about -fpic/-fPIC option for gcc

Ian Lance Taylor iant@google.com
Thu Sep 14 15:49:00 GMT 2006


Lin George <george4academic@yahoo.com> writes:

> Could you provide a little more information please? I
> mean what is the different things generated by -fpic
> and -fPIC in a shared library?

To make the code position independent and to permit the executable to
override symbols defined in the shared library, all global variables
are accessed via a table of addresses (the Global Offset Table, or
GOT) and all functions are called via a table of branches (the
Procedure Linkage Table, or PLT).  The dynamic linker initializes the
GOT and PLT at runtime.  The precise details depend on the platform.

Ian



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