From: un1t AT rz DOT uni-karlsruhe DOT de (Matthias Baas)
Newsgroups: comp.os.msdos.djgpp
Subject: throw,catch,try problem
Date: Tue, 14 Jan 1997 19:02:42 GMT
Organization: University of Karlsruhe, Germany
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To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp

Hi,

I have a problem with the C++ exception handling mechanism supported
by djgpp V2.7.2.1. The problem occurs when I try to throw an exception
that I do not catch. Documentations tell me that in this case the
exception handling mechanism calls the terminate() function. Then
this function calls the most recent function that was given to
set_terminate().
But as I wanted to test this feature the program terminated with the
message "Abort!" and without executing my own termination function.
I used the following code:

#include <iostream.h>

void term()         // my own termination function
{
  cout<<"Terminate()"<<endl;
  abort();
}

int main()
{
  set_terminate(term);

  try {
    throw int(5);   // just throwing anything I do not catch
  }

  return 0;
}

I compiled the program (called "test.cc") with:
gcc test.cc -lgpp -lstdcx -fhandle-exceptions

I also tried the same program under Linux with:
gcc bspl1.cc -lg++ -fhandle-exceptions

And here everything worked fine, the program terminated with the
message "Terminate()".

So what's wrong with djgpp or what's wrong with my code?
And why do I have to add the -lstdcx option when I use djgpp? 
I assumed that the libraries on the different platforms contain at
least the same functions.

I hope someone can help...

- Matthias -

PS: Looking at the file sizes of the DOS- and Linux executables of
    the above program made me a bit uneasy. I stripped both files,
    but while the Linux file shrinked to a handsome 5KB file, the
    DOS executable still needs about 100KB !
    Is there a reasonable explanation for this?
    I was just wondering...