Figure 1: Output from running gcov.

(a)
gcov -o file_io/unix/.libs/ file_io/unix/copy.c
68.18% of 44 lines executed in file file_io/unix/copy.c
Creating copy.c.gcov.

(b)
gcov -f -o file_io/unix/.libs file_io/unix/copy.c
65.00% of 40 lines executed in function apr_file_transfer_contents
100.00% of 2 lines executed in function apr_file_copy
100.00% of 2 lines executed in function apr_file_append
68.18% of 44 lines executed in file file_io/unix/copy.c
Creating copy.c.gcov.