bug in egcs-1.1b on i586-linux

[Vasilis Samoladas]

Hi all. I am submitting the following bug. Just cut the rest of the
message and save it to file bugtst.cc. Instructions are contained in
the comments.

------------ CUT HERE -------------------
// Bug report
// ===========

// This program exposes a bug in egcs-1.1b when compiling with -O, on 
// a Rredhat-5.0-i586 linux system.
//
// The problem is that methods of local classes (not in global scope)
// will not have code produced for them. This error is caught
// by the linker. A peculiarity of this bug is that it is only observed
// for local classes which inherit from some other (global) class.
// 
//

// Versions:

// % /opt/bin/g++ -v
// Reading specs from /opt/lib/gcc-lib/i586-pc-linux-gnu/egcs-2.91.57/specs
// gcc version egcs-2.91.57 19980901 (egcs-1.1 release)

// % ld -v
// GNU ld version 2.9.1 (with BFD 2.9.1.0.15)

// Bug:

// % /opt/bin/g++ -O2 -o bugtst bugtst.cc
// /tmp/ccB0f01X.o(.gnu.linkonce.d.__vt_Q26main.0_9TEMPclass+0x8): undefined reference to `get__CQ26main.0_9TEMPclass.287'
// collect2: ld returned 1 exit status

// Notice1: It only appears with optimizations on.

// % /opt/bin/g++ -o bugtst bugtst.cc
// % # all OK!!

// Notice2: g++ 2.8.0 does not have this bug.


// ---------- example program --------------------

// -*- c++ -*-  File: bugtst.cc

#include <iostream.h>

// This is a base class for GLOBclass and TEMPclass
class baseclass {
public:
  virtual int get() const=0;
};

// This is a global class which only implements get()
class GLOBclass : public baseclass {
  int i;
public:
  GLOBclass(int _i) : i(_i) { };
  int get() const { return i; };
};


int main()
{

  // This is a local class which only implements get(), identical
  // to GLOBclass
  class TEMPclass 
    // if the next line is commented out, there is no problem
    : public baseclass 
  {
    int i;
  public:
    TEMPclass(int _i) : i(_i) { };
    int get() const { return i; };
  };

  cout << TEMPclass(1).get() << endl;

  cout << GLOBclass(2).get() << endl;

}


// ---------- end example program --------------------

// output of nm on bugtst.cc, compiled with
// /opt/bin/g++ -O2 -c bugtst.cc

// % nm bugtst.o 
// 00000000 ? .LFB3
// 00000000 ? .LFB4
// 00000000 ? .LFB5
// 00000000 ? .LFB6
// 00000030 ? .LFE3
// 00000030 ? .LFE5
// 00000026 ? .LFE6
// 00000000 ? __FRAME_BEGIN__
// 00000000 t __Q26main.0_9TEMPclassi.286
//          U __ls__7ostreami
//          U __rtti_si
//          U __rtti_user
// 00000000 W __tf9GLOBclass
// 00000000 W __tf9baseclass
// 00000000 W __tfQ26main.0_9TEMPclass
//          U __throw
// 0000000c C __ti9GLOBclass
// 00000008 C __ti9baseclass
// 0000000c C __tiQ26main.0_9TEMPclass
// 00000000 W __vt_9GLOBclass
// 00000000 W __vt_Q26main.0_9TEMPclass
//          U cout
//          U endl__FR7ostream
// 00000000 t gcc2_compiled.
// 00000000 W get__C9GLOBclass
//          U get__CQ26main.0_9TEMPclass.287
// 00000018 T main