Question

I was wondering if there was a tool (maybe GNU C++ compiler) to obtain from a .cpp file
full of functions a .hpp file with the mentioned functions declarations.

Example:

I have:
magic.cpp

int foo() { return 42; }
char bar() { return 'z'; }

And I would like to obtain this after applying the wonderful tool:
magic.hpp

int foo();
char bar();

Answer 1

Please see Dehydra or Treehydra. One of these two tools should allow you perform this via GCC.

Dehydra is a lightweight, scriptable, general purpose static analysis
tool capable of application-specific analyses of C++ code.