If you are trying to compile the software with a new compiler, then you are changing the environment. And then it's expected that you may need to change things.

If you are trying to compile the software with a new compiler, then you are changing the environment. And then it's expected that you may need to change things. Software has the most complex interfaces between parts, and it's nearly impossible to even verify that you haven't changed an essential part of of the contract. Of course this also hints at how we may build more reliable and resilient software in the future...