Hi all!

I want to Link a library to my program. I tried "{LinkLib gpiblib.a}". In this library it exists a function "int ibfind(char *name)". Therefor i insert the following line into my interface section in my unit: "Function ibfind(name : PChar) : LongInt; cdecl; external". I tried to use it with "nr := ibfind(device);" where nr is a LongInt and device is PChar. When i try to run the program i get the following error: "Error: undefined reference to `ibfind' "

What i am doing wrong? Could somebody help me?

I will be verry thankfull for every help i can get.

tia
Andre´

If it were Delphi code, I'd say you were missing the reference to the library you were calling ibfind from (but then again I could be wrong)

You'd need to find something in Free Pascal that does the same as:

procedure DoSomething; external 'MYLIB.DLL';
{this is straight out of Delphi's help, so it's not linux geared}

Maybe (I am guessing here, so don't assume I know what I'm talking about)

Function ibfind(name : PChar) : LongInt; cdecl; external "gpiblib.a";
// or maybe
//Function ibfind(name : PChar) : LongInt; cdecl; external "gpiblib";

That would work in Object Pascal anyway.

Hope that helps,

Matt

an> d

device is PChar. When i try to run the program i get the following error: "Error: undefined reference to `ibfind' " What i am doing wrong? Could somebody help me?

It is {$Linklib gpiblib.a}. (Maybe it's only a typo in the email)

Thanx a lot Matt!

This seems to be the right way. I changed the line to "Function ibfind(name : PChar) : LongInt; cdecl; external ´gpiblib.a´ ". The "undefined" error don´t appear annylonger. But now i get a lot of other errors like "/usr/src/linux-gpib/lib/ibFind.c(36) Error: undefined reference to `getenv' ". I think i have to set a path varable or something like that. Or must all the *.c files in the same directory with my program (but i think this could not be the answer)?
Any suggestions?

tia
Andre´

Hi Andre!

As FPC does not compile C-files I think, this error is coming from the linker.

I assume that you will need to link a few more libraries to your program to get gpiblib running. Please look in the documentation of it which libraries you have to link with a normal C program when using gpiblib. There you might need the same libs as for FPC.

Bye
Hansi

The problem is that the library you are using (ibfind) uses other libraries, and the linker can't resolve the references to those libraries.

The missing library is probably C's runtime library, so try {$linklib C} just below the other $linklib directive.

Marco van de Voort ( or )

It tried to link the library dynamicly and it isn't found when the executable is started, thus resulting in the No such file or directory message.

You can try to rename the library to 'libgpi.a' and include {$linklib gpi}.

This is again the problem that linklib doesn't know if the specified library is shared or static. Currently only shared library is supported and not the specification of a static library with it's full name. Maybe that will work with {$l gpilib.a} only. Can't test it myself.

Peter