linking own library

bobby2k3 · 10-20-2003, 08:04 AM

I have created a own library using " ranlib " in UNIX ...

i have got a " libmymath.a" library ... i tried to use it ina program

named " prog.c " .. but it is not working..

iam using ...

gcc -o prog -L. -mymath prog.o

It is giving an error that the functions used are not found...

should i give any header file or so in the program to use my own l

library ???

-- awaiting reply --

--thanx in advance --

Hko · 10-20-2003, 10:30 AM

Quote:

gcc -o prog -L. -mymath prog.o

Put a "l" (lowercase "L") just before "mymath", like this:
gcc -o prog -L. -lmymath prog.o

Hko · 10-20-2003, 10:36 AM

Quote:

It is giving an error that the functions used are not found...
should i give any header file or so in the program to use my own l
library ???

Having a header file probably wouldn't prevent the error you mention, but if you call functions in you source from another file (like another .o file or a lib) you (almost allways) need a function prototype which are usually in a header. You can provide a prototype for the external function in the source itself, but then it wouldn't make sense to have a library.

So, in short: yes, you need a header file. But I don't think that's solves the problem you describe.