Dinamic Link

**PutoAmo** · 10-21-2002

Hello all.

I just have a simple question. How do I compile a function library to be accessed dinamically?

Let's say I have these 3 files:

main.c

Code:

#include "mylib.h"

int main( void )
{
 int a = 2;
 int b = 3;

 sum( a, b );
 div( a, b );

 return 0;
}

mylib.c

Code:

#include "mylib.h"

void sum( int a, int b )
{
 a + b;

 return;
}

void div( int a, int b )
{
 if ( b != 0 )
  a / b;

 return;
}

mylib.h

Code:

void sum( int, int );
void div( int, int );

What would the gcc command look like if I just wished the library to be dinamically linked.

Thanks in advance !

xlord · 10-21-2002

As far as linking.. from what i know.. you can use..
cc blah.c blah.c blah.o.... read up on the cc manuals... like the man page or something

**PutoAmo** · 10-21-2002

Thank you, xlord.

Could you, please, use the filenames I have given as examples instead of blah-files?

xlord · 10-21-2002

Code:

 cc -c main.c               /* creates file1.o */
 cc -c mylib.c               /* creates file2.o */

and for the header file...

 cc -I$PATH/include/mylib.h       /* add the directory with -I */

if im not mistaking...( lets hope im not hehe| and this is what you want..)

**xlordt** · 10-21-2002

btw.... cc -o run main.o mylib.o
will create the executable program, run

good luck

**PutoAmo** · 10-21-2002

Would that make mylib.c a dynamic library?
Will my main program and any other program using that library just load those functions needed?

**rotis23** · 10-21-2002

i think thre's a difference between static links and dynamic library links.

for example:

Code:

gcc main.c mylib.c -o output

will compile all the code staticly into one output file.

i would presume dynamic library links occur mid execution - is this right?

**PutoAmo** · 10-21-2002

That's what I also wonder about. I want mylib.c to become a dynamically linked library so I can use it with any program just loading those functions needed, when needed.Instead of linking the whole mylib.c into the executable file.

**rotis23** · 10-21-2002

just found this:

http://webclub.kcom.ne.jp/ma/colinp/win32/dll/make.html

**rotis23** · 10-21-2002

also this

http://www.mcsr.olemiss.edu/cgi-bin/man-cgi?dlopen+3

seems like dlopen is a function that can be used to link to libraries at run time.

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