Good design sense places the code for these structures in separate files, say vector.c/h and list.c/h. For example, some program you're working on might make use of a vector and a linked-list that you've implemented, neither of which makes any reference to the other in its implementation. This allows separating the components of a project which can be built independently.
The makefile itself contains the "recipe" information that specifies the steps required to build a given target, including what dependencies it has, what subproducts must be built in what sequence, what flags to pass to their various tools, and so on.Ī makefile with a proper dependency graph will only rebuild a target when one or more of the components it depends on has changed. The special target make clean will remove any previously built products and let you start fresh. You can also name just the specific target you want to build, such as make reassemble or make myprogram. The command make invokes the make program which reads in the file Makefile from the current directory and executes the build commands necessary to build the default target. Managing the build with a makefile is much more convenient and less error-prone and far simpler after a one-time setup cost. However, manually re-typing these compilation commands quickly becomes tedious as projects get even slightly complex, and it is easy to mistype or be inconsistent. You could add flags such as -Wall (for warnings) or -std=c99 (to use the updated C99 specification), or -o to set the name of the resulting executable. gcc file1.c file2.c file3.c compiles three files and links them together into an executable named a.out. How/why to use a makefileįor simple projects with uncomplicated settings, you can build without a makefile by directly invoking the compiler, e.g. A well-written makefile describes all the files and settings used to compile a project and link it with the appropriate libraries, and makes compilation trivial from the command line. The Unix programmer, on the other hand, keeps things clean, storing a lightweight and easily-modified text file (with an admittedly disjointed and convoluted syntax) directly in the project directory.
#HOW TO WRITE MAKEFILE FOR C PROGRAM SERIES#
Programming IDEs like Visual Studio store obscure configuration files based on selections in a series of disjointed and convoluted settings menus. Makefiles are the Unix programmer's way of managing the build process for a project.
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