about -fpic/-fPIC option for gcc

Lin George george4academic@yahoo.com
Sun Sep 17 08:53:00 GMT 2006


Thank you Marcelo,


Your answer makes me clear about how to use them. I
have a further question, I am wondering what are the
differences (could you provide a little more
information) of the code generated by -fpic/-fPIC? Do
you mean there are any differences in some tables
which linker or something else will ues?


regards,
George

--- Marcelo Slomp <mslomp@linuxmail.org> wrote:

> 
> 
> Lin George wrote:
> > 
> > Hello everyone,
> > 
> > 
> > I am confused about the meaning and function of
> -fpic
> > and -fPIC option of gcc. I am more confused when
> after
> > reading the manual of gcc (for example, what means
> > PIC, GOT, constant addresses, etc.). Could anyone
> > explain to me what are their functions in easy to
> > understand words?
> > 
> > Here are the descriptions from gcc manual, which
> makes
> > me confused. :-)
> > 
> 
> While -fpic is platform-dependent, -fPIC works
> always, but generates much
> more code than -fpic does.
> In practice, using an non-technical language, -fPIC
> will generate a code
> capable to see things beyond
> the normal scope, so that system can map the
> (position independent) code in
> any case.
> The rule is: if you want a fast and small code, and
> the target is
> pic-enabled, use -fpic.
> Otherwise, avoid headhaches using -fPIC always.
> 
> Regards,
> Marcelo Slomp
> -- 
> View this message in context:
>
http://www.nabble.com/about--fpic--fPIC-option-for-gcc-tf2209766.html#a6308284
> Sent from the gcc - Help forum at Nabble.com.
> 
> 


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