisterInfo * TRI =
+			    __null) const
+    {
+    }
+  };
+  class AnalysisResolver;
+  class Pass
+  {
+    AnalysisResolver *Resolver;
+    intptr_t PassID;
+  public:  explicit Pass (intptr_t pid):Resolver (0), PassID (pid)
+    {
+    }
+    explicit Pass (const void *pid):Resolver (0), PassID ((intptr_t) pid)
+    {
+    }
+    template < typename AnalysisType > AnalysisType & getAnalysis () const;
+  };
+  class FunctionPass:public Pass
+  {
+  public:explicit FunctionPass (intptr_t pid):Pass (pid)
+    {
+    }
+    explicit FunctionPass (const void *pid):Pass (pid)
+    {
+    }
+  };
+  class PassInfo
+  {
+  public:typedef Pass *(*NormalCtor_t) ();
+  private:const char *const PassName;
+    const char *const PassArgument;
+    const intptr_t PassID;
+    const bool IsCFGOnlyPass;
+    const bool IsAnalysis;
+    const bool IsAnalysisGroup;
+    NormalCtor_t NormalCtor;
+  public:   PassInfo (const char *name, const char *arg, intptr_t pi, NormalCtor_t normal = 0, bool isCFGOnly = false, bool is_analysis = false):PassName (name), PassArgument (arg), PassID (pi),
+      IsCFGOnlyPass (isCFGOnly), IsAnalysis (is_analysis),
+      IsAnalysisGroup (false), NormalCtor (normal)
+    {
+    }
+  };
+  template < typename PassName > Pass * callDefaultCtor ()
+  {
+    return new PassName ();
+  }
+  template < typename passName > struct RegisterPass:public PassInfo
+  {
+  RegisterPass (const char *PassArg, const char *Name, bool CFGOnly = false, bool is_analysis = false):PassInfo (Name, PassArg, intptr_t (&passName::ID),
+	      PassInfo::NormalCtor_t (callDefaultCtor < passName >), CFGOnly,
+	      is_analysis)
+    {
+    }
+  };
+  template < typename T > class SmallVectorImpl
+  {
+  };
+  template < typename T,
+    unsigned N > class SmallVector:public SmallVectorImpl < T >
+  {
+  };
+  class MachineFunctionPass:public FunctionPass
+  {
+  protected:explicit MachineFunctionPass (intptr_t ID):FunctionPass (ID)
+    {
+    }
+    explicit MachineFunctionPass (void *ID):FunctionPass (ID)
+    {
+    }
+    virtual bool runOnMachineFunction (MachineFunction & MF) = 0;
+  };
+  class LiveIndex
+  {
+  private:unsigned index;
+  };
+  class VNInfo
+  {
+  };
+  struct LiveRange
+  {
+    LiveIndex start;
+    LiveIndex end;
+    VNInfo *valno;
+  };
+  class LiveInterval
+  {
+  public:typedef SmallVector < LiveRange, 4 > Ranges;
+    bool containsOneValue () const
+    {
+    }
+    LiveRange *getLiveRangeContaining (LiveIndex Idx)
+    {
+    }
+    void removeRange (LiveIndex Start, LiveIndex End, bool RemoveDeadValNo =
+		      false);
+    void removeRange (LiveRange LR, bool RemoveDeadValNo = false)
+    {
+      removeRange (LR.start, LR.end, RemoveDeadValNo);
+    }
+  };
+  class LiveIntervals:public MachineFunctionPass
+  {
+  public:static char ID;
+    LiveIndex getDefIndex (LiveIndex index)
+    {
+    }
+    LiveInterval & getInterval (unsigned reg)
+    {
+    }
+    LiveIndex getInstructionIndex (const MachineInstr * instr) const
+    {
+    }
+  };
+}
+
+using namespace llvm;
+namespace
+{
+struct __attribute__ ((visibility ("hidden"))) StrongPHIElimination:public
+    MachineFunctionPass
+  {
+    static char ID;
+  StrongPHIElimination ():MachineFunctionPass (&ID)
+    {
+    }
+    bool runOnMachineFunction (MachineFunction & Fn);
+  };
+}
+
+static RegisterPass < StrongPHIElimination > X ("strong-phi-node-elimination",
+						"Eliminate PHI nodes for register allocation, intelligently");
+bool
+StrongPHIElimination::runOnMachineFunction (MachineFunction & Fn)
+{
+  LiveIntervals & LI = getAnalysis < LiveIntervals > ();
+  std::vector < MachineInstr * >phis;
+  for (std::vector < MachineInstr * >::iterator I = phis.begin (), E =
+       phis.end (); I != E;)
+    {
+      MachineInstr *PInstr = *(I++);
+      unsigned DestReg = PInstr->getOperand (0).getReg ();
+      LiveInterval & PI = LI.getInterval (DestReg);
+      if (PInstr->registerDefIsDead (DestReg))
+	{
+	  if (PI.containsOneValue ())
+	    {
+	      LiveIndex idx =
+		LI.getDefIndex (LI.getInstructionIndex (PInstr));
+	      PI.removeRange (*PI.getLiveRangeContaining (idx), true);
+	    }
+	}
+    }
+}