Re: illegal instruction with Open Ski Jumping + Debian unstable

[Falk Hueffner <hueffner@informatik.uni-tuebingen.de>]

Michal Brzozowski <rusolis@poczta.fm> writes:

> My friend is trying to run my game on his Debian unstable box
> without success.  It compiles fine, but he gets an "Illegal
> instruction" whenever the game tries to run functions that draw 3d
> graphics.  The library that I use for graphics and other things is
> Allegro (http://alleg.sf.net).  After hours of debugging we haven't
> found any bugs in the source code, and we only found out that the
> game crashes at the first try of drawing anything in 3d.  This means
> the functions "apply_matrix_f()", "clip3d_f()" and
> "persp_project_f()" from Allegro.  I wasn't able to reproduce the
> bug on my machine (Debian stable), nor did I hear of anybody else
> having this problem.  I still don't know where exactly the bug lies
> (my game, Allegro, gcc, ...), so I'm asking you guys for help.
> Maybe you can at least tell me what might cause an "Illegal
> instruction"?

Usually, either an indirect jump using a corrupted pointer; or a
binary compiled for a CPU that has more features than that running the
binary. Usually, you can find that out by running the program under
gdb and using "disas".

-- 
	Falk