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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 make utility. The make utility interfaces with the Linux operating system to provide an easy way to maintain and compile programs. The RCS utility allows you to better control program changes. It organizes changes into different versions that can be stored and later accessed. You can even use the man utility to create your own online documentation for your applications. All of these utilities are complex and powerful tools.
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You will often be working with a program that has many source code files. As you develop the program, making modifications, you will need to compile the program over and over again. However, you need only compile those source code files in which you made changes. The linker then links the newly generated object code files with previously compiled object code files, creating a new executable file. The fact that only a few of your source files are actually compiled drastically cuts down on the work of the compiler. Each time you need a new executable program, you do not need to recompile each source code file. It can be very difficult in large programs with many source code files to keep track of which files have been changed and need to be compiled and which files need only to be linked. The make utility will do this for you. make was designed for a development environment in which different source code files in a program are constantly being modified. make keeps track of which source files have been changed and which have not. It then recompiles only those that have been changed, linking them with the rest of the object code files to create a new executable file. In the next example, the user enters the command make on the command line to invoke the make utility. make then compiles those files that have recently been modified and creates a new executable file. make displays each Linux command it executes.
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$ make gcc -c main.c gcc -c io.c gcc main.o io.o
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To understand how the make utility works, you need to realize that it uses a source code file's time stamp to determine whether or not it should be compiled. Whenever a file is created, recreated, or modified in any way, a new time stamp is placed on it by the Linux operating system. If you create a file at 1:00, that file is stamped with the time 1:00. If you then change the file at 6:00, the file is restamped with the time 6:00. When you are compiling a program, only those source code files that have been changed need to be recompiled. Since a change in any file changes the time stamp, the time stamp can be used to determine which files need to be compiled. In this way, make knows which files need to be compiled and actually selects the files to be compiled for the programmer. A dependency line specifies a dependency relationship between files. make operates in terms of dependencies. A source code file is used to create an object code file, which in turn is used to create a runnable program. The program can be said to be dependent on the object code file, which in turn is dependent on the source code file. You need to specify the dependency relationship between a source code file and an object code file in a dependency line. In
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another dependency line, you need to specify the dependency relationship between an executable file and all its object code files. A dependency line can be thought of as a kind of conditional statement. The dependency relationship is its test condition. If an object code file depends on a source code file and the source code file has been recently modified, then the test condition is true and the file is then recompiled. However, the syntax for a dependency line is a bit more complex than a standard conditional statement. A dependency line consists of three components: a target file, a list of dependency files, and a Linux command. If any of the dependency files have been modified more recently than the target file, the Linux command is executed. The target file and the dependent files are written on the same line, separated by a colon. You can either place the Linux command on the same line, separated from the dependent files by a semicolon, or you can place the Linux command on the next line preceded by a tab. You can list more than one Linux command if you wish. When entering Linux commands on the same line, you separate them with semicolons. Entered on a separate line, each Linux command has to be preceded by a tab. The dependency line ends with a following empty line. In these examples, the Linux command is an invocation of the gcc compiler, compiling a source code file or linking object code files. The syntax for a dependency line is as follows:
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target file : dependent files ; Linux command empty line target file : dependent files tab Linux command empty line
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In the following Makefile, we construct the dependency lines for a C program consisting of two source code files: main.c and io.c. In such a two-file program, there are really five files to manage. For each .c file there is a corresponding .o file. There is the executable file, a.out. You need to set up your Makefile with dependency lines to manage all of these files, specifying dependencies for each. An object code file (.o) is dependent on a source code (.c) file. An executable file, a.out, is dependent on several object code files (.o). In the example, a.out is dependent on (made up of) the two object code files main.o and io.o. Each object code file is, in turn, dependent on its respective source code files: main.o on main.c, and io.o on io.c. In the Makefile, three dependency lines are needed for the a.out, main.o, and io.o files, respectively. Notice that the linking and compilation of the program are split up among the different dependency lines. The Linux command for the a.out target only links the two object code files, creating a new executable file. It invokes gcc with only object code files (.o), causing only the linker to be invoked. The Linux commands for the main.o and io.o targets only compile, creating .o object files. The -c option used with gcc means that no linking is done, only compilation, generating the object code file for this source code file. makefile
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