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As you develop and debug your program, you will be making changes to source code files and then recompiling your program to see how it runs. If you have a very large program made up of many source code files, it would be very inefficient to recompile all of them if you only made changes to just a few of them. Those to which you made no changes do not need to be recompiled, just linked. You can direct the gcc utility to do just that, by mixing source code files and object code files as arguments on the command line. Source code files have a .c extension, and object code files have a .o extension. gcc will compile the source code files you specified on the command line, but will only use the object code files with the linker. This has the advantage of being able to compile only those files where changes have been made. If changes were made in main.c, but not in io.c, io.c would not have to be compiled. You would then specify the source code file main.c and the object code file io.o on the command line. In the next example, io.o will not be compiled, whereas main.c will be compiled:

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.

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:

' {$STAMP BS2} ' {$PBASIC 2.5} '~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ '========== assign pins ReceivePin PIN 0 SendPin PIN 1 '==================Declare necessary variable SENSORS VAR Nib Direction VAR Byte T VAR Byte bData VAR Byte(2) 'Received data buffer from RobotBASIC 'byte 0 is the command code and byte 1 'is a parameter for the command. bBuffer VAR Byte(5) 'Buffer of data to be sent to RobotBASIC 'byte 0 is the bumper sensor. Byte 1 is the 'infrared sensors. Byte 2 is the line sensors. 'Byte 3 and 4 is a 16 bit integer for the data 'to be returnd as the result of some commands. 'Byte 3 is the MSB, byte 4 is the LSB. 'See RobotBASIC help for more details. '============================================================= '============================================================= Main: PAUSE 1000 'WAIT FOR the eb500 radio TO be ready DO SERIN ReceivePin,84,[STR bData\2] 'receive command and its 'parameter from RobotBASIC IF bData(0) = 3 THEN GOSUB rLocate ELSEIF bData(0) = 6 THEN Direction = 1 GOSUB rForward ELSEIF bData(0) = 7 THEN Direction = 0 GOSUB rForward ELSEIF bData(0) = 12 THEN Direction = 1 GOSUB rTurn ELSEIF bData(0) = 13 THEN Direction = 0 GOSUB rTurn ELSEIF bData(0) = 24 THEN GOSUB rCompass ELSEIF bData(0) = 48 THEN Direction = 1 GOSUB rLook ELSEIF bData(0) = 49 THEN Direction = 0 GOSUB rLook ELSEIF bData(0) = 96 THEN GOSUB rBeacon ELSEIF bData(0) = 192 THEN Direction = 1 GOSUB rRange ELSEIF bData(0) = 193 THEN Direction = 0 GOSUB rRange ELSEIF bData(0) = 129 THEN GOSUB rPen

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.