Date: Wed, 2 Aug 1995 13:31:46 +0300 (IDT)
From: Eli Zaretskii <eliz AT is DOT elta DOT co DOT il>
To: michael DOT wesolowski AT canada DOT cdev DOT com
Cc: djgpp AT sun DOT soe DOT clarkson DOT edu
Subject: Re: problems linking C++


On 31 Jul 1995 michael DOT wesolowski AT canada DOT cdev DOT com wrote:

> I am attempting to compile a simple 'hello, world' type program
> in C++ using DJGPP v 1.12, with all 4 maintenance releases installed.
> based upon the verbose output from the compiler, it appears to be
> failing during the link phase with the following errors:
> 
> .... undefined reference to cout
> ....undefined reference to ostream::operator << (char const *)
> 

Please read the DJGPP FAQ list (available as faq102.zip from the same 
place you get DJGPP) which says thusly:

8.8   Q: When I compile my program, the linker complains about mathematical
         functions, although I did #include <math.h>.
      Q: The linker complains it cannot find cprintf function.
      Q: Why do I get so many unresolved symbols when linking C++ programs?
      A: By default, gcc instructs the linker to only look in two libraries:
         libgcc.a and libc.a.  Some functions aren't included there, so the
         linker can't find them.  For math functions, like sin() and exp(),
         append ``-lm'' to the gcc command line; for pc-specific
         functions, like cputs() and cprintf() append ``-lpc''; to use C++
         classes append ``-lgpp''.  GPL library routines, like obstack and
         regex packages are in libgpl.a library; append ``-lgpl'' to use
         them.

         Note that some C++ classes use math routines, so the -lm should
         be given after the -lgpp.

There are more sections in the FAQ about this issues; I'd recommend you 
to read them also.