-fprofile-generate

[Rajkishore Barik]

Hi,
I made some changes to libgcov.c and gcov-io.h by adding a new function 
named "__gcov_merge_range".
GCC compiles successfully without any error/warning.
However, when I run any sample c program(x.c) using the following command 
"gcc -fprofile-generate x.c", it says 
undefined reference to "__gcov_merge_range" in the linking phase  and it 
does not produce x.gcda file. 
I also tried compiling and linking separately using "-fprofile-generate". 
All the time I get this error.
Can someone help?
regards,
Raj