Ok, you're in luck.
From
http://users.actcom.co.il/~choo/lupg/tutorials/libraries/unix-c-libraries.html
Creating A Shared "C" Library Using "ld"
The creation of a shared library is rather similar to
the creation of a static library. Compile a list of
object files, then insert them all into a shared
library file. However, there are two major
differences:
Compile for "Position Independent Code" (PIC) - When
the object files are generated, we have no idea where
in memory they will be inserted in a program that will
use them. Many different programs may use the same
library, and each load it into a different memory in
address. Thus, we need that all jump calls ("goto", in
assembly speak) and subroutine calls will use relative
addresses, and not absolute addresses. Thus, we need
to use a compiler flag that will cause this type of
code to be generated.
In most compilers, this is done by specifying '-fPIC'
or '-fpic' on the compilation command.
Library File Creation - unlike a static library, a
shared library is not an archive file. It has a format
that is specific to the architecture for which it is
being created. Thus, we need to use the compiler
(either the compiler's driver, or its linker) to
generate the library, and tell it that it should
create a shared library, not a final program file.
This is done by using the '-G' flag with some
compilers, or the '-shared' flag with other compilers.
Thus, the set of commands to we will use to create a
shared library, would be something like this:
cc -fPIC -c util_file.c
cc -fPIC -c util_net.c
cc -fPIC -c util_math.c
cc -shared libutil.so util_file.o util_net.o
util_math.o
The first three commands compile the source files with
the PIC option, so they will be suitable for use in a
shared library (they may still be used in a program
directly, even thought they were compiled with PIC).
The last command asks the compiler to generate a
shared library .
See if this works for you.
Arup
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