==============================
Using the GNU C-Compiler (GCC)
==============================

Compiling and running a first C program
=======================================
:import: session03/factorial.c

Compile (read but ignore the warning for the moment) and run the program with

---- SHELL(path=session03) ----------------------
gcc -Wall -std=c99 -o factorial factorial.c
factorial
-------------------------------------------------

Examine the generated assembly code
===================================
Check out the generated assembly code with

---- SHELL(path=session03,hostname=heim) ----------------------
gcc -Wall -std=c99 -S -fomit-frame-pointer -fno-asynchronous-unwind-tables factorial.c
-------------------------------------------------

Note that the parameters `-fomit-frame-pointer` and `-no-fasynchronous-unwind-tables`
are just used here for the sake of simplicity.   The assembly code generated is stored
in file `factorial.s`:

---- SHELL(path=session03) ----------------------
cat factorial.s
-------------------------------------------------

Examine the result of the C Preprocessor (CPP)
==============================================
Check the output of the CPP for the C program

:import: session03/factorial2.c

Use the option `-E` so that `gcc` just calls the CPP and then stops (so any other
options for `gcc` can be omitted):

---- SHELL(path=session03) ----------------------
gcc -E factorial2.c
-------------------------------------------------

Getting rid of the warning
==========================
- First check the result of CPP (just to see once what the `#include` does)
- Compile and run the program with `gcc -Wall -std=c99 -o factorial3 factorial3.c`
- Compile and run the program with `gcc -DN=10 -Wall -std=c99 -o factorial3 factorial3.c`

:import: session03/factorial3.c


Types `size_t` and `ptrdiff_t`
==============================

- Compile and run

  :import: session03/factorial4.c

- Complete the following code

  :import: session03/globalvars.c

- Change the previous code such that variables `a`, ..., `f` are now local
  variables.  Compile and run the code.


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