Solving "Undefined Symbol" errors

[chronozphere]

Hey FPC-people,

I've bumped into a problem. I'm trying to compile my engine on windows with FPC/Lazarus but it doesn't work. This is strange because I can do it with Delphi on Windows and with FPC on Linux.

These are my errors:

meshtestproj.lpr(244,1) Error: Illegal COFF Magic while reading G:\n3d\repo\fpc-demos\precompiled\sdl.o
meshtestproj.lpr(244,1) Error: Undefined symbol: THREADVARLIST_SDL
meshtestproj.lpr(244,1) Error: Undefined symbol: RTTI_SDL_PSDL_JOYSTICK

First of all, I would like to know what these errors mean in general. Also, what can I try to solve these?

Thanks!

[code_glitch]

Have you tried adding the -MDelpi switch to the command? It sometimes helps. What version of fpc are you using? 2.4.0 perhaps?

[chronozphere]

I use "{$MODE Delphi}" in most of my files, so I guess that means yes.

Also, I'm using Lazarus so commandline tricks don't really help (unless you can explain how to do the same thing with Laz).

[User137]

You should use latest daily snapshot for windows Lazarus. The official release is way outdated.

[chronozphere]

Ok, are you referring to these?

http://www.hu.freepascal.org/lazarus/

I might give it a try, but first I'll explore my other options. I actually don't think that this is caused by using a different version.

[grudzio]

meshtestproj.lpr(244,1) Error: Illegal COFF Magic while reading G:\n3d\repo\fpc-demos\precompiled\sdl.o

I think that this error is caused by wrong version/format of the sdl.o file. Therefore deleting it and compiling again should work.

Maybe the win and linux fpc linkers require different format of the *.o files. This would explain why it compiles only on linux. As for Delphi, if I remember correctly, it uses .dcu files, not .o so also no problem there.