> the whole codebase
You can't goto out of a function, and you know there's exactly one such label inside it. If goto isn't local, then neither are function calls, since the function could be defined anywhere in the codebase.
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>You can't goto out of a function
You can with a goto expression and a label address available - though the behavior is undefined in C, so bets are off.
And you can with longjump/setjump more explicitly.
Are you talking about this? https://gcc.gnu.org/onlinedocs/gcc/Labels-as-Values.html It's a GNU extension, not part of standard C at all.