Linking un-referenced function

[John Carter]

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
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