From mboxrd@z Thu Jan  1 00:00:00 1970
From: Tobias Ringstrom <tobias@it.chalmers.se>
To: egcs@cygnus.com
Subject: Strange warning (variable might be clobbered by `longjmp' or `vfork')
Date: Tue, 26 Aug 1997 13:14:47 -0000
Message-id: <Pine.GSO.3.96.970826125957.22253D-100000@infts7.it.chalmers.se>
X-SW-Source: 1997-08/0500.html

The following code gives a strange warning.

class ios {
public:
  virtual ~ios();
};
class istream : virtual public ios {
public:
  istream() { }
};
class ifstream : public istream {
public:
  ifstream() { }
};
void f()
{
  int maxrows=20;
  ifstream file;
  while (maxrows < 100)
    maxrows *= 2;
}

When compiling using egcs-2.90.02 (970825), I get:

~/Prog> g++ -Wall -O -c egcs-feature2.cc
egcs-feature2.cc: In function `void f()':
egcs-feature2.cc:15: warning: variable `int maxrows' might be clobbered by
`longjmp' or `vfork'

Is that correct?  If yes, I would appreciate is anyone could explain why.
The warning disappears if I move the line 'ifstream file;' before the
line 'int maxrows=20;'.

	/ Tobias