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An application is an executable program created by a programmer using one of several programming languages. Linux provides several utilities with which a programmer can control development of an application. Foremost among these is the gcc utility, which invokes the compiler for the C and C++ programming languages, generating an executable version of a program. Most Linux applications are written in the C or C++ programming language. Application development often makes extensive use of libraries. You can create your own libraries or choose from specialized libraries. You can use libraries such as the X Windows library to program X Window displays, or the gdbm library, with which you can have
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database access to files. Libraries have become more flexible and can now be shared or loaded dynamically. Other utilities allow you to better manage the development of your applications. The gdb symbolic debuggers help you to locate runtime errors. indent and cproto help you prepare your source code. Autoconf and RPM help you package your software for distribution. Version control systems such as RCS and CVS help you maintain a record of changes as you develop a software application. Table 1 lists the development tools described in this chapter. Table 1: Programming: Tools Description GNU C and C++ compiler, www.gnu.org/software/gcc GNU debugger, www.gnu.org/software/gdb Revision Control System, www.gnu.org/software/rcs Control Versions System, www.cvshome.org Online manual documentation Automatic configuration for source code software compiling, www.gnu.org/software/autoconf
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Though there are Man pages for all the compilers and their tools, much more detailed information is available through the GNU info system. These are files located in the /usr/info directory that contain detailed descriptions and examples for various GNU tools. They are the equivalent of compact online manuals. There are info documents for the gcc compiler, the C and C++ libraries, and the Autoconf utility. Other applications may have their own local directories with info files such as the /usr/TeX/info directory that holds info files for LaTeX. You invoke the main menu of info documents by entering the command info.
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$ info
You then use the SPACEBAR to page down the menu. When you find a topic you want, you press the m key. This opens up a line at the bottom of the screen where you can type in the name of the menu item. When you press ENTER, that document comes up. Pressing b pages you back to the beginning, and U puts you up to the previous menu. The command info info will bring up a tutorial on how to use info.
The C Compiler: gcc
There is a special relationship between the Unix operating system and the C programming language. The C programming language was developed specifically as a tool for programming the Unix operating system. The code for the Unix operating system is actually written in C. Linux has the same kind of special relationship. Most Linux systems include the GNU version of the C compiler, gcc. The C programming language is a very complex language with many different features. This section briefly describes the basic components of the C programming language and uses them to construct a useful programming example. With an example program, we can then examine the different ways you can compile C programs.
Note Instead of using the command line interface to compile applications, you can use an integrated development environment (IDE) with a Gnome or KDE interface to compile and edit application source files. On Gnome you can use gbuilder, Anjuta, and Titano. On KDE, you can use Gideon, KDevelop, and KDEStudio. You invoke the GNU C compiler on your Linux system with the gcc command. The gcc command, in turn, calls four other components. The first is the preprocessor. A C program contains special preprocessor commands that modify the code before it is sent to the compiler. The second component is the compiler itself. The compiler will process the code and generate an assembly code version of the program. The third component is the assembler. The assembler will use the assembly code version of the program to generate an object code version. The fourth component is the linker. The linker uses the program's object code to generate an executable file. The default name of this executable file is a.out. Normally, you should give the executable file a name of your own choosing. The -o option takes a filename as its argument. This filename will be the name of the executable file instead of the default, a.out. A list of gcc options is provided in Table 2. In the next example, the gcc command compiles the program greet.c. The user names the executable file "greet". The executable file is run by entering it at the Linux prompt as if it were a command.
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