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I'm working an a very large scale projects, where the compilation time is very long. What tools can I use (preferably open source) on Linux, to find the most heavily included files and that optimize their useages? Just to be clearer, I need a tool which will, given the dependencies, show me which headers are the most included. By the way, we do use distributed compiling
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Most standard headers are stored in /usr/include . It looks like stdbool. h is stored somewhere else, and depends on which compiler you are using. For example, g++ stores it in /usr/include/c++/4.7.
To check if an header file has been included or not in a C or C++ code, we need to check if the macro defined in the header file is being defined in the client code. Standard header files like math. h have their own unique macro (like _MATH_H ) which we need to check. Consider this example of checking if math.
Ideally, all header files should be self-contained, and inclusion order should not matter. In practice, people often write header files that are not self-contained, and sometimes inclusion order does matter.
Check out makdepend
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The answers here will give you tools which track #include dependencies. But there's no mention of optimization and such.
Aside: The book "Large Scale C++ Software Design" should help.
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