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Date: Tue, 23 May 2006 19:35:00 -0000
From: Jason Lam <jlam555@yahoo.com>
Subject: Re: Linking un-referenced function
To: John Carter <john.carter@tait.co.nz>
Cc: gcc-help@gcc.gnu.org
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Thanks for the quick response, John.

It looks like these options will arrange the functions
to different sections in the final image but it still
doesn't exclude them.  Am I missing something?

Thanks,

Jason

--- John Carter <john.carter@tait.co.nz> wrote:

> On Mon, 22 May 2006, Jason Lam wrote:
> 
> > I looked through the documents and couldn't find
> an
> > option to not link an un-referenced function into
> the
> > final image.  Does GCC support it?  Could someone
> > please help?
> 
> Sorry, I got confuddled...
> 
> Use
>    `--gc-sections'
> option on linker and...
> 
> 
> `-ffunction-sections'
> `-fdata-sections'
>       Place each function or data item into its own
> section in the output
>       file if the target supports arbitrary
> sections.  The name of the
>       function or the name of the data item
> determines the section's name
>       in the output file.
> 
>       Use these options on systems where the linker
> can perform
>       optimizations to improve locality of reference
> in the instruction
>       space.  Most systems using the ELF object
> format and SPARC
>       processors running Solaris 2 have linkers with
> such optimizations.
>       AIX may have these optimizations in the
> future.
> 
>       Only use these options when there are
> significant benefits from
>       doing so.  When you specify these options, the
> assembler and
>       linker will create larger object and
> executable files and will
>       also be slower.  You will not be able to use
> `gprof' on all
>       systems if you specify this option and you may
> have problems with
>       debugging if you specify both this option and
> `-g'.
> 
> 
> John Carter                             Phone :
> (64)(3) 358 6639
> Tait Electronics                        Fax   :
> (64)(3) 359 4632
> PO Box 1645 Christchurch                Email :
> john.carter@tait.co.nz
> New Zealand
> 
> Carter's Clarification of Murphy's Law.
> 
> "Things only ever go right so that they may go more
> spectacularly wrong later."
> 
> From this principle, all of life and physics may be
> deduced.
> 


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