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From: mouse@lightning.mcrcim.mcgill.EDU
Newsgroups: comp.windows.x
Subject: Re:  Help: C++ & X programming
Message-ID: <9101271131.AA10851@lightning.McRCIM.McGill.EDU>
Date: 27 Jan 91 11:31:33 GMT
Sender: daemon@athena.mit.edu (Mr Background)
Organization: The Internet
Lines: 37

> I am trying to write a C++ program of an X-window application.  The
> makefile for the program is at the end of this message.
> Unfortunately, it produces the following error message.

> > make
> g++ -Wall -g -o gb -lXaw -lXmu -lXt -lX11
> crt0.c:731: Undefined symbol _main referenced from text

> Could you please let me know what is wrong with my makefile?

[relevant excerpt from Makefile]
> gtest: 
> 	g++ $(C_FLAG) -o $@ $(LIB)

This really is not an X problem; this is a basic compiler and/or make
use problem.

With the command I have quoted,

	g++ -Wall -g -o gb -lXaw -lXmu -lXt -lX11

you are telling g++ to link your object files together to form an
executable called gb.  However, you aren't giving it any object files
to link together!  Hardly surprising it doesn't like you.

I don't quite know where the gb is coming from; $@ is supposed to be
the target name, which would be gtest in this case.

As a first guess at what you intend to do, I would propose

> gtest: $(OBJ)
> 	g++ $(C_FLAG) -o $@ $(OBJ) $(LIB)

					der Mouse

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			new: mouse@larry.mcrcim.mcgill.edu