everest% cc -c slength.c
everest% cc main4.c slength.o
ld64: WARNING 34: strlen defined in /usr/lib64/mips4/libc.so has different type than strlen defined in main4.o
ld64: WARNING 85: definition of strlen in main4.o preempts that definition in /usr/lib64/mips4/libc.so.
everest% 

everest% a.out
Segmentation fault (core dumped)
everest%