[Flac-dev] How do I use FLAC in my C++ program ?

[Matt Zimmerman]

On Sat, Apr 13, 2002 at 02:37:33PM +1000, David Collett wrote:

> I am writing a "virtual cdplayer" application, that plays tracks from my
> cd backups, which are stored as a .flac file and a cdrwin style .cue
> file. Anyway enough of that, onto the problem..
> 
> I wish to use C++ for my program, but when I try to compile it with g++
> I get the following types of errors:
> 
> /home/dave/development/splitimg/splitimg.cpp:153: undefined reference to
> `FLAC__file_decoder_new(void)'
> /home/dave/development/splitimg/splitimg.cpp:154: undefined reference to
> `FLAC__file_decoder_set_md5_checking(FLAC__FileDecoder const *, int)'
> 
> and so on, you get the idea... its not linking to libFLAC :(
> my compile line is:
> g++ -g -o splitimg splitimg.cpp -lao -ldl -lFLAC -lm
> 
> What is going wrong here, can I use libFLAC in C++ ?

The FLAC header files need to use:

#ifdef __cplusplus
extern "C" {
#endif

[everything]

#ifdef __cplusplus
}
#endif

So that they can be used from C++ as well as C.

You can temporarily work around the problem by using extern "C" around your
#include of the FLAC headers, but this is a bug in FLAC that should be
fixed.  Fortunately, the fix is easy.

-- 
 - mdz