On 2011-09-26, Bustamante, Paul <[email protected]> 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.
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