The Quick and Dirty "Hello World" with GCC

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by Martin Iturbide

I just wanted to check out which will be the most basic example to use the gcc compiler to create on OS/2-eCS the most basic, most easy program on earth, the "Hello World" program.

Preparing the Development Enviroment

First I installed with Noae Package Manager the gcc compiler listed as "gcc".

Gcc-ANPM.png

I also followed the advice on how to install the development environment from the VBOX porting project [1]. It list to install the following:

yum install ash which kbuild gcc gcc-wlink gettext-devel pthread-devel libxml2-devel libxslt-devel 
openssl-devel libcurl-devel zlib-devel libpng-devel libqt4-devel libidl-devel libvncserver-devel 
nasm libpoll-devel libaio-devel 

So I installed all that packages. They are not all required for this example, but since I'm starting with this, it is good enough for me.

Coding the Program

I created a simple text file called "hello.c" and included on it.

/* Hello World program */

#include<stdio.h>

main()
{
    printf("Hello World");
}

The most simple program on C to print out "Hello World" on the command prompt.

Compiling the Program

To compile it is as simple as:

gcc -o hello.exe hello.c

The -o file parameter of gcc it is just to place the output of the compile into an specific file name.

It will generate a "hello.exe" file.

Testing the Program

When you run it you will see:

Hellocmd.png

Let's also check out with PMDLL which DLLs are associated to this newly created hello.exe program.

HelloC-PMDLL.png

This means that for this program to work it requires that LIBC066.DLL and GCC1.DLL must be installed (on the LIBPATH) of the OS/2-eCS machine where you are running this program.

It can not be more simple.