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makefile
Makefile(s) are text files written in a certain prescribed syntax. Together with Make Utility, it helps build a software from its source files, a way to organize code, and its compilation and linking.
==Overview==
Most often, the Makefile tells make how to compile and link a program. Using C/C++ as an example, when a C/C++ source file is changed, it must be recompiled. If a header file has changed, each C/C++ source file that includes the header file must be recompiled to be safe. Each compilation produces an object file corresponding to the source file. Finally, if any source file has been recompiled, all the object files, whether newly made or saved from previous compilations, must be linked together to produce the new executable program. These instructions with their dependencies are specified in a Makefile. If none of the files that are prerequisites have been changed since the last time the program was compiled, no actions take place. For large software projects, using Makefiles can substantially reduce build times if only a few source files have changed.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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