Message-Id: <199809040053.UAA00547@delorie.com>
Comments: Authenticated sender is <mert0407 AT sable DOT ox DOT ac DOT uk>
From: "George Foot" <george DOT foot AT merton DOT oxford DOT ac DOT uk>
To: Jason <jpsaave AT sandia DOT gov>
Date: Fri, 4 Sep 1998 01:51:15 +0000
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Subject: Re: Why doesn't C++ work!?!?!
Reply-to: mert0407 AT sable DOT ox DOT ac DOT uk
CC: djgpp AT delorie DOT com
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On  3 Sep 98 at 15:41, Jason wrote:

> Hey guys:
> 
> I have not been able to get any C++ programs compiled - and on the DJGPP
> website, it says that gcc should know what to to with the file according
> to the file's extenstion.  

It does.  However, for most C++ programs you need to link in the 
standard C++ library (or at least part of it).  See below.

> I tried to compile a simple C++ program that
> couts one line (it looks like this):
> 
> #include <iostream.h>
> 
> main(void)
> {
> cout << "This is a test.";
> }
> 
> (Simple enough?!?) it seemed to treat it like a C source.  Here is some
> sample output:
> 
> d:/dgjpp/tmp\ccca2vyh(.text+0x21):cpptest.cpp: undefined reference to
> 'cout'
> d:/dgjpp/tmp\ccca2vyh(.text+0x26):cpptest.cpp: undefined reference to
> 'ostream::operator<<(char const *)'
> 
> What I get from this is it's not even recognizing the 'cout' command! 
> gcc works perfectly fine with C sources (*.c), but it has this same
> problem with *.cpp and *.C .  Anyone else had this problem?  Help me! 
> :O)

I don't play with C++ much, but try some of the following:

    gxx foo.cpp -o foo.exe
or
    gcc foo.cpp -o foo.exe -liostr (maybe `-liostream' these days)
or
    gcc foo.cpp -o foo.exe -lstdcx (`-lstdcxx' if you use gcc v2.8.1)

The first one is the normal one to use; you need to use `gxx' instead 
of `gcc' whenever you are producing a .exe file from a C++ program.  
So when you're compiling and linking separately, compile with `gcc':

    gcc -c foo.cpp

but link using `gxx':

    gxx foo.o -o foo.exe

If you're compiling and linking all in one step, just use `gxx' as I 
originally did above.

This is documented in readme.1st, which you should read.

-- 
george DOT foot AT merton DOT oxford DOT ac DOT uk