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It does this by guessing which source files and libraries you need based on the files that you include.
#Simple c makefile example how to#
Makepp can sometimes figure out how to compile programs that are contained in more than one source file, or programs that must be linked with various system libraries. Makepp contains builtin rules for C, C++, and Fortran. If these commands don't make any sense to you, see the makepp_tutorial_compilation manpage. These are the basic commands needed to compile a program on Unix. Warning: on Unix, to run a program called 'test', you must type
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Makepp: Entering directory `/somewhere/or/other' You can just type makepp test and your program will build like this: % makepp test For example, suppose you have a program in a single source file, called test.c. If your program is relatively simple and doesn't require anything particularly special, makepp may already know how to build it without your explicitly giving instructions. However, if your program consists of even just two modules, then you will definitely want to use a program like makepp. If your program consists of a single module, you probably don't need makepp, because you know that any change that you make requires recompiling that module. The examples in this introduction will assume you are building an executable program from source code, but you can do a lot more with makepp than just that if you use your imagination. Makepp will figure out which of the processed data files need to be updated whenever some of the data files or analysis programs change. You could, for example, use makepp to do data analysis, where your input files are raw data and analysis programs, and your output files are processed data or graphs or whatever. You can use a makefile to control any kind of procedure where you need to selectively execute certain commands depending on which files have changed. Usually, the input files are program source code, and the output files are executables, but makepp doesn't care what they are. It relies either on its own builtin knowledge (in very simple cases), or on a file called a Makefile that contains a detailed recipe for building the program. It is an improvement on the make program, a standard tool that has been around for many years. Makepp (short for Make-plus-plus, or make++) is a tool for solving exactly this problem. A reliable automatic tool is necessary for determining exactly which modules need recompilation. Forgetting to recompile a file can mean hours of frustrating debugging. However, it's too error-prone to allow a human to tell the computer which files need to be recompiled. However, a straightforward shell script is seldom used for compiling a program, because it's too time-consuming to recompile all modules when only one of them has changed. The commands are too long to be typed in manually every time.
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Another source of examples and advice on writing makefiles for makepp is the makepp_cookbook manpage.īuilding a program from its source files can be a complicated and time-consuming operation. If you already know a lot about writing makefiles, you might want to at least peruse the later sections of this file because they show the preferred way to do things with makepp, which is often different from the traditional way to do it with make. This is an introduction for writing makefiles that are specific to makepp. Makepp can accept most makefiles written for the standard Unix make, but if you're starting from scratch, it is often much simpler to use some of makepp's advanced features.
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Explicit specifications of alternate directoriesĪ makefile is the set of instructions that you use to tell makepp how to build your program.Source/Object Separation and Variant Builds.