OK - assuming you're referring to 'char ptr[static 15]' as the 'static trick', then yeah - other compilers do not complain.

However the other form 'char (*arr)[15]' has always been available, and is complained of in other compilers.

I believe I remember using it in DOS based C-89 compilers back in the early 90s, possibly also in K&R (via lint) in the 80s.

NB: icc, msvc, mvc complain about the misuse of the traditional version if one adjusts your godbolt example.

Yes one has to build with warnings forcing errors, which takes a bit of work to achieve if the code has previously been built without that.

There isn't really much difference between "ignoring warnings" in C and careless use of "unsafe" or "unwrap" in Rust. Once you entered the realm of sloppiness, the programming language will not safe you.

The point is to what extend the tools for safe programming are available. C certainly has gaps, but not having proper arrays is not one of them.