From mboxrd@z Thu Jan  1 00:00:00 1970
From: Franz Sirl <Franz.Sirl-kernel@lauterbach.com>
To: binutils@sourceware.cygnus.com
Cc: drow@false.org, geoffk@ozemail.com.au
Subject: R_PPC_LOCAL24PC c++ linking problems with current binutils
Date: Mon, 19 Jul 1999 15:21:00 -0000
Message-id: <99072000221900.00843@ns1102.munich.netsurf.de>
X-SW-Source: 1999-q3/msg00266.html

Hi,

linking this little program currently fails on Linux/PPC, glibc-2.1:

mmaptest.cc:
#include <string>
class FileFd
{
public:
   int iFd;
   unsigned long Flags;
   string FileName;


   FileFd(int Fd,bool) : iFd(Fd), Flags(0) {};
   virtual ~FileFd();
};


Compiling with c++ -o mmaptest.so -fPIC -shared mmaptest.cc gives:
mmaptest.o: In function `__default_alloc_template<true, 0>::_S_chunk_alloc(unsigned int, int &)':
mmaptest.o(.__default_alloc_template<true, 0>::gnu.linkonce.t._S_chunk_alloc(unsigned int, int &)+0x234): undefined reference to `__default_alloc_template<true, 0>::_S_chunk_alloc(unsigned int, int &)'
mmaptest.o(.__default_alloc_template<true, 0>::gnu.linkonce.t._S_chunk_alloc(unsigned int, int &)+0x2a8): undefined reference to `__default_alloc_template<true, 0>::_S_chunk_alloc(unsigned int, int &)'
collect2: ld returned 1 exit status

The relevant code in elf32-ppc.c looks like:

        /* Relocations that need no special processing.  */
        case (int)R_PPC_LOCAL24PC:
          /* It makes no sense to point a local relocation
             at a symbol not in this object.  */
          if (h != NULL
              && (h->root.type == bfd_link_hash_defined
                  || h->root.type == bfd_link_hash_defweak)
              && sec->output_section == NULL)
            {
              if (! (*info->callbacks->undefined_symbol) (info,
                                                          h->root.root.string,
                                                          input_bfd,
                                                          input_section,
                                                          rel->r_offset))
                return false;
              continue;
            }
          break;

We enter here with h->root.type == bfd_link_hash_defined and
sec->output_section == NULL for the symbols in question. This didn't happen
older binutils (2.9.1) and it maybe related to the following patch:

Tue Jun  2 13:51:00 1998  Geoff Keating  <geoffk@ozemail.com.au>

        * elf32-ppc.c (ppc_elf_relocate_section): The target of an
        R_PPC_LOCAL24PC relocation should be local; if not, print an error
        message instead of crashing.

I'm lost here for the moment. If I can test anything else, please let me know.

Franz.