That is if you know about this issue. Very few people do. At some point C23 may become a default version of C in some compilers and someone who has been buildin

That is if you know about this issue. Very few people do. At some point C23 may become a default version of C in some compilers and someone who has been building code without specifying what version of C they use, will silently get a bug. That is the problem. There is no way for a C compiler to look at the code and determine what version it was written for.