You can compile with -Wvla to warn about such usage.
-Wvla
The problem with that, at least with gcc, is that it also warns about VLA function parameters which are safe.
Another array related item that was officially standardised in C99 is the Flexible Array Member.
Oops! I forgot about them. I'm pretty sure I've never written any C program that used them. Anyway, I've added a section describing them.
You can compile with -Wvla to warn about such usage. The problem with that, at least with gcc, is that it also warns about VLA function parameters which are safe.
Clang warns also. Whenever I've used multi-dimensional arrays (not that often) I've made them arrays of pointers.
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The problem with that, at least with gcc, is that it also warns about VLA function parameters which are safe.
Oops! I forgot about them. I'm pretty sure I've never written any C program that used them. Anyway, I've added a section describing them.
Clang warns also. Whenever I've used multi-dimensional arrays (not that often) I've made them arrays of pointers.