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There are two possible formats for binary files such as executable programs. The first is the a.out format that is the original format used on Unix systems as well as early Linux systems. The term "a.out" comes from the default name given to an executable file by the Unix C compiler. As shared libraries came into use, difficulties arose with the a.out format. Adapting an a.out format for use as a shared library is a very complex operation. For this reason, a new format was introduced for Unix System 5 release 4 and for Solaris. It is called the Executable and Linking Format (ELF). Its design allowed for the easy implementation of shared libraries. The ELF format has been adopted as the standard format for Linux systems. All binaries generated by the gcc compiler are in ELF format (even though the default name for the executable file is still a.out). Older programs that may still be in the a.out format will still run on a system supporting ELF.
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The gcc utility is also a C++ compiler. It can read and compile any C++ program. However, it will not automatically link with the C++ Class library. You would have to invoke it on the command line. Alternatively, you can use the command g++, which invokes the gcc compiler with the C++ Class library. C++ source code files have a different extension than regular C files. Several different extensions are recognized for C++: C, cc, cxx, or cpp. Other than this difference, you compile C++ programs just as you would C programs. Instead of gcc, it is preferable to use the g++ command. The following example compiles a C++ program, myprog.cpp:
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The gcc compiler also supports Objective-C programs. Objective-C is an object-oriented version of C originally developed for NeXt systems. To compile a program in Objective-C, you use the gcc command with the -lobjc option, which links to the Objective-C library, libobjc.so.
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A great many programming languages are supported on your Linux system. Many are available on your OpenLinux CD-ROM. In addition to C and C++, you can compile Pascal, ADA, Lisp, Basic, and Fortran programs. In several cases, the compiling is handled by the gcc compiler, which is designed to recognize source code files for other programming languages. For example, G77 is the GNU Fortran compiler. This compiler is integrated with the gcc compiler. The command g77 will compile a Fortran program by invoking the gcc compiler with options to recognize Fortran code, using the G77 features of gcc. The ADA 95 compiler is called gnat. The info file on ADA provides detailed information on gnat. You can compile an ADA program using the command gnatmake with the filename.
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There are usually functions used in a C program that rarely need to be compiled and are used repeatedly. There may also be functions that you may want to use in different programs. Often, such functions perform standardized tasks such as database input/output operations or screen manipulation. You can precompile such functions and place them together in a special type of object code file called a library. The functions in such a library file can be combined with a program by the linker. They save you the trouble of having to recompile these functions for each program you develop. Different types of applications make use of specialized libraries that are placed in system directories and made available for use in developing programs. For example, there is a library, libdbm, that contains dbm functions for implementing database access to files. You can use these functions in your own programs by linking to that library. Mathematical applications would use the math library, libm, and X Window applications would use the Xlib library, libX11. All programs make use of the standard C library, libc, that contains functions to perform tasks such as memory management and I/O operations (a new version of the GNU libc library, 2.0, is now available). These libraries are placed within system directories such as /usr/lib, where they can be accessed by anyone on the system. You can also create your own library just for use with your own particular program, or make one that you would want to be accessed by others. Libraries can be either static, shared, or dynamic. A static library is one whose code is incorporated into the program when it is compiled. A shared library, however, has its code loaded for access whenever the program is run. When compiled, such a program simply notes the libraries it needs. Then, when the program is run, that library is loaded and the program can access its functions. A dynamic library is a variation on a shared library. Like a shared library, it can be loaded when the program is run. However, it does not actually load until instructions in the program tell it to. It can also be unloaded as the program runs, and another could be loaded in its place. Shared and dynamic libraries make for much smaller code. Instead of a program including the library as part of its executable file, it only needs a reference to it. Most libraries currently developed are shared libraries. Shared libraries were made feasible by the implementation of the ELF binary format, though there is an older a.out format for shared (tagged) libraries. ELF is currently the standard format used for all binary files in Linux. The GNU libraries are made available under a Library GNU Public License (LGPL). The conditions of this license differ from the standard GNU license in that you are free to charge for programs developed using these libraries. However, you do have to make available the source code for those libraries you used. Libraries made available on your system reside in the /usr/lib and /lib directories. The names of these libraries always begin with the prefix lib followed by the library name and a suffix. The suffix differs, depending on whether it is a static or shared library. A shared library has the suffix .so followed by major and minor version numbers. A static library simply has a .a extension. A further distinction is made for shared libraries in the old a.out format. These have the extension .sa.
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