Hello,
I'm using -ffunction-sections and -fdata-sections, with --gc-sections on
linking, but the output size doesn't change (I have some functions not
being used right now)
Do I have to do something else to achieve this optimization?
Best regards,
On Mon, Sep 26, 2011 at 12:05 PM, Grant Edwards
<grant.b.edwa...@gmail.com>wrote:
> On 2011-09-26, Bustamante, Paul <pbustama...@ceit.es> wrote:
>
> > When I have a 10 functions in a file "funcs.c", and I only use one of
> > them, when I link to the main program (main.c), all the functions in
> > the file "funcs.c" are included in the ".elf" file.
> >
> > How I can link that only the functions that I use will be included in
> > the ".elf" file?
>
> Compile with the -ffunction-sections option (you may also want the
> -fdata-sections option), then link with the --gc-sections option.
>
> The -ffunction-sections option will place each function in a separate
> memory section (-fdata-sections does the same thing for variables).
>
> The --gc-sections linker option will discard any sections that are not
> referenced.
>
> IIRC, there have been a couple recent versions where support for those
> features was broken, but I think it's all fixed now.
>
> --
> Grant Edwards grant.b.edwards Yow! I want EARS! I
> want
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>
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