/* This file is part of the sample code and exercises
 * used by the class "Advanced Programming in the UNIX
 * Environment" taught by Jan Schaumann
 * <jschauma@netmeister.org> at Stevens Institute of
 * Technology.
 *
 * This file is in the public domain.
 *
 * You don't have to, but if you feel like
 * acknowledging where you got this code, you may
 * reference me by name, email address, or point
 * people to the course website:
 * https://stevens.netmeister.org/631/
 */

/* A very simple program to illustrate the different stages in the
 * compilation process.  First, use cpp(1) to pre-process the file; repeat
 * with FOOD defined to a different value.  Compare output, illustrate
 * that code is pulled in by the preprocessor and macros expanded.  Then,
 * compile hello.i to hello.s and show the resulting assembly output
 * before using as(1) to generate object code.  Use objdump(1) (or
 * similar) to disassemble the object code.  Finally, use ld(1) to create
 * an executable.
 *
 * To illustrate compiler optimization, compile with
 * '-O0 -S' and once with '-O4 -S' and compare the
 * output.  You should notice that the calls to func1
 * and func2 are eliminated when optimization is
 * turned on.
 *
 * The file 'dump' includes the traced output of the compiler invocation.
 * Show the different stages again.
 */
#include <stdio.h>

#ifndef FOOD
#define FOOD "Avocado"
#endif

void
func2(void) {
	printf("%s: great on anything.\n", FOOD);
}

void
func1(void) {
	func2();
}

int
main() {
	func1();
	return 0;
}