For PS3 development it seems that the devs were forced to use a fork of GCC made to support the notorious Cell architecture (some info from here: https://www.co

For PS3 development it seems that the devs were forced to use a fork of GCC made to support the notorious Cell architecture (some info from here: https://www.copetti.org/writings/consoles/playstation-3/ https://www.copetti.org/writings/consoles/playstation-3/). Not sure about the NDA details but I would believe contributing to the compiler would have been difficult (and would have not really landed in the GCC trunk anyway). For PS4 and later Sony used an LLVM fork for their toolchain, so now they don't even have the obligation to share their compiler code. Maybe some improvements to LLVM will "naturally" go back to the devkit, but it's not really a good situation for open-source contribution. Not sure how it went for the XBox lineups though (Probably it used MSVC, since it's from Microsoft?). Since console development is mired up in NDAs there's not that much public info about it.