Create shared library

[Patrick Chim]

Hi,

How can I implement a C program to a shared library so that any other C program can call the function in the shared library ?

Regards,
Patrick

[glenn henley]

If I understand your question correctly
a compiler line something like :-

aCC -b +z -o main.sl main.cpp

should suffice

[Patrick Chim]

Hi,

How can I compile another program with this shared library ? Can you show the command line for me ?

Regards,
Patrick

[glenn henley]

Here's about the most simplistic example
I can come up with.... normally I'd have
stuff like this in a makefile.

stuff.h
-------
#include
void out();

stuff.cpp
---------
#include "stuff.h"
void out()
{
printf("Hello world\n");
};

main.cpp
--------
#include "stuff.h"
int main()
{
out();
return 1;
}

..and then to actually build the things
---------------------------------------

1) aCC -b +z -o libStuff.sl stuff.cpp
2) aCC -L./ -lStuff -o main main.cpp

-L indicates where 'Stuff' lives
-l is the library name, the lib & .sl
gets wrapped around it.

I think that's it.... just make sure if you
try this example everything lives in the
same directory.

Best 'o Luck

Glenn

[Patrick Chim]

Hi glenn,

My system running HP-UX 11.0 and use the cc compiler come from HP. I replace the aCC with cc but it say it does not have the -b option. Do you know how to compile in my environment ?

And, can I add the shared library in a search path ? If so, what environment variable can I set ?

Many thanks,
Patrick

[Klaus Crusius]

Hi,

with the ANSI-C compiler (the bundled cc compiler which comes with HPUX does not support Positin Independant Code), the procedure would be :

cc +z -c -o sub.o sub.c
ld -b sub.o libxxx.sl
mv libxxx.sl $instdir

cc -L $instdir main.c -o main

Regards, Klaus

[Blanche · Accepted solution]

to create your library

for each source file :
cc +z -c file.c

and then
ld -b -o libmylib.sl file1.o file2.o ....

to use it in building an executable :
cc -L. -lmylib -o myexec myexec.c

you should set the SHLIB_PATH environment variable
when you launch the program.

Blanche

[Blanche]

Sorry I fogot an option to use the SHLIB_PATH variable at run-time

the right compilation line is :
cc -Wl,+s -L. -lmylib -o myexec myexec.c

Blanche