Defining Macros/Variables in the makefile: Running command make is easier than writing complete gcc command every time for compilation. If you make any changes in programming files, you have to run command make which will give hellomake as output executable file. In the second line, the tab is used to identify the scope.The file name mentioned after :, defines the order of compilation.hellomake is the output binary or executable file.When you run the command make in the same directory where the makefile is located, it compiles the file in the same order mentioned in the makefile rule. Gcc -o hellomake hellomake.c hellofunc.c -I.
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How to Create and Run Simple makefile? hellomake: hellomake.c hellofunc.c In the makefile, you can mention all your files that need to compile.īy considering our above example, here is simple makefile that you can create and try running. There are many advantages of the makefile. Do you want to write this command again with hundreds of files? Obviously not! If you switch to another computer or terminal, you can not just run the previous command by pressing up and down button on the terminal. If you can do this, this tutorial is not for you. In above command, there are only two files, what if there are hundreds of files need to compile?ĭo you think is it comfortable to write this gcc compilation command by mentioning all these 100’s file names? There are certain problems with this commands. : Indicates that all the input files need to compile presents in the current directory. -o : This is a parameter to name your output the binary/executable file.gcc -o hellomake hellomake.c hellofunc.c -I.
Run this following command in the compiler. If you are using gcc compiler, you have a straightforward run command to compile C program. So, you need to compile hellomake.c before hellofunc.c. Here, hellofunc.c depends on hellofunc.c. And function printHelloMake() is used in hellomake.c file. This is header file hellomake.h which contents the printHelloMake() function declaration. The function printHelloMake() is defined in hellofunc.c file.
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In other words, the makefile is used to organize the code compilation procedure.įor many, it sounds difficult to understand, let see the example where you need to follow the order of compilation. For example, one source file must be compiled before other one and likewise…īasically, the makefile is used to order the sequence of a compilation of files. All these different files have dependencies. The project usually have different files to compile and to make the executable binaries. Makefile, you may have seen in many projects.
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