Creating and Using Libraries

Creating Shared Libraries

Creating Shared Libraries

Two steps are required to create a shared library:

1.“Creating Position-Independent Code (PIC)” by compiling with +z.

2.“Creating the Shared Library with ld” by linking with -b.

Shown below are the commands you would use to create a shared library called libunits.sl:

$ cc -Aa -c +z length.c volume.c mass.c

$ ld -b -o libunits.sl length.o volume.o mass.o

Other topics relevant to shared libraries are:

•“Shared Library Dependencies”

•“Updating a Shared Library”

•“Version Control with Shared Libraries”

•“Shared Library Location”

•“Improving Shared Library Performance”

Creating Position-Independent Code (PIC)

The first step in creating a shared library is to create object files containing position-independent code (PIC). There are two ways to create PIC object files:

•Compile source files with the +z or +Z compiler option, described below.

•Write assembly language programs that use appropriate addressing modes, described in Chapter 7, “Position-Independent Code,” on page 259.

In 32-bit mode, the +z and +Z options force the compiler to generate PIC object files. In 64-bit mode, the +Z option is the default.

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