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Full Discussion: Create a lib from a c program
Top Forums Programming Create a lib from a c program Post 31258 by npires on Tuesday 5th of November 2002 05:33:15 AM
Old 11-05-2002
Thank you very much for your help, I think I've got it now.

For the record ,this is a simple example of how I did it:

1) Create ut.c with the func to include in the lib

int F1( int i) {
printf("Print Nš = %d\n", i);
}

2) Complie ut.c to create ut.o

cc -c ut.c

3) Create Lib from ut.o

ar r libut.a ut.o

4) Create t1.c to invoke the func in lib

void main ( int argc, char *argv[]) {
int i_in;
if ( argc != 2) {
printf( "Wrong parameters, use : t1 <nš> \n");
return;
}
i_in = atoi( argv[1]);

F1( i_in);
}

5) Complie t1 linking it to the lib created in 3)

cc -o t1 t1.c -L: libut.a

And it Works :
>t1 69
Print Nš = 69
 

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LEARN ABOUT DEBIAN

ligcc

LIGCC(1)							 Listaller Project							  LIGCC(1)

NAME

       ligcc - Wrapper around gcc to create more portable apps

SYNOPSIS

       ligcc [OPTION ...]

DESCRIPTION

       This manual page documents briefly the ligcc command.

       ligcc is a wrapper around gcc. It allows you to create more portable executables by doing three things:

       o   Forces the linker to link against older glibc symbols. Users who are using an older version of glibc will no longer get "undefined
	   symbol GLIBC_2.4 in /lib/libc.so"-style error messages.

       o   Allows you to easily statically link to any other library.

       o   Automatically removes bogus dependancies. For example, your program uses libfoo. libfoo uses libpng internally, but your app does not.
	   Yet the pkg-config file for libfoo specifies "-lfoo -lpng" is linker parameters. And tadaa - you now have a bogus dependancy on libpng!
	   LiGCC automatically removes the -lpng for you if your app doesn't use libpng directly.

       o   Add $ORIGIN/../lib to the binary's library search path. $ORIGIN is the directory in which the binary exists. This ensures that your
	   binary can find library dependencies which are placed in the 'lib' folder under the same prefix. You might want to install custom
	   libraries into /lib. If you set $APBUILD_PROJECTNAME, ligcc will also add $ORIGIN/../lib/$APBUILD_PROJECTNAME to the library search
	   path.

OPTIONS

       See the manpage of gcc(1) for more information about possible options.

       There are also several environment variables available to modify ligcc's behavior check the documentation for more information.

SEE ALSO

       lig++ (1), gcc(1).

       Additional documentation can be found on http://listaller.tenstral.net.

AUTHOR

       This manual page was written by Matthias Klumpp matthias@tenstral.net.

COPYRIGHT

       Copyright (C) 2009-2012 Matthias Klumpp

Listaller Project						   20 April,2012							  LIGCC(1)
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