Hi,

I am having three files similar to the stucture given below, while i
execute my test.c, it show error /test.c:5: undefined reference to
`myfunction'.
I have included myprogram.h in both the files myprogram.c and test.c.

if i comment out the line myfunction from myfunction.h, then it is
working properly. Is it multiple definition error?
i compile the files as
cc -c myprogram.c -o myprogram
cc -c test.c -o test
cc -o test test.o my

Thanks in Advance!


/******* myprogram.c *******/

#include "myprogram.h"
myfunction()
{
}


/******* myprogram.h *******/

myfunction();


/******** test.c *********/
#include "myprogram.h"
int main()
{
myfunction();
}

rayuthar@gmail.com wrote:
> Hi,
>
> I am having three files similar to the stucture given below, while i
> execute my test.c, it show error /test.c:5: undefined reference to
> `myfunction'.
> I have included myprogram.h in both the files myprogram.c and test.c.
>
> if i comment out the line myfunction from myfunction.h, then it is
> working properly. Is it multiple definition error?
> i compile the files as
> cc -c myprogram.c -o myprogram
> cc -c test.c -o test
> cc -o test test.o my
>
Where's myprogram in the line above?

>
> /******* myprogram.h *******/
>
> myfunction();
>
Don't use implicit it return, please.



--
Ian Collins.

rayuthar@gmail.com said:

> Hi,
>
> I am having three files similar to the stucture given below, while i
> execute my test.c, it show error /test.c:5: undefined reference to
> `myfunction'.
>
> I have included myprogram.h in both the files myprogram.c and test.c.
>
> if i comment out the line myfunction from myfunction.h, then it is
> working properly. Is it multiple definition error?

No - your code has some issues, but it isn't the showstopper in this case.
Rather, it's the way you're invoking the linker.

> i compile the files as
> cc -c myprogram.c -o myprogram
> cc -c test.c -o test
> cc -o test test.o my

This can't work, for any reasonable definition of "work".

I suggest you change it, for the time being, to:

cc -c myprogram.c myprogram.o
cc -c test.c -o test.o
cc -o myprogram test.o myprogram.o

<snip>

--
Richard Heathfield <http://www.cpax.org.uk>
Email: -http://www. +rjh@
Google users: <http://www.cpax.org.uk/prg/writings/googly.php>
"Usenet is a strange place" - dmr 29 July 1999

Richard Heathfield <rjh@see.sig.invalid> writes:
> rayuthar@gmail.com said:
[...]
>> i compile the files as
>> cc -c myprogram.c -o myprogram
>> cc -c test.c -o test
>> cc -o test test.o my
>
> This can't work, for any reasonable definition of "work".
>
> I suggest you change it, for the time being, to:
>
> cc -c myprogram.c myprogram.o
> cc -c test.c -o test.o
> cc -o myprogram test.o myprogram.o

You missed the "-o" on the first line.

For that matter, the first two commands can be simplified by using the
default output file name:

cc -c myprogram.c
cc -c test.c

though the "-o" does show more explicitly what's going on.

Note that this is about a particular implementation, not about C.
For more details, consult your system's documentation for the "cc"
command, or ask in comp.unix.programmer.

--
Keith Thompson (The_Other_Keith) <kst-u@mib.org>
Nokia
"We must do something. This is something. Therefore, we must do this."
-- Antony Jay and Jonathan Lynn, "Yes Minister"

Keith Thompson said:

<snip>

> You missed the "-o" on the first line.

So I did.

--
Richard Heathfield <http://www.cpax.org.uk>
Email: -http://www. +rjh@
Google users: <http://www.cpax.org.uk/prg/writings/googly.php>
"Usenet is a strange place" - dmr 29 July 1999

On Apr 14, 11:04 pm, Richard Heathfield <r...@see.sig.invalid> wrote:
> Keith Thompson said:
>
> <snip>
>
> > You missed the "-o" on the first line.
>
> So I did.
>
> --
> Richard Heathfield <http://www.cpax.org.uk>
> Email: -http://www. +rjh@
> Google users: <http://www.cpax.org.uk/prg/writings/googly.php>
> "Usenet is a strange place" - dmr 29 July 1999

Thanks to everyone! But i found out the problem and fault was mine. i
was trying to invoke a static function from another c file!