Oliver Mahmoudi escribió:
I compiled the library file in the following way.
% gcc -I../include -Wall -c lb.c
% ar rsv mylib.a lb.o
You can study bsd.lib.mk and bsd.prog.mk in /usr/share/mk. With these
two includes you can deal easily with your C programs/libraries. It will
serve you very well later.
The compilation finished with no warnings so I assume that there are no
errors in the library itself.
Trying to compile my source file - let's call it source.c - I always get the
following error message:
% gcc -o testfile source.c
/var/tmp//ccQoff1S.o(.text+0x19): In function `main':
: undefined reference to `myprintf'
%
That's easy, your library isn't linked to your program. First, compile
the source file but _do not link_:
gcc -c source.c
This will result in a source.o file. Then link the object files
(source.o and the static library) with ld:
ld -o testfile source.o mylib.a
In other words, gcc doesn't seem to find my library. I tried to mv my
library file in /lib, /libexec
/usr/lib, /usr/libdata and /usr/libexec but none of the above directories
would directory would
let me compile my source file.
With static libraries you can just specify the full path when linking.
Now I am wondering where do I need to put mylib.a file to succeed?
Also, this is a static library. What do I need to do under FreeBSD to
compile this library into a dynamic
library and where would I put this file?
Just using the proper parameters when compiling the library. It is a
Linux article but you'll find some explications here:
http://tldp.org/HOWTO/Program-Library-HOWTO/shared-libraries.html
Again, the bsd.*.mk Makefile includes are pretty handful.
Lastly, most if not all the system calls can be found under /sys/kern/*.c.
When writing a FreeBSD C program
gcc makes use of the corresponding headers, e.g. unistd.h. and the standard
library libc. Is it possible
to peep a look at the source file for libc, i.e. is it included in the
source tree? Where?
In /usr/src/lib/libc provided you have the source code installed in
/usr/src.
There are many many more kernel related questions on my mind but I think
that this is enought for one
email.
I don't want to desperate you but these are very basic things. You
should get a deeper knowledge of the basics first, before you try to do
some kernel-related things. Otherwise, you will find it way too
difficult and you won't enjoy. Anyway, the book of Marshall K. McKusick
and George V. Neville-Neil is a good source of learning kernel stuff:
http://www.amazon.com/Design-Implementation-FreeBSD-Operating-System/dp/0201702452
Regards,
--
Gabor Kovesdan
FreeBSD Volunteer
EMAIL: ga...@freebsd.org .:|:. ga...@kovesdan.org
WEB: http://people.FreeBSD.org/~gabor .:|:. http://kovesdan.org
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