963  cd linker_demo
# build hello.c with static linking of standard library
  964  vim Makefile 
  963  make static_hello
  968  nm static_hello
# build hello.c with dynamic linking of standard library (default)
  970  make dynamic_hello
# the executable with statically linked standard library has far more symbols. 
# For example, it contains the printf definition (and helper function definitions)
  974  nm static_hello | wc -l
  972  nm dynamic_hello | wc -l
  977  ls -l *_hello

  978  cd ..
  979  cd archive_demo
 1141  ls
 1143  vim Makefile 
# run the archive tool (ar) to wrap up speak.o and shout.o into
# one .a, or "library", or "archive"
 1144  make libvoices.a
# link to the libvoices.a instead of speak.o and shout.o
 1145  make talk
 1146  ./talk
# The gnu linker processes .o's and archives left to right 
# so if you use the wrong order then you will still get
# "undefined reference to speak/shout" errors (see 21-linking-more.pdf slide 5-6)
 1147  make talk-wrong-order
 1135  history >lec21.history