what could cause pragma once in c / cpp file [closed]

  c++

I’m wondering what could go wrong when I will have bigger C / C++ project with multiple modules and I will by mistake type #pragma once into some c / cpp file. Will it just spit warnings at me and ignore the pragma or can it somehow break my project?

EDIT:

This is just teoretical question. There are no more details.

Source: Windows Questions C++

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