mac(tchrist)% cat > empty.c
/*
* See no weevil.
*/
mac(tchrist)% cc empty.c
Undefined symbols for architecture x86_64:
"_main", referenced from:
implicit entry/start for main executable
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
Exit 1