[Q] linking only some functions in an object file
Nick Clifton
nickc@cambridge.redhat.com
Wed Apr 18 23:50:00 GMT 2001
Hi jw,
> For example, when I link test.o test2.o and make
> test.elf, all of functions in test.o test2.o gets in
> test.elf.
>
> But I don't want not-used-functions to get in
> test.elf. How can I do this?
Another possible solution, if you are using gcc, is to use the command
line switch -ffunction-sections. This places each function compiled by
gcc into its own, individually named section. Then when you link
together the object files, add the linker command line switch
--gc-sections. This will cause the linker to throw away all sections
that it finds are not needed, which I believe is what you want.
Please note the support for -ffunction-sections is not present in all
gcc targets, so you may not be able to use this method.
Cheers
Nick
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