Feedback_file

(Project Properties window)

*.prj\BUILD\Link Advanced\
Feedback_file

Specifies the name of the file to be used by the linker to list any unused functions. If the file does not exist, the linker creates it. The compiler uses this file to remove the unused functions and so it must also be specified in the COMPILE/Optimization group of settings.

For more information, see –-feedback in the documentation for your toolchain.