Lab 1: Classical compilation sequence, various useful commands, static vs. dynamic library

1. Classical Compilation Sequence
   • Use your favorite editor, such as emacs or vi, to edit main.c

     int main(void) {
         return (0);
     }
     

   • Compile the main.c into an assembly code, main.s

     $ gcc -S main.c -o main.s
     

   • Compile the assembly code into an object code, main.o

     $ as main.s -o main.o
     

   • Link the object code into an executable, main

     $ ld main.o -o main
     

     The executable should NOT run due to the lack of runtime support!!! Use "gcc -v main.c -o main" to find out how to call ld.

2. Various Useful Commands
   • Compare the assembly code from both main.o and main generated from objdump.

     $ objdump -Sz main.o
     $ objdump -Sz main
     

   • Look at the symbol table from both main.o and main generated from nm.

     $ nm main.o
     $ nm main
     

   • Check the size of both main.o and main.

     $ size main.o main
     

   • Check the shared library dependencies.

     $ ldd main
     

3. Static vs. Shared Library
   • How to build a static (.lib) and a shared (.so) library? See here.
   • Discuss the pros and cons of the static and shared libraries.