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Path: utzoo!mnetor!seismo!columbia!rutgers!husc6!hao!boulder!sanders
From: sanders@boulder.Colorado.EDU (Bruce Sanders)
Newsgroups: comp.lang.c++
Subject: Is this a bug?
Message-ID: <731@boulder.Colorado.EDU>
Date: Thu, 11-Jun-87 13:08:13 EDT
Article-I.D.: boulder.731
Posted: Thu Jun 11 13:08:13 1987
Date-Received: Sat, 20-Jun-87 10:19:38 EDT
Organization: University of Colorado, Boulder
Lines: 71
Keywords: streams, bug, global constructors


When I compile and run the following C++ program, I get a segmentation fault.
	C++ version	<<cfront 1.2.1 2/16/87>>
	Sun OS version	3.3

// ----------------------------------------------------------------------------
#include <stream.h>

class c {
    char	*s;
public:
	c(char *string) { s = string; cerr << "constructor "; print(); }
//                                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
	void print() { cerr << s << "\n"; }
};

c global("global");

main()
{
	c local("local");
	c stat("static");
	global.print();
	local.print();
	stat.print();
}
// ----------------------------------------------------------------------------

adb gives the following output:

% adb a.out
core file = core -- program ``a.out''
SIGSEGV 11: segmentation violation
$c
__ostream__lshiftFPC__(0x20d60,0x20071) + 30
__STIjnk_c_() + 24
__main() + 14
_main(0x1,0xefffbbc,0xefffbc4) + e


If I comment out the two lines with "global" in them, everything works,
producing the following output:

% a.out
constructor local
constructor static
local
static

Alternatively, if I remove the cerr and print statements (indicated in
the comment) from the constructor, it works correctly, producing

% a.out
global
local
static

Is this a bug, or am I doing something illegal?

thanks
bruce

Bruce W. Sanders
Department of Computer Science
University of Colorado
Campus Box 430
Boulder, CO 80309-0430

(303) 492-8118

sanders@boulder