Re: [Libcdio-help] Undefined references on compilation

[Rocky Bernstein]

The error messages indicate that you did not link with the libcdio library.

If the command 
   pkg-config libcdio --libs

works and returns something, then add that string on to the ld command (which is usually done under the covers say from gcc). Here's an example:

> $ pkg-config libcdio --libs
> -L/usr/local/lib -lcdio -lm  
> $ cd llibcdio/example/
> $ ls
> audio.c ...
> $ gcc audio.c `pkg-config libcdio --libs` -o audio
> $

If pkg-config isn't around, then locate where libcdio.a library archive exists on your computer. And give that as file in the linking. Here's an example of that, again using gcc as an example

 $ locate libcdio.a
/usr/local/lib/libcdio.a
..
$ gcc audio.c  /usr/local/lib/libcdio.a -o audio
$

In the example above  -L /usr/local/lib and -lcdio would also work.

On Mon, Aug 9, 2010 at 5:22 PM, Trevor Vallender <address@hidden> wrote:

Sorry this is a bit of a basic question I think, but I'm using libcdio
in my first real C app.

I am trying to compile the second example from the documentation, have
used #include <cdio/cdio.h>, but when I compile I receive:

/tmp/ccGMMKAB.o: In function `main':
cdio.c:(.text+0x19): undefined reference to `cdio_open'
cdio.c:(.text+0x30): undefined reference to `cdio_get_driver_name'
cdio.c:(.text+0x4d): undefined reference to `cdio_get_default_device'
cdio.c:(.text+0x6a): undefined reference to `cdio_destroy'
cdio.c:(.text+0x8e): undefined reference to `cdio_have_driver'
cdio.c:(.text+0x9e): undefined reference to `cdio_driver_describe'
cdio.c:(.text+0xbd): undefined reference to `cdio_driver_describe'
collect2: ld returned 1 exit status

What am I doing wrong? Is there some extra option I must pass to gcc?

Regards,
Trevor Vallender



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