From bug-octave-request at bevo dot che dot wisc dot edu  Wed Oct 28 07:54:11 1998
Subject: 2.1.7 with egcs-1.1b 
From: "John W. Eaton" <jwe at bevo dot che dot wisc dot edu>
To: Joao Cardoso <jcardoso at inescn dot pt>
Cc: bug-octave <bug-octave at bevo dot che dot wisc dot edu>
Date: Wed, 28 Oct 1998 07:53:22 -0600 (CST)

On 28-Oct-1998, Joao Cardoso <jcardoso at inescn dot pt> wrote:

| Thanks for your patches. The last one, regarding src/xdiv.cc produced
| .rej files, so I had to apply it by hand. I enclose the resulting diff.
| 
| Now at the link stage, I got the following error:
| 
| Undefined                       first referenced
|  symbol                             in file
| set_new_handler                     ../src/liboctinterp.so
| 
| This reference come from src/sighandlers.cc.
| 
| Strangly enought, in libstdc++.so.2.9.0 it appears as:
| 
| zorg:# nm -p /usr/local/lib/libstdc++.so.2.9.0 | fgrep set_new_handler
| 00043c38 T set_new_handler__FPFv_v
| zorg:# nm -pC /usr/local/lib/libstdc++.so.2.9.0 | fgrep set_new_handler
| 00043c38 T set_new_handler(void (*)(void))
| 
| while in libstdc++.so.2.8.0 it appear as:
| 
| zorg:# nm -p /usr/local/lib/libstdc++.so.2.8.0 | fgrep set_new_handler
| 00042150 T set_new_handler
| zorg:# nm -pC /usr/local/lib/libstdc++.so.2.8.0 | fgrep set_new_handler
| 00042150 T set_new_handler
| 
| It seems that in the new library the symbol is "mangled"???

In older versions of the libstdc++ header <new>, the declaration for
set_new_handler looked like this:

  extern "C++" {
  typedef void (*new_handler)();
  extern "C" new_handler set_new_handler (new_handler);
  ...

so the name wouldn't have been mangled.  But now it is declared like
this:

  extern "C++" {
  ...
  typedef void (*new_handler)();
  new_handler set_new_handler (new_handler);
  ...

so the name *should* be mangled.  Perhaps you got the wrong version of
this header file when you compiled Octave.

jwe