Hi,

is it possible to link FPC compiled units to a C program on Linux? I'm not able to figure it out.
FPC uses some strange way to name symbols and whatever I try, I always end up with the linking errors.
I'm probably doing some trivial error, but I just can't find it.

Simple function:

function aplusb(a,b:longint):longint;cdecl;

gets exported as something like:

text.n_testunit_aplusb$longint$longint$$longint

Any help appreciated. (And I need the same on Windows later, I just didn't get there yet).

VK

It's normal name mangling, just like C++ also does. To force a specific name try something like this:

function aplusb(a,b:longint):longint;cdecl name '_aplusb';

Hi a thank you for quick reply, but I've tried that before:

Fatal: Syntax error, ";" expected but "identifier NAME" found

Could it be mode dependant? (I use -Mobjfpc)

V.

Add "export;" at the end of the declaration, then it will also get an unmangled symbol name (but only because it's declared as cdecl). And please do not follow the other advice you got about manually adding an alias, because C name mangling differs from platform to platform and hence the name you'd specify would only work on some platforms.

Jonas

try:

function aplusb(a,b:longint):longint;cdecl; external name '_aplusb';

I probably just found a way!

alias '_aplusb';

Ah, sorry, that would be for the other direction =)

This one should work:

function aplusb(a,b:longint):longint;cdecl; public name '_aplusb';

YES! Thank you very much. You saved my day (maybe more of them, if I had to rewrite all the pascal code to C) :)