[pjmlp]

What file formats? Text?

That is meaningless if they don't support the same language features, which is why other than Google's inhouse Android Linux fork, the Linux kernel is hardly compilable with anything else other than GCC C dialect.

GNU/GCC might have enabled and unleashed a movement, but thanks to the mass adoption of non-copyleft licenses, its time has come to pass, and in a couple of generations we will be back to shareware and public domain software packages.