From owner-freebsd-current  Mon Jan 22 09:23:14 1996
Return-Path: owner-current
Received: (from root@localhost)
          by freefall.freebsd.org (8.7.3/8.7.3) id JAA28755
          for current-outgoing; Mon, 22 Jan 1996 09:23:14 -0800 (PST)
Received: from austin.polstra.com (austin.polstra.com [206.213.73.10])
          by freefall.freebsd.org (8.7.3/8.7.3) with SMTP id JAA28738
          for <freebsd-current@freebsd.org>; Mon, 22 Jan 1996 09:23:11 -0800 (PST)
Received: (from jdp@localhost) by austin.polstra.com (8.6.12/8.6.12) id JAA15652; Mon, 22 Jan 1996 09:22:03 -0800
Date: Mon, 22 Jan 1996 09:22:03 -0800
From: John Polstra <jdp@polstra.com>
Message-Id: <199601221722.JAA15652@austin.polstra.com>
To: jmz@cabri.obs-besancon.fr
Subject: Re: c++ and malloc
Newsgroups: polstra.freebsd.current
In-Reply-To: <9601210225.AA20119@cabri.obs-besancon.fr>
Organization: Polstra & Co., Seattle, WA
Cc: freebsd-current@freebsd.org
Sender: owner-current@freebsd.org
Precedence: bulk

In article <9601210225.AA20119@cabri.obs-besancon.fr> you write:
> On a current system, c++ programs generate a lot of warnings. Here is
> a simple example:
> $ cat a.cc
> #include <fstream.h>
> ofstream x; main () {}
> $ c++ a.cc
> $ a.out
> Malloc warning: free(): already free chunk.
> Malloc warning: free(): already free chunk.
> Malloc warning: free(): already free chunk.

This might possibly be caused by a library problem that I caused with
a change I made to /usr/share/mk/bsd.lib.mk.  Check that file, and see
whether you have revision 1.28.  That is the bad version.  If you have
it, you should get the newest version (1.29), or revert to the preceding
version (1.27), or just apply this patch:

-------------------------------------------------------------------------------
Index: src/share/mk/bsd.lib.mk
diff -c src/share/mk/bsd.lib.mk:1.28 src/share/mk/bsd.lib.mk:1.29
*** src/share/mk/bsd.lib.mk:1.28	Tue Jan 16 16:03:08 1996
--- src/share/mk/bsd.lib.mk	Sun Jan 21 09:26:25 1996
***************
*** 1,5 ****
  #	from: @(#)bsd.lib.mk	5.26 (Berkeley) 5/2/91
! #	$Id: bsd.lib.mk,v 1.28 1996/01/17 00:03:08 jdp Exp $
  #
  
  .if exists(${.CURDIR}/../Makefile.inc)
--- 1,5 ----
  #	from: @(#)bsd.lib.mk	5.26 (Berkeley) 5/2/91
! #	$Id: bsd.lib.mk,v 1.29 1996/01/21 17:26:25 jdp Exp $
  #
  
  .if exists(${.CURDIR}/../Makefile.inc)
***************
*** 187,193 ****
  .endif
  
  .if !defined(NOPIC)
! .if !make(clean) && !make(cleandir)
  SOBJS+= ${DESTDIR}/usr/lib/c++rt0.o
  .endif
  
--- 187,193 ----
  .endif
  
  .if !defined(NOPIC)
! .if defined(CPLUSPLUSLIB) && !make(clean) && !make(cleandir)
  SOBJS+= ${DESTDIR}/usr/lib/c++rt0.o
  .endif
  
-------------------------------------------------------------------------------

Then, rebuild all of your shared libraries.  You don't have to recompile
them; just redo the final "ld" steps that build the libraries.

I don't know whether this is the cause of your problem or not; but it
might be.

-- John
-- 
   John Polstra                                       jdp@polstra.com
   John D. Polstra & Co., Inc.                Seattle, Washington USA
   "Self-knowledge is always bad news."                 -- John Barth