To create a shared library, the following steps must be performed:

  1. Compile source modules with +z or +Z flag to create a .o module
     which contains Position-Independent Code (PIC).  The linker will
     tell you in the next step if +Z was needed.
     (For gcc, the appropriate flag is -fpic or -fPIC.)

  2. Link the shared library using the -b flag.  If the code calls
     any functions in other system libraries (e.g., libm), it must
     be included on this line.