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Old 06-19-2004, 12:37 PM   #1
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Registered: May 2004
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c++ programming: including headers from external libraries

I'm pretty new to c++ and although i'm beginning to understand the language itself quite well i still have some problems with the following..

I'm trying to create a simple xml reader using the libxml c++ wrapper library libxml++. To include those classes i use the following include statement:

#include "libxml++.h"

and when compiling i use:

g++ -o test test.cpp -I /usr/include/libxml++-2.6/libxml++/

and the directory contains the needed libraries.

Even if i by mere chance would get this to work, I still don't know the theory requiered to make the most of it.. Can you point me in the right direction.. I guess there must be a good HOWTO somewhere on the internet, i just haven't been able to find it

Generally speaking, when trying to utilize external libraries, how should one go about including the headers?

Old 06-19-2004, 12:51 PM   #2
Registered: Aug 2002
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Well, to start off with, the argument to g++ is "-I/some/include/path not" "-I /some/include/path".

Allot of libraries have there own configuration script. For example, with SDL, you go like this to get the right paths and library links:

g++ `sdl-config --cflags --libs` -o mysdlprog mysdlprog.cpp

Gtk has a similar program called "gtk+-2.0-config"... I think thats what it is anyway.
All these scripts do is print the flags for gcc to stdout. Try it, at the commandline just type "sdl-config --cflags" and push enter, you'll see what I mean. If the library doesn't have a script like this, then you have to rely on the person compiling it to have the right paths set. So you usually just link "-lsomelib" and the person compiling will have to make sure the paths point to "".

You should still try to use system defualts however, that way you will have a better chance of it compiling without any headaches on more systems. Example, instead of "#include <gl.h>" for OpenGL, you should always "#include <GL/gl.h>", since that is the standard for OpenGL.
Old 06-19-2004, 01:42 PM   #3
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Problem solved.

Thanks for the help. It's working perfectly now.
Old 07-20-2004, 08:06 AM   #4
Registered: Apr 2004
Location: Portugal
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Hi, i'm new to linux and opengl.
I've been trying to compile a program i made with sdl and opengl (don't know if it works or not).
to compile I use:

gcc program.c `sdl-config --cflags --libs`

but it gives an error in all of the opengl lines of code. i think it is bad referenced libraries. (Sorry not to post the error messages, i'm not at home)

should i add something like `gl-config` or something like that ??


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