Re: [Plib-users] error with gcc after including fnt header

[John F. <joh...@cy...>]

Victor,

     Hello and welcome to the PLIB community.  I wish you a good a 
productive time here.

     The basic problem is that your program is written in C (the ".c" 
extension means that GCC will use the C compiler on it) while PLIB is 
written in C++.  To give one example, if you will look in the file 
"sg.h" (in the "src/sg" directory) on lines 436 and 457 you will find 
two definitions of the function "sgScaleVec3".  They have different 
argument lists; C++ is able to distinguish between them based on the 
argument lists, but C is not.

     Unfortunately there isn't much to do about it beyond redoing your 
program in C++.  You may not need to redo the entire program (depending 
on its size), but any part that uses a PLIB library will need to be in 
C++.  You could write a wrapper function in a separate file with a 
".cxx" or ".cpp" or ".cc" extension and preface your function 
definitions with the string

         extern "C"

which will tell the C++ compiler that these functions will be called 
from C language functions.

         - John

On 1/28/2011 11:08 PM, Victor henri wrote:
> Hello
>
> I would like to use *plib fnt* to use some text, in a 3D spectral 
> analysis of the sound that works fine already (openGL in a SDL window).
>
> The problem is : when I add the include file *#include <plib/fnt.h>*,i 
> get a huge error message that i've attached in a file (it is so big 
> that I don't even have the beginning in my terminal).
>
> I'm on ubuntu Maverick 10.10 64 bits; plib hab been installed from the 
> official packages (i've installed the libplib-dev package also);
>
> I compile my program with that command :
>
> *gcc -o Spectrum `pkg-config gstreamer-0.10 --cflags --libs` 
> `pkg-config gtk+-2.0 --cflags --libs` `sdl-config --cflags --libs` 
> -lGLU -lGL -lglut -lplibfnt -lplibsg  -lglut -L/usr/X11/lib -lX11 
> -lXext -lXmu -lm `pkg-config jack --cflags --libs` myProgram.c*
>
> Before I add the fnt header,the compilation is succesfull with this 
> command; it's only after adding the fnt.h that problems arrive; i 
> understand that it is not necessary to include the sg header for it is 
> called by the fnt (anyway i've trid that also).
>
> Could please anyone give me a clue?
>
> Thank you
>
> Victor
>
>
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