1144  cd linker_demo
# we looked at the hello.c file to see its definitions (main, messages, hello) and its external references (printf)
 1145  vim hello.c 

# our makefile has targets for viewing the symbols of an object file
 1146  vim Makefile 
 1147  make hello.o
 1148  make symbols-o    # NOTE: this was called "view-symbols" during lecture
# T means a code definition; D means a global variable definition; U means a unresolved reference (i.e., something the linker must fix up for us)

# lets run the linker to produce hello (we force gcc to statically link everything, including the standard library)
 1152  make static_hello
# Notice that the executable static_hello includes the printf definition (and helper functions)
 1153  make symbols-static  | grep printf

 1156  history > lec20.history