l i n u x - u s e r s - g r o u p - o f - d a v i s
Next Meeting:
July 7: Social gathering
Next Installfest:
Latest News:
Jun. 14: June LUGOD meeting cancelled
Page last updated:
2010 Jun 08 11:41

The following is an archive of a post made to our 'vox-tech mailing list' by one of its subscribers.

Report this post as spam:

(Enter your email address)
Re: [vox-tech] inline keyword solves "undefined reference" issue
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [vox-tech] inline keyword solves "undefined reference" issue

Seems more likely that you haven't included the declarations for the C routines in your cpp file. Would need to see more context to diagnose. 

"Hai Yi" <yihai2004@gmail.com> wrote:

>Hello all:
>I created a class FFMpegMgr and a method init(); inside init() I just put
>three ffmpeg api there:
> av_register_all();
>The source file ffmpegmgr.cpp look like this:
> void FFMpegMgr::init() {
>    avcodec_register_all();
>    avdevice_register_all();
>    av_register_all();
>Now I got a "undefined reference to avcodec_register_all" error.
>if I put that body in the class declaration or add a "inline" keyword, that
>problem was gone and the compilation succeeded.
>question is, do those three functions, which are C functions defined in
>avcodec.h,  have to be used only in the inline functions in C++?
>Sorry if it appear naive - I've been out of touch with C/C++ for a while.
>vox-tech mailing list

Jeff Newmiller                        The     .....       .....  Go Live...
DCN:<jdnewmil@dcn.davis.ca.us>        Basics: ##.#.       ##.#.  Live Go...
                                      Live:   OO#.. Dead: OO#..  Playing
Research Engineer (Solar/Batteries            O.O#.       #.O#.  with
/Software/Embedded Controllers)               .OO#.       .OO#.  rocks...1k
Sent from my phone. Please excuse my brevity.
vox-tech mailing list

LUGOD Group on LinkedIn
Sign up for LUGOD event announcements
Your email address:
LUGOD Group on Facebook
'Like' LUGOD on Facebook:

Hosting provided by:
Sunset Systems
Sunset Systems offers preconfigured Linux systems, remote system administration and custom software development.

LUGOD: Linux Users' Group of Davis
PO Box 2082, Davis, CA 95617
Contact Us

LUGOD is a 501(c)7 non-profit organization
based in Davis, California
and serving the Sacramento area.
"Linux" is a trademark of Linus Torvalds.

Sponsored in part by:
Appahost Applications
For a significant contribution towards our projector, and a generous donation to allow us to continue meeting at the Davis Library.