c preprocessor - How to process C++ file to remove ifdef'd out code -


i have inherited piece of c++ code has many #ifdef branches adjust behaviour depending on platform (#ifdef __win32, #ifdef __apple__, etc.). code unreadable in current form because these preprocessor directives nested, occur in middle of functions , in middle of multi-line statements.

i'm looking way of somehow specifying preprocessor tags , getting out copy of code if code had been pre-processed flags. i'd headers left untouched, though. example:

#include <iostream>  #ifdef __apple__ std::cout << "this apple!" << std::endl; #elif __win32 std::cout << "this windows" << std::endl; #endif

would turn into:

#include <iostream>  std::cout << "this apple!" << std::endl;

after being processed by: tool_i_want example.cpp __apple__.

i've hacked quick script similar, i'd know of better tested , more thorough tools. running linux distribution.

i have decided against running c-preprocessor because if i'm not mistaken expand header files, make more unreadable.

use unifdef. designed purpose.


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