This can also occur when you don't compile the program correctly. The first
response is correct:
there is no main function inside the program crt1.o. However, if crt1 is never
meant to be a "program"
(examples would be an object file or library.), then you are fine and can
ignore the message.
For example, let's say I am creating an object file (sometimes can be referred
to as a library). The object file contains popular functions that many of my other
programs use (let's say the object file is called: my_math_routines). In
my_math_routines source code I would have functions
like "Add" , "Subtract", etc.. my_math_routines will never run as a
stand-alone program (by itself).
However, other programs will call some of these functions (e.g. myprogram.c).
Therefor what I would
do is the following:
1) Compile my_math_routines.c into an object file (make math_routines.o)
2) Compile myprogram.c and link in my_math_routines.o
If in step 1 I did a "make math_routines" (notice how I left out the ".o"), it
would actually try to create a
standalone program called "my_math_routines". However, since this program does
not have a "main"
function (as stated in the e-mail below), I would receive the error you saw
(main not defined in....).
However, I know that that message is OK since I don't want a "math_routines"
program (just a mistake
in my part when I ran the "make" command in step 1.
Hope this is not too confusing and somewhat helpful.
-Jim
------------------------------
Message: 8
From: mark <[EMAIL PROTECTED]>
Organization: 24.5 Century Productions, unLtd.
To: [EMAIL PROTECTED]
Subject: Re: A c programming question?
Date: Wed, 30 Jul 2003 09:16:57 -0400
Reply-To: [EMAIL PROTECTED]
On Wednesday 30 July 2003 06:00 am,
> From: reza saeidinia <[EMAIL PROTECTED]>
> whats the following messages mean:
> /usr/lib/gcc-lib/i386-redhat-linux/2.96/crt1.o In function ''_start':
> /usr/lib/gcc-lib/i386-redhat-linux/2.96/crt1.o(.text+ox18):undefined
> refrence to 'main' thank you.
That you're trying to compile a program that has no function named main. Try
reading the book (any book, though I prefer K&R), and you'll see that every
executable C program *REQUIRES* that the top, first function that is
executed when the program runs, and which runs everything else, be named
main.
RTFM
mark
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