Path: utzoo!utgpu!news-server.csri.toronto.edu!eecg.toronto.edu!zq
Newsgroups: comp.lang.c++
From: zq@eecg.toronto.edu (Qing Zheng)
Subject: Buggs in AT&T C++ 2.0 ?
Message-ID: <1991Jan12.174410.9491@jarvis.csri.toronto.edu>
Distribution: comp
Date: 12 Jan 91 22:44:10 GMT
Lines: 118


Hi,
  
  I found the initialization sequence of classes with static member
variables is depended on the link sequence. At the end of this mail. I
include a shell archive containing three files : base.h base.C, and
main.C. They will show the case I mentioned above.
  I'm using AT&T C++ 2.0 under SunOS 3.5. If I compile this way :
	%CC main.C base.C
	%a.out

The output is :
    myInt::myInt()
    base::base()   No = 1
    base::base()   No = 2
    No = 2

However, If I compile the other way, 
	%CC base.C main.C
	%a.out

The output is
    base::base()   No = 1
    base::base()   No = 2
    myInt::myInt()
    No = 0

	Why are the two outputs different ?


	Qing	zq@eecg.toronto.edu

P.S.   If you combine these three files into one file, there is no problem.

-------------CUT HERE ----------
#! /bin/sh
# This is a shell archive.  Remove anything before this line, then unpack
# it by saving it into a file and typing "sh file".  To overwrite existing
# If this archive is complete, you will see the following message at the end:
#		"End of shell archive."
#
# Contents:
#   base.h base.C main.C
#
# Wrapped by zq@eecg.toronto.edu on Sun Dec 23 18:20:23 1990
#
PATH=/bin:/usr/bin:/usr/ucb ; export PATH
if test -f base.h -a "${1}" != "-c" ; then 
  echo shar: Will not over-write existing file \"base.h\"
else
echo shar: Extracting \"base.h\" \(299 characters\)
sed "s/^X//" >base.h <<'END_OF_base.h'
X#include <stream.h>
X
Xstruct	myInt {
X    int	no;
X    myInt();
X    void    inc()   {	no++;				}
X    void    print() {	cerr << "No = " << no << "\n";	}
X};
X
Xclass	base {
Xprivate :
X    static  myInt   number_of_objects;
Xpublic :
X    static  void    print() {	number_of_objects.print();  }
X    base();
X};
END_OF_base.h
if test 299 -ne `wc -c <base.h`; then
    echo shar: \"base.h\" unpacked with wrong size!
fi
# end of overwriting check
fi
if test -f base.C -a "${1}" != "-c" ; then 
  echo shar: Will not over-write existing file \"base.C\"
else
echo shar: Extracting \"base.C\" \(218 characters\)
sed "s/^X//" >base.C <<'END_OF_base.C'
X#include <stream.h>
X#include "base.h"
X
XmyInt::myInt()	{  cerr << "myInt::myInt()\n"; no = 0;  }
X
XmyInt	base::number_of_objects;
Xbase::base()
X{
X    number_of_objects.inc();
X    cerr << "base::base()   ";
X    print();
X}
END_OF_base.C
if test 218 -ne `wc -c <base.C`; then
    echo shar: \"base.C\" unpacked with wrong size!
fi
# end of overwriting check
fi
if test -f main.C -a "${1}" != "-c" ; then 
  echo shar: Will not over-write existing file \"main.C\"
else
echo shar: Extracting \"main.C\" \(61 characters\)
sed "s/^X//" >main.C <<'END_OF_main.C'
X#include "base.h"
X
Xbase	a, b;
X
Xmain()
X{
X    base::print();
X}
END_OF_main.C
if test 61 -ne `wc -c <main.C`; then
    echo shar: \"main.C\" unpacked with wrong size!
fi
# end of overwriting check
fi
echo shar: End of shell archive.
exit 0