Red Hat ENTERPRISE LINUX 3 - DEVELOPER TOOLS GUIDE Bedienungsanleitung PDF herunterladen (Seite 17)

Chapter 3.

Developing with Red Hat Enterprise Linux

Developer Tools

Use the tutorials in this chapter to learn about standard native development with the tools.

See http://www.redhat.com/docs/manuals/gnupro/ for details about the tools.

3.1. Create Source Code

To start, create the following sample source code ﬁle and save it as hello.c. The following sections

show you how to compile this ﬁle to form an executable and how to run it.

#include <stdio.h>

int a, c;

static void

foo (int b)

{

c = a + b;

printf ("%d + %d = %d\n", a, b, c);

}

int

main (void)

{

int b;

a = 3;

b = 4;

printf ("Hello, world!\n");

foo (b);

return 0;

}

Example 3-1. Source code to save as hello.c

3.2. Compile, Assemble, and Link from Source Code

To compile the code, use the following command:

gcc -g hello.c -o hello

The -g option generates debugging information and -o speciﬁes the name of the executable to be pro-

duced. Both of these can be omitted. Other useful options include -O to enable standard optimizations

and -O2 for extensive optimizations. If no -O is speciﬁed, GCC will not optimize.

See Using the GNU Compiler Collection (GCC) for additional basic compiler information.

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Red Hat ENTERPRISE LINUX 3 - DEVELOPER TOOLS GUIDE Bedienungsanleitung Seite 17