View source for The Quick and Dirty "Hello World" with GCC

by [[User:Martini|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 [http://www.os2world.com/wiki/index.php/Arca_Noae_Package_Manager|Arca Noae Package Manager] the gcc compiler listed as "gcc". 

[[Image:gcc-ANPM.png|400px]]

I also followed the advice on how to install the development environment from the VBOX porting project [http://trac.netlabs.org/vbox]. 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 this 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:

[[image:Hellocmd.png|300px]]

Let's also check out with [http://www.os2world.com/wiki/index.php/PMDLL PMDLL] which DLLs are associated to this newly created hello.exe program.

[[Image:HelloC-PMDLL.png|500px]]

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.

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