Irrlicht Engine

Whats supposed to accomplish in the main.cpp in the demo package ?

#pragma comment is a VC++ compiler directive used to specify linker options.

Basically, including that line of code is equivalent to adding all of the Irrlicht code files to your project. The .lib is the precompiled version.

Ya, but if you're trying to compile it with anything OTHER than vc it would cause the resulting program to fail (through having linked the wrong libraries).

So basically, all the problems people with dev-cpp have been having (I've seen a few people complaining they can't compile the examples on the forum) could really be traced back to this directive ?

Not all of them, but probably most of the linker error issues.

The pragma is simply ignored by other compilers, the errors people have with other IDEs are simply due to wrong usage of the tools