Is there a easy way to use the -finstrument-functions option?

[renjunqu]

Hello everyone:
          I want use gcc's "-finstrument-functions" option to hack a
open-source project. But if i want to make the most use of this option, i
should tell the compiler the my own definition of "__cyg_profile_func_enter"
and "__cyg_profile_func_exit" functions. If the project i want to hack will
create many different 'elf' files,and different 'elf' use different source
files,so i have to define the two function in many many files.
          Is there some easy ways to tell the compiler my function's
definition???
                                                                                                 
Ren jun qu  
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