more cygwin problems

[John W. Eaton]

Can someone who has an up to date Cygwin installation check to see
whether the following program fails?  You can compile it with

  g++ cygwin-bug.cc

It should print

  toit: throwing exception
  toit: caught exception
  doit: throwing exception
  main: caught exception

when you run it.  For me, with the latest Cygwin packages and either
gcc 3.3 or 3.4, it fails at the point of throwing the second
exception, so it prints

  toit: throwing exception
  toit: caught exception
  doit: throwing exception

followed by a segfault.

This bug also shows up for me when I compile Octave.  In that case, I
see a segfault if I type Ctrl-C at the command prompt.

Thanks,

jwe

#include <setjmp.h>

#include <iostream>

jmp_buf context;

class
exception
{
  // empty;
};

static void
toit (void)
{
  try
    {
      std::cerr << "toit: throwing exception" << std::endl;
      throw exception ();
    }
  catch (exception)
    {
      std::cerr << "toit: caught exception" << std::endl;
      longjmp (context, 1);
    }
}

static void
doit (void)
{
  if (setjmp (context) == 0)
    {
      toit ();
    }
  else
    {
      std::cerr << "doit: throwing exception" << std::endl;
      throw exception ();
    }
}

int
main (void)
{
  try
    {
      doit ();
    }
  catch (exception)
    {
      std::cerr << "main: caught exception" << std::endl;
    }

  return 0;
}